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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 Our extensive service network is among the best in the world and ensures maximum availability and service life of your product. METTLER TOLEDO offers a complete family of electronics from simple weighing to application solutions for filling, stock control, batching, formulation, counting, and checkweighing. Quality certificate ISO 9001 Environment certificate ISO 14001 Subject to technical changes. © 01/2013 Mettler-Toledo AG Printed in Switzerland MTSI 44098448 MarCom Industrial www.mt.com Visit for more information