The Additel ADT 878 Reference Dry Well Calibrator is a high precision temperature calibration solution designed for demanding applications in calibration laboratories, quality assurance, research and industrial metrology. The series combines excellent temperature stability and uniformity with automated calibration functions, a large color touchscreen and optional integrated process measurement capabilities. The product family includes the ADT 878-160, ADT 878-425, ADT 878-700 and ADT 878-1210, covering an overall temperature range from −40 °C to 1,210 °C.

Unlike the standard ADT 875 series, the Additel ADT 878 is designed as a reference dry well calibrator. Additel places particular emphasis on accuracy, stability and both axial and radial temperature uniformity. This makes the ADT 878 series particularly suitable for applications where the requirements for the temperature reference go beyond a basic functional test of temperature sensors.

The ADT 878-160 covers temperatures from −40 °C to 160 °C and achieves a display accuracy of ±0.1 °C over the entire range. Its 30 minute stability is only ±0.005 °C. This makes it an excellent choice for precise calibration of Pt100 probes, resistance thermometers, digital thermometers and temperature transmitters.

The ADT 878-425 extends the temperature range from 33 °C to 425 °C. Additel specifies a display accuracy of ±0.2 °C across the entire range. Stability is ±0.010 °C at 100 °C, ±0.015 °C at 225 °C and ±0.020 °C at 425 °C.

For higher temperatures, the ADT 878-700 provides a range from 33 °C to 700 °C. Its display accuracy is ±0.20 °C at 33 °C and 425 °C and ±0.25 °C at 660 °C. Stability ranges from ±0.010 °C at 100 °C to ±0.030 °C at 700 °C. A special feature of this model is its integrated automatic function for annealing PRTs.

The ADT 878-1210 extends the series into the high temperature range. This thermocouple calibration furnace operates from 100 °C to 1,210 °C and achieves a display accuracy of ±1.5 °C across the entire range. Its multi zone temperature control is designed to provide a highly stable and uniform heat source for thermocouple calibration.

A key feature of the ADT 878 series is the optional Process Calibrator Option, PC. It adds an input for an external reference PRT and two measurement channels for devices under test. These channels support resistance thermometers, thermocouples, current, voltage and switches. Documentation functions and a full HART communicator are also available.

This transforms the temperature source into a comprehensive temperature calibration workstation. Setpoint, reference probe and devices under test can be handled within a single system. Calibration tasks can be documented and results stored as As Found and As Left data.

Another important feature is the Self Calibration function. An external reference probe can be used to automatically check and readjust the internal control sensor. This can reduce the influence of long term drift of the internal sensor.

europascal supports you in selecting the appropriate ADT 878 model, suitable inserts and reference thermometers. For the regular metrological traceability of your temperature calibrators and temperature probes, you can also use the europascal Calibration Service.

Your Benefits at a Glance

• Reference dry well calibrator for demanding temperature calibrations
• Overall series temperature range from −40 °C to 1,210 °C
• Four temperature variants
• ADT 878-160 from −40 °C to 160 °C
• ADT 878-425 from 33 °C to 425 °C
• ADT 878-700 from 33 °C to 700 °C
• ADT 878-1210 from 100 °C to 1,210 °C
• Display accuracy down to ±0.1 °C
• Stability down to ±0.005 °C
• Excellent axial and radial temperature uniformity
• Interchangeable inserts
• Large color touchscreen
• Control using an internal or external reference probe
• Automatic self calibration
• Optional process calibrator functions
• RTD and thermocouple measurement
• Current and voltage measurement with PC option
• HART communication with PC option
• Calibration task documentation
• WiFi and Bluetooth capability
• ISO/IEC 17025 accredited calibration with measurement data included
• Automatic water triple point function with the ADT 878-160
• Automatic PRT annealing function with the ADT 878-700

Ideal for Demanding Calibration Applications

The Additel ADT 878 Reference Dry Well Calibrator is particularly suitable for applications requiring not only a stable heat source but also low measurement uncertainty and excellent temperature uniformity.

During comparison calibration, the reference thermometer and device under test are inserted into the dry well insert. Once the required setpoint has been reached and sufficient stabilization time has elapsed, the readings of the reference and device under test can be compared.

With the optional process calibrator configuration, these tasks can be performed directly with the ADT 878. The external reference probe can be measured while two device under test channels are processed simultaneously.

This makes the series suitable for resistance thermometers, Pt100 and Pt1000 probes, thermocouples, temperature transmitters, temperature switches and digital thermometers.

Flexible Expansion

The Additel ADT 878 can be adapted to different calibration requirements using various inserts, reference probes and the optional process calibrator configuration.

With the PC option, two additional device under test channels are available in addition to the reference input. Supported measurements include RTDs, thermocouples, mA and voltage. Switch testing is also possible.

The platform additionally supports data logging, automated test procedures and HART communication. This enables the dry well to be integrated into automated and documenting calibration processes.

Additel ADT 878 Series Models

Additel ADT 878-160

The Additel ADT 878-160 operates from −40 °C to 160 °C. Its display accuracy is ±0.1 °C over the entire range, with a 30 minute stability of ±0.005 °C.

A special feature is the optional automatic realization of a water triple point. Together with the ADT878-TPW-KIT, the calibrator can automatically realize a water triple point cell and subsequently maintain its temperature. This can be used, for example, to check the drift of a PRT.

Additel ADT 878-425

The Additel ADT 878-425 offers a temperature range from 33 °C to 425 °C and a display accuracy of ±0.2 °C across the entire range.

Its stability is ±0.010 °C at 100 °C, ±0.015 °C at 225 °C and ±0.020 °C at 425 °C.

This makes the model particularly suitable for high quality comparison calibrations of industrial resistance thermometers, reference probes and temperature transmitters.

Additel ADT 878-700

The Additel ADT 878-700 extends the operating range from 33 °C to 700 °C.

Display accuracy is ±0.20 °C at 33 °C and 425 °C and ±0.25 °C at 660 °C. Stability is ±0.010 °C at 100 °C, ±0.020 °C at 425 °C and ±0.030 °C at 700 °C.

A special feature is the integrated automatic PRT annealing function. Preconfigured procedures define temperature, annealing time and cooling rate. Custom procedures can also be created.

Additel ADT 878-1210

The Additel ADT 878-1210 is the high temperature version for 100 °C to 1,210 °C.

The unit is specifically designed as a thermocouple calibration furnace. Display accuracy is ±1.5 °C across the entire range. Multi zone temperature control combines three zone control with Additel’s Advanced Adaptive Control to improve stability and temperature uniformity within the working area.

Interchangeable metal inserts allow adaptation to different thermocouples and device diameters.

Technical Highlights

Overall temperature range: −40 °C to 1,210 °C

ADT 878-160: −40 °C to 160 °C

ADT 878-425: 33 °C to 425 °C

ADT 878-700: 33 °C to 700 °C

ADT 878-1210: 100 °C to 1,210 °C

Best display accuracy: ±0.1 °C

Best stability: ±0.005 °C

Reference probe: Connectable

External reference control: Available

Self Calibration: Available

Process Calibrator: Optional

HART: With PC option

Documentation: With PC option

Display: Color touchscreen

Communication: WiFi and Bluetooth capable

Calibration: ISO/IEC 17025 accredited calibration with measurement data included

Technical Specifications

High Precision Reference Temperature Calibration

The Additel ADT 878 is designed for applications where the performance of a conventional dry well calibrator is not sufficient.

The ADT 878-160’s stability of ±0.005 °C demonstrates the reference level performance of the series. Additel also specifies both axial and radial temperature uniformity.

For demanding comparison calibrations, an external reference probe can be positioned directly next to the device under test. This allows the actual temperature at the measurement location to be determined.

Automatic Self Calibration

An important function of the Additel ADT 878 is automatic self calibration.

An external reference probe is used to check the internal control sensor. The calibrator can perform the procedure largely automatically.

This can reduce the influence of long term drift of the internal sensor and improve confidence in measurements using the internal reference.

Process Calibrator and HART

With the optional PC configuration, the ADT 878 becomes a comprehensive temperature calibration workstation.

One reference PRT and two devices under test can be connected. The device channels support RTDs, thermocouples, mA, voltage and switches.

A full HART communicator, task management, As Found and As Left documentation and data logging are also available.

This is particularly useful for temperature transmitters because the heat source, reference measurement and electrical signal evaluation can be combined within one system.

Automatic Water Triple Point Realization

A special feature of the ADT 878-160 is its support for the optional ADT878-TPW-KIT.

The system can automatically realize a water triple point cell and subsequently maintain it in the reference dry well. This function can be used for regular drift checks of high quality PRT reference thermometers.

Automatic PRT Annealing

The ADT 878-700 provides an automatic annealing function.

Annealing can be used with high quality platinum resistance thermometers to reduce mechanical and thermal stresses and improve sensor stability.

The ADT 878-700 includes preconfigured programs for this purpose. Users can also define custom temperature, time and cooling profiles.

europascal Calibration Service

Reliable and traceable temperature measurements require both reference probes and temperature calibrators to be calibrated regularly.

Through the europascal Calibration Service, temperature calibrators, resistance thermometers, thermocouples, temperature transmitters and other temperature measuring instruments can be metrologically calibrated.

europascal can also assist you in selecting the appropriate Additel ADT 878, suitable inserts and reference probes and in configuring a complete temperature calibration workstation.

Why Choose the Additel ADT 878?

The Additel ADT 878 Reference Dry Well Calibrator combines the convenient operation of a dry well calibrator with performance designed for demanding reference calibrations.

Together, the four models cover a temperature range from −40 °C to 1,210 °C.

For particularly precise applications, the ADT 878-160 provides stability down to ±0.005 °C. The ADT 878-425 extends the range to 425 °C. The ADT 878-700 reaches 700 °C and additionally offers automatic PRT annealing. For high temperature thermocouples, the ADT 878-1210 extends the series to 1,210 °C.

The optional process calibrator configuration with reference input, two device under test channels, HART, data logging and documentation considerably expands the available applications.

This makes the Additel ADT 878 series particularly suitable for calibration laboratories with demanding requirements for stability, temperature uniformity, automation and documentation.

Typical Calibration Applications with the Additel ADT 878

The Additel ADT 878 is particularly suitable for calibration and testing of:

• Reference PRTs
• Pt100 temperature probes
• Pt1000 temperature probes
• Resistance thermometers
• Thermocouples
• Digital reference thermometers
• Temperature transmitters
• Temperature switches
• Industrial temperature probes
• High quality reference sensors

The ADT 878-160 is particularly suitable for high accuracy applications at low and ambient temperatures. The ADT 878-425 covers a broad range of industrial applications. The ADT 878-700 is suitable for high temperature PRTs and thermocouples, while the ADT 878-1210 extends the series to thermocouple calibrations up to 1,210 °C.

The Additel ADT 878 series therefore provides a powerful platform for professional reference temperature calibration.

Discover more Additel products on the europascal Additel product page.

Manufacturer information about the Additel ADT 878 is available on the official Additel website.

Manufacturer information about the high temperature Additel ADT 878-1210 is available on the official Additel 87X-1210 product page.

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