Video Demo


• Temperature control from -40℃ to 160℃

• Reference level performance in accuracy, stability and uniformity

• Quick to temperature

• Two-channel readout measures RTDs and TCs, and provides task documentation

• Full HART communicator

• Wi-Fi and Bluetooth capable

• Color touch screen display

• Quick-Push connectors (PC Option)

• Set point control by reference

• Self-calibration feature

• Optional TPW kit for built-in automatic realization (ADT878-160 only)

• Built-in automatic annealing feature (ADT878-700 only)

We are taking temperature calibration to the next level with the Additel 878 Reference Dry Well Calibrators. If you are looking for the best dry well on the market, then look no further! Additel’s commitment to continuous improvement, quality and time saving features are on full display in the ADT878 series. With three models to choose from, ranging from -40 to 700°C, you will find the perfect fit for your calibration needs. The Process Calibrator option adds an external reference input, a two-channel readout for UUT’s and a full complement of capabilities to help with everything from measuring temperature sensors, to calibrating thermocouples, self-calibrating the Reference Well and configuring HART transmitters. Each unit comes standard with a large touchscreen display, dual-zone control and Additel’s commitment to the best customer service in the industry. We are certain that you will be blown away by the outstanding performance of these game-changing Reference Dry Wells!


Process Calibrator Option

Each model can be purchased with our Process Calibrator (PC) option. This option combines the many features found in a fully functional HART documenting process calibrator with the reference grade dry well. This option includes the ability to measure a reference PRT, with virtually any connection type, and two device 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 communication with HARTsmart transmitters. The process calibrator option also has an on board full HART communicator which allows users to read, configure and calibrate HART 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. 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.


Automation Features

Traditionally, dry wells were simply a stable heat source. To enhance the usability of our Reference Dry Wells, we've added automation features enabling you to utilize these amazing devices as a highly stable heat source, triple point of water maintenance apparatus, and annealing furnace. Combined with the ADT878-TPW-KIT, the ADT878-160 Reference Dry Well can be used to automatically realize and maintain a triple point of water cell. Traditional methods take time and practice to realize the triple point of water. Additel has now simplified this process with an automatic TPW realization feature. Simply insert the cell and PRT into the Reference Dry Well and run the procedure. The automation in the firmware will alert when the cell is super cooled. Remove the cell and give it a shake and now you can maintain the triple point in the reference well. This is very useful to check the drift of your PRT. For more information, please see our ADT878-TPW-KIT data sheet. When you purchase our 700°C Reference Dry Well, you will find our automatic annealing feature used to anneal PRTs. We have preconfigured annealing procedures that set the temperature annealing time and cool down rate. This feature, also lets you create your own annealing procedures.



Reference Dry Well Specifications
Temperature Range at 23°C-40°C to 160°C33°C to 425°C33°C to 700°C
Display Accuracy±0.1°C at Full Range±0.2°C at Full Range±0.20°C at 33°C
±0.20°C at 425°C
±0.25°C at 660°C
Stability (30 min)±0.005°C at Full Range±0.005°C at 100°C±0.005°C at 100°C
±0.010°C at 225°C±0.015°C at 425°C
±0.015°C at 425°C±0.030°C at 700°C
Axial Uniformity at 60 mm (2.4 in)±0.025°C at -40°C±0.10°C at 100°C±0.10°C at 100°C
±0.020°C at 0°C±0.15°C at 225°C±0.25°C at 425°C
±0.050°C at 160°C±0.25°C at 425°C±0.40°C at 700°C
Axial Uniformity at 80 mm (3.15 in)±0.050°C at -40°C±0.15°C at 100°C±0.15°C at 100°C
±0.040°C at 0°C±0.20°C at 225°C±0.30°C at 425°C
±0.050°C at 160°C±0.30°C at 425°C±0.60°C at 700°C
Radial Uniformity±0.01°C at Full Range±0.025°C at 100°C±0.025°C at 100°C
±0.030°C at 225°C±0.040°C at 425°C
±0.040°C at 425°C±0.060°C at 700°C
Loading Effect±0.08°C (Display Sensor)±0.05°C (Display Sensor)±0.02°C at 100°C
±0.05°C at 425°C
±0.15°C at 700°C
±0.010°C (External Sensor)±0.01°C (External Sensor)±0.01°C at 100°C
±0.02°C at 425°C
±0.03°C at 700°C
Hysteresis (Display Sensor)0.025°C0.04°C0.07°C
Environmental Conditions8°C to 38°C guaranteed accuracy
0°C to 50°C, 0% to 90% RH non-condensing
Storage Conditions-20°C to 60°C
IP RatingIP20
Immersion Depth160 mm (1.30 in)193 mm (7.60 in)
Insert OD31.9 mm (1.26 in)30.8 mm (1.21 in)
Heating Time4 min: -40°C to 23°C15 min: 23°C to 425°C25 min: 23°C to 700°C
10 min: 23°C to 160°C
Cooling Time8 min: 160°C to 23°C24 min: 425°C to 100°C30 min: 700°C to 100°C
15 min: 23°C to -40°C15 min: 100°C to 50°C15 min: 100°C to 50°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)170 x 345 x 330 mm (6.69 x 13.58 x 13.0 in)
Weight11.2 kg (24.7 lbs)9.7 kg (21.4 lbs)
Power Requirements90-254 VAC, 45-65 Hz, 580 W90-25 VAC, 45-65 Hz, 1400 W
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)±0.005°C at -40°C
±0.006°C at 0°C
±0.008°C at 50°C
±0.009°C at 100°C
±0.011°C at 160°C
±0.015°C at 300°C
±0.019°C at 425°C
±0.026°C at 660°C
±0.028°C at 700°C
Readout Resolution0.1 mΩ
Reference Resistance Temperature Measurement Range-200°C to 926°C
Reference Resistance Accuracy0Ω to 50Ω: ±1.25mΩ
50Ω to 400Ω: ±0.0025% RD
Reference CharacterizationsITS-90, CVD, IEC-751
Reference Measurement Capability4-wire PRT
Reference Probe Connection6-pin lemo smart connector and Quick-Push connectors to accept banana, mini-banana, large & small spade lug and bare wire connections
RTD Channels2 channels. Both accept 2, 3, or 4-wire RTDs
RTD Measurement Accuracy (excl sensor)0Ω - 25Ω: ±0.002Ω
25Ω - 400Ω: 0.004% RD
400Ω - 4kΩ: 0.005% RD
RTD Measurement Resolution0.1mΩ
RTD Measurement Resistance Range0Ω to 4KΩ
RTD CharacterizationsPT10, PT25, PT50, PT100, PT200, PT500, PT1000, CU10, CU50, CU100, NI100, NI120
RTD ConnectionQuick-Push connectors accept banana, mini-banana, large & small spade lug and bare wire connections.
TC Channel2
TC Measurement ChannelsAccepting S, R, K, B, N, E, J, T, C, D, G, L, and U
TC Range-75 mV to 75 mV
TC Resolution0.1µV
TC Voltage Accuracy0.01% RD + 5 µV
Internal CJC Accuracy±0.2°C (ambient from 0°C to 50°C)
Current Range-30 mA to 30 mA
Current Accuracy0.01% RD + 2 µA
Current Resolution0.1 µA, Input Impedance: < 10Ω
Voltage Range-12 V to 12 V and –30 V to 30 V
Voltage Accuracy±0.01% RD + 0.6 mV
Voltage Resolution0.1 mV; Input impedance: >1MΩ
Switch TestMechanical or Electrical
DC 24V Output24 V ±0.5 V, MAX 60 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 13°C and 33°C to 50°C)ADT878 (PC)-160: ±0.005°C/°C
ADT878 (PC)-425/700: ±0.005°C/°C
Ref Readout: ±1 ppm FS/°C
RTD Readouts: ±1 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
Uncertainty<0.0005°C [1]
Immersion depth/ID115 mm X 8 mm
External Dimensions160 mm X 25 mm
Cell materialBorosilicate Glass
Realization time20 mins
Estimated working time2 hours
Recommended thermal FluidEthanol
Warranty1 year


File nameUpload DateSize
Additel 878 Dry Well Calibrator Datasheet 2020.9.22 1.6 MB
Additel 878 Dry Well Calibrator User Manual 2021.2.2 1.6 MB
Additel 878-TPW-KIT Triple Point of Water Realization Kit Datasheet 2020.9.22 0.7 MB
Additel Short Probe Temperature Calibration Kit Datasheet 2019.6.19 0.6 MB
Additel Hart Communication Manual 2020.7.28 0.4 MB

Update Packages:

File name Upload Date Size
Additel 878 Firmware Package 2021.1.13 14.6 MB