the precise link precision junction boxes
TRANSCRIPT
Prec
isio
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.
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)
5.8-10.4 (0.23-0.41)
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 © 09/2019 - Precision Junction Boxes
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 © 09/2019 - Precision Junction Boxes
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
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© 09/2019 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