Video Demo


Video Demo


Temperature range from 33°C to 350°C

Portable,rugged, and quick to temperature

• Metrology-level performance in stability, uniformity,accuracy and loading effect

• Dual-zone control

• Full HART field communicator

• Process calibrator option provides a multi-channel readout for a reference thermometer,RTDs and TCs,task documentation, and HART Communication

• Color touch screen display

• Choose your own range option

• Set point control by reference

• Self-calibration feature

• ISO 17025-accredited calibration w/data included

If you are serious about portable temperature calibration tools, then you know a good dry well calibrator is more than just a stable heat source. The Additel 875 Series Dry Well Calibrators combine excellent performance in stability, radial and axial uniformity. And loading with speed, ruggedness and portability. But we don’t stop there! The Process Calibrator option adds the capabilities of a three-channel thermometer readout and a documenting process calibrator. We’ve also incorporated a unique option to select your own temperature range within the range of the model selected. We’re calling this the CYOR option or Choose Your Own Range option. When you purchase the CYOR option, you pick the upper and lower temperature range needed and we calibrate and optimize the dry well’s performance over your selected range. Each unit has a color touch screen display, dual-zone control, and much more. You are just going to love these new dry wells!


Process Calibrator Option

Each model offer has a Process Calibrator (PC) option. This process calibrator option combines the many features found in a fully functional HART documenting process calibrator with the temperature dry well. This option includes the ability to measure a reference PRT and two devices under test channels which can measure, mA, voltage, switch, RTD or thermocouple. In addition to these measurement functions, this calibrator has full documenting capability of creating tasks, saving as found and as left results, as well as reading, configuring and calibrating HART capable transmitters. The snap shot feature allows you to capture all information displayed on the screen with the push of a button. This optional add-on allows for data logging of all channels on an auto step function and a ramp function. By utilizing the reference PRT, you can select to control to the dry well set point using the internal sensor or the external reference PRT.


Self Calibration

We believe using an external reference probe as your standard is the best way to perform your temperature calibration. But we also recognize this method is not always necessary or convenient and depending on the application, using the internal control sensor would be preferred. Traditionally, the internal control sensor has a wide accuracy which can largely be contributed to its long-term drift. We’ve built-in a self calibration feature allowing you to run an automated calibration of the internal control sensor using your external reference. With literally a few selections the calibration will run automatically giving you a fresh, traceable calibration of the control sensor which will improve its accuracy as you will not have to account for its long term drift when used as the reference.





Base Unit Dry Well Specifications
Temperature Range at 23°C-40°C to 155°C33°C to 350°C33°C to 660°C
Display Accuracy±0.18°C at Full Range±0.2°C at Full Range±0.3°C at 33°C
±0.3°C at 420°C
±0.5°C at 660°C
Stability (30 min)±0.01°C at Full Range±0.02°C at Full Range±0.02°C at 33°C
±0.03°C at 50°C
±0.04°C at 420°C
±0.04°C at 660°C
Axial Uniformity at 60 mm (2.4 in)±0.07°C at Full Range±0.04°C at 33°C±0.05°C at 33°C
±0.1°C at 200°C±0.3°C at 420°C
±0.2°C at 350°C±0.5°C at 660°C
Radial Uniformity±0.01°C at Full Range±0.01°C at 33°C±0.02°C at 33°C
±0.015°C at 200°C±0.05°C at 420°C
±0.02°C at 350°C±0.1°C at 660°C
Loading Effect±0.1°C (Display Sensor)±0.15°C (Display Sensor)±0.15°C (Display Sensor)
±0.02°C (External Sensor)±0.015°C (External Sensor)±0.035°C (External Sensor)
Hysteresis (Display Sensor)0.025°C0.03°C0.1°C
Environmental Conditions8°C to 38°C guaranteed accuracy
0°C to 50°C, 0% to 90% RH non-condensing, 3000 M altitude for normal operation
Storage Conditions-20°C to 60°C
IP RatingIP20
Immersion Depth145 mm (5.70 in)150 mm(5.90 in)
Insert OD25.8 mm (1.02 in)24.8 mm (0.98 in)
Heating Time13 min: -40°C to 155°C10 min: 33°C to 350°C15 min: 33°C to 660°C
5 min: -40°C to 23°C
8 min: 23°C to 155°C
Cooling Time28 min: 155°C to -40°C15 min: 350°C to 100°C23 min: 660°C to 100°C
8 min: 155°C to 23°C10 min: 100°C to 50°C12 min: 100°C to 50°C
20 min: 23°C to -40°C10 min: 50°C to 33°C12 min: 50°C to 33°C
Typical Time to Stability10 min
Units°C, °F, and K
Display6.5 in (165 mm) color touch screen
Size (H x W x D)320 x 170 x 330 mm (12.6 x 6.7 x 13.0 in)
Weight9.9 kg (21.8 lbs)8.2 kg (18.1 lbs)
Power Requirements90-254 VAC, 45-65 Hz, 580 W90-254 VAC, 45-65 Hz, 1200 W
Mechanical TestingVibration: 2 g (10-500 Hz), 30 min for 2 sides
Impact: 4 g three times
Drop test: 500 mm (19.6 in)
CommunicationUSB A, USB B, RJ45, WiFi, Bluetooth
LocalizationEnglish, Chinese, Japanese, Russian, German, French, Italian, and Spanish
Warranty1 year
Input Specifications (Process Calibrator [PC] Option)
Readout Accuracy for 100 ohm PRT (Probe Accuracy Not Included)±0.009°C at -40°C
±0.010°C at 0°C
±0.012°C at 50°C
±0.017°C at 155°C
±0.019°C at 200°C
±0.026°C at 350°C
±0.030°C at 420°C
±0.042°C at 660°C
Readout Resolution0.5 mΩ
Reference Resistance Range0Ω to 400Ω
Reference Resistance Accuracy0Ω to 50Ω: 0.002Ω
50Ω to 400Ω: 0.008% RD
Reference CharacterizationsITS-90, CVD, IEC-751, Resistance
Reference Measurement Capability4-wire PRT
Reference Probe Connection6-pin lemo smart connector
RTD Channels2
RTD Measurement Accuracy (excl sensor) Compliance0Ω to 25Ω: 0.002Ω
25Ω to 400Ω: 0.004% RD
400Ω to 4K Ω: 0.008% RD
RTD Measurement Resolution0Ω to 400Ω: 1 mΩ
400Ω to 4K Ω: 0.01Ω
RTD Measurement Resistance Range0Ω to 4KΩ
RTD CharacterizationsPT10, PT25, PT50, PT100, PT200, PT500, PT1000, CU10, CU50, CU100, NI100, NI120
RTD ConnectionFour 4 mm input jacks
RTD Channels2 channels. Both accept 2, 3, or 4-wire RTDs
TC Channel2
TC Measurement ChannelsMini TC terminals: Accepting S, R, K, B, N, E, J, T, C, D, G, L, and U
TC Measurement Accuracy (excl sensor)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–75 mV to 75 mV
TC Resolution0.0001 mV, Input Impedance >100 MΩ
TC Voltage Accuracy0.02% RD + 5 μV
Internal CJC Accuracy±0.35°C (ambient from 0°C to 50°C)
Current Range–30 mA to 30 mA
Current Accuracy0.02% RD + 2 μA
Current Resolution0.0001 mA, Input Impedance: < 10Ω
Voltage Ranges–12 V to 12 V and –30 V to 30 V
Voltage Accuracy±0.02% RD + 2 mV
Voltage Resolution0.001 V; Input impedance: > 1MΩ
Switch TestMechanical or Electrical
DC 24V Output24V ±10%, MAX60 mA
Hart CommunicatorRead, configure and calibrate HART devices - DD files updated periodically Optional - (order ADT875PC)
DocumentationUp to 1,000 tasks which store up to 10 results each containing as found and as left data. Snap shot feature allows for screen captures. Records auto step and ramp functions.
Temperature Coefficient 0°C to 8°C and 38°C to 50°CADT875 (PC)-155: ±0.005°C/°C
ADT875 (PC)-350/660: ±0.01°C/°C
Ref Readout: ±5 ppm FS/°C
RTD Readouts: ±2 ppm FS/°C
TC Readouts: ±5 ppm FS/°C
Current: ±5 ppm FS/°C
Voltage: ±5 ppm FS/°C
TC Measurement Specification and Calculation (Process Calibrator [PC] Option)
TC TypeTemperature (°C)Error (°C)[1]
[1] Excluding cold junction compensation errors.
Secondary PRT Information
SpecificationAM1710 SeriesAM1730 SeriesAM1751 SeriesAM1760 Series
Temperature Range [3]-60°C to 160°C-200°C to 420°C-200°C to 670°C-200°C to 670°C
Resistance at 0°CNominal 100Ω
Temperature Coefficient0.003925 Ω / Ω / °C
Calibrated Accuracy (k=2)[2][3]±0.025°C at -40°C±0.025°C at -40°C±0.025°C at -40°C±0.010°C at -196°C
±0.015°C at 0.01°C±0.015°C at 0.01°C±0.015°C at 0.01°C±0.006°C at 0.01°C
±0.025°C at 160°C±0.035°C at 420°C±0.035°C at 420°C±0.015°C at 420°C
±0.05°C at 661°C±0.025°C at 661°C
Drift±0.01°C at TPW after 100 hours at 160°C±0.01°C at TPW after 100 hours at 420°C±0.01°C at TPW after 100 hours at 661°C±0.004°C at TPW after 100 hours at 661°C
Short Term Stability±0.007°C±0.002°C
Thermal Shock±0.005°C after (10) thermal cycles from minimum to maximum temperatures±0.002°C after (10) thermal cycles from minimum to maximum temperatures
Self-heating50 mW/°C0.0015°C at 0.5mA
Response Time9 seconds for 63% response to step change in water moving at 3 feet per second
Measurement Current0.5 mA or 1 mA
Sensor Length32 mm42 mm
Sensor Location5 mm from tip
Insulation Resistance>1000 MΩ at room temperature
Sheath MaterialStainless SteelInconeltm
0.25 in dia X 12 in (6.35 mm X 305 mm)0.25 in dia X 12 in (6.35 mm X 305 mm)0.25 in dia X 12 in (6.35 mm X 305 mm)0.25 in dia X 12 in (6.35 mm X 305 mm)
0.25 in dia X 12 in (6.35 mm X 305 mm), 90° bend at 7.4 inch (190 mm) from probe end0.25 in dia X 12 in (6.35 mm X 305 mm), 90° bend at 9.6 inch (245 mm) from probe end0.25 in dia X 12 in (6.35 mm X 305 mm), 90° bend at 9.6 inch (245 mm) from probe end0.25 in dia X 12 in (6.35 mm X 305 mm), 90° bend at 9.6 inch (245 mm) from probe end
External LeadsTeflontm –insulated copper wire, 4 leads, 0.8 meters
Handle Dimension15 mm (OD) x 65 mm (L)
Handle Temperature Range[1]-50°C to 160°C-50°C to 180°C
CalibrationNIST traceable calibration with data included. Accredited calibration available per request.
[1] Handle temperatures outside this range will cause damage to the probe.
[2] Includes calibration and 100 hour drift.
[3] Probe calibration ranges may differ from probe temperature ranges (see Calibrated Accuracy for calibration ranges).
*PRT Information from


File nameUpload DateSize
Additel 875 Dry Well Calibrator Datasheet 2018.5.4 2.2 MB
Additel 875 Dry Well Calibrator User Manual 2019.4.2 4.2 MB
Additel Hart Communication Manual 2020.7.28 0.4 MB

Update Packages:

File name Upload Date Size
Additel 875 Firmware Update Package 2021.1.13 12.5 MB
HART Temperature Library Update Package 2019.6.5 50.7 MB
HART Pressure Library Update Package 2019.6.5 138.4 MB