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Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often underestimated in terms of their accuracy impact. Precision junction boxes com- bine the best of two worlds. Discrete resistors provide high accuracy and long term stability while rotary switches combine them to a simple user interface similar to trim pots. • Accurate and stable discrete resistors • Rotary switches for easy user interface • No soldering, no loose resistors • Neutral initial setup for CalFree™ calibration • 304 or 316 stainless steel enclosure • IP65 or IP69K protection class • Hygenic Version - NSF and GMP approved • Easy connection to screw type terminal blocks • ATEX/IECEx Version Zone 1/21 & 2/22 CalFree™ Precision Junction boxes can be set to be absolutely neutral. Thus initial shift error is low and all boxes are capable for CalFree™ test weight free calibration. Stainless Steel Housing All junction boxes are made from stain- less steel and provide best reliability even in harsh industrial environments. Version in IP65 and IP69K are available. Accuracy and Stability All components are designed for high accuracy and long term stability. Precision SMT resistors and gold plated switches guarantee trouble free opera- tion. Easy Shift Adjustment All components for shift adjustment are on board, no soldering or additional resistors are needed. Rotary switches can be operated like trim pots without their trade-offs in terms of stability and temperature impact.

The Precise Link Precision Junction Boxes · Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often

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Page 1: The Precise Link Precision Junction Boxes · Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often

Prec

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n Ju

nctio

n Bo

xes The Precise Link

Precision Junction Boxes

Precision Junction BoxesWhen Accuracy Matters

Junction boxes are often underestimated in terms of their accuracy impact. Precision junction boxes com-bine the best of two worlds. Discrete resistors provide high accuracy and long term stability while rotary switches combine them to a simple user interface similar to trim pots.

• Accurate and stable discrete resistors• Rotary switches for easy user interface• No soldering, no loose resistors • Neutral initial setup for CalFree™ calibration• 304 or 316 stainless steel enclosure• IP65 or IP69K protection class• Hygenic Version - NSF and GMP approved• Easy connection to screw type terminal blocks• ATEX/IECEx Version Zone 1/21 & 2/22

CalFree™Precision Junction boxes can be set to be absolutely neutral. Thus initial shift error is low and all boxes are capable for CalFree™ test weight free calibration.

Stainless Steel HousingAll junction boxes are made from stain-less steel and provide best reliability even in harsh industrial environments.Version in IP65 and IP69K are available.

Accuracy and StabilityAll components are designed for high accuracy and long term stability. Precision SMT resistors and gold plated switches guarantee trouble free opera-tion.

Easy Shift AdjustmentAll components for shift adjustment are on board, no soldering or additional resistors are needed. Rotary switches can be operated like trim pots without their trade-offs in terms of stability and temperature impact.

Page 2: The Precise Link Precision Junction Boxes · Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often

Precision Junction Boxes SpecificatonsParameter unit of measure Specification

Type Precision Junction Box Precision Junction Boxes ATEX

Model No. AJB540S AJB641S AJB841S AJB541M AJB540L AJB941M AJB641SX AJB841SX

Size small medium large medium small

Application standardhigh

corrosionlarge size Conduit hygienic hazardous

hazardous,high corrosion

Hygienic approvals NSF and GMP certified

Item No. 30206112 30206108 30070226 30206111 30206113 30219978 30070224 30070225No. of load cells 2, 3, 4Load cell resistance range Ω 120 - 1200 120 - 4000 120 - 1200 120 - 1200

Shift Adjustment

Method Encoding rotary switches with precision discrete resistors

Inital Error 1) < 1/6000

Range (nominal) % 1.31.3 (3.5 extended @

1000Ω)1.3

Number of Steps 256Smallest Adjustment Step 1/19000

Shift Adjustment MethodsAvailable

On-load – Adjustment without calculation similar to trim pot adjustment

Inital – Compensation of multiple junction box connection

Pair/Section shift adjustment yesLegal For Trade Sealing sealing wire or sticker

Temperature RangeOperating -30 ~ +65 (-4 ~ +150) -30 ~ +60 (-4 ~ +140)

Safe Storage -40 ~ +80 (-40 ~ +176)

Excitation VoltageRecommended

V AC/DC10

Max. 20 17.4

Insulation Resistance @50VDC MΩ > 5000

Breakdown Voltage V AC > 500

Earthing/Grounding

via mounting screws dedicated stud

via mounting screws

dedicated stud via mounting screws optional - not required

ATEX Approval 4)

Number, Cat. 2 DEKRA 03ATEX1396X

Ratings, Cat. 2II 2 G Ex ia IIC T4 Gb

II 2D Ex ib IIIC T70°C … T90°C Db

Entity Parameters, Cat. 2

Ui = 17.3V, Ii = 300mA, Pi = 1.2W, Ci=Li= 0

Ui = 6.0V, Ii = 200mA, Pi = 1.2W, Ci=Li=0"

Number, Cat. 3 DEKRA 03ATEX1397X

Ratings, Cat. 3II 3 G Ex ic IIC T4 Gc II 3 G Ex nA IIC T4 Gc

II 3 D Ex tc IIIC T70°C … T90°C Dc

Entity Parameters, Cat. 3Ui = 30V, Ii = 1A

Ui = 10.5V, Ii = 500mA, Ci=0, Li=0

IECEx Approval 4)

Number IECEx DEK 17.0047X

Ratings

Ex ia IIC T4 Gb, Ex ic IIC T4 Gc, Ex nA IIC T4 Gc

Ex ib IIIC T70°C … T90°C Db, Ex tc IIIC T70°C … T90°C Dc

Material

Enclosure stainless steelstainless steel 316

stainless steelstainless steel, FDA certified

stainless steel stainless steel 316

Cable entry fitting Polyamide (Nylon)carbon steel, zinc plated

stainless steel Polyamide (Nylon)

ProtectionType rubber gasket silicon rubber gasketIP Rating IP65 IP69K IP65 IP69K IP69KNEMA Rating NEMA 4/4X

Weight, nominal kg (lb) 1.1 1.2 1.7 3.8 3.0 1.2

Load Cell Cable

No. Conductors 4 and 6 + Shield

Conductor Size mm2 (AWG) ≤ 3 (12)

Diameter mm (in) 4-8 (0.16-0.32) 3-6.5 (0.12-0.26) 4.8-6.5 (0.19-0.26)"5.0-5.4

(0.197-0.21)"3-6.5 (0.12-0.26)

Home-Run andAUX Cable

No. Conductors 6 + Shield

Conductor Size mm2 (AWG) ≤ 3 (12)

Diameter mm (in)6-12

(0.24-0.48)4-8 (0.16-0.32) 6.4-9.5 (0.25-0.48)

"5.8-6.3; 6.8-7.1; 9.4-10.4

(0.23-0.25; 0.265-0.28; 0.37-0.41)"

4-10 (0.16-0.4)

Extensionvia AUX port

Possible no yes no yes yes

Max. no. of load cells for 1st box

-

4

-

4 4

AUX cable max. recommendedwire resistance 2) Ω 0.5 1.5 0.5 0.5

AUX cable max. recommendedlength of 0.14mm2 (AWG24) 2) m (ft) 2.5 (8.3) 8 (26) 2.5 (8.3) 2.5 (8.3)

AUX cable max. recommendedlength of 0.5mm2 (AWG20)

m (ft) 10 (33) 30 (100) 10 (33) 10 (33)

CalFree™calibration withouttest weights

Suitable 3) yesImpact of J box on Signal % < 0.1%

AUX cable max. recommendedwire resistance for CalFree™

Ω-

0.05-

0.05 0.05

AUX cable max. recommendedlength of 0.5mm2 (AWG20)

m (ft) 1.5 (5) 1.5 (5) 1.5(5)

1) Impact of junction box due to resistor tolerances2) Assuming 50 % shift adjustment range left3) In conjunction with MT CalFree™ terminals4) See certificate for complete information

METTLER TOLEDO © 12/2018 - Precision Junction Boxes

Page 3: The Precise Link Precision Junction Boxes · Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often

305 [12.0]

127 [5.0] TYP

104 [4.1] TYP

12.7 [0.50]279.4 [11.00]

41.3 [1.63]

76.2 [3.00]

159 [6.3]

194.4 [7.65] 55.2 [2.17]

15.2 [.060]

15.9 [0.63]

47.6 [1.88]

47.6 [1.88]

(4X) 10-32 X 12.7 [0.50] LG

A

B

C

LC1

LC2 LC4

LC3

AUX

INPU

T

53.2 [2.10]

41.1 [1.62]

11.2 [0.44] TYP

130.9 [5.15]

47 [1.9]

47.6 [1.88]

47.6 [1.88]E

15.9 [0.63]

15.2 [0.60]

D

F

7.9 [0.31] TYP

Dimensional Drawings mm [in]

134 [5.28]

43.

5 [1

.71]

130

[5.1

2]

174 [6.85]

7

36

[1

.42]

70 [

2.76

]

194 [7.64]

AJB540S

AJB541M

6.4[0.25]

6.4[0.25]

209.3[8.24]

228.6[9.00]

241.3[9.50]

40.4[1.59]

14.2[0.56] 11.4

[0.45]

15.0[0.59]

65.8[2.59]

44.0[1.73]

80.8[3.18]

40.4[1.59]

6.4[0.25]

6.4[0.25]

209.3[8.24]

228.6[9.00]

241.3[9.50]

40.4[1.59]

14.2[0.56] 11.4

[0.45]

15.0[0.59]

65.8[2.59]

44.0[1.73]

80.8[3.18]

40.4[1.59]

AJB641S, AJB641SX, AJB841SX

METTLER TOLEDO © 12/2018 - Precision Junction Boxes

Page 4: The Precise Link Precision Junction Boxes · Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often

FOR ATEX VERSION ONLYTWO PLACES

95.3 [3.75]

28.6 [1.12]

28.6 [1.12]

E

F

(255 [10.0])

102 [4.0] TYP

79 [3.1] TYP

INPU

T

AUX

LC2 LC4

LC1 LC3

5932 [2.33]

34.9 [1.38]

219.9 [8.66] 17.5 [0.69]

63.5 [2.50]

40.1[1.58]

10.0 [0.39]

255 [10.0]

235.0 [9.25]

9.5 [0.38]

143.7 [5.66]

34.9 [1.38]

28.6 [1.12]

44.5 [1.75]

28.6 [1.12]

82.6 [3.25]

50.8 [2.00]

See Note

15.9 [0.63]

125 [4.9]

A

B

C

D

12.7 [ 0.50]2 Places

6.4Ø 6.4 [Ø 0.25] 4 Places

Ø 12.7 [Ø 0.50] 2 Places

C

D

ATEX Version only

For threaded conduit with 1/2“-14 NPT thread2 Hole plugs supplied to close any unused cable entry fittings.

AJB540L

METTLER TOLEDO © 12/2018 - Precision Junction Boxes

Page 5: The Precise Link Precision Junction Boxes · Precision Junction Boxes The Precise Link Precision Junction Boxes Precision Junction Boxes When Accuracy Matters Junction boxes are often

Precision Junction Boxes Order Information

Weighing ElectronicsMETTLER TOLEDO offers a complete family of electronics from simple weighing to application solutions for filling, stock control, batching, formulation, counting, checkweighing.

Our extensive service network is among the best in the world and ensures maximum availability and service life of your product.

Global ApprovalsThe Precision Junction Box is provided with all listed approvals. No need to think about options and additional charges. Simplifies the conduct of global business, order processing and service-part stocking.

Mettler-Toledo GmbHIndustrial DivisionCH-8606 Nänikon, SwitzerlandTel. + 41 44 944 22 11

Subject to technical changes© 12/2018 Mettler-Toledo GmbHMTSI 44098448 A

www.mt.comFor more information

Model Description Item No.

AJB540S Precision Junction Box, small, IP65 30206112

AJB641S Precision Junction Box, small, IP69K 30206108

AJB841S Precision Junction Box, small, IP69K, 316SS 30070226

AJB541M Precision Junction Box, medium, IP65 30206111

AJB540L Precision Junction Box, large, IP65 30206113

AJB941M Precision Junction Box, medium, hygienic, IP69K 30219978

AJB641SX Precision Junction Box, small, ATEX/IECEx, IP69K 30070224

AJB841SX Precision Junction Box, small, ATEX/IECEx, IP69K , 316SS 30070225

Bolded entries are stocked