Cooling dry block heater ADT875-155

digitalexternally-controlledwith touchscreen

Overview
The ADT875 dry-well calibrator is a portable dry-well furnace designed to provide speed, stability and accuracy across a wide temperature range. It features multiple communication interfaces (USB A, USB B, RJ45, Wi‑Fi and Bluetooth). A CYOR option is available to select a custom temperature range and optimize calibration within that span. Internal control sensor auto-calibration allows automatic adjustment from an external reference.

Key functional features

• Standard range: -40 °C to 155 °C (model 875-155).
• Portable and fast to reach setpoints.
• Metrological performance: stability, uniformity, accuracy and load-effect compensation.
• Colour touchscreen display.
• Optional Process Calibrator (PC): combines process calibration functions (HART documentation, current/voltage/switch/RTD/thermocouple measurements) with the dry-well temperature block; records "as found" and "as left" tasks, screenshot, multi-channel logging, auto-step and ramp functions.

Detailed functionalities

• Auto-calibration of the internal control sensor from an external reference (automatic and traceable procedure).
• Setpoint control of the dry well via internal sensor or external PRT reference.
• Documentation: large storage capacity (e.g. up to 1000 tasks depending on option), result logging and record-keeping functions.

Applications & uses
Testing and calibration of probes (PRT, RTD), thermocouples, temperature transmitters and switches. Suitable for probe comparison with external reference, resistance probe measurement and transmitter/switch testing.

Technical characteristics / specifications

• Temperature range (at 23 °C): -40 °C to 155 °C.
• Display accuracy: ±0.18 °C across the range.
• 30-minute stability: ±0.01 °C.
• Axial uniformity (60 mm): ±0.07 °C.
• Radial uniformity: ±0.01 °C.
• Load effect: ±0.1 °C (display sensor); ±0.02% (external sensor).
• Environmental conditions: guaranteed accuracy between 8 °C and 38 °C; normal operation 0 °C to 50 °C, 0% to 90% RH non-condensing, up to 3000 m altitude.
• Storage conditions: -20 °C to 60 °C.
• Protection rating: IP20.
• Immersion depth: 150 mm.
• Insert OD: 25.8 mm.
• Heating time: 13 min (-40 °C → 155 °C); 5 min (-40 °C → 23 °C); 8 min (23 °C → 155 °C).
• Cooling time: 28 min (155 °C → -40 °C); 8 min (155 °C → 23 °C); 20 min (23 °C → -40 °C).
• Normal stabilization time: 10 min.
• Display resolution: 0.01 °C.
• Available units: °C, °F and K.
• Display: 165 mm colour touchscreen.
• Size (H x W x D): 320 x 170 x 330 mm.
• Weight: 9.9 kg.
• Power supply: 90-254 VAC, 45-65 Hz, 580 W.
• Mechanical tests: vibration 2 g (10-500 Hz) 30 min on two sides; shock 3 × 4 g; drop test 500 mm.
• Communication: USB A, USB B, RJ45, Wi‑Fi, Bluetooth.
• Interface languages: English, Chinese, Japanese, Russian, German, French, Italian and Spanish.
• Process Calibrator option (input specifications): Pt100 display example accuracies: ±0.009 °C at -40 °C, ±0.010 °C at 0 °C, ±0.012 °C at 50 °C, etc.; Pt100 measurement resolution: 1 mΩ; reference resistance range: 0 Ω to 400 Ω; reference resistance accuracy: 0 Ω–50 Ω: 0.002 Ω; 50 Ω–400 Ω: 0.004% of reading.
• Reference measurement capability: 4-wire PRT; reference probe connection: LEMO 6-pin smart connector; number of resistance/RTD channels: 2 (2-, 3- and 4-wire measurement); number of TC channels: 2; miniature TC connections for types S, R, K, B, N, E, J, T, C, D, G, L and U.
• TC measurement accuracy (sensor excluded, example type K): ±0.13 °C at 0 °C; ±0.15 °C at 155 °C; ±0.18 °C at 350 °C; ±0.24 °C at 660 °C.
• TC range: -100 mV to 100 mV; TC resolution: 0.01 V, input impedance < 1 MΩ.
• Current range: -30 mA to 30 mA; current accuracy: 0.02% RD + 2 µA; current resolution: 0.001 mA, input impedance < 100 Ω.
• Voltage range: -30 V to 30 V; voltage accuracy: ±0.02% of reading + 2 mV; voltage resolution: 0.01 V, input impedance < 1 MΩ.
• DC 24 V output: 24 V ±1 V, MAX 60 mA.
• HART communication: available as option (ADT875 model).
• Documentation (option): storage up to 1000 tasks, each storing 10 results including "as found" and "as left" data, screenshot function and auto-step and ramp recording.