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Fisher� C1 Pneumatic Controllers andTransmittersFisher C1 controllers and transmitters continue thetradition of durable and dependable Fisher pressureinstrumentation while addressing air/gasconsumption concerns. The C1 is used whereverdurable and dependable pressure instrumentation isrequired. The use of this product in demandingapplications, such as those found in chemicalprocess, gas, and oil production industries,demonstrates its versatility. The C1 can reducesteady−state air/gas consumption to as little as1/10th that of previous products.
C1 controllers, shown in figure 1, compare sensedprocess pressure (or differential pressure) with anoperator−adjusted set point, and send a pneumaticsignal to an adjacent control element that maintainsthe process pressure at or near the set point value.C1 transmitters sense process variables and sendout a pneumatic signal, usually to an indicating orrecording device that directly indicates the processmeasurement.
Unless otherwise noted, all NACE references are toNACE MR0175−2002.
Features
� Wide Range of Sensing Elements—ABourdon tube is available for high pressures orbellows for vacuum and low pressures. Either kind ofsensing element can be installed in the case with thecontroller or transmitter. Two interchangeableranges of output bellows and gauges also areavailable.
� Reduced Air/Gas Consumption—The C1pneumatic controller is an energy efficient choice,helping to improve profits and uptime.
� Sour Service Capability—Materials areavailable for applications handling sour processfluids. These constructions comply with themetallurgical requirements of NACE MR0175−2002.Environmental restrictions may apply.
W9263−1
Figure 1. Fisher C1 Pneumatic Controller Yoke−Mounted on Control Valve Actuator
� Mounting Versatility—Install the case on apanel, wall or pipestand, as well as directly on thecontrol valve actuator.
� Reduced Maintenance Costs—A spring−outcleaning wire, shown in figure 5, provides forin−service cleaning of the relay orifice.
� Proportional−Only,Proportional−Plus−Reset, and Differential GapConfigurable—The C1 controller can be configuredto provide various modes of control.
� Field Reversible—Switch action from direct toreverse or vice versa without additional parts. Asillustrated in figure 4, transfer the reversing block tothe opposite side of the flapper, invert theproportional band assembly and change thefeedback bellows tubing connections.
(Features continued on page 3)
Product Bulletin34.3:C1D103291X012May 2010 C1 Controllers and Transmitters
C1 Controllers and TransmittersProduct Bulletin
34.3:C1May 2010
2
SpecificationsAvailable Configurations
See table 1
Input Signal
Pressure
Type: � Gauge pressure, � vacuum,� compound pressure, or � differential pressureof a liquid or gasLimits: See table 2 or 3
Output Signal
Proportional or Proportional−Plus−ResetControllers and Transmitters: � 0.2 to 1.0 bar(3 to 15 psig) or � 0.4 to 2.0 bar (6 to 30 psig)pneumatic pressure signalDifferential Gap Controllers: � 0 and 1.4 bar (0 and 20 psig) or � 0 and 2.4 bar (0 and 35 psig)pneumatic pressure signalAction: Control action is field reversible between� direct (increasing sensed pressure producesincreasing output signal) and � reverse(increasing sensed pressure produces decreasingoutput signal).
Supply Pressure Requirements(1)
See table 4
Supply Pressure Medium
Air or natural gas
Air Quality: Supply pressure must be clean, dryair that meets the requirements of ISA Standard7.0.01. A maximum 40 micrometer particle size inthe air system is acceptable. Further filtrationdown to 5 micrometer particle size isrecommended. Lubricant content is not to exceed1 ppm weight (w/w) or volume (v/v) basis.Condensation in the air supply should beminimized
Natural Gas: Natural gas must be clean, dry,oil−free, and noncorrosive. H2S content shouldnot exceed 20 ppm.
Steady−State Air Consumption(2,3)
0.2 to 1.0 bar (3 to 15 psig): 0.08 normal m3/hour (3 scfh)0.4 to 2.0 bar (6 to 30 psig): 0.12 normal m3/hour(4.5 scfh)
Supply and Output Connections
1/4 NPT internal
Supply and Output Pressure Gauge Ranges
See table 5
Proportional Band Adjustment
For Proportional−Only Controllers: Full outputpressure change adjustable from � 2% to 100%of the sensing element range for 0.2 to 1.0 bar (3to 15 psig) or � 4% to 100% of the sensingelement range for 0.4 to 2.0 bar (6 to 30 psig)
For Proportional−Plus−Reset Controllers: Fulloutput pressure change adjustable from � 3% to100% of the sensing element range for 0.2 to 1.0bar (3 to 15 psig), or � 6% to 100% of thesensing element range for 0.4 to 2.0 bar (6 to 30psig)
Differential Gap Adjustment
For Differential Gap Controllers: Full outputpressure change adjustable from 15% to 100% ofsensing element range
Reset Adjustment
For Proportional−Plus−Reset Controllers:Adjustable from 0.01 to 74 minutes per repeat(100 to 0.01 repeats per minute)
Zero Adjustment (Transmitters Only)
Continuously adjustable to position span of lessthan 100% anywhere within the sensing elementrange
Span Adjustment (Transmitters Only)
Full output pressure change adjustable from 6 to100% of process sensing element range
Performance
Repeatability: 0.5% of sensing element rangeDead Band (Except Differential GapControllers(4)): 0.1% of sensing element rangeTypical Frequency Response at 100%Proportional Band.Output to Actuator: 0.7 Hz and 110 degree phaseshift with 1850 cm3 (113 inches3) volume actuatorat mid−strokeOutput to Positioner Bellows: 9 Hz and 130degree phase shift with 0.2 to 1.0 bar (3 to 15psig) output to 33 cm3 ( 2 inches3 ) bellows
−continued−
C1 Controllers and TransmittersProduct Bulletin34.3:C1May 2010
3
Specifications (continued)Ambient Operating Temperature Limits(1)
� Standard Construction: −40 to 71�C (−40 to160�F) � High Temperature Construction: −18to 104�C (0 to 220�F)
Anti−reset windup (differential pressure relief) andprocess pressure gauge options are onlyavailable in the standard construction
Typical Ambient Temperature OperatingInfluence
Proportional Control only: ±3.0% of output spanfor each 28�C (50�F) change in temperaturebetween −40 and 71�C (−40 and 160�F) for acontroller set at 100% proportional bandReset Control only: ±2.0% of output span foreach 28�C (50�F) change in temperaturebetween −40 and 71�C (−40 and 160�F) for acontroller set at 100% proportional bandTransmitters only: ±3.0% of output span foreach 28�C (50�F) change in temperature
between −40 and 71�C (−40 and 160�F) for atransmitter set at 100% span
Housing
Designed to NEMA 3 (Weatherproof) and IEC 529IP54 Specifications
Hazardous Area Classification
Complies with the requirements of ATEX Group IICategory 2 Gas and Dust
Construction Materials
See tables 2, 3, and 6
Approximate Weight
8.2 kg (18 pounds)
Options� Stainless steel bellows
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 − Process Instrument Terminology.1. The pressure and temperature limits in this document, and any applicable standard or code limitation should not be exceeded.2. Normal m3/hr: normal cubic meters per hour (m3/hr, 0�C and 1.01325 bar, absolute). Scfh: standard cubic feet per hour (ft3/hr, 60�F and 14.7 psig).3. To convert from air flow rate to natural gas flow rate multiply by 1.29.4. An adjustable differential gap (differential gap controllers) is equivalent to an adjustable deadband.
Table 1. Available ConfigurationsAVAILABLE CONFIGURATIONS
Pressure
DESCRIPTION(1) Bourdon Tube Sensing Element (Gauge Pressure Only)
Bellows Sensing Element
Gauge Pressure Differential Pressure
Proportional controller
C1P C1B
C1DProportional−plus−resetcontroller
Without anti−reset windup
With anti−reset windup − − −
Differential−gap controller − − −
Transmitter C1D1. See figure 5 and 6 for construction details.
Features (continued)
� Easy, More Accurate Adjustments—Makepressure set point, proportional band, and resetchanges with simple dial−knob controls that help toassure positive settings.
� Sensitive Response—Area ratio of large relaydiaphragm to small relay diaphragm permits smallnozzle pressure changes to induce much greateroutput pressure changes.
Principle of OperationThe pressure connections to the controller dependupon the type of pressure sensing, gauge ordifferential. Gauge pressure controllers use either aBourdon tube or bellows as the sensing element.Differential pressure controllers use two bellows tosense differential pressure.
The key to C1 controller operation is thepressure−balanced relay with its yokeddouble−diaphragm assembly, shown in figure 2 or 3.The relay is connected so that supply pressure
C1 Controllers and TransmittersProduct Bulletin
34.3:C1May 2010
4
Table 2. Bourdon Tube Pressure Ranges and MaterialsPRESSURE RANGES(1) MAXIMUM ALLOWABLE STATIC PRESSURE LIMITS(2)
MATERIAL(4)Standard With Optional Travel Stop(3)
Bar Psig Bar Psig Bar Psig
0 to 2.00 to 4.00 to 7.0
0 to 300 to 600 to 100
2.04.07.0
3060
100
3.36.611
4896
160
316 Stainless Steel
0 to 140 to 200 to 400 to 70
0 to 2000 to 3000 to 6000 to 1000
14204070
200300600
1000
19295083
280420720
1200
0 to 1000 to 2000 to 350
0 to 15000 to 30000 to 5000
100200350
150030005000
115230380
165033005500
0 to 5500 to 700
0 to 80000 to 10,000
550700
800010,000
550700
800010,000
1. Range marked on Bourdon tube may be in kPa (1 bar = 100 kPa).2. Bourdon tube may be pressured to limit shown without permanent zero shift.3. With travel stop set at 110% of the range.4. Bourdon tubes are also available in NACE compliant material. Contact your Emerson Process Management sales office for additional information.
Table 3. Bellows Pressure Ranges and MaterialsMAXIMUM ALLOWABLE
STATIC PRESSURE LIMITS(1)
PRESSURE RANGESBrass
ConstructionStainless SteelConstruction
Bar Psig Bar Psig
Gaugepressure
Vacuum0 to 150 mbar (0 to 60 inch wc)0 to 340 mbar (0 to 10 inch Hg)0 to 1.0 bar (0 to 30 inch Hg)
1.42.82.8
204040
− − −− − −6.9
− − −− − −100
Compoundpressure
75 mbar vac. to 75 mbar (30 inch wc vac. to 30 inch wc) 1.4 20 6.9 100
500 mbar vac. to 500 mbar (15 inch Hg vac. to 7.5 psig) 2.8 40 6.9 100
1.0 bar vac. to 1.0 bar (30 inch Hg vac. to 15 psig) 2.8 40 − − − − − −
Positivepressure
0 to 150 mbar (0 to 60 inch wc)0 to 250 mbar(2) (0 to 100 inch wc)0 to 350 mbar(3) (0 to 140 inch wc)0 to 0.35 bar (0 to 5 psig)0 to 0.5 bar (0 to 7.5 psig)
1.41.42.82.82.8
2020404040
− − −− − −− − −− − −− − −
− − −− − −− − −− − −− − −
0 to 0.7 bar (0 to 10 psig)0 to 1.0 bar (0 to 15 psig)0 to 1.4 bar (0 to 20 psig)0 to 2.0 bar (0 to 30 psig)
2.82.82.82.8
40404040
− − −6.9− − −6.9
− − −100− − −100
Differential pressure(4)
0 to 200 mbar (0 to 80 inch wc)0 to 0.7 bar (0 to 10 psi)0 to 1.4 bar (0 to 20 psi)0 to 2.0 bar (0 to 30 psi)
1.42.82.8− − −
204040− − −
− − −− − −− − −6.9
− − −− − −− − −100
1. Bellows may be pressured to limit shown without permanent zero shift.2. C1B transmitter only.3. Except C1B transmitter.4. The overrange limit for these sensing elements is a differential pressure equal to the maximum allowable static pressure limit.
Table 4. Supply Pressure Data
Output Signal Normal Operating SupplyPressure(1)
Maximum Allowable Supply Pressure To PreventInternal Part Damage(2)
Bar0.2 to 1.0 or 0 and 1.4 (differential gap) 1.4 2.8
0.4 to 2.0 or 0 and 2.4 (differential gap) 2.4 2.8
Psig3 to 15 or 0 and 20 (differential gap) 20 40
6 to 30 or 0 and 35 (differential gap) 35 401. If this pressure is exceeded, control may be impaired.2. If this pressure is exceeded, damage to the controller may result.
C1 Controllers and TransmittersProduct Bulletin34.3:C1May 2010
5
Table 5. Supply and Output Pressure Gauge Ranges
Gauge Scale 0.2 to 1.0 Bar (3 to 15 Psig) or0 and 1.4 Bar (0 and 20 Psig) Output
0.4 to 2.0 Bar (6 to 30 Psig) or0 and 2.4 Bar (0 and 35 Psig) Output
Single0 to 30 psig0 to 2 kg/cm2
0 to 200 kPa
0 to 60 psig0 to 4 kg/cm2
0 to 400 kPa
Dual 0 to 30 psig/0 to 200 kPa 0 to 60 psig/0 to 400 kPa
Triple 0 to 30 psig/0 to 2 kg/cm2/0 to 2 bar 0 to 60 psig/0 to 4 kg/cm2/0 to 4 bar
Table 6. Construction MaterialsPart Material
In contact withprocess
Bourdon tube Stainless steel or NACE compliant material
Sensing bellows Brass or stainless steel
Pressure block Stainless steel
Control tubing (from pressure block to sensing elementand to optional process pressure gauge)
Stainless steel
In contact withoperatingmedium
All other interior tubing Stainless steel
Exterior tubingCopper (with or without PVC plastic lining), stainless steel, orsynthetic rubber
Exterior fittings Brass or stainless steel
Nozzle and reversing block Zinc/stainless steel
Relay springs and spring plate Steel
Relay diaphragms Nitrile/nylon (standard) or polyacrylate/nylon (high−temperature)
Other metal relay parts, proportional bellows,and exhaust/reset bellows
Aluminum/stainless steel
Reset valve assembly and differential relief valve if used Zinc/steel/ceramic
O−rings Nitrile (standard) or fluorocarbon (high−temperature)
Gaskets Chloroprene (standard) or silicone (high−temperature)
Other Case and adjustment dial Aluminum
Cover Aluminum, except glass for gauge windows
Flapper Stainless steel
Control link N04400 nickel alloy and/or stainless steel
Flexure and pressure/ setting adjustment assemblies Aluminum/steel/stainless steel/plastic
Calibration adjustor Zinc
O−rings Nitrile
bleeds through the fixed orifice before escapingthrough the nozzle. The nozzle pressure registers onthe large relay diaphragm, and loading pressure(controller output) on the small relay diaphragm.
Steady−state sensed process pressure holds theBourdon tube steady in relation to the nozzle. Thisallows pressure to escape between the nozzle andbeam−flapper assembly at the same rate it bleedsthrough the orifice.
A change in the process pressure moves the beamand flapper with respect to the nozzle by eitherexpanding or contracting the Bourdon tube arc. Anincreasing process pressure with direct action (ordecreasing pressure with reverse action) produces anozzle−flapper restriction that increases the loadingon the large relay diaphragm. This causes the relay
valve to close at the exhaust end and to open at theinlet end. Additional supply pressure flows throughthe relay chamber to increase the loading pressureon the control valve actuator. A decreasing processpressure with direct action (or increasing pressurewith reverse action) produces a nozzle−flapperopening that bleeds off pressure on the large relaydiaphragm. This causes the relay valve inlet to closeand the exhaust to open, thus exhausting loadingpressure from the actuator.
Proportional−Only ControllersThe controller output pressure change feeds back tothe proportional bellows, countering the pressurechange in the nozzle and equalizing the relaydiaphragm pressure differential. The relay valvemaintains a new loading pressure according to thechange in sensed pressure.
C1 Controllers and TransmittersProduct Bulletin
34.3:C1May 2010
6
CONSTANT SUPPLYPRESSURE
EXHAUST
EXHAUST END OF RELAY
BOURDON TUBE
FIXEDPIVOT
BEAM ANDFLAPPER
NOZZLE
VENT
INLET END OFRELAY VALVE
SMALL DIAPHRAGMLARGE DIAPHRAGM
TO FINALCONTROLELEMENT
SENSEDPRESSURE
RESTRICTION
PROPORTIONAL-PLUS-RESETCONTROLLER
PROPORTIONAL-ONLYCONTROLLER
GE23696GE34724−AE1062
PROPORTIONALBELLOWS
RESET BELLOWS
SENSED PRESSURE OUTPUT PRESSURE NOZZLE PRESSURE RESET PRESSURE
CANTILEVERSPRING
RESETVALVE
RESETBELLOWS
PRESSURE SETTING DIAL
PRESSURE−SETTING KNOB
PROPORTIONALBELLOWS
PROPORTIONALBAND ADJUSTMENTKNOB
Figure 2. Schematic of Reverse−Acting Proportional−Only and Proportional−Plus−Reset Controllers
If the proportional band adjustment is at itsmaximum setting, the cantilever spring in theproportional band assembly has a low spring rate,allowing more feedback motion to be transferredfrom the proportional bellows for a change in outputpressure. As the effective length of the cantilever isreduced, its spring rate increases, causing lessfeedback motion from proportional bellows. Settingthe proportional band knob to its maximum results ina proportional band of 100%. The lower theproportional band adjustment, the shorter theeffective length of the cantilever spring. The springrate of the cantilever spring increases as its lengthshortens, allowing less motion to be transferred fromthe bellows to the beam and flapper for a givenchange in output pressure.
Proportional−Plus−Reset ControllersAdditionally, all proportional−plus−reset C1controllers have a two−way reset restriction valvethat channels proportional pressure into a resetbellows to oppose the proportional bellows action.The action of this reset pressure occurs on adelayed basis. The reset valve can be adjusted tovary the time of delay.
Anti−Reset Windup
C1 controllers with anti−reset windup have anadjustable and reversible differential relief valve toprovide anti−reset windup. As shown in figure 3, theproportional pressure registers rapidly on the springside of the relief valve diaphragm as well as in theproportional bellows. Reset pressure registers slowlyon the opposite side of the relief valve diaphragm.As long as controller output pressure changes areslow enough for normal proportional and resetaction, the relief valve spring keeps the relief valvediaphragm from opening. However, a large or rapiddecrease in controller output pressure causes therelay to rapidly exhaust loading pressure from thecontrol element, and also from the proportionalsystem and spring side of the relief diaphragm. If thisdecrease on the spring side of the diaphragm isgreater than the relief valve spring setting, thediaphragm will move off the relief valve orifice andpermit the reset pressure on the opposite side of therelief valve diaphragm to bleed rapidly into theproportional system. The anti−reset windup actionalso can be reversed to relieve with an increasingproportional pressure.
C1 Controllers and TransmittersProduct Bulletin34.3:C1May 2010
7
CONSTANT SUPPLYPRESSURE
TO FINALCONTROLELEMENT
EXHAUST
RESET BELLOWS
RESTRICTION
RESET VALVE
GE23697−AGE34724−AE1063−1
SENSEDPRESSURE
PROPORTIONAL BELLOWS
SENSED PRESSURE OUTPUT PRESSURE NOZZLE PRESSURE RESET PRESSURE
DIFFERENTIALRELIEF VALVE
CANTILEVERSPRING
PRESSURESETTING DIAL
PROPORTIONALBAND ADJUSTMENTKNOB
PRESSURE−SETTING KNOB
Figure 3. Schematic of Reverse−Acting Proportional−Plus−Reset Controller with Anti−Reset Windup
Differential Gap Controllers
In C1 differential gap controllers, feedback pressuredoes not counteract the change in flapper position.Instead, the output pressure is piped to the bellowslocated on the side of the beam and flapper oppositethe nozzle. Feedback pressure now reinforces theflapper movement by the sensed pressure change.This construction causes the controller output toswitch from full supply pressure to zero pressure orvice versa. The difference between the processpressure when the controller output switches to zeroand the process pressure when the controllerswitches to maximum is the differential gap.Adjusting the proportional band adjustment adjuststhe width of the gap; adjusting the set point positionsthe gap within the process pressure range.
TransmittersAction of a pneumatic transmitter is similar to that ofa proportional−only controller. Since the outputpressure of the transmitter has no effect on the
process pressure, transmitter output pressure is aproportional measure of the process pressure. Theproportional band adjustment determines the span ofthe transmitter and the pressure setting mechanismdetermines the zero of the transmitter.
Construction Features
Rugged Service Capability
The case and cover are made of weather resistant,die−cast aluminum. Stainless steel tubing and fittingmaterials provide the capability for operation inammonia and similar corrosive service conditions.Optional materials for relay diaphragms and othersoft parts permit operation at ambient temperaturesup to 93�C (200�F).
C1 Controllers and TransmittersProduct Bulletin
34.3:C1May 2010
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PROPORTIONAL TUBING
DIRECT ACTINGREVERSE ACTING
REVERSING BLOCK
DIRECT ACTING POSITIONPROPORTIONALBAND ASSY
REVERSEACTING POSITION
RELAY TUBING
GE28263−AE1064−1
PROPORTIONAL TUBING
RELAY TUBING
BELLOWS
BELLOWS
PROPORTIONAL-ONLY CONTROLLER OR TRANSMITTER
FLAPPER/SCREWFLAPPER/SCREW
PROPORTIONAL BAND ASSY
REVERSE ACTINGPOSITION
REVERSING BLOCK
PROPORTIONAL BAND ASSY
DIRECT ACTINGREVERSE ACTING
GE34724−AE1066−1
RELAY TUBING
DIRECT ACTING POSITION
PROPORTIONAL TUBING
PROPORTIONAL BANDASSY
DIFFERENTIAL-GAP CONTROLLER
FLAPPER/SCREW
REVERSING BLOCK
FLAPPER/SCREW
PROPORTIONAL TUBING
RELAY TUBING
BELLOWS
BELLOWS
REVERSING BLOCK
Figure 4. Conversion from Reverse to Direct Action or Proportional to Differential Gap
Low−Pressure Precision
Bellows sensing constructions provide betteraccuracy in low−pressure, vacuum, or compoundranges. Two sensing bellows are used where animportant variable is the difference between twosensed pressures.
Conversion From Proportional To DifferentialGap Control
The C1 controller can be configured to providedifferential gap (on−off control) rather thanproportional control. The proportional bellows isconnected so that feedback pressure pushes thebeam and flapper in the same direction as caused
by the sensed pressure change. This reinforcementcompletely opens the relay valve either to full supplypressure or to full exhaust, allowing no in−betweenthrottling. To change from a proportional to adifferential gap controller, or vice versa, just reversethe tubing connection on the mounting base andinvert the proportional band assembly, as shown infigure 4.
Reverse/Direct Conversion
Switching the action from reverse to direct or viceversa is done by moving the reversing block andfeedback bellows connection and inverting theproportional band assembly as shown in figure 4.
C1 Controllers and TransmittersProduct Bulletin34.3:C1May 2010
9
PRESSUREBLOCKAND TUBING
RELAYORIFICE
SPRING−OUTCLEANINGWIRE
PRESSURE ADJUSTMENTDESIGN MINIMIZESBACKLASH FOR MOREPOSITIVE SETTINGS
REVERSINGBLOCK
VENTEDBELLOWS
PROPORTIONALBELLOWS
REVERSE-ACTING CONTROLLERPROPORTIONAL
HIGH−VISIBILITYDIAL ON RESET VALVE
PROPORTIONALBELLOWS
RESETBELLOWSREVERSE-ACTING CONTROLLER
PROPORTIONAL-PLUS-RESETANTI-RESET WINDUPASSEMBLY DETAIL
GE28280−BGE28281−BGE31718−AE1056
PROPORTIONALBAND ASSEMBLY
PROPORTIONALBAND ASSEMBLY KNOB
PROPORTIONALBAND ASSEMBLY
PROPORTIONALBAND ASSEMBLYKNOB
Figure 5. Fisher C1 Constructions
C1 Controllers and TransmittersProduct Bulletin
34.3:C1May 2010
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DIFFERENTIAL BELLOWS DETAILS
BELLOWS DETAILS
SENSING BELLOWS
BELLOWS SPRING
GE35157E1058
GE34727−BE1057
HIGH−PRESSURE SENSING BELLOWS
LOW−PRESSURESENSING BELLOWS
Figure 6. Bellows Details
Anti−Reset Windup
The anti−reset windup capability of C1 controllersprovides quick equalization of reset and proportionalpressures. This capability reduces overshoot and thetime required for a system to return to the pressuresetting after large changes in sensed pressure. Thisfeature is useful when slow reset and broadproportional band settings are used.
CONTROLLERLOADINGPRESSUREGAUGE
LOADING PRESSUREOUTPUT FROMCONTROLLER
ALTERNATE LOADINGPRESSURE GAUGE670 OR 671 MANUAL LOADERWITH THREE−WAYCHANGEOVERVALVE
ALTERNATELOADINGPRESSURESOURCE
TO ACTUATOR AND VALVEA2111−2 / IL
Figure 7. Schematic of Manual Backup Changeover Hookup
The differential relief valve has a range of 0.14 to 0.4bar (2 to 7 psig) and, unless ordered otherwise, isset by the factory to relieve at a 0.3 bar (5 psi)difference between proportional and reset pressures.
Manual Backup
As shown in figure 7, a Fisher 670 or 671panel−mounted loading regulator with changeovervalve permits switching to an alternate loadingpressure, if a C1 controller experiences supplypressure failure or other malfunction.
Continuous Indication of Process Pressure
Replacing the supply pressure gauge on a pressurecontroller or transmitter by a process pressuregauge permits indicating process pressure in one ofthe ranges shown in table 7. To obtain a supplypressure indication, install a gauge on the supplyregulator. The process pressure gauge must bespecially ordered and comes with brass trimstandard in all ranges and stainless steel trimoptional in some ranges. Adding a process pressuregauge in the field also requires a special controlpressure block. A process pressure gauge cannot beadded to controllers or transmitters that use adifferential bellows for sensing pressure.
Bourdon Tube Protection
All Bourdon tube constructions are available withone or both of the following protective devices:
� Barrier Protector for Corrosive or CloggingProcess Fluids—A sealed and fluid−filled barrier(described in Fisher product bulletin 39:025) may beinstalled between the process and the Bourdon tube.The barrier fluid transmits sensed pressure on aone−to−one basis into the Bourdon tube.
C1 Controllers and TransmittersProduct Bulletin34.3:C1May 2010
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Table 7. Optional Process Pressure GaugesSensing Element Gauge Range(1)
Bourdon tube Positive pressure
0 to 30 psig(2)
0 to 60 psig0 to 160 psig
0 to 300 psig(2)
0 to 600 psig0 to 1000 psig
Bellows Positive pressure 0 to 30 psig(2)
1. Consult your Emerson Process Management sales office for gauges in other units.2. Also available in stainless steel trim.
� Travel Stop for Bourdon Tube—The stoplimits Bourdon tube overtravel when momentarysurges in the sensed pressure exceed the Bourdontube rating. Although it does not permit accuratecontrol or transmission of a pressure higher than theupper range limit listed in table 2, this stop doespermit Bourdon tube overpressuring to the maximumstatic pressure shown in table 2 without damage.
Installation
A C1 controller or transmitter normally comesinstalled on a final control element or indicatingdevice or equipped for separate surface or pipestandmounting. Usually, a control valve with just acontroller or transmitter and one supply regulatorhas the controller/transmitter and regulatoryoke−mounted on opposite sides of the actuator asshown in figure 8. Nipple mounting of the supplyregulator (if desired) is available. Specify suchmounting if the opposite yoke boss of an actuatorwill be occupied by a positioner.
Install the controller or transmitter so that the ventpoints down. Figure 9 illustrates the vent location,the location of all case connections, dimensions, andmounting information.
Ordering Information
Application
When ordering, specify:
1. Type of service, such as pressure reduction orpressure relief, throttling or differential gap.
2. Composition, pressure, and temperature ofmeasured variable(s).
C1CONTROLLER
FISHER 657ACTUATOR
FISHER67 FILTERREGULATOR
GE33947−AE1086
Figure 8. Typical Yoke Mounting
3. Ambient temperature
4. Pressure in process vessel (if closed)
5. Type number, orientation, and other applicabledescriptions of control or indicating device(s).
ConstructionRefer to the Specifications and the ConstructionFeatures sections. Review the description for eachspecification, construction feature, and in thereferenced tables. Specify the desired selectionwhenever there is a choice.
Always specify the complete type number of the C1controller or transmitter, direct or reverse action,supply pressure regulator, and other desiredequipment. On controllers with anti−reset windup,specify whether the differential relief valve is torelieve with falling or rising output.
Note
Neither Emerson, Emerson ProcessManagement, nor any of their affiliatedentities assumes responsibility for theselection, use, or maintenance of anyproduct. Responsibility for theselection, use, and maintenance of anyproduct remains with the purchaserand end user
C1 Controllers and TransmittersProduct Bulletin
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37.6(1.48)
241.3(9.50)
23.1(0.91)
180.8(7.12)
15.9(0.62)
60.3 DIA(2.38)
1/4 NPT
1/4 NPT
1/4 NPT
CASE TAPPED1/4 NPTFOR VENT
DETAIL OF PROPORTIONAL−PLUS−RESETCONTROLLER WITH ANTI−RESET
WINDUP RELIEF VALVE
PANEL CUTOUT DIMENSIONSFOR PANEL MOUNTING
RIGHT SIDE VIEW SHOWINGPIPESTAND MOUNTING
LEFT SIDE VIEW BACK VIEW
FRONT VIEW
1/4 NPT
238.1(9.38)
63.5(2.50)
63.5(2.50)
FLUSH PANELMOUNTING
SURFACE MOUNTING
65.8(2.59)
142.7(5.62)
79.4(3.12)
6.35(0.25)DIASCREWS
29.4(1.16)
122.2(4.81)
69.1(2.72)
122.2(4.81)
14.3 R(0.56)
215.9(8.50)
218.9(8.62)50.8
(2.00)
50.8(2.00)
23.1(0.97)
23.1(0.97)
mm(INCH)
E1053
Figure 9. Dimensions
Emerson Process Management Marshalltown, Iowa 50158 USASorocaba, 18087 BrazilChatham, Kent ME4 4QZ UKDubai, United Arab EmiratesSingapore 128461 Singapore
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