20
S-SERIES Combustion Switches
Features:• Set point repeatability, +1% of operating range.• UL Listed in the gas and oil equipment list.• FM Approved as “pressure supervisory switches.”• Externally visible pressure setting scales.• External adjusting nuts.• Choice of fixed or full-range adjustable deadbands.• Choice of single or two-stage units.• Mounts in any position.• Rugged and vibration resistant.• Separate electrical, pressure and adjusting
chambers.• Mix and match switch and transducer components for
increased stock flexibility or to change pressure ranges in field.
• Withstands high surge pressures.
General Description:ASCO S-Series combustion switches consist of aswitch unit and a transducer unit. They can be orderedseparately for customer stocking and/or field assemblyor as a complete factory-assembled unit.
SwitchS-Series combustion switch units incorporate theunique ASCO TRI-POINT alternating fulcrum balanceplate to control the operation of one or more electricalsnap-action swtiches. The electrical snap-action switchtogether with the adjusting mechanism is a fully-tested,self-contained subassembly.
TransducerTransducer unit incorporates a diaphragm/piston type pressure sensor, and is also a fully-tested, self-contained subassembly.
OperationWhen pressure is applied to the transducer it is converted into movement of the piston. This pistonmovement is then used to control the operation of the electrical snap-action switch in the switch unit.
Options (See pages 34-35)
Dimensions (See page 15)
Standard Electrical Ratings
Standard Temperature Ratings
Pressure Switches Designed to UL or FM Requirementsfor Combustion Service
SA, SD and SE Series5 Amp Res., 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp Res., 125 VDC1/4 Amp Res., 250 VDC
SB and SC Series5 Amp Res., 125, 250 VAC1/4 HP, 125 VAC1/2 HP, 250 VAC.4 Amp Res., 125, VDC
Ambient: -4°F (-20°C) to 140°F (60°C)Fluid: For Buna “N” or Neoprene Diaphragm
-4°F (-20°C) to 180°F (82°C)For Viton Diaphragm-4°F (-20°C) to 250°F (121°C)For 316 SS Diaphragm-50°F (-45°C) to 300°F (149°C)
SD and SE Series not FM Approved.1
^ #
1
SPDTNO
NC
C
4 123
UL RequirementsUnderwriters’ Laboratories, Inc.’s Standard UL 353defines construction and performance requirements forlimit controls.
SwitchS-Series combustion switch units when mated to thepressure transducers described below form pressureswitches in accordance with UL requirements.
TransducersFuel Gas – UL requires a pressure transducer with asecondary chamber. This chamber allows the gas to be vented to a safe location in the event of primary sensing element rupture. The “double chamber” withvent pressure transducers meet this requirement.
Fuel Oil – UL requirements for fuel oil applications waive the double chamber requirement, providing thesensing element is made of Type 316 or 321 SS. S-Series type 316 SS pressure transducers aredesigned to meet this requirement.
General Service – Pressure transducers for water,steam and air service may be of the single chamberdesign.
EnclosuresASCO TRI-POINT S-Series switches are available inthree standard enclosures. All of these enclosed unitsare made in accordance with NEMA and UL standards.
General Purpose – Type 1. These enclosures aredesigned for indoor use to protect personnel fromaccidental contact with the equipment. S-Series general purpose switch units consist of a copper-free*aluminum die-cast body with a formed copper-free* aluminum cover; two 3/4” conduit hubs with one plugare provided.
Watertight – Type 4. Watertight and dust-tight enclo-sures are intended for use indoors and outdoors to protect the enclosed equipment against splashing orfalling water, windblown dust and water, hose directedwater, and severe external condensation. S-Serieswatertight switch units have a copper-free* aluminumdie-cast body and a formed copper-free* aluminumcover with Buna “N” gaskets; two 3/4” conduit hubs with one plug are provided.
Explosion-Proof – Types 7 and 9. Type 7 enclosuresare intended for use in locations defined by the NationalElectrical Code as Class I. Type 9 enclosures areintended for Class II locations.
Class I locations are those in which flammable gasesare or may be present in the air in sufficient quantitiesto produce explosive or ignitable mixtures. Class Ilocations are classified by group letter, which definesparticular atmospheres. Division 1 locations are areaswhere the hazardous concentration exists continuously,intermittently or periodically under normal operatingconditions. Division 2 locations are those where thehazardous vapors are present only in case of acciden-tal rupture or breakdown of equipment.
ASCO TRI-POINT explosion-proof enclosures with letter B, C or D in the fifth position are listed for Class I,Groups B, C, and D, Division 1. They are also suitablefor the less stringent Division 2 environment.
Class II locations are those which are hazardousbecause of the presence of combustible dust. All ASCO TRI-POINT explosion-proof enclosures are listed for Groups E, F, and G locations.
The switch body and cover are die-cast copper-free*aluminum with a Buna “N” gasket. Two 3/4” conduithubs with one plug are provided.
FM RequirementsFuel Gas and Fuel Oil – FM requires that fuel gas and fuel oil pressure supervisory switches shall have avisible external means of determining switch position.No specific constructions are required for the pressuretransducer. Switch units with visual position indication(suffix “V”) in conjunction with single chamber pressuretransducers will meet these requirements.
General Service – Standard switch units with an adjusting nut cover, when mated to single chambertransducers, meet FM requirements for general applications such as “airflow interlocking switches”.
EnclosuresGeneral Purpose – Designed to Type 1 specificationsfor indoor applications. Die casting is copper-free* aluminum; covers are polycarbonate. Two 3/4” conduithubs with one plug are provided.
Watertight – Designed to Types 4 specifications forindoor/outdoor use. Die casting is copper-free* aluminum. Cover are polycarbonate and gaskets areneoprene. Two 3/4” conduit hubs with one plug are provided.
* Less than 0.6% copper.
21
Two-Stage Fixed Deadband Transducer Units
22
S-SERIES Combustion Switches
How to Select1. Select the adjustable operating range based on desired actuation pressure.2. Check that proof pressure is sufficient.3. Read across and select thedesired S-Series switch unit with the proper enclosure.4. Continue across and select a matching transducer unit compatible with the fluid.
How to OrderFactory assembled – Simplyorder the switch and transducerunit by catalog number joined by a slash (/), e.g., SA30D/TA31A11.Field assembled – Simply order the switch and transducerunits separately by individual catalog number, e.g., one SA30D and one TA31A11.
How to Select and OrderASCO S-Series switches consist of two components, the switch unit and the transducer unit.
Single-Stage Adjustable Deadbandunits allow independentadjustment of the setand reset points overthe full operating rangeof the switch. Theminimum differencebetween set and resetpoints is the deadbandlisted below; themaximum differenceis the full range ofthe switch .
SB Switch Unit: Single-Stage FixedDeadband units have an adjustable setpoint and a non-adjustable automatic reset point.SD Switch Unit: Manual reset on decreas-ing pressure units operate automatically on increasing pressure and must be reset manually on decreasing pressure.(To order, change second digit to letter “D”,e.g., S B 30D becomes S D 30D).SE Switch Unit: Manual reset on increas-ing pressure units operate automaticallyon decreasing pressure and must be reset manually on increasing pressure.(To order, change second digit to letter “E”,e.g., S B 30D becomes S E 30D).
SA Switch Unit SB, SD or SE Switch Unit SC Switch Unit
UL General Purpose
Specifications Adjustable Deadband Fixed Deadband or Manual Reset
Values shown are nominal.1
AdjustableOperating
Range(psig)
ProofPressure
(psig)Catalog
No.
GeneralPurpose
WatertightEnclosure
WatertightEnclosure
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
FixedDeadband
AtMid-Range
(psig.) 1
FixedDeadband
AtMid-Range
(psig) 1
Minimum AtMid-Range
(psig)
Separation
MaximumFull Scale
1
Minimum AtMid-Range
(psig)
AdjustableDeadbandMaximumFull Scale
CatalogNo.
GeneralPurpose
Explosion-Proof
CatalogNo.
CatalogNo.
CatalogNo.
GeneralPurpose
Explosion-Proof
CatalogNo.
CatalogNo.
1515252525
150150200150150200200
252525404040
100100100150150200
0 - 27” W.C.0 - 65” W.C.
15 - 140” W.C.15 - 250” W.C.25 - 400” W.C.0.8 - 9.01.0 - 181.5 - 301.5 - 362.0 - 602.0 - 603.0 - 100
2 - 12” W.C.2 - 27” W.C.2 - 65” W.C.
15 - 140” W.C.15 - 250” W.C.25 - 400” W.C.0.4 - 4.50.8 - 9.01.0 - 181.5 - 362.0 - 603.0 - 100
1.2” W.C.1.4” W.C.3.0” W.C.6.0” W.C.8.0” W.C.
0.90.61.51.42.32.03.7
1.0” W.C.1.2” W.C.1.4” W.C.3.0” W.C.6.0” W.C.8.0” W.C.
0.30.30.40.91.52.5
2.0” W.C.2.5” W.C.6.0” W.C.
10.0” W.C.15.0” W.C.
1.44.64.03.35.45.09.0
1.5” W.C.2.0” W.C.2.5” W.C.6.0” W.C.
10.0” W.C.1 5.0” W.C.
0.40.61.12.23.66.0
1.7” W.C.2.0” W.C.4.0” W.C.7.0” W.C.
13.0” W.C.1.51.02.02.03.53.05.0
1.4” W.C.1.7” W.C.2.0” W.C.4.0” W.C.7.0” W.C.
13.0” W.C.0.50.50.51.22.13.5
2.7” W.C.6.5” W.C.
14.0” W.C.25.0” W.C.40.0” W.C.
1.61.83.03.66.06.0
10.0
2.4” W.C.2.7” W.C.6.5” W.C.
14.0” W.C.25.0” W.C.40.0” W.C.
0.70.91.83.66.0
10.0
SA30DSA20DSA20DSA10DSA10DSA40DSA30DSA30DSA20DSA10DSA20DSA10D
SA40DVSA30DVSA20DVSA20DVSA10DVSA10DVSA40DVSA30DVSA20DVSA20DVSA10DVSA10DV
SA31DSA21DSA21DSA11DSA11DSA41DSA31DSA31DSA21DSA11DSA21DSA11D
SA41DVSA31DVSA21DVSA21DVSA11DVSA11DVSA41DVSA31DVSA21DVSA21DVSA11DVSA11DV
SA32DSA22DSA22DSA12DSA12DSA42DSA32DSA32DSA22DSA12DSA22DSA12D
------------------------------------
SC30DSC20DSC20DSC10DSC10DSC40DSC30DSC30DSC20DSC10DSC20DSC10D
SC40DVSC30DVSC20DVSC20DVSC10DVSC10DVSC40DVSC30DVSC20DVSC20DVSC10DVSC10DV
SC31DSC21DSC21DSC11DSC11DSC41DSC31DSC31DSC21DSC11DSC21DSC11D
SC41DVSC31DVSC21DVSC21DVSC11DVSC11DVSC41DVSC31DVSC21DVSC21DVSC11DVSC11DV
SC32DSC22DSC22DSC12DSC12DSC42DSC32DSC32DSC22DSC12DSC22DSC12D
------------------------------------
SB30DSB20DSB20DSB10DSB10DSB40DSB30DSB30DSB20DSB10DSB20DSB10D
SB40DVSB30DVSB20DVSB20DVSB10DVSB10DVSB40DVSB30DVSB20DVSB20DVSB10DVSB10DV
SB31DSB21DSB21DSB11DSB11DSB41DSB31DSB31DSB21DSB11DSB21DSB11D
SB41DVSB31DVSB21DVSB21DVSB11DVSB11DVSB41DVSB31DVSB21DVSB21DVSB11DVSB11DV
SB32DSB22DSB22DSB12DSB12DSB42DSB32DSB32DSB22DSB12DSB22DSB12D
------------------------------------
CatalogNo.
Brass &Buna “N”
All 316 SS
316 SS &Viton
CatalogNo.
CatalogNo.
---------------------
TF32A21------
TF22A21TF12A21
------------------
TD40A21TD30A21TD20A21TE20A21TE10A21TF10A21
CatalogNo.
Aluminum &Buna “N”
TA31A11TA21A11TB21A11TB11A11TC11A11
---------------------
TA40A11FTA30A11FTA20A11FTB20A11TB10A11TC10A11TD40A11TD30A11TD20A11TE20A11TE10A11TF10A11
---------------
TE40A44TE30A44
---TE20A44TE10A44
---TF10A44
------------------------------------
------------------------------------
TA40A32FTA30A32FTA20A32FTB20A32TB10A32TC10A32TD40A42TD30A42TD20A42TE20A42TE10A42TF10A42
Two-Stage Fixed Deadbandunits consist of two separate snap-actionswitches, each with an independentlyadjustable set point and non-adjustablereset point. The difference between theset and reset points of each switch is thedeadband listed below; the minimumdifference between the set points of thetwo switches is the separation.
Select transducer unit belowOptions – Add appropriate suffix for desired option(see pages 34-35).Important Note: The third digit of each of the catalognumbers must be identical, e.g., SA 3 0D and TA 3 1A11.
4 123
UL Listed
FM Approved
Transducer Unit
These guage pressure type transducers provide for one pressure connection in the bottom of thetransducer. They are diaphragm/piston type trans-ducers using an elastomer in contact with the fluid,backed by a piston cylinder. UL requires a doublechamber transducer for fuel gas service and singlechamber 316 SS transducer for fuel oil service.
Standard connection is 1/4” NPT
UL Listed FM Approved
FM General Purpose
Manual reset units not available for FM.2 316 SS transducers increase deadband by 50%.3 Transducers ending in 32 have 303 SS process connections, not 316 SS.4
43
1
2
Fuel Gas and Fuel Oil
Fuel Gas Fuel Oil
23
Select S-Series pressure switch SA, SB, SC, SD and SE unit below
34
OPTIONS Pressure/Temperature Switches
H-Series, P-Series and S-SeriesSnap-Action Switch OptionsOptional snap-action switches to meet specific electrical loadsor application conditions are available on most ASCO TRI-POINTswitch units. Generally, the construction of a switch unit withoptional snap-action switches contains other specific parts andmay be ordered only as a factory-built unit. To specify a particularoptional construction, add the appropriate suffix to the switch unitcatalog number, e.g., SA10D with optional gold contact snap-action switch (suffix “P”) would become SA10D P .
P-SeriesSwitch OptionsPanel Mount – Open frame P-Series compact switch units areavailable for panel mounting with the switch unit inside and thetransducer outside. The panel separates the fluid sensing portionfrom the electromechanical portion. Five holes for bolts andoperating stem must be drilled or punched through the panel.Three constructions are available: add the suffix listed below tothe switch unit catalog number for the desired thickness.
S-SeriesSwitch OptionsIndustrial Adjusting Nut Covers –Available in clear plastic or metal toprevent tampering with set pointadjusting nuts.Clear plastic cover: To order, addsuffix “1” to the switch unit catalognumber, or order separately as SP01.Metal cover: To order, add suffix “2” tothe switch unit catalog number, ororder separately as SP02.JIC Construction – A switch unithaving the electrical and adjusting nutcovers attached to the switch body bya chain. Also designed to Type 13specifications. To order, add suffix “3”to the switch unit catalog number, ororder separately as SP03.Terminal Block – Applicable to switchunits with one single-poledouble-throwswitch. The terminal strip is prewiredto the snap-action switch. To order, addsuffix “4” to the switch unit catalognumber, or order separately as SP04.Factory Sealed – Explosion-proofunits may be ordered with a factoryseal separating the electrical chamberfrom the conduit hubs and 24” long#14 AWG 105°C. rated lead wires. Toorder, change the fourth digit of theswitch unit catalog number from “2” to“3”, e.g., SA1 2 D becomes SA1 3 D.
CatalogSuffix
Deadband VariationFrom ListingElectrical RatingDescription
SuffixPanel Thickness
10 Ga (.135+.005)14 Ga (.075+.005)16 Ga (.060+.005)
101112
5 Amp, 125, 250 VAC1/4 HP, 125 VAC1/2 HP, 250 VAC1 Amp, 125 VDC1/2 Amp, 250 VDC
10 Amp, 125 VAC, VDC1/8 HP, 125 VAC, VDC
5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC1 Amp, 28 VAC1 Amp, 28 VDC25 Amp Res, 28 VDC10 Amp Ind, 28 VDC5 Amp Motor, 28 VDC3 Amp Lamp, 28 VDC1 Amp, 125 VAC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC20 Amp, 125, 250 VAC1 HP, 125 VAC2 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC
SA: +50%SB, SC, PA: +100%
H: +200%PB: +400%SA: +50%
SB, SC, PA: +100%H: +120%
PB: +400%
SA, SB, SD, SE, PB: +50%
SA, SB, SC, PA: +25%H: +50%
PB, PC: +100% SA, PA: +100%
H: +200%PB: +600%
SA, SB, SC: +25%
SA: +50%SB, SC: +100%
PB: +400%
SA: NoneSB, SC, PA: +25%
PB, H: +50%
SB, SC: -50%
DC Rating1 Amp
Double Break
DC Rating10 Amps, SPDT
Double-poleDouble-throw(Two SPDT
Switches withCommon Lever)
Gold ContactDry Circuit SPDT
HermeticallySealedSPDT
High Ambient250°FSPDT
High Power1 HPSPDT
MoistureResistant
Sealed SwitchSPDT
TightFixed
DeadbandSPDT
G
M
K
P
H
F
W
J
T
35
4 123
Pressure Transducer Options
P-Series and S-Series Temperature Transducer Options
Special Wetted Materials – The following diaphragms maybe substituted on transducer body materials of aluminum,brass, polyester and stainless steel. To order, substitute thematerial code below in the seventh digit of the transducercatalog number, e.g., a TF10A1 1 with optional viton diaphragmbecomes a TF10A1 2 .
Oxygen Cleaning – Pressure transducers for oxygen serviceshould be specially cleaned. They are degreased and blacklightinspected, then assembled in a clean area and tested withoil-free air or nitrogen. Use metal body transducer with viton orneoprene diaphragm and add suffix “H” to transducer catalognumber, e.g., TA40A13 becomes TA40A13 H .
Pressure Snubbers – A pressure snubber (1/4” NPTF by1/4” NPTM) installed in the transducer pressure connectionwill dampen the pressure spikes to a value which will notcause damage. It consists of a body with a porous metal discof stainless steel through which the fluid passes. To order,select a snubber compatible with the fluid. Available byseperate catalog number only (see table below).
Process Connection – A female process connection (1/4”NPT) is standard on all pressure transducers. A 1/2” NPT isavailable as an option on gauge pressure transducers. Toorder, add suffix “B” to transducer catalog number, e.g.,RF10A21 becomes RF10A21 B .Note: Not available on nylon transducers.
Armored Capillaries – Double braided copper armor isstandard for copper capillary units. Stainless steel spiralinterlocked armor is available for stainless steel capillaryunits. Add suffix “C” to transducer catalog number.
Thermal Well – Use with direct or remote sensors for protecting sensing bulb. This allows removal of bulb while maintaining a pressure-tight vessel. Available in 1/2” NPT or 3/4”NPT process connection in brass or 316 SS. Dimensions are inaccordance with SAMA Std. RC17-9. Standard “U” dimension(insertion length) is 2-1/2” for direct mount and 6’ capillary unitsand is 4-1/2” for 12’ capillary units.
Longer Capillaries – Standard copper and stainless steelcapillary units can be furnished in 12’ lengths. To order, addsuffix “D” to transducer catalog number. Consult ASCO for longer length capillaries.
Union Connector – For use with remote units for mountingof bulb in fluid being controlled. Available in 1/2” NPT and3/4” NPT process connections in brass or 316 SS.
MaterialCodeDiaphragm Temperature Range
Buna “N”Ethylene Propylene
NeopreneFluorosilicone
Viton
-4°F (-20°C) to 180°F (82°C)-4°F (-20°C) to 250°F (121°C)-4°F (-20°C) to 180°F (82°C)-40°F (-40°C) to 250°F (121°C)-4°F (-20°C) to 250°F (121°C)
16372
BrassCatalog No.
303 SSCatalog No.Fluid
Air, Non-Hazardous GasesWater, Light Oil (under 225 SSU)
Oil (Heavy, (over 225 SSU)Pressure Rating (psig)
TP04G3TP04E3TP04D3
5000
TP04G2TP04E2TP04D2
2000
BulbLength(Inches)
TransducerSuffix
“U” DimensionRequired(Inches)
CapillaryLength(Feet)
612
13 - 2021 - 5051 - 80
3-1/25-1/25-1/28-1/2
11-1/2
2-1/24-1/24-1/27-1/2
10-1/2
---DEFG
PressureRating(psig) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass316 SS
QP01QP05
QP02---
5001500
PressureRating(psig)
“U”Dimensions
(Inches) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass
316 SS
QP03QP13QP23QP33QP07QP17QP27QP37
QP04QP14QP24QP34QP08QP18QP28QP38
1000
6000
2-1/24-1/27-1/2
10-1/22-1/24-1/27-1/2
10-1/2
Thermal Well
Jam nuts provided with thermal wells.1
1
Switch Unit – ASCO uses the term “switch unit” to describethe electromechanical portion of a pressure or temperatureswitch. This is used in conjunction with a transducer unit toform a complete pressure or temperature switch.
Transducer Unit – ASCO uses the term “transducer unit” todescribe that portion of a pressure or temperature switch towhich a pressure or temperature is applied which convertsthe input signal to another form of energy to operate theswitch unit.
Two-Stage (Dual) – ASCO uses the term “two stage” todescribe a pressure or temperature switch which is equivalentto two pressure or temperature switches which areindependently adjustable. This switch is equivalent to twofixed deadband switches.
Deadbands – The deadband is the difference between theset point and reset point readings. Deadbands are listedin the specification tables at nominal values. They are representative of the deadbands of the units at the middleof the range.
The deadband values for the full range adjustable deadbandswitches and limited adjustable deadband switches indicatethe values through which the deadband may be adjusted.
Generally, as the set point is adjusted through the operatingrange, the deadband will vary. Normally, it will becomenarrower as the set point is towards the bottom of the range,and will become wider when the set point is towards the topof the range. The graph shown below indicates representativetrends of this type of deadband variation.
Temperature switch deadbands are a result of the characteris-tics of the vapor pressure curve as well as other factors.Normally, this results in a deadband which is narrower in thetop third of the range than in the bottom third of the range.The values published are nominal and representative of mid-range set points.
36
Definitions and Fluid Compatibility Guide
Accuracy – The maximum deviation from the set pointunder specified operating condition (ambient temperature,barometric pressure, etc.).
Adjustable Deadband – Refers to the capability of apressure or temperature switch to allow the deadband to beadjusted over a given range. Certain ASCO TRI-POINTswitches have an adjustable deadband which can beadjusted over the total operating range of the switch.
Adjustable Operating Range – The pressure or tempera-ture range of the switch within which the set point may beadjusted.
Differential Pressure – The difference between twopressures. A differential pressure switch senses two pressuresources and can be adjusted to actuate on a desireddifference between them.
Guage Pressure – The actual reading of a typical pressureguage and is the difference between the pressure within avessel and the atmospheric pressure surrounding it. It isnormally measured in pounds per square inch (psig).
Manual Reset – The switch is a semi-automatic devicewhich operates automatically with a signal change in onedirection but must be manually reset once the signal returnsto its original position.
Proof Pressure – A pressure which a device can besubjected to for extended periods of time without changesin its operating characteristics.
Rated Overrange Temperature – A temperature which adevice can be subjected to for extended periods of timewithout changes in its operating characteristics.
Repeatability – The closeness of agreement among anumber of consecutive measurements of the output for thesame value of input under the same operating conditionsapproaching from the same direction. Repeatability isnormally specified as a percentage of the upper limit of theoperating range.
Example: Operating range 5-100 psig with +1%repeatability; equals +1% of 100 psig or +1 psig.
Reset Point – After a pressure or temperature switch hasreached its set point and operated the electrical switch, itmust return to a point called the reset point before theelectrical switch can return to its original position.
Set Point – The pressure reading at which the electricalswitch element changes contact position (it can be specifiedeither increasing or decreasing).
Definitions
Deadbands
1.5 x CatalogValue
CatalogValue
Half CatalogValue
Bottom Mid Top
Position of Set Point in Range
37
4 123
These recommendations are to be used as a guide only, as servicelife of material is dependent on temperature, concentrations, orcatalysts that may be added and other conditions which arebeyond our control.Consult ASCO for specific service applications.
Note: Items in black circles are standard catalog units.All others available on factory order.
P - Indicates preferred construction. S - Indicates satisfactory construction.
Transducer Material Code of Two Digits represents process connectionmaterial and diaphragm material, respectively; these are the sixth andseventh positions of the pressure transducer catalog number.
Process Connection: 6th Position Diaphragm: 7th Position
1 Aluminum 4 316 S.S. 1 Buna “N” 4 316 S.S.2 Brass 7 Nylon/Brass 2 Viton 6 Ethylene Propylene3 303 S.S. 3 Neoprene 7 Fluorosilicone
Fluid Compatibility Guide
Acetic Acid
Acetylene
Air
Ammonia
Argon-Welding
Benzene-Benzol
Butane
Carbon Tetrachloride
Cellulube
Coke Oven Gas
Ethyl Alcohol (denatured)
Ethylene Glycol
Freon Refrigerants
Freon Solvents
(“MF”, “TF”, “BF”)
Fuel Oils and Diesel
Gasoline
Gas, Inert
Gas (natural and
manufactured)
Helium
Hydrogen
Jet Fuel (JP1 to JP6)
Kerosene
Methyl Alcohol (Methanol)
Naphtha
Nitrogen
Oils (coolant, hydraulic,
lubricating and motor)
Oxygen, Gaseous
Potassium Sulfate
Propane Gas and Liquid
“Pydraul” (“Monsanto”)
Steam
Steam Condensate
Stoddard Solvent
Toluene (Tolulo)
Vacuum
Vegetable Oil
Vinegar
Water, Fresh, Boiler Feed
Water (Distilled, Deionized,
Demineralized)
Water, Sea
Material Code 11YesYes400
12YesYes400
13YesYes400
16YesYes400
17YesYes400
21YesNo
3500
22YesNo
3500
23YesNo
3500
26YesNo
3500
27YesNo
3500
31YesYes8000
32YesYes8000
33YesYes8000
36YesYes8000
37YesYes8000
42YesYes8000
44NoNo400
71NoNo200
VacuumInches of WaterP.S.I.G. to R
ang
esA
vaila
ble
For high purity applications use stainless steel transducers.Notes: 1 Oxygen service requires special cleaning, specify suffix “H”.2 For steam service a condensate loop (pigtail) is required.3
For pressure transducers for combustion service see pages 20-23.4 Material availability refers to standard gauge pressure constructions only.5
5
1
2
3
4
4
PP
P
P
PP
P
P
P
PP
PPPP
P
PP
P
PP
S
S
S
SS
P
S
S
S
SS
SSSS
S
SS
PPS
S
P
SS
SPS
P
SS
S
S
S
SSPS
SS
S
SSSP
SPSS
S
S
SS
S
S
SS
S
S
PSS
SS
SS
S
S
SS
S
SS
S
S
S
S
S
S
S
S
S
S
S
S
S
SS
S
SS
S
SSS
S
SS
S
S
S
S
SSSS
SS
S
SSSSSSSSS
S
S
S
SS
S
S
SS
S
S
SSS
S
S
S
S
SS
S
SS
S
S
S
SS
S
S
S
S
S
S
S
S
S
S
S
SS
SSS
S
S
S
S
S
SS
S
S
S
S
SS
SSSS
S
SS
SSS
SS
S
P
SS
SSSPSPSS
S
S
S
S
SSSS
SS
S
SSSSSSSSSSSS
S
SS
S
SS
S
S
SS
S
S
SSS
SS
S
S SSS
S
S
SS
S
SS
S
S
S
SS
S
SS
S
S
S
S
S
S
S
S
S
S
SS
SSS
SSSS
S
SS
SSSPSPSS
S
S
S
S
SSS
SSS
S
SSSSSSSSSSSS
S
SP
SPSSSSSSSSP
S
SPS
S
SSSSSSS
S
SSSSSSSS
SPS
S
S
P
P
P
P
P
P
P
P
14
S-SERIES Pressure Switches
Features:• Set point repeatability, +1% of operating range.• All wiring terminals, adjustments and visual scales are
accessible from the front of the switch.• Choice of general purpose, watertight or explosion-
proof enclosures.• Choice of fixed or full-range adjustable deadband.• Choice of single or two-stage units.• Manual reset units available.• Mounts in any position.• Rugged and vibration resistant.• Visual adjustment scales in psi and bars.• External adjusting nuts.• Separate electrical, pressure and adjusting
chambers.• Wide selection of transducer wetted materials suitable for air, water, oil or corrosive fluids.• Mix and match switch and transducer components for
increased stock flexibility or to change pressure ranges in field.
General Description:ASCO S-Series pressure switches consist of a switchunit and a transducer unit. They can be ordered separately for customer stocking and/or field assemblyor as a complete factory-assembled unit.
SwitchS-Series pressure switch units incorporate the uniqueASCO TRI-POINT alternating fulcrum balance plate tocontrol the operation of one or more electrical snap-action swtiches. The electrical snap-action switchtogether with the adjusting mechanism is a fully-tested,self-contained subassembly.
TransducerTransducer unit incorporates a diaphragm/piston type pressure sensor, and is also a fully-tested, self-contained subassembly.
OperationWhen pressure is applied to the transducer it is converted into movement of the piston. This pistonmovement is then used to control the operation of the electrical snap-action switch in the switch unit.
Standard Electrical Ratings
Switches for Pressure to 8000 psig, Vacuum, Differential, orLevel Control with General Purpose, Watertight orExplosion-Proof Enclosures
SA, SB, SC, SD and SE Series15 Amp Res., 125 VAC10 Amp Res., 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp Res., 125 VDC1/4 Amp Res., 250 VDC
^ %
SPDTNO
NC
C
Standard Temperature Ratings
Ambient: -4°F (-20°C) to 140°F (60°C)Fluid: For Buna “N” or Neoprene Diaphragm
-4°F (-20°C) to 180°F (82°C)For Viton Diaphragm-4°F (-20°C) to 250°F (121°C)For 316 SS Diaphragm-50°F (-45°C) to 300°F (149°C)
Options (See pages 34-35)
4 123
EnclosuresASCO TRI-POINT S-Series switches are available inthree standard enclosures. All of these enclosed unitsare made in accordance with NEMA and UL standards.
General Purpose – Type 1. These enclosures aredesigned for indoor use to protect personnel fromaccidental contact with the equipment. S-Series general purpose switch units consist of a copper-free*aluminum die-cast body with a formed copper-free* aluminum cover; two 3/4” conduit hubs with one plugare provided.
Watertight – Type 4. Watertight and dust-tight enclo-sures are intended for use indoors and outdoors to protect the enclosed equipment against splashing orfalling water, windblown dust and water, hose directedwater, and severe external condensation. S-Serieswatertight switch units have a copper-free* aluminumdie-cast body and a formed copper-free* aluminumcover with Buna “N” gaskets; two 3/4” conduit hubs with one plug are provided.
Explosion-Proof – Types 7 and 9. Type 7 enclosuresare intended for use in locations defined by the NationalElectrical Code as Class I. Type 9 enclosures areintended for Class II locations.
Class I locations are those in which flammable gasesare or may be present in the air in sufficient quantitiesto produce explosive or ignitable mixtures. Class I loca-tions are classified by group letter, which defines partic-ular atmospheres. Division 1 locations are areas wherethe hazardous concentration exists continuously, inter-mittently or periodically under normal operating condi-tions. Division 2 locations are those where the haz-ardous vapors are present only in case of accidentalrupture or breakdown of equipment.
ASCO TRI-POINT explosion-proof enclosures with letter B, C or D in the fifth position are listed for Class I,Groups B, C, and D, Division 1. They are also suitablefor the less stringent Division 2 environment.
Class II locations are those which are hazardousbecause of the presence of combustible dust. All ASCO TRI-POINT explosion-proof enclosures are listed for Groups E, F, and G locations.
The switch body and cover are die-cast copper-free*aluminum with a Buna “N” gasket. Two 3/4” conduithubs with one plug are provided.
Dimensions (inches)
* Less than 0.6% copper.
2.2
4.06
1.03
3.5
3.2
3.7
7.5 1 1.0
4.3 1
1.6 2.32.3
11/32 DIA. FORMOUNTING(2PLACES)
3/4 NPT FORCONDUIT CONN.BOTH ENDS
ADDITIONAL SPACE REQUIREDFOR REMOVAL OF COVER
1/4 OR 1/2 NPT
1 ON TV SERIES ADD 7/16" TO THESE DIMENSIONS3.2
7.0
2.9
1.7
4.1
1.0
7.4
1.6
3.5
2.3
7.0
1.03
1.5
2.2
3.7
1/4 NPT
11/32 DIA. FORMOUNTING(2PLACES)
3/4 NPT FORCONDUIT CONN.BOTH ENDS
ADDITIONAL SPACE REQUIREDFOR REMOVAL OF COVER
1/4 NPT VENT CONNECTION ONDOUBLE CHAMBER TRANSDUCERS
S-Series Pressure
With Types TD - TV Transducers With Types TA - TC Transducers
15
Two-Stage Fixed Deadband Transducer Units
16
S-SERIES Pressure Switches (to 8000 psig)
How to Select1. Select the adjustable operating range based on desired actuation pressure.2. Check that proof pressure is sufficient.3. Read across and select thedesired S-Series switch unit with the proper enclosure.4. Continue across and select a matching transducer unit compatible with the fluid.
How to OrderFactory assembled – Simplyorder the switch and transducerunit by catalog number joined by a slash (/), e.g., SA40D/TA40A11.Field assembled – Simply order the switch and transducerunits separately by individual catalog number, e.g., one SA40D and one TA40A11.
How to Select and OrderASCO S-Series switches consist of two components, the switch unit and the transducer unit.
Single-Stage Adjustable Deadbandunits allow independent adjustment ofthe set and resetpoints over the fulloperating range ofthe switch. Theminimum differencebetween set andreset points is thedeadband listedbelow; the maximumdifference is the fullrange of the switch .
SB Switch Unit: Single-Stage FixedDeadband units have an adjustable set pointand a non-adjustable automatic reset point.SD Switch Unit: Manual reset on decreasingpressure units operate automatically onincreasing pressure and must be reset manually on decreasing pressure.(To order, change second digit to letter “D”,e.g., S B 40D becomes S D 40D).SE Switch Unit: Manual reset on increasingpressure units operate automatically ondecreasing pressure and must be reset manually on increasing pressure.(To order, change second digit to letter “E”,e.g., S B 40D becomes S E 40D).
SA Switch Unit SB, SD or SE Switch Unit SC Switch Unit
General Purpose
Specifications Adjustable Deadband Fixed Deadband or Manual Reset
All switch units above are in stock for immediate delivery.
Values shown are nominal.1
All switch units and transducer units above are in stock for immediate delivery.
316 SS transducers increase deadband by 50%.2 Transducers ending in 32 have 303 SS process connections, not 316 SS.3
AdjustableOperating
Range(psig)
ProofPressure
(psig)
Minimum AtMid-Range
(psig)
AdjustableDeadband
MaximumFull Scale
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.1
FixedDeadband
AtMid-Range
(psig) 1
FixedDeadband
AtMid-Range
(psig) 1
Minimum AtMid-Range
(psig)
Separation
MaximumFull Scale
1
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
252525404040
100100150100150150150
3000200
30003000400600600900
1500230050009000
0 - 12” W.C.0 - 27” W.C.0 - 65” W.C.
15 - 140” W.C.15 - 250” W.C.25 - 400” W.C.
1.5” W.C.2.0” W.C.2.5” W.C.6” W.C.10” W.C.15” W.C.
0.40.61.41.11.62.23.66.06.010141218243675115225450
1.0” W.C.1.2” W.C.1.4” W.C.3” W.C.6” W.C.8” W.C.
0.30.30.80.41.00.91.54.02.55.06.05.08
10153045
125275
1.2” W.C.1.4” W.C.1.6” W.C.4.0” W.C.7.0” W.C.
13.0” W.C.0.40.41.00.61.21.42.25.53.57.08.57.01014204060
150300
2.4” W.C.2.7” W.C.6.5” W.C.14” W.C.25” W.C.40” W.C.
0.70.91.61.81.83.668
10122020304060
100150350800
SA40DSA30DSA20DSA20DSA10DSA10DSA40DSA30DSA40DSA20DSA30DSA20DSA10DSA30DSA10DSA20DSA10DSA10DSA10DSA10DSA10DSA10DSA10DSA10DSA10D
SA41DSA31DSA21DSA21DSA11DSA11DSA41DSA31DSA41DSA21DSA31DSA21DSA11DSA31DSA11DSA21DSA11DSA11DSA11DSA11DSA11DSA11DSA11DSA11DSA11D
SA42DSA32DSA22DSA22DSA12DSA12DSA42DSA32DSA42DSA22DSA32DSA22DSA12DSA32DSA12DSA22DSA12DSA12DSA12DSA12DSA12DSA12DSA12DSA12DSA12D
SC40DSC30DSC20DSC20DSC10DSC10DSC40DSC30DSC40DSC20DSC30DSC20DSC10DSC30DSC10DSC20DSC10DSC10DSC10DSC10DSC10DSC10DSC10DSC10DSC10D
SC41DSC31DSC21DSC21DSC11DSC11DSC41DSC31DSC41DSC21DSC31DSC21DSC11DSC31DSC11DSC21DSC11DSC11DSC11DSC11DSC11DSC11DSC11DSC11DSC11D
SC42DSC32DSC22DSC22DSC12DSC12DSC42DSC32DSC42DSC22DSC32DSC22DSC12DSC32DSC12DSC22DSC12DSC12DSC12DSC12DSC12DSC12DSC12DSC12DSC12D
SB40DSB30DSB20DSB20DSB10DSB10DSB40DSB30DSB40DSB20DSB30DSB20DSB10DSB30DSB10DSB20DSB10DSB10DSB10DSB10DSB10DSB10DSB10DSB10DSB10D
SB41DSB31DSB21DSB21DSB11DSB11DSB41DSB31DSB41DSB21DSB31DSB21DSB11DSB31DSB11DSB21DSB11DSB11DSB11DSB11DSB11DSB11DSB11DSB11DSB11D
SB42DSB32DSB22DSB22DSB12DSB12DSB42DSB32DSB42DSB22DSB32DSB22DSB12DSB32DSB12DSB22DSB12DSB12DSB12DSB12DSB12DSB12DSB12DSB12DSB12D
CatalogNo.
Brass &Buna “N”
All 316 SS
316 SS &Viton
CatalogNo.
CatalogNo.
------------------
TD40A21TD30A21
---TD20A21
---TE20A21TE10A21
---TF10A21
------
TG10A21TH10A21TJ10A21TK10A21TL10A21TM10A21TN10B21
---
CatalogNo.
Aluminum &Buna “N”
Water, AirOil or Gas Corrosive Fluids
Air, Oilor Gas
TA40A11TA30A11TA20A11TB20A11TB10A11TC10A11TD40A11TD30A11
---TD20A11
---TE20A11TE10A11
---TF10A11
------
TG10A11TH10A11TJ10A11
---------------
------------------------
TE40A44---
TE30A44TE20A44TE10A44
---TF10A44
------
TG10A44TH10A44TJ10A44
---------------
TA40A32TA30A32TA20A32TB20A32TB10A32TC10A32TD40A42TD30A42
---TD20A42
---TE20A42TE10A42TG33A42TF10A42TG23A42TG13A42TG10A42TH10A42TJ10A42TK10A42TL10A42TM10A42TN10B42TQ10B42
0.4 - 4.50.7 - 9.00.8 - 9.01.0 - 181.0 - 181.5 - 36
2 - 605 - 603 - 1005 - 1205 - 2006 - 200
13 - 30015 - 40030 - 60050 - 100075 - 1500
200 - 3500500 - 8000
Two-Stage Fixed Deadbandunits consist of two separate snap-actionswitches, each with an independentlyadjustable set point and non-adjustablereset point. The difference between theset and reset points of each switch is thedeadband listed below; the minimumdifference between the set points of thetwo switches is the separation.
Explosion Proof
Select transducer unit below
Transducer Unit
These guage pressure type transducers provide for one pressure connection in the bottom of thetransducer. They are diaphragm/piston type transducers using an elastomer in contact with thefluid, backed by a piston cylinder. This allows highsensitivity for low pressures and strength for highpressures.
Standard connection is 1/4” NPT; (Optional 1/2” NPTadd suffix “B” to catalog numbers TD thru TQ)
Series TA-TC Series TD-TQ
32
Options – Add appropriate suffix for desired option(see pages 34-35).Important Note: The third digit of each of the catalog numbersmust be identical, e.g., SA 4 0D and TA 4 0A11.
4 123
17
Select S-Series pressure switch SA, SB, SC, SD and SE unit below
34
OPTIONS Pressure/Temperature Switches
H-Series, P-Series and S-SeriesSnap-Action Switch OptionsOptional snap-action switches to meet specific electrical loadsor application conditions are available on most ASCO TRI-POINTswitch units. Generally, the construction of a switch unit withoptional snap-action switches contains other specific parts andmay be ordered only as a factory-built unit. To specify a particularoptional construction, add the appropriate suffix to the switch unitcatalog number, e.g., SA10D with optional gold contact snap-action switch (suffix “P”) would become SA10D P .
P-SeriesSwitch OptionsPanel Mount – Open frame P-Series compact switch units areavailable for panel mounting with the switch unit inside and thetransducer outside. The panel separates the fluid sensing portionfrom the electromechanical portion. Five holes for bolts andoperating stem must be drilled or punched through the panel.Three constructions are available: add the suffix listed below tothe switch unit catalog number for the desired thickness.
S-SeriesSwitch OptionsIndustrial Adjusting Nut Covers –Available in clear plastic or metal toprevent tampering with set pointadjusting nuts.Clear plastic cover: To order, addsuffix “1” to the switch unit catalognumber, or order separately as SP01.Metal cover: To order, add suffix “2” tothe switch unit catalog number, ororder separately as SP02.JIC Construction – A switch unithaving the electrical and adjusting nutcovers attached to the switch body bya chain. Also designed to Type 13specifications. To order, add suffix “3”to the switch unit catalog number, ororder separately as SP03.Terminal Block – Applicable to switchunits with one single-poledouble-throwswitch. The terminal strip is prewiredto the snap-action switch. To order, addsuffix “4” to the switch unit catalognumber, or order separately as SP04.Factory Sealed – Explosion-proofunits may be ordered with a factoryseal separating the electrical chamberfrom the conduit hubs and 24” long#14 AWG 105°C. rated lead wires. Toorder, change the fourth digit of theswitch unit catalog number from “2” to“3”, e.g., SA1 2 D becomes SA1 3 D.
CatalogSuffix
Deadband VariationFrom ListingElectrical RatingDescription
SuffixPanel Thickness
10 Ga (.135+.005)14 Ga (.075+.005)16 Ga (.060+.005)
101112
5 Amp, 125, 250 VAC1/4 HP, 125 VAC1/2 HP, 250 VAC1 Amp, 125 VDC1/2 Amp, 250 VDC
10 Amp, 125 VAC, VDC1/8 HP, 125 VAC, VDC
5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC1 Amp, 28 VAC1 Amp, 28 VDC25 Amp Res, 28 VDC10 Amp Ind, 28 VDC5 Amp Motor, 28 VDC3 Amp Lamp, 28 VDC1 Amp, 125 VAC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC20 Amp, 125, 250 VAC1 HP, 125 VAC2 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC
SA: +50%SB, SC, PA: +100%
H: +200%PB: +400%SA: +50%
SB, SC, PA: +100%H: +120%
PB: +400%
SA, SB, SD, SE, PB: +50%
SA, SB, SC, PA: +25%H: +50%
PB, PC: +100% SA, PA: +100%
H: +200%PB: +600%
SA, SB, SC: +25%
SA: +50%SB, SC: +100%
PB: +400%
SA: NoneSB, SC, PA: +25%
PB, H: +50%
SB, SC: -50%
DC Rating1 Amp
Double Break
DC Rating10 Amps, SPDT
Double-poleDouble-throw(Two SPDT
Switches withCommon Lever)
Gold ContactDry Circuit SPDT
HermeticallySealedSPDT
High Ambient250°FSPDT
High Power1 HPSPDT
MoistureResistant
Sealed SwitchSPDT
TightFixed
DeadbandSPDT
G
M
K
P
H
F
W
J
T
35
4 123
Pressure Transducer Options
P-Series and S-Series Temperature Transducer Options
Special Wetted Materials – The following diaphragms maybe substituted on transducer body materials of aluminum,brass, polyester and stainless steel. To order, substitute thematerial code below in the seventh digit of the transducercatalog number, e.g., a TF10A1 1 with optional viton diaphragmbecomes a TF10A1 2 .
Oxygen Cleaning – Pressure transducers for oxygen serviceshould be specially cleaned. They are degreased and blacklightinspected, then assembled in a clean area and tested withoil-free air or nitrogen. Use metal body transducer with viton orneoprene diaphragm and add suffix “H” to transducer catalognumber, e.g., TA40A13 becomes TA40A13 H .
Pressure Snubbers – A pressure snubber (1/4” NPTF by1/4” NPTM) installed in the transducer pressure connectionwill dampen the pressure spikes to a value which will notcause damage. It consists of a body with a porous metal discof stainless steel through which the fluid passes. To order,select a snubber compatible with the fluid. Available byseperate catalog number only (see table below).
Process Connection – A female process connection (1/4”NPT) is standard on all pressure transducers. A 1/2” NPT isavailable as an option on gauge pressure transducers. Toorder, add suffix “B” to transducer catalog number, e.g.,RF10A21 becomes RF10A21 B .Note: Not available on nylon transducers.
Armored Capillaries – Double braided copper armor isstandard for copper capillary units. Stainless steel spiralinterlocked armor is available for stainless steel capillaryunits. Add suffix “C” to transducer catalog number.
Thermal Well – Use with direct or remote sensors for protecting sensing bulb. This allows removal of bulb while maintaining a pressure-tight vessel. Available in 1/2” NPT or 3/4”NPT process connection in brass or 316 SS. Dimensions are inaccordance with SAMA Std. RC17-9. Standard “U” dimension(insertion length) is 2-1/2” for direct mount and 6’ capillary unitsand is 4-1/2” for 12’ capillary units.
Longer Capillaries – Standard copper and stainless steelcapillary units can be furnished in 12’ lengths. To order, addsuffix “D” to transducer catalog number. Consult ASCO for longer length capillaries.
Union Connector – For use with remote units for mountingof bulb in fluid being controlled. Available in 1/2” NPT and3/4” NPT process connections in brass or 316 SS.
MaterialCodeDiaphragm Temperature Range
Buna “N”Ethylene Propylene
NeopreneFluorosilicone
Viton
-4°F (-20°C) to 180°F (82°C)-4°F (-20°C) to 250°F (121°C)-4°F (-20°C) to 180°F (82°C)-40°F (-40°C) to 250°F (121°C)-4°F (-20°C) to 250°F (121°C)
16372
BrassCatalog No.
303 SSCatalog No.Fluid
Air, Non-Hazardous GasesWater, Light Oil (under 225 SSU)
Oil (Heavy, (over 225 SSU)Pressure Rating (psig)
TP04G3TP04E3TP04D3
5000
TP04G2TP04E2TP04D2
2000
BulbLength(Inches)
TransducerSuffix
“U” DimensionRequired(Inches)
CapillaryLength(Feet)
612
13 - 2021 - 5051 - 80
3-1/25-1/25-1/28-1/2
11-1/2
2-1/24-1/24-1/27-1/2
10-1/2
---DEFG
PressureRating(psig) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass316 SS
QP01QP05
QP02---
5001500
PressureRating(psig)
“U”Dimensions
(Inches) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass
316 SS
QP03QP13QP23QP33QP07QP17QP27QP37
QP04QP14QP24QP34QP08QP18QP28QP38
1000
6000
2-1/24-1/27-1/2
10-1/22-1/24-1/27-1/2
10-1/2
Thermal Well
Jam nuts provided with thermal wells.1
1
Switch Unit – ASCO uses the term “switch unit” to describethe electromechanical portion of a pressure or temperatureswitch. This is used in conjunction with a transducer unit toform a complete pressure or temperature switch.
Transducer Unit – ASCO uses the term “transducer unit” todescribe that portion of a pressure or temperature switch towhich a pressure or temperature is applied which convertsthe input signal to another form of energy to operate theswitch unit.
Two-Stage (Dual) – ASCO uses the term “two stage” todescribe a pressure or temperature switch which is equivalentto two pressure or temperature switches which areindependently adjustable. This switch is equivalent to twofixed deadband switches.
Deadbands – The deadband is the difference between theset point and reset point readings. Deadbands are listedin the specification tables at nominal values. They are representative of the deadbands of the units at the middleof the range.
The deadband values for the full range adjustable deadbandswitches and limited adjustable deadband switches indicatethe values through which the deadband may be adjusted.
Generally, as the set point is adjusted through the operatingrange, the deadband will vary. Normally, it will becomenarrower as the set point is towards the bottom of the range,and will become wider when the set point is towards the topof the range. The graph shown below indicates representativetrends of this type of deadband variation.
Temperature switch deadbands are a result of the characteris-tics of the vapor pressure curve as well as other factors.Normally, this results in a deadband which is narrower in thetop third of the range than in the bottom third of the range.The values published are nominal and representative of mid-range set points.
36
Definitions and Fluid Compatibility Guide
Accuracy – The maximum deviation from the set pointunder specified operating condition (ambient temperature,barometric pressure, etc.).
Adjustable Deadband – Refers to the capability of apressure or temperature switch to allow the deadband to beadjusted over a given range. Certain ASCO TRI-POINTswitches have an adjustable deadband which can beadjusted over the total operating range of the switch.
Adjustable Operating Range – The pressure or tempera-ture range of the switch within which the set point may beadjusted.
Differential Pressure – The difference between twopressures. A differential pressure switch senses two pressuresources and can be adjusted to actuate on a desireddifference between them.
Guage Pressure – The actual reading of a typical pressureguage and is the difference between the pressure within avessel and the atmospheric pressure surrounding it. It isnormally measured in pounds per square inch (psig).
Manual Reset – The switch is a semi-automatic devicewhich operates automatically with a signal change in onedirection but must be manually reset once the signal returnsto its original position.
Proof Pressure – A pressure which a device can besubjected to for extended periods of time without changesin its operating characteristics.
Rated Overrange Temperature – A temperature which adevice can be subjected to for extended periods of timewithout changes in its operating characteristics.
Repeatability – The closeness of agreement among anumber of consecutive measurements of the output for thesame value of input under the same operating conditionsapproaching from the same direction. Repeatability isnormally specified as a percentage of the upper limit of theoperating range.
Example: Operating range 5-100 psig with +1%repeatability; equals +1% of 100 psig or +1 psig.
Reset Point – After a pressure or temperature switch hasreached its set point and operated the electrical switch, itmust return to a point called the reset point before theelectrical switch can return to its original position.
Set Point – The pressure reading at which the electricalswitch element changes contact position (it can be specifiedeither increasing or decreasing).
Definitions
Deadbands
1.5 x CatalogValue
CatalogValue
Half CatalogValue
Bottom Mid Top
Position of Set Point in Range
37
4 123
These recommendations are to be used as a guide only, as servicelife of material is dependent on temperature, concentrations, orcatalysts that may be added and other conditions which arebeyond our control.Consult ASCO for specific service applications.
Note: Items in black circles are standard catalog units.All others available on factory order.
P - Indicates preferred construction. S - Indicates satisfactory construction.
Transducer Material Code of Two Digits represents process connectionmaterial and diaphragm material, respectively; these are the sixth andseventh positions of the pressure transducer catalog number.
Process Connection: 6th Position Diaphragm: 7th Position
1 Aluminum 4 316 S.S. 1 Buna “N” 4 316 S.S.2 Brass 7 Nylon/Brass 2 Viton 6 Ethylene Propylene3 303 S.S. 3 Neoprene 7 Fluorosilicone
Fluid Compatibility Guide
Acetic Acid
Acetylene
Air
Ammonia
Argon-Welding
Benzene-Benzol
Butane
Carbon Tetrachloride
Cellulube
Coke Oven Gas
Ethyl Alcohol (denatured)
Ethylene Glycol
Freon Refrigerants
Freon Solvents
(“MF”, “TF”, “BF”)
Fuel Oils and Diesel
Gasoline
Gas, Inert
Gas (natural and
manufactured)
Helium
Hydrogen
Jet Fuel (JP1 to JP6)
Kerosene
Methyl Alcohol (Methanol)
Naphtha
Nitrogen
Oils (coolant, hydraulic,
lubricating and motor)
Oxygen, Gaseous
Potassium Sulfate
Propane Gas and Liquid
“Pydraul” (“Monsanto”)
Steam
Steam Condensate
Stoddard Solvent
Toluene (Tolulo)
Vacuum
Vegetable Oil
Vinegar
Water, Fresh, Boiler Feed
Water (Distilled, Deionized,
Demineralized)
Water, Sea
Material Code 11YesYes400
12YesYes400
13YesYes400
16YesYes400
17YesYes400
21YesNo
3500
22YesNo
3500
23YesNo
3500
26YesNo
3500
27YesNo
3500
31YesYes8000
32YesYes8000
33YesYes8000
36YesYes8000
37YesYes8000
42YesYes8000
44NoNo400
71NoNo200
VacuumInches of WaterP.S.I.G. to R
ang
esA
vaila
ble
For high purity applications use stainless steel transducers.Notes: 1 Oxygen service requires special cleaning, specify suffix “H”.2 For steam service a condensate loop (pigtail) is required.3
For pressure transducers for combustion service see pages 20-23.4 Material availability refers to standard gauge pressure constructions only.5
5
1
2
3
4
4
PP
P
P
PP
P
P
P
PP
PPPP
P
PP
P
PP
S
S
S
SS
P
S
S
S
SS
SSSS
S
SS
PPS
S
P
SS
SPS
P
SS
S
S
S
SSPS
SS
S
SSSP
SPSS
S
S
SS
S
S
SS
S
S
PSS
SS
SS
S
S
SS
S
SS
S
S
S
S
S
S
S
S
S
S
S
S
S
SS
S
SS
S
SSS
S
SS
S
S
S
S
SSSS
SS
S
SSSSSSSSS
S
S
S
SS
S
S
SS
S
S
SSS
S
S
S
S
SS
S
SS
S
S
S
SS
S
S
S
S
S
S
S
S
S
S
S
SS
SSS
S
S
S
S
S
SS
S
S
S
S
SS
SSSS
S
SS
SSS
SS
S
P
SS
SSSPSPSS
S
S
S
S
SSSS
SS
S
SSSSSSSSSSSS
S
SS
S
SS
S
S
SS
S
S
SSS
SS
S
S SSS
S
S
SS
S
SS
S
S
S
SS
S
SS
S
S
S
S
S
S
S
S
S
S
SS
SSS
SSSS
S
SS
SSSPSPSS
S
S
S
S
SSS
SSS
S
SSSSSSSSSSSS
S
SP
SPSSSSSSSSP
S
SPS
S
SSSSSSS
S
SSSSSSSS
SPS
S
S
P
P
P
P
P
P
P
P
30
S-SERIES Temperature Switches
Features:• Set point repeatability, +1°F (1/2°C).• All wiring terminals, adjustments and visual scales
are accessible from the front of the switch.• Choice of general purpose, watertight or
explosion-proof enclosures.• Choice of fixed or full-range adjustable deadband.• Choice of single or two-stage units.• Manual reset units available.• Mounts in any position.• Rugged and vibration resistant.• Visual adjustment scales in °F and °C.• External adjusting nuts.• Separate temperature, electrical and adjusting
chambers.• Direct mount (local) or capillary and bulb (remote)
sensors.• Temperature transducers available with copper or
316 stainless steel wetted material.• Withstands high overrange temperatures.• Mix and match switch and transducer components for
increased stock flexibility or to change pressure ranges in field.
General Description:ASCO S-Series temperature switches consist of aswitch unit and a transducer unit. They can be ordered separately for customer stocking and/or field assemblyor as a complete factory-assembled unit.
SwitchS-Series temperature switch units incorporate theunique ASCO TRI-POINT alternating fulcrum balanceplate to control the operation of one or more electricalsnap-action swtiches. The electrical snap-action switchtogether with the adjusting mechanism is a fully-tested,self-contained subassembly.
TransducerThe temperature transducer unit uses a vapor pressureprinciple where the internal pressure within the unit isgenerated by the vapor pressure of a chemical within asealed system. Temperature transducers are availablein two constructions, a direct mount or capillary andbulb construction. The direct mount unit includes a 1/2”NPT connection for direct mounting to the process. Thecapillary and bulb construction allows remote mounting
Standard Electrical Ratings
Switches for -30 through 640°F with Adjustable Set Points,Fixed or Adjustable Deadband and General Purpose,Watertight or Explosion-Proof Enclosures
SA, SB, SC, SD and SE Series15 Amp Res., 125 VAC10 Amp Res., 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp Res., 125 VDC1/4 Amp Res., 250 VDC
^ %SPDT
NO
NC
C
Standard Temperature Ratings
Ambient: -4°F (-20°C) to 140°F (60°C)Fluid: See specification table on page 32
for rated overrange temperature.
from the process. The transducer unit (like the switchunit) is a fully-tested, self-contained subassembly.
OperationTemperature sensed by the bulb creates an internalpressure within the transducer. This pressure is thenconverted into movement of the piston. This pistonmovement is then used to control the operation of the electrical snap-action switch in the switch unit.
Options (See pages 34-35)
4 123
EnclosuresASCO TRI-POINT S-Series switches are available inthree standard enclosures. All of these enclosed unitsare made in accordance with NEMA and UL standards.
General Purpose – Type 1. These enclosures aredesigned for indoor use to protect personnel fromaccidental contact with the equipment. S-Series general purpose switch units consist of a copper-free*aluminum die-cast body with a formed copper-free* aluminum cover; two 3/4” conduit hubs with one plugare provided.
Watertight – Type 4. Watertight and dust-tight enclo-sures are intended for use indoors and outdoors to protect the enclosed equipment against splashing orfalling water, windblown dust and water, hose directedwater, and severe external condensation. S-Serieswatertight switch units have a copper-free* aluminumdie-cast body and a formed copper-free* aluminumcover with Buna “N” gaskets; two 3/4” conduit hubs with one plug are provided.
Explosion-Proof – Types 7 and 9. Type 7 enclosuresare intended for use in locations defined by the NationalElectrical Code as Class I. Type 9 enclosures areintended for Class II locations.
Class I locations are those in which flammable gasesare or may be present in the air in sufficient quantitiesto produce explosive or ignitable mixtures. Class Ilocations are classified by group letter, which definesparticular atmospheres. Division 1 locations are areaswhere the hazardous concentration exists continuously,intermittently or periodically under normal operatingconditions. Division 2 locations are those where thehazardous vapors are present only in case of acciden-tal rupture or breakdown of equipment.
ASCO TRI-POINT explosion-proof enclosures with letter B, C or D in the fifth position are listed for Class I,Groups B, C, and D, Division 1. They are also suitablefor the less stringent Division 2 environment.
Class II locations are those which are hazardousbecause of the presence of combustible dust. All ASCO TRI-POINT explosion-proof enclosures are listed for Groups E, F, and G locations.
The switch body and cover are die-cast copper-free*aluminum with a Buna “N” gasket. Two 3/4” conduithubs with one plug are provided.
Dimensions (inches)
* Less than 0.6% copper.
2.2
1.03
4.13.5
3.2
3.8
11.6
8.9
1.0
4.0
1.6 2.3
11/32 DIA. FORMOUNTING(2PLACES)
3/4 NPT FORCONDUIT CONN.BOTH ENDS
ADDITIONAL SPACE REQUIREDFOR REMOVAL OF COVER
1/2 NPT
3.8DIA.
S-SeriesTemperature
With Direct Mount Transducer With Capillary and Bulb Transducer
31
32 33
Two-Stage Fixed Deadband Transducer Units
S-SERIES Temperature Switches
How to OrderFactory assembled – Simplyorder the switch and transducerunit by catalog number joined by a slash (/), e.g., SA10D/QA10A1.Field assembled – Simply order the switch and transducerunits separately by individual catalog number, e.g., one SA10D and one QA10A1.Options – Add appropriatesuffix for desired option(see pages 34-35).
Important Note: The third digitof each of the catalog numbersmust be identical,e.g., SA 1 0D and QA 1 0A1.
How to Select and OrderASCO S-Series switches consist of two components, the switch unit and the transducer unit.
How to Select1. Select the adjustable operating range based on desired actuation temperature.2. Check that rated overrange temperature is sufficient.3. Read across and select the desired S-Series switch unit with the proper enclosure.4. Continue across and select a matching transducer unit compatible with the fluid.
Single-Stage Adjustable Deadbandunits allow independent adjustment ofthe set and reset points over the fulloperating range of the switch. Theminimum difference between set andreset points is thedeadband listedbelow; themaximumdifference is thefull range of theswitch .
SB Switch Unit: Single-Stage FixedDeadband units have an adjustable set pointand a non-adjustable automatic reset point.SD Switch Unit: Manual reset on decreasingtemperature units operate automatically onincreasing temperature and must be reset manually on decreasing temperature.(To order, change second digit to letter “D”,e.g., S B 40D becomes S D 40D).SE Switch Unit: Manual reset on increasingtemperature units operate automatically ondecreasing temperature and must be resetmanually on increasing temperature.(To order, change second digit to letter “E”,e.g., S B 40D becomes S E 40D).
SA Switch Unit SB, SD or SE Switch Unit SC Switch Unit
General Purpose
Specifications Adjustable Deadband Fixed Deadband or Manual Reset
All switch units above are in stock for immediate delivery.
Values shown are nominal.1
All switch units and transducer units above are in stock for immediate delivery.
AdjustableOperating
Range(°F)
RatedOverrange
Temperature (°F)
Minimum AtMid-Range
(°F)
AdjustableDeadband
MaximumFull Scale
CatalogNo.
DirectMount Copper SS
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.1
FixedDeadband
AtMid-Range
(°F) 1
FixedDeadband
AtMid-Range
(°F) 1
Minimum AtMid-Range
(°F)
Separation
MaximumFull Scale
1
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
250260260260260------------
250300350450500550550550550
250300350450500600700800890
88889
12121832
33333667
20
4444488
1027
88889
12121832
SA10DSA10DSA10DSA10DSA10DSA10DSA10DSA10DSA10D
SA11DSA11DSA11DSA11DSA11DSA11DSA11DSA11DSA11D
SA12DSA12DSA12DSA12DSA12DSA12DSA12DSA12DSA12D
SC10DSC10DSC10DSC10DSC10DSC10DSC10DSC10DSC10D
SC11DSC11DSC11DSC11DSC11DSC11DSC11DSC11DSC11D
SC12DSC12DSC12DSC12DSC12DSC12DSC12DSC12DSC12D
SB10DSB10DSB10DSB10DSB10DSB10DSB10DSB10DSB10D
SB11DSB11DSB11DSB11DSB11DSB11DSB11DSB11DSB11D
SB12DSB12DSB12DSB12DSB12DSB12DSB12DSB12DSB12D
CatalogNo.
316 SS
316 SS(Plain
Capillary)
Copper(ArmoredCapillary)
Copper(ArmoredCapillary)
316 SS &(Plain
Capillary)
CatalogNo.
CatalogNo.
QB10A4QD10A4QF10A4QJ10A4QL10A4
------------
CatalogNo.
QB11A1QD11A1QF11A1QJ11A1QL11A1QN11A1QT11A1QU11A1
---
CatalogNo.
QB11A4QD11A4QF11A4QJ11A4QL11A4QN11A4QT11A4QU11A4QW11A4
CatalogNo.
Copper
12’ Capillary and Bulb6’ Capillary and BulbDirect Mount
QB10A1QD10A1QF10A1QJ10A1QL10A1
------------
QB11A1DQD11A1DQF11A1DQJ11A1DQL11A1DQN11A1DQT11A1DQU11A1D
---
QB11A4DQD11A4DQF11A4DQJ11A4DQL11A4DQN11A4DQT11A4DQU11A4DQW11A4D
-30 - 600 - 90
50 - 160100 - 220160 - 260225 - 340300 - 450350 - 510425 - 640
Two-Stage Fixed Deadband units consist of twoseparate snap-action switches, each with anindependently adjustable set point and non-adjustablereset point. The difference between the set and resetpoints of each switch is thedeadband listed below; theminimum difference betweenthe set points of the twoswitches is the separation.
Explosion Proof
Select transducer unit below
Transducer Unit
The temperature transducer works on the vapor principle wherethe internal pressure within the system is generated by the vaporpressure of a chemical within a sealed system. The temperaturesensed by the bulb is related uniquely to an internal pressurewithin the system. The pressure acts on a diaphragm/piston tocreate the force output from the transducer into the switch unit.Temperature transducers are available in two constructions. Thedirect mount (local) unit includes a 1/2” NPT connection fordirect application to the process. The capillary and bulb-typeconstruction allows for remote mounting from the process.
Direct Mount1/2” NPT
Capillaryand Bulb
4 123
°C = (°F -32) x 5/9
Capillary
Select S-Series temperature switch SA, SB, SC, SD or SE unit below
32 33
Two-Stage Fixed Deadband Transducer Units
S-SERIES Temperature Switches
How to OrderFactory assembled – Simplyorder the switch and transducerunit by catalog number joined by a slash (/), e.g., SA10D/QA10A1.Field assembled – Simply order the switch and transducerunits separately by individual catalog number, e.g., one SA10D and one QA10A1.Options – Add appropriatesuffix for desired option(see pages 34-35).
Important Note: The third digitof each of the catalog numbersmust be identical,e.g., SA 1 0D and QA 1 0A1.
How to Select and OrderASCO S-Series switches consist of two components, the switch unit and the transducer unit.
How to Select1. Select the adjustable operating range based on desired actuation temperature.2. Check that rated overrange temperature is sufficient.3. Read across and select the desired S-Series switch unit with the proper enclosure.4. Continue across and select a matching transducer unit compatible with the fluid.
Single-Stage Adjustable Deadbandunits allow independent adjustment ofthe set and reset points over the fulloperating range of the switch. Theminimum difference between set andreset points is thedeadband listedbelow; themaximumdifference is thefull range of theswitch .
SB Switch Unit: Single-Stage FixedDeadband units have an adjustable set pointand a non-adjustable automatic reset point.SD Switch Unit: Manual reset on decreasingtemperature units operate automatically onincreasing temperature and must be reset manually on decreasing temperature.(To order, change second digit to letter “D”,e.g., S B 40D becomes S D 40D).SE Switch Unit: Manual reset on increasingtemperature units operate automatically ondecreasing temperature and must be resetmanually on increasing temperature.(To order, change second digit to letter “E”,e.g., S B 40D becomes S E 40D).
SA Switch Unit SB, SD or SE Switch Unit SC Switch Unit
General Purpose
Specifications Adjustable Deadband Fixed Deadband or Manual Reset
All switch units above are in stock for immediate delivery.
Values shown are nominal.1
All switch units and transducer units above are in stock for immediate delivery.
AdjustableOperating
Range(°F)
RatedOverrange
Temperature (°F)
Minimum AtMid-Range
(°F)
AdjustableDeadband
MaximumFull Scale
CatalogNo.
DirectMount Copper SS
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.1
FixedDeadband
AtMid-Range
(°F) 1
FixedDeadband
AtMid-Range
(°F) 1
Minimum AtMid-Range
(°F)
Separation
MaximumFull Scale
1
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
CatalogNo.
GeneralPurpose
WatertightEnclosure
Explosion-Proof
CatalogNo.
CatalogNo.
250260260260260------------
250300350450500550550550550
250300350450500600700800890
88889
12121832
33333667
20
4444488
1027
88889
12121832
SA10DSA10DSA10DSA10DSA10DSA10DSA10DSA10DSA10D
SA11DSA11DSA11DSA11DSA11DSA11DSA11DSA11DSA11D
SA12DSA12DSA12DSA12DSA12DSA12DSA12DSA12DSA12D
SC10DSC10DSC10DSC10DSC10DSC10DSC10DSC10DSC10D
SC11DSC11DSC11DSC11DSC11DSC11DSC11DSC11DSC11D
SC12DSC12DSC12DSC12DSC12DSC12DSC12DSC12DSC12D
SB10DSB10DSB10DSB10DSB10DSB10DSB10DSB10DSB10D
SB11DSB11DSB11DSB11DSB11DSB11DSB11DSB11DSB11D
SB12DSB12DSB12DSB12DSB12DSB12DSB12DSB12DSB12D
CatalogNo.
316 SS
316 SS(Plain
Capillary)
Copper(ArmoredCapillary)
Copper(ArmoredCapillary)
316 SS &(Plain
Capillary)
CatalogNo.
CatalogNo.
QB10A4QD10A4QF10A4QJ10A4QL10A4
------------
CatalogNo.
QB11A1QD11A1QF11A1QJ11A1QL11A1QN11A1QT11A1QU11A1
---
CatalogNo.
QB11A4QD11A4QF11A4QJ11A4QL11A4QN11A4QT11A4QU11A4QW11A4
CatalogNo.
Copper
12’ Capillary and Bulb6’ Capillary and BulbDirect Mount
QB10A1QD10A1QF10A1QJ10A1QL10A1
------------
QB11A1DQD11A1DQF11A1DQJ11A1DQL11A1DQN11A1DQT11A1DQU11A1D
---
QB11A4DQD11A4DQF11A4DQJ11A4DQL11A4DQN11A4DQT11A4DQU11A4DQW11A4D
-30 - 600 - 90
50 - 160100 - 220160 - 260225 - 340300 - 450350 - 510425 - 640
Two-Stage Fixed Deadband units consist of twoseparate snap-action switches, each with anindependently adjustable set point and non-adjustablereset point. The difference between the set and resetpoints of each switch is thedeadband listed below; theminimum difference betweenthe set points of the twoswitches is the separation.
Explosion Proof
Select transducer unit below
Transducer Unit
The temperature transducer works on the vapor principle wherethe internal pressure within the system is generated by the vaporpressure of a chemical within a sealed system. The temperaturesensed by the bulb is related uniquely to an internal pressurewithin the system. The pressure acts on a diaphragm/piston tocreate the force output from the transducer into the switch unit.Temperature transducers are available in two constructions. Thedirect mount (local) unit includes a 1/2” NPT connection fordirect application to the process. The capillary and bulb-typeconstruction allows for remote mounting from the process.
Direct Mount1/2” NPT
Capillaryand Bulb
4 123
°C = (°F -32) x 5/9
Capillary
Select S-Series temperature switch SA, SB, SC, SD or SE unit below
34
OPTIONS Pressure/Temperature Switches
H-Series, P-Series and S-SeriesSnap-Action Switch OptionsOptional snap-action switches to meet specific electrical loadsor application conditions are available on most ASCO TRI-POINTswitch units. Generally, the construction of a switch unit withoptional snap-action switches contains other specific parts andmay be ordered only as a factory-built unit. To specify a particularoptional construction, add the appropriate suffix to the switch unitcatalog number, e.g., SA10D with optional gold contact snap-action switch (suffix “P”) would become SA10D P .
P-SeriesSwitch OptionsPanel Mount – Open frame P-Series compact switch units areavailable for panel mounting with the switch unit inside and thetransducer outside. The panel separates the fluid sensing portionfrom the electromechanical portion. Five holes for bolts andoperating stem must be drilled or punched through the panel.Three constructions are available: add the suffix listed below tothe switch unit catalog number for the desired thickness.
S-SeriesSwitch OptionsIndustrial Adjusting Nut Covers –Available in clear plastic or metal toprevent tampering with set pointadjusting nuts.Clear plastic cover: To order, addsuffix “1” to the switch unit catalognumber, or order separately as SP01.Metal cover: To order, add suffix “2” tothe switch unit catalog number, ororder separately as SP02.JIC Construction – A switch unithaving the electrical and adjusting nutcovers attached to the switch body bya chain. Also designed to Type 13specifications. To order, add suffix “3”to the switch unit catalog number, ororder separately as SP03.Terminal Block – Applicable to switchunits with one single-poledouble-throwswitch. The terminal strip is prewiredto the snap-action switch. To order, addsuffix “4” to the switch unit catalognumber, or order separately as SP04.Factory Sealed – Explosion-proofunits may be ordered with a factoryseal separating the electrical chamberfrom the conduit hubs and 24” long#14 AWG 105°C. rated lead wires. Toorder, change the fourth digit of theswitch unit catalog number from “2” to“3”, e.g., SA1 2 D becomes SA1 3 D.
CatalogSuffix
Deadband VariationFrom ListingElectrical RatingDescription
SuffixPanel Thickness
10 Ga (.135+.005)14 Ga (.075+.005)16 Ga (.060+.005)
101112
5 Amp, 125, 250 VAC1/4 HP, 125 VAC1/2 HP, 250 VAC1 Amp, 125 VDC1/2 Amp, 250 VDC
10 Amp, 125 VAC, VDC1/8 HP, 125 VAC, VDC
5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC1 Amp, 28 VAC1 Amp, 28 VDC25 Amp Res, 28 VDC10 Amp Ind, 28 VDC5 Amp Motor, 28 VDC3 Amp Lamp, 28 VDC1 Amp, 125 VAC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC20 Amp, 125, 250 VAC1 HP, 125 VAC2 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC
SA: +50%SB, SC, PA: +100%
H: +200%PB: +400%SA: +50%
SB, SC, PA: +100%H: +120%
PB: +400%
SA, SB, SD, SE, PB: +50%
SA, SB, SC, PA: +25%H: +50%
PB, PC: +100% SA, PA: +100%
H: +200%PB: +600%
SA, SB, SC: +25%
SA: +50%SB, SC: +100%
PB: +400%
SA: NoneSB, SC, PA: +25%
PB, H: +50%
SB, SC: -50%
DC Rating1 Amp
Double Break
DC Rating10 Amps, SPDT
Double-poleDouble-throw(Two SPDT
Switches withCommon Lever)
Gold ContactDry Circuit SPDT
HermeticallySealedSPDT
High Ambient250°FSPDT
High Power1 HPSPDT
MoistureResistant
Sealed SwitchSPDT
TightFixed
DeadbandSPDT
G
M
K
P
H
F
W
J
T
35
4 123
Pressure Transducer Options
P-Series and S-Series Temperature Transducer Options
Special Wetted Materials – The following diaphragms maybe substituted on transducer body materials of aluminum,brass, polyester and stainless steel. To order, substitute thematerial code below in the seventh digit of the transducercatalog number, e.g., a TF10A1 1 with optional viton diaphragmbecomes a TF10A1 2 .
Oxygen Cleaning – Pressure transducers for oxygen serviceshould be specially cleaned. They are degreased and blacklightinspected, then assembled in a clean area and tested withoil-free air or nitrogen. Use metal body transducer with viton orneoprene diaphragm and add suffix “H” to transducer catalognumber, e.g., TA40A13 becomes TA40A13 H .
Pressure Snubbers – A pressure snubber (1/4” NPTF by1/4” NPTM) installed in the transducer pressure connectionwill dampen the pressure spikes to a value which will notcause damage. It consists of a body with a porous metal discof stainless steel through which the fluid passes. To order,select a snubber compatible with the fluid. Available byseperate catalog number only (see table below).
Process Connection – A female process connection (1/4”NPT) is standard on all pressure transducers. A 1/2” NPT isavailable as an option on gauge pressure transducers. Toorder, add suffix “B” to transducer catalog number, e.g.,RF10A21 becomes RF10A21 B .Note: Not available on nylon transducers.
Armored Capillaries – Double braided copper armor isstandard for copper capillary units. Stainless steel spiralinterlocked armor is available for stainless steel capillaryunits. Add suffix “C” to transducer catalog number.
Thermal Well – Use with direct or remote sensors for protecting sensing bulb. This allows removal of bulb while maintaining a pressure-tight vessel. Available in 1/2” NPT or 3/4”NPT process connection in brass or 316 SS. Dimensions are inaccordance with SAMA Std. RC17-9. Standard “U” dimension(insertion length) is 2-1/2” for direct mount and 6’ capillary unitsand is 4-1/2” for 12’ capillary units.
Longer Capillaries – Standard copper and stainless steelcapillary units can be furnished in 12’ lengths. To order, addsuffix “D” to transducer catalog number. Consult ASCO for longer length capillaries.
Union Connector – For use with remote units for mountingof bulb in fluid being controlled. Available in 1/2” NPT and3/4” NPT process connections in brass or 316 SS.
MaterialCodeDiaphragm Temperature Range
Buna “N”Ethylene Propylene
NeopreneFluorosilicone
Viton
-4°F (-20°C) to 180°F (82°C)-4°F (-20°C) to 250°F (121°C)-4°F (-20°C) to 180°F (82°C)-40°F (-40°C) to 250°F (121°C)-4°F (-20°C) to 250°F (121°C)
16372
BrassCatalog No.
303 SSCatalog No.Fluid
Air, Non-Hazardous GasesWater, Light Oil (under 225 SSU)
Oil (Heavy, (over 225 SSU)Pressure Rating (psig)
TP04G3TP04E3TP04D3
5000
TP04G2TP04E2TP04D2
2000
BulbLength(Inches)
TransducerSuffix
“U” DimensionRequired(Inches)
CapillaryLength(Feet)
612
13 - 2021 - 5051 - 80
3-1/25-1/25-1/28-1/2
11-1/2
2-1/24-1/24-1/27-1/2
10-1/2
---DEFG
PressureRating(psig) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass316 SS
QP01QP05
QP02---
5001500
PressureRating(psig)
“U”Dimensions
(Inches) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass
316 SS
QP03QP13QP23QP33QP07QP17QP27QP37
QP04QP14QP24QP34QP08QP18QP28QP38
1000
6000
2-1/24-1/27-1/2
10-1/22-1/24-1/27-1/2
10-1/2
Thermal Well
Jam nuts provided with thermal wells.1
1
14
S-SERIES Pressure Switches
Features:• Set point repeatability, +1% of operating range.• All wiring terminals, adjustments and visual scales are
accessible from the front of the switch.• Choice of general purpose, watertight or explosion-
proof enclosures.• Choice of fixed or full-range adjustable deadband.• Choice of single or two-stage units.• Manual reset units available.• Mounts in any position.• Rugged and vibration resistant.• Visual adjustment scales in psi and bars.• External adjusting nuts.• Separate electrical, pressure and adjusting
chambers.• Wide selection of transducer wetted materials suitable for air, water, oil or corrosive fluids.• Mix and match switch and transducer components for
increased stock flexibility or to change pressure ranges in field.
General Description:ASCO S-Series pressure switches consist of a switchunit and a transducer unit. They can be ordered separately for customer stocking and/or field assemblyor as a complete factory-assembled unit.
SwitchS-Series pressure switch units incorporate the uniqueASCO TRI-POINT alternating fulcrum balance plate tocontrol the operation of one or more electrical snap-action swtiches. The electrical snap-action switchtogether with the adjusting mechanism is a fully-tested,self-contained subassembly.
TransducerTransducer unit incorporates a diaphragm/piston type pressure sensor, and is also a fully-tested, self-contained subassembly.
OperationWhen pressure is applied to the transducer it is converted into movement of the piston. This pistonmovement is then used to control the operation of the electrical snap-action switch in the switch unit.
Standard Electrical Ratings
Switches for Pressure to 8000 psig, Vacuum, or Differentialwith General Purpose, Watertight orExplosion-Proof Enclosures
SA, SB, SC, SD and SE Series15 Amp Res., 125 VAC10 Amp Res., 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp Res., 125 VDC1/4 Amp Res., 250 VDC
^ %
SPDTNO
NC
C
Standard Temperature Ratings
Ambient: -4°F (-20°C) to 140°F (60°C)Fluid: For Buna “N” or Neoprene Diaphragm
-4°F (-20°C) to 180°F (82°C)For Viton Diaphragm-4°F (-20°C) to 250°F (121°C)For 316 SS Diaphragm-50°F (-45°C) to 300°F (149°C)
Options (See pages 34-35)
4 123
EnclosuresASCO TRI-POINT S-Series switches are available inthree standard enclosures. All of these enclosed unitsare made in accordance with NEMA and UL standards.
General Purpose – Type 1. These enclosures aredesigned for indoor use to protect personnel fromaccidental contact with the equipment. S-Series general purpose switch units consist of a copper-free*aluminum die-cast body with a formed copper-free* aluminum cover; two 3/4” conduit hubs with one plugare provided.
Watertight – Type 4. Watertight and dust-tight enclo-sures are intended for use indoors and outdoors to protect the enclosed equipment against splashing orfalling water, windblown dust and water, hose directedwater, and severe external condensation. S-Serieswatertight switch units have a copper-free* aluminumdie-cast body and a formed copper-free* aluminumcover with Buna “N” gaskets; two 3/4” conduit hubs with one plug are provided.
Explosion-Proof – Types 7 and 9. Type 7 enclosuresare intended for use in locations defined by the NationalElectrical Code as Class I. Type 9 enclosures areintended for Class II locations.
Class I locations are those in which flammable gasesare or may be present in the air in sufficient quantitiesto produce explosive or ignitable mixtures. Class I loca-tions are classified by group letter, which defines partic-ular atmospheres. Division 1 locations are areas wherethe hazardous concentration exists continuously, inter-mittently or periodically under normal operating condi-tions. Division 2 locations are those where the haz-ardous vapors are present only in case of accidentalrupture or breakdown of equipment.
ASCO TRI-POINT explosion-proof enclosures with letter B, C or D in the fifth position are listed for Class I,Groups B, C, and D, Division 1. They are also suitablefor the less stringent Division 2 environment.
Class II locations are those which are hazardousbecause of the presence of combustible dust. All ASCO TRI-POINT explosion-proof enclosures are listed for Groups E, F, and G locations.
The switch body and cover are die-cast copper-free*aluminum with a Buna “N” gasket. Two 3/4” conduithubs with one plug are provided.
Dimensions (inches)
* Less than 0.6% copper.
2.2
4.06
1.03
3.5
3.2
3.7
7.5 1 1.0
4.3 1
1.6 2.32.3
11/32 DIA. FORMOUNTING(2PLACES)
3/4 NPT FORCONDUIT CONN.BOTH ENDS
ADDITIONAL SPACE REQUIREDFOR REMOVAL OF COVER
1/4 OR 1/2 NPT
1 ON TV SERIES ADD 7/16" TO THESE DIMENSIONS3.2
7.0
2.9
1.7
4.1
1.0
7.4
1.6
3.5
2.3
7.0
1.03
1.5
2.2
3.7
1/4 NPT
11/32 DIA. FORMOUNTING(2PLACES)
3/4 NPT FORCONDUIT CONN.BOTH ENDS
ADDITIONAL SPACE REQUIREDFOR REMOVAL OF COVER
1/4 NPT VENT CONNECTION ONDOUBLE CHAMBER TRANSDUCERS
S-Series Pressure
With Types TD - TV Transducers With Types TA - TC Transducers
15
Two-Stage Fixed Deadband Transducer Units
18
S-SERIES Vacuum, Differential Switches
How to Select1. Select the adjustable operating range based on desired actuation point.2. Check that proof pressure is sufficient.3. Read across and select thedesired S-Series switch unit with the proper enclosure.4. Continue across and select a matching transducer unit compatible with the fluid.
How to OrderFactory assembled – Simplyorder the switch and transducerunit by catalog number joined by a slash (/), e.g., SA30D/TA34A11.Field assembled – Simplyorder the switch and transducerunits separately by individual catalog number, e.g., one SA30D and one TA34A11.
How to Select and OrderASCO S-Series switches consist of two components, the switch unit and the transducer unit.
Single-Stage Adjustable Deadbandunits allow independent adjustment ofthe set and reset points over the fulloperating range of the switch. Theminimum differencebetween set andreset points is thedeadband listedbelow; the maximumdifference is the fullrange of the switch .
SB Switch Unit: Single-Stage FixedDeadband units have an adjustable setpoint and a non-adjustable automatic reset point.SD Switch Unit: Manual reset on decreas-ing pressure units operate automatically on increasing pressure and must be reset manually on decreasing pressure.(To order, change second digit to letter “D”,e.g., S B 30D becomes S D 30D).SE Switch Unit: Manual reset on increas-ing pressure units operate automatically ondecreasing pressure and must be reset manually on increasing pressure.(To order, change second digit to letter “E”,e.g., S B 30D becomes S E 30D).
SA Switch Unit SB, SD or SE Switch Unit SC Switch Unit
General Purpose
Specifications Adjustable Deadband Fixed Deadband or Manual Reset
All switch units above are in stock for immediate delivery.
Values shown are nominal.1
All switch units and transducer units above are in stock for immediate delivery.
AdjustableOperating
Range(In W.C.)
AdjustableDeadband
AtMid-Range
(In W.C.)From/To
ProofPressure
(psig)Catalog
No.
GeneralPurpose Watertight
Explosion-Proof
CatalogNo.
CatalogNo.
FixedDeadband
AtMid-Range
(In W.C.) 1
1
FixedDeadband
AtMid-Range
(In W.C.) 1
Minimum AtMid-Range
(In W.C.)
Separation
MaximumFull Scale
1
CatalogNo.
GeneralPurpose Watertight
Explosion-Proof
CatalogNo.
CatalogNo.
CatalogNo.
GeneralPurpose Watertight
Explosion-Proof
CatalogNo.
CatalogNo.
50501515252525
151515252525
0 - 30” Hg15 PSI - 30” Hg
0 - 270 - 65
15 - 14015 - 25025 - 400
0 - 120 - 270 - 65
15 - 14015 - 25025 - 400
2 - 28” Hg3 - 57” Hg
1.2” Hg1.7” Hg
1.21.43.06.08.0
1.01.21.43.06.08.0
1.7” Hg2.0” Hg
1.72.04.07.0
13.0
1.41.72.04.07.0
13.0
3” Hg8” Hg
2.76.5
14.025.040.0
2.42.76.5
14.025.040.0
SA30DSA20DSA30DSA20DSA20DSA10DSA10D
SA40DSA30DSA20DSA20DSA10DSA10D
SA31DSA21DSA31DSA21DSA21DSA11DSA11D
SA41DSA31DSA21DSA21DSA11DSA11D
SA32DSA22DSA32DSA22DSA22DSA12DSA12D
SA42DSA32DSA22DSA22DSA12DSA12D
SC30DSC20DSC30DSC20DSC20DSC10DSC10D
SC40DSC30DSC20DSC20DSC10DSC10D
SC31DSC21DSC31DSC21DSC21DSC11DSC11D
SC41DSC31DSC21DSC21DSC11DSC11D
SC32DSC22DSC32DSC22DSC22DSC12DSC12D
SC42DSC32DSC22DSC22DSC12DSC12D
SB30DSB20DSB30DSB20DSB20DSB10DSB10D
SB40DSB30DSB20DSB20DSB10DSB10D
SB31DSB21DSB31DSB21DSB21DSB11DSB11D
SB41DSB31DSB21DSB21DSB11DSB11D
SB32DSB22DSB32DSB22DSB22DSB12DSB12D
SB42DSB32DSB22DSB22DSB12DSB12D
CatalogNo.
Brass &Buna “N”
303 SS &Viton
CatalogNo.
TV34A21TV24A21
---------------
------------------
CatalogNo.
Aluminum &Buna “N”
Water, AirOil or Gas
CorrosiveFluids
Air or Gas
TV34A11TV24A11TA31A11TA21A11TB21A11TB11A11TC11A11
TA41A11TA31A11TA21A11TB21A11TB11A11TC11A11
TV34A32TV24A32
---------------
------------------
Two-Stage Fixed Deadbandunits consist of two separate snap-action switches,each with an independently adjustable set point andnon-adjustable reset point. Thedifference between the set andreset points of each switch is thedeadband listed below; theminimum difference between theset points of the two switches isthe separation.
Explosion Proof
Select transducer unit below
The vacuum transducer has aspring which preloads the switchunit when no vacuum is applied.On application, the vacuum actson a piston area to overcome thespring to operate the switch unit. Vacuum Transducer
Options – Add appropriate suffix for desired option(see pages 34-35).Important Note: The third digit of each of the catalognumbers must be identical, e.g., SA 3 0D and TA 3 4A11.
4 123
Differential Pressure Transducer
The differential pressure transducer has two pressuresources acting on the piston area inopposite directions. The forceoutput is proportional to thedifference between thesepressures, allowing thedifferential pressure to becontolled by adjustmentof the switch unit.
2 - 273 - 656 - 125
10 - 23515 - 375
2 - 122 - 273 - 656 - 125
10 - 23515 - 375
Vacuum
Differential
19
Select S-Series pressure switch SA, SB, SC, SD and SE unit below
34
OPTIONS Pressure/Temperature Switches
H-Series, P-Series and S-SeriesSnap-Action Switch OptionsOptional snap-action switches to meet specific electrical loadsor application conditions are available on most ASCO TRI-POINTswitch units. Generally, the construction of a switch unit withoptional snap-action switches contains other specific parts andmay be ordered only as a factory-built unit. To specify a particularoptional construction, add the appropriate suffix to the switch unitcatalog number, e.g., SA10D with optional gold contact snap-action switch (suffix “P”) would become SA10D P .
P-SeriesSwitch OptionsPanel Mount – Open frame P-Series compact switch units areavailable for panel mounting with the switch unit inside and thetransducer outside. The panel separates the fluid sensing portionfrom the electromechanical portion. Five holes for bolts andoperating stem must be drilled or punched through the panel.Three constructions are available: add the suffix listed below tothe switch unit catalog number for the desired thickness.
S-SeriesSwitch OptionsIndustrial Adjusting Nut Covers –Available in clear plastic or metal toprevent tampering with set pointadjusting nuts.Clear plastic cover: To order, addsuffix “1” to the switch unit catalognumber, or order separately as SP01.Metal cover: To order, add suffix “2” tothe switch unit catalog number, ororder separately as SP02.JIC Construction – A switch unithaving the electrical and adjusting nutcovers attached to the switch body bya chain. Also designed to Type 13specifications. To order, add suffix “3”to the switch unit catalog number, ororder separately as SP03.Terminal Block – Applicable to switchunits with one single-poledouble-throwswitch. The terminal strip is prewiredto the snap-action switch. To order, addsuffix “4” to the switch unit catalognumber, or order separately as SP04.Factory Sealed – Explosion-proofunits may be ordered with a factoryseal separating the electrical chamberfrom the conduit hubs and 24” long#14 AWG 105°C. rated lead wires. Toorder, change the fourth digit of theswitch unit catalog number from “2” to“3”, e.g., SA1 2 D becomes SA1 3 D.
CatalogSuffix
Deadband VariationFrom ListingElectrical RatingDescription
SuffixPanel Thickness
10 Ga (.135+.005)14 Ga (.075+.005)16 Ga (.060+.005)
101112
5 Amp, 125, 250 VAC1/4 HP, 125 VAC1/2 HP, 250 VAC1 Amp, 125 VDC1/2 Amp, 250 VDC
10 Amp, 125 VAC, VDC1/8 HP, 125 VAC, VDC
5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC1 Amp, 28 VAC1 Amp, 28 VDC25 Amp Res, 28 VDC10 Amp Ind, 28 VDC5 Amp Motor, 28 VDC3 Amp Lamp, 28 VDC1 Amp, 125 VAC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC20 Amp, 125, 250 VAC1 HP, 125 VAC2 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC1/4 Amp, 250 VDC5 Amp, 125, 250 VAC1/8 HP, 125 VAC1/4 HP, 250 VAC1/2 Amp, 125 VDC
SA: +50%SB, SC, PA: +100%
H: +200%PB: +400%SA: +50%
SB, SC, PA: +100%H: +120%
PB: +400%
SA, SB, SD, SE, PB: +50%
SA, SB, SC, PA: +25%H: +50%
PB, PC: +100% SA, PA: +100%
H: +200%PB: +600%
SA, SB, SC: +25%
SA: +50%SB, SC: +100%
PB: +400%
SA: NoneSB, SC, PA: +25%
PB, H: +50%
SB, SC: -50%
DC Rating1 Amp
Double Break
DC Rating10 Amps, SPDT
Double-poleDouble-throw(Two SPDT
Switches withCommon Lever)
Gold ContactDry Circuit SPDT
HermeticallySealedSPDT
High Ambient250°FSPDT
High Power1 HPSPDT
MoistureResistant
Sealed SwitchSPDT
TightFixed
DeadbandSPDT
G
M
K
P
H
F
W
J
T
35
4 123
Pressure Transducer Options
P-Series and S-Series Temperature Transducer Options
Special Wetted Materials – The following diaphragms maybe substituted on transducer body materials of aluminum,brass, polyester and stainless steel. To order, substitute thematerial code below in the seventh digit of the transducercatalog number, e.g., a TF10A1 1 with optional viton diaphragmbecomes a TF10A1 2 .
Oxygen Cleaning – Pressure transducers for oxygen serviceshould be specially cleaned. They are degreased and blacklightinspected, then assembled in a clean area and tested withoil-free air or nitrogen. Use metal body transducer with viton orneoprene diaphragm and add suffix “H” to transducer catalognumber, e.g., TA40A13 becomes TA40A13 H .
Pressure Snubbers – A pressure snubber (1/4” NPTF by1/4” NPTM) installed in the transducer pressure connectionwill dampen the pressure spikes to a value which will notcause damage. It consists of a body with a porous metal discof stainless steel through which the fluid passes. To order,select a snubber compatible with the fluid. Available byseperate catalog number only (see table below).
Process Connection – A female process connection (1/4”NPT) is standard on all pressure transducers. A 1/2” NPT isavailable as an option on gauge pressure transducers. Toorder, add suffix “B” to transducer catalog number, e.g.,RF10A21 becomes RF10A21 B .Note: Not available on nylon transducers.
Armored Capillaries – Double braided copper armor isstandard for copper capillary units. Stainless steel spiralinterlocked armor is available for stainless steel capillaryunits. Add suffix “C” to transducer catalog number.
Thermal Well – Use with direct or remote sensors for protecting sensing bulb. This allows removal of bulb while maintaining a pressure-tight vessel. Available in 1/2” NPT or 3/4”NPT process connection in brass or 316 SS. Dimensions are inaccordance with SAMA Std. RC17-9. Standard “U” dimension(insertion length) is 2-1/2” for direct mount and 6’ capillary unitsand is 4-1/2” for 12’ capillary units.
Longer Capillaries – Standard copper and stainless steelcapillary units can be furnished in 12’ lengths. To order, addsuffix “D” to transducer catalog number. Consult ASCO for longer length capillaries.
Union Connector – For use with remote units for mountingof bulb in fluid being controlled. Available in 1/2” NPT and3/4” NPT process connections in brass or 316 SS.
MaterialCodeDiaphragm Temperature Range
Buna “N”Ethylene Propylene
NeopreneFluorosilicone
Viton
-4°F (-20°C) to 180°F (82°C)-4°F (-20°C) to 250°F (121°C)-4°F (-20°C) to 180°F (82°C)-40°F (-40°C) to 250°F (121°C)-4°F (-20°C) to 250°F (121°C)
16372
BrassCatalog No.
303 SSCatalog No.Fluid
Air, Non-Hazardous GasesWater, Light Oil (under 225 SSU)
Oil (Heavy, (over 225 SSU)Pressure Rating (psig)
TP04G3TP04E3TP04D3
5000
TP04G2TP04E2TP04D2
2000
BulbLength(Inches)
TransducerSuffix
“U” DimensionRequired(Inches)
CapillaryLength(Feet)
612
13 - 2021 - 5051 - 80
3-1/25-1/25-1/28-1/2
11-1/2
2-1/24-1/24-1/27-1/2
10-1/2
---DEFG
PressureRating(psig) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass316 SS
QP01QP05
QP02---
5001500
PressureRating(psig)
“U”Dimensions
(Inches) Catalog No. Catalog No.
3/4” NPT1/2” NPT
Process Connection
Material
Brass
316 SS
QP03QP13QP23QP33QP07QP17QP27QP37
QP04QP14QP24QP34QP08QP18QP28QP38
1000
6000
2-1/24-1/27-1/2
10-1/22-1/24-1/27-1/2
10-1/2
Thermal Well
Jam nuts provided with thermal wells.1
1
Switch Unit – ASCO uses the term “switch unit” to describethe electromechanical portion of a pressure or temperatureswitch. This is used in conjunction with a transducer unit toform a complete pressure or temperature switch.
Transducer Unit – ASCO uses the term “transducer unit” todescribe that portion of a pressure or temperature switch towhich a pressure or temperature is applied which convertsthe input signal to another form of energy to operate theswitch unit.
Two-Stage (Dual) – ASCO uses the term “two stage” todescribe a pressure or temperature switch which is equivalentto two pressure or temperature switches which areindependently adjustable. This switch is equivalent to twofixed deadband switches.
Deadbands – The deadband is the difference between theset point and reset point readings. Deadbands are listedin the specification tables at nominal values. They are representative of the deadbands of the units at the middleof the range.
The deadband values for the full range adjustable deadbandswitches and limited adjustable deadband switches indicatethe values through which the deadband may be adjusted.
Generally, as the set point is adjusted through the operatingrange, the deadband will vary. Normally, it will becomenarrower as the set point is towards the bottom of the range,and will become wider when the set point is towards the topof the range. The graph shown below indicates representativetrends of this type of deadband variation.
Temperature switch deadbands are a result of the characteris-tics of the vapor pressure curve as well as other factors.Normally, this results in a deadband which is narrower in thetop third of the range than in the bottom third of the range.The values published are nominal and representative of mid-range set points.
36
Definitions and Fluid Compatibility Guide
Accuracy – The maximum deviation from the set pointunder specified operating condition (ambient temperature,barometric pressure, etc.).
Adjustable Deadband – Refers to the capability of apressure or temperature switch to allow the deadband to beadjusted over a given range. Certain ASCO TRI-POINTswitches have an adjustable deadband which can beadjusted over the total operating range of the switch.
Adjustable Operating Range – The pressure or tempera-ture range of the switch within which the set point may beadjusted.
Differential Pressure – The difference between twopressures. A differential pressure switch senses two pressuresources and can be adjusted to actuate on a desireddifference between them.
Guage Pressure – The actual reading of a typical pressureguage and is the difference between the pressure within avessel and the atmospheric pressure surrounding it. It isnormally measured in pounds per square inch (psig).
Manual Reset – The switch is a semi-automatic devicewhich operates automatically with a signal change in onedirection but must be manually reset once the signal returnsto its original position.
Proof Pressure – A pressure which a device can besubjected to for extended periods of time without changesin its operating characteristics.
Rated Overrange Temperature – A temperature which adevice can be subjected to for extended periods of timewithout changes in its operating characteristics.
Repeatability – The closeness of agreement among anumber of consecutive measurements of the output for thesame value of input under the same operating conditionsapproaching from the same direction. Repeatability isnormally specified as a percentage of the upper limit of theoperating range.
Example: Operating range 5-100 psig with +1%repeatability; equals +1% of 100 psig or +1 psig.
Reset Point – After a pressure or temperature switch hasreached its set point and operated the electrical switch, itmust return to a point called the reset point before theelectrical switch can return to its original position.
Set Point – The pressure reading at which the electricalswitch element changes contact position (it can be specifiedeither increasing or decreasing).
Definitions
Deadbands
1.5 x CatalogValue
CatalogValue
Half CatalogValue
Bottom Mid Top
Position of Set Point in Range
37
4 123
These recommendations are to be used as a guide only, as servicelife of material is dependent on temperature, concentrations, orcatalysts that may be added and other conditions which arebeyond our control.Consult ASCO for specific service applications.
Note: Items in black circles are standard catalog units.All others available on factory order.
P - Indicates preferred construction. S - Indicates satisfactory construction.
Transducer Material Code of Two Digits represents process connectionmaterial and diaphragm material, respectively; these are the sixth andseventh positions of the pressure transducer catalog number.
Process Connection: 6th Position Diaphragm: 7th Position
1 Aluminum 4 316 S.S. 1 Buna “N” 4 316 S.S.2 Brass 7 Nylon/Brass 2 Viton 6 Ethylene Propylene3 303 S.S. 3 Neoprene 7 Fluorosilicone
Fluid Compatibility Guide
Acetic Acid
Acetylene
Air
Ammonia
Argon-Welding
Benzene-Benzol
Butane
Carbon Tetrachloride
Cellulube
Coke Oven Gas
Ethyl Alcohol (denatured)
Ethylene Glycol
Freon Refrigerants
Freon Solvents
(“MF”, “TF”, “BF”)
Fuel Oils and Diesel
Gasoline
Gas, Inert
Gas (natural and
manufactured)
Helium
Hydrogen
Jet Fuel (JP1 to JP6)
Kerosene
Methyl Alcohol (Methanol)
Naphtha
Nitrogen
Oils (coolant, hydraulic,
lubricating and motor)
Oxygen, Gaseous
Potassium Sulfate
Propane Gas and Liquid
“Pydraul” (“Monsanto”)
Steam
Steam Condensate
Stoddard Solvent
Toluene (Tolulo)
Vacuum
Vegetable Oil
Vinegar
Water, Fresh, Boiler Feed
Water (Distilled, Deionized,
Demineralized)
Water, Sea
Material Code 11YesYes400
12YesYes400
13YesYes400
16YesYes400
17YesYes400
21YesNo
3500
22YesNo
3500
23YesNo
3500
26YesNo
3500
27YesNo
3500
31YesYes8000
32YesYes8000
33YesYes8000
36YesYes8000
37YesYes8000
42YesYes8000
44NoNo400
71NoNo200
VacuumInches of WaterP.S.I.G. to R
ang
esA
vaila
ble
For high purity applications use stainless steel transducers.Notes: 1 Oxygen service requires special cleaning, specify suffix “H”.2 For steam service a condensate loop (pigtail) is required.3
For pressure transducers for combustion service see pages 20-23.4 Material availability refers to standard gauge pressure constructions only.5
5
1
2
3
4
4
PP
P
P
PP
P
P
P
PP
PPPP
P
PP
P
PP
S
S
S
SS
P
S
S
S
SS
SSSS
S
SS
PPS
S
P
SS
SPS
P
SS
S
S
S
SSPS
SS
S
SSSP
SPSS
S
S
SS
S
S
SS
S
S
PSS
SS
SS
S
S
SS
S
SS
S
S
S
S
S
S
S
S
S
S
S
S
S
SS
S
SS
S
SSS
S
SS
S
S
S
S
SSSS
SS
S
SSSSSSSSS
S
S
S
SS
S
S
SS
S
S
SSS
S
S
S
S
SS
S
SS
S
S
S
SS
S
S
S
S
S
S
S
S
S
S
S
SS
SSS
S
S
S
S
S
SS
S
S
S
S
SS
SSSS
S
SS
SSS
SS
S
P
SS
SSSPSPSS
S
S
S
S
SSSS
SS
S
SSSSSSSSSSSS
S
SS
S
SS
S
S
SS
S
S
SSS
SS
S
S SSS
S
S
SS
S
SS
S
S
S
SS
S
SS
S
S
S
S
S
S
S
S
S
S
SS
SSS
SSSS
S
SS
SSSPSPSS
S
S
S
S
SSS
SSS
S
SSSSSSSSSSSS
S
SP
SPSSSSSSSSP
S
SPS
S
SSSSSSS
S
SSSSSSSS
SPS
S
S
P
P
P
P
P
P
P
P