Desktop junction system TRU 938

for test benches

Description
The TRU 938, a thermocouple reference junction unit, provides a stable and accurate temperature at 0°C or a maintained elevated temperature between 45 and 70°C. It uses Peltier elements and is designed in a compact enclosure for laboratory and calibration environments.

Applications and conditions

• Suitable for laboratory applications or installations requiring a large number of thermocouples
• Operating ambient temperature: 2 to 65°C

Alarm
An alarm activates if temperature deviates by more than ±0.2°C.

Available blocks
B1 (recommended for laboratories): 6 wells Ø6.2 mm, depth 130 mm, plus 1 well Ø4.2 mm; total capacity: 36 double junctions.
B2: 8 wells Ø8.2 mm, depth 76 mm, plus 1 well Ø4.2 mm to accept an RTD control probe (probe sold separately); total capacity: 100 junctions.

Temperature performance and specifications
Temperature range: 0°C (or 45°C to 70°C)
Stability: ±0.03°C (thermocouple loading error can be compensated by controller adjustment)
Stabilization time: 10 minutes from 44°C
Capacity: B1 = 6 wells Ø6.2 mm + 1 well Ø4.2 mm, depth 130 mm (36 junctions); B2 = 8 wells Ø8.2 mm + 1 well Ø4.2 mm, depth 76 mm (100 junctions)
Alarm: relay 5 A, 240 V (trigger at ±0.2°C)

General specifications
Dimensions H x W x D: 228 x 253 x 148 mm
Mass: 5.5 kg
Power supply: 100 / 130 V (50/60 Hz) or 208 / 240 V (50/60 Hz)
Power consumption: 100 W

Environmental specifications
Operating range: 2°C to 65°C

Models and accessories
TRU 938/36: unit fitted with block B1, accepts up to 36 thermocouples.
TRU 938/100: unit fitted with block B2, accepts up to 100 thermocouples.
Accessories: 935-14-54 (platinum probe for block B1, supplied with UKAS certificate), 935-14-55 (platinum probe for block B2, supplied with UKAS certificate), 935-17-32 (fan filter for dusty environments), 880D/x (double junctions for thermocouples K, E, N, UT, J, R or S; specify quantity and connector type required).

Features / technical specifications

• Model: TRU 938
• Function: Thermocouple reference junction unit (fixed point at 0°C or maintained at 45–70°C)
• Technology: Peltier elements
• Temperature range: 0°C or 45–70°C
• Stability: ±0.03°C
• Stabilization time: 10 minutes from 44°C
• Capacities: B1 = 36 double junctions (6 wells Ø6.2 mm + 1 well Ø4.2 mm, depth 130 mm); B2 = 100 junctions (8 wells Ø8.2 mm + 1 well Ø4.2 mm, depth 76 mm)
• Alarm: relay 5 A, 240 V (trigger at ±0.2°C)
• Dimensions: 228 x 253 x 148 mm
• Mass: 5.5 kg
• Power supply: 100 / 130 V (50/60 Hz) or 208 / 240 V (50/60 Hz), 100 W
• Operating range: 2°C to 65°C