• Temperature control from 300 °C to 1200 °C
• 3-in-1 furnace with 9 unique modes, for immersion depths from 200 mm to 370 mm
• Stability of ±0.1 °C
• Radial uniformity of ±0.2 °C @ 1200 °C and axial uniformity of ±0.2 °C @ 1200 °C
• Multi-zone temperature control and quick cool technology
• Sliding probe holder with measurement gradients and clamp, for mechanical stability and precise probe depth control
• Pivoting color touchscreen display, 7 in (178 mm)
• Alumina and metal inserts available
• Patent pending EMF shielding technology and advanced safety control
• Wi-Fi, Bluetooth, USB, and LAN communication

• Calibration of noble metal thermocouples in alumina tube mode
• Calibration of base metal thermocouples with cup or multi-hole inserts
• Annealing of noble metal thermocouples
• Calibration of short and long thermocouple probes in the same laboratory
• Primary and secondary calibration laboratories serving energy, aerospace, and metallurgy

• Temperature range: 300°C to 1200°C
• Heating time (23°C~1200°C): 40 mins, empty well
• Cooling time (1200°C~300°C): 90 mins, empty well
• Stability: ±0.1°C full range (300°C~1200°C)
• Display: 7 in (178 mm) color touch screen
• Display resolution: 0.01°C
• Display accuracy: ±5°C (long empty chamber mode)
• Heater power: 4000 W (220 V AC)
• System power: 20 A, 220 V ±10 %, 50/60Hz
• Power protection: 30 A, 250 V resettable circuit breaker
• Operating conditions: 0°C to 50°C, 0-90%RH (0°C~50°C), non-condensing, <2000 m altitude
• Storage temperature: -20°C to 70°C
• Size (W x H x L): 342 x 424 x 680 mm (13.5 x 16.7 x 26.8 in)
• Weight: 45 kg (99.2 lbs) without insert
• Communication: Wi-Fi, Bluetooth, USB, LAN
• Insert style (ordering): ALUM = Alumina tube (noble metal); CUPL = Long cup style (base metal); NO = No insert
• Optional accessories: AM1210-20 and AM1210-20-CJ Type S reference thermocouple; 9080 cable kit; ADT110-850-CUP-LONG, ADT110-850-CUP-SHORT, ADT110-850-INS-LONG, ADT110-850-INS-SHORT, ADT110-850-ALUM calibration inserts and kits
• Warranty: 1 year

• Long empty chamber mode: noble and base metal TC calibration, empty chamber; immersion depth 310 to 370 mm (geometrical center: 340 mm); axial uniformity ±0.2°C full range (within ±30 mm axial length from geometrical center); radial uniformity ±0.2°C @ 300°C, ±0.2°C @ 700°C, ±0.2°C @ 1200°C (within 14 mm from geometrical center)
• Long cup mode / long insert mode: base metal TC calibration; cup insert 36.5 X 28.5 X 80 mm, block insert 36.5 X 80 mm; immersion depth 370 mm to the bottom of insert; axial uniformity ±0.2°C full range (within 60 mm from bottom of the insert)
• Long alumina tube mode: noble metal TC calibration; 20 mm (ID) alumina tube, 26 mm (OD) X 20 mm (ID) X 630 mm (L); immersion depth 310 to 370 mm (geometrical center: 340 mm); axial uniformity ±0.2°C full range (within ±30 mm axial length from geometrical center); radial uniformity ±0.1°C @ 300°C, ±0.15°C @ 700°C, ±0.2°C @ 1200°C (within 14 mm from geometrical center)
• Short empty chamber mode: short noble and base metal TC calibration, empty chamber; immersion depth 200 to 240 mm (geometrical center: 220 mm); axial uniformity ±0.5°C in full range (within ±20 mm axial length from geometrical center); radial uniformity ±0.3°C @ 300°C, ±0.3°C @ 700°C, ±0.3°C @ 1200°C (within 14 mm from geometrical center)
• Short cup mode / short insert mode: short base metal TC calibration; cup insert 36.5 X 28.5 X 80 mm, block insert 36.5 X 80 mm; immersion depth 240 mm to the bottom of insert; axial uniformity ±0.5°C in full range (within 40 mm from bottom of the insert)
• Short alumina tube mode: short noble metal TC calibration; 16 mm (ID) alumina tube, 22 mm (OD) X 16 mm (ID) X 630 mm (L); immersion depth 200 to 240 mm (geometrical center: 220 mm); axial uniformity ±0.4°C full range (within ±20 mm axial length from geometrical center); radial uniformity ±0.25°C @ 300°C, ±0.25°C @ 700°C, ±0.25°C @ 1200°C (within 14 mm from geometrical center)
• TC annealing mode: noble metal TC annealing, without insert; immersion depth 100 mm to 500 mm; axial uniformity ±20°C @1100°C within 400 mm range (from 100 to 500 mm)
• Stability in all modes: ±0.1°C full range (300°C~1200°C)

Thermocouple calibration labs often run several furnaces side by side: one for long noble metal probes, one for short base metal probes, one for annealing. Each takes floor space, power, and its own validation. The Additel 850 is designed to cover those jobs in a single horizontal furnace, with nine operating modes selected from the touchscreen.

The modes span long immersion (310 to 370 mm) and short immersion (200 to 240 mm) work, with the chamber used empty, with a metal cup or multi-hole insert for base metal thermocouples, or with an alumina tube for noble metal thermocouples. A dedicated annealing mode handles noble metal thermocouples over 100 mm to 500 mm. Multi-zone control holds stability at ±0.1 °C from 300 °C to 1200 °C, and the sliding probe holder with depth gradients keeps reference and test probes at the right immersion.

The ADT850 runs on 220 V with a 20 A system supply, so the installation should be planned with the lab electrical layout. A Type S reference such as the AccuMac AM1210 is listed among its optional accessories. For portable dry well and field furnace work, see the Additel 875 and Additel 878.

AV-TEK Consulting supplies Additel temperature calibration equipment across North America and helps you choose the insert style and accessories for your thermocouple workload. Browse all temperature calibrators and furnaces or the full Additel range.