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Precision Junction Boxes
The Precise Link
Precision Junction Boxes
Accuracy and Stability
All components are designed for high
accuracy and long term stability.
Precision SMT resistors and gold plated
switches guarantee trouble free operation.
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.
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.
Stainless Steel Housing
All junction boxes are made from stainless steel and provide best reliability
even in harsh industrial environments.
Version in IP65 and IP69K are available.
Precision Junction Boxes
Junction boxes are often underestimated in terms of
their accuracy impact. Precision junction boxes combine 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
• Stainless steel enclosure
• IP65 or IP69K protection class
• Easy connection to screw type terminal blocks
Precision Junction Boxes Specificatons
Parameter
Type
Model No.
size
Item No.
No. of load cells
Load cell resistance range
Method
Inital Error 1)
Range (nominal)
Number of Steps
Shift Adjustment
Smallest Adjustment Step
unit of measure
AJB540S
30206112
Ω
%
Shift Adjustment Methods Available
Pair/Section shift adjustment
Legal For Trade Sealing
Operating
Safe Storage
Recommended
Excitation Voltage
Max.
Insulation Resistance @50VDC
Breakdown Voltage
Earthing/Grounding
Enclosure
Material
Cable entry fitting
Temperature Range
Weight, nominal
Load Cell Cable
Home-Run and
AUX Cable
Extension via AUX port
CalFree™ calibration
without test weights
kg (lb)
No. Conductors
Conductor Size
Diameter
No. Conductors
Conductor Size
Diameter
Possible
Max. no. of load cells for 1st box
AUX cable max. recommended wire
resistance 2)
AUX cable max. recommended
length of 0.14mm2 (AWG24)
AUX cable max. recommended
length of 0.5mm2 (AWG20)
Suitable 3)
Impact of J box on Signal
AUX cable max. recommended wire
resistance for CalFree™
AUX cable max. recommended
length of 0.5mm2 (AWG20)
Impact of junction box due to resistor tolerances
Assuming 50 % shift adjustment range left
3)
In conjunction with MT CalFree™ terminals
1)
2)
METTLER TOLEDO
©01/2013
MΩ
V AC
Type
IP Rating
NEMA Rating
Protection
2
V AC/DC
Data Sheet Precision Junction Boxes
mm2 (AWG)
mm (in)
mm2 (AWG)
mm (in)
30070226
2,3,4
–
m (ft)
AJB540L
large
30206113
0.5
1.5
2.5 (8.3)
8 (26)
10 (33)
30 (100)
–
yes
< 0.1%
%
Ω
0.05
–
m (ft)
AJB541M
medium
30206111
120 - 1000
120 - 4000
Encoding rotary switches with precision discrete resistors
< 1/6000
1.3
1.3 (3.5 extended @ 1000Ω)
256
1/19000
On-load - Adjustment without calculation similar to trim pot adjustment
Inital – Compensation of multiple junction box connection
yes
sealing wire or sticker
-20 ~ +65 (-4 ~ +150)
-40 ~ +80 (-40 ~ +176)
10
20
> 5000
> 500
via mounting screws
dedicated stud
via mounting screws
dedicated stud
stainless steel
stainless steel 316
stainless steel
carbon steel, zinc
Polyamide (Nylon)
plated
rubber gasket
IP65
IP69K
IP65
NEMA 4
1.1
1.2
1.7
3.8
4 and 6 + Shield
≤ 3 (12)
4-8 (0.16-0.32)
3-6.5 (0.12-0.25)
4.8-6.4 (0.19-0.25)
6 + Shield
≤ 3 (12)
6-12 (0.24-0.48)
4-8 (0.16-0.32)
6.4-9.5 (0.24-0.48)
no
yes
no
4
Ω
m (ft)
AJB641S
small
30206108
Specification
Precision Junction Box
AJB841S
–
1.5 (5)
Dimensional Drawings mm [inch]
AJB540S
6.4
[0.25]
AJB641S /AJB841S
6.4
[0.25]
134 [5.28]
43.5
[1.71]
40.4
[1.59]
6.4
[0.25]
209.3
[8.24]
228.6
[9.00]
241.3
[9.50]
70 [2.76]
7
36
[1.42]
130 [5.12]
194 [7.64]
14.2
[0.56]
6.4
[0.25]
11.4
[0.45]
15.0
[0.59]
40.4
[1.59]
65.8
[2.59]
174 [6.85]
209.3
[8.24]
228.6
[9.00]
241.3
[9.50]
44.0
[1.73]
80.8
[3.18]
AJB541M
305 [12.0]
127 [5.0] TYP
104 [4.1] TYP
47 [1.9]
279.4 [11.00]
15.9 [0.63]
41.3 [1.63]
53.2 [2.10]
D
LC2
47.6 [1.88]
47.6 [1.88]
12.7 [0.50]
E
AUX
11.2 [0.44] TYP
LC1
76.2 [3.00]
INPUT
41.1 [1.62]
130.9 [5.15]
A
LC4
159 [6.3]
B
LC3
C
F
7.9 [0.31] TYP
15.2 [0.60]
15.2 [.060]
FOR ATEX VERSION ONLY
55.2 [2.17]
194.4 [7.65]
METTLER TOLEDO
Data Sheet Precision Junction Boxes
©01/2013
3
AJB540L
255 [10.0]
ON ONLY
125 [4.9]
235.0 [9.25]
10.0 [0.39]
15.9 [0.63]
ATEX Version only
See Note
40.1
[1.58]
5932 [2.33]
50.8 [2.00]
9.5 [0.38]
143.7 [5.66]
34.9 [1.38]
Ø 12.7 [Ø 0.50]
12.7 [ 0.50]
2 Places
2 Places
Ø 6.4 [Ø 0.25]
6.4
4 Places
A
B
82.6 [3.25]
C
28.6 [1.12]
D
2 Hole plugs supplied to close any unused cable entry fittings.
219.9 [8.66]
[1.75]with 1/2“-14 NPT thread
For threaded44.5
conduit
34.9 [1.38]
17.5 [0.69]
28.6 [1.12]
(255 [10.0])
102 [4.0] TYP
79 [3.1] TYP
Precision Junction Boxes
Order Information
Item No.
30206112
30206108
30070226
30206111
30206113
LC2
LC4
INPUT
Model
Description
AJB540S
Precision Junction Box, small, IP65
AJB641S
Precision Junction Box, small, IP69K
AJB841S
Precision Junction Box, small, IP69K, 316SS
AJB541M
Precision Junction Box, medium, IP65
AJB540L
Precision Junction Box, large, IP65, Conduit
Bolded entries are stocked
AUX
F
63.5
[2.50]
LC1
LC3
Weighing Electronics
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Environment certificate ISO 14001
Subject to technical changes.
© 01/2013 Mettler-Toledo AG
Printed in Switzerland MTSI 44098448
MarCom Industrial
www.mt.com
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