The Additel ADT 878-425 Reference Dry Well Calibrator is a high precision temperature calibrator for professional temperature calibration from 33 °C to 425 °C. As part of Additel’s high performance ADT 878 reference series, the instrument is specifically designed for applications requiring high temperature stability, excellent uniformity and reproducible measurement results. This makes the Additel ADT 878-425 particularly suitable for calibration laboratories, quality assurance, research and development and demanding industrial applications.

Across the entire specified temperature range, the Additel ADT 878-425 provides a display accuracy of ±0.2 °C. Stability is ±0.010 °C at 100 °C, ±0.015 °C at 225 °C and ±0.020 °C at 425 °C. Excellent axial and radial temperature uniformity provides ideal conditions for high quality comparison calibrations of resistance thermometers, PRT sensors, RTD sensors and thermocouples.

With a temperature resolution of 0.001 °C, even small temperature changes can be monitored in detail. Under specified conditions, the ADT 878-425 reaches 425 °C from 23 °C in approximately 15 minutes. Typical stabilization time is around 10 minutes. This makes the reference calibrator suitable for calibration procedures involving multiple temperature points and high sample throughput.

At europascal, the Additel ADT 878-425 is available with expert support for selecting the appropriate configuration, inserts, reference probes and options for your individual temperature calibration requirements.

Your Benefits at a Glance

• Temperature range from 33 °C to 425 °C
• Reference dry well calibrator for demanding applications
• Display accuracy of ±0.2 °C across the entire temperature range
• Stability of ±0.010 °C at 100 °C
• Stability of ±0.015 °C at 225 °C
• Stability of ±0.020 °C at 425 °C
• Temperature resolution of 0.001 °C
• Excellent axial temperature uniformity
• Excellent radial temperature uniformity
• Dual zone temperature control
• Typical stabilization time of approximately 10 minutes
• Heating time of approximately 15 minutes from 23 °C to 425 °C
• Cooling time of approximately 24 minutes from 425 °C to 100 °C
• Large immersion depth for professional comparison calibrations
• Interchangeable inserts for different temperature probes
• 6.5 inch color touchscreen
• Display in °C, °F and K
• USB A and USB B
• LAN via RJ45
• WiFi and Bluetooth
• Optionally available as a Process Calibrator
• External reference PRT with Process Calibrator Option
• Two RTD measurement channels
• Two thermocouple measurement channels
• HART communication with corresponding option
• Calibration task documentation
• Self calibration function
• ISO/IEC 17025 accredited calibration with measurement data supplied from the factory

Ideal for Demanding Calibration Applications

The Additel ADT 878-425 Reference Dry Well Calibrator is designed for users who require more from a temperature source than a conventional industrial dry well calibrator can provide. Additel specifically positions the ADT 878 series as a Reference Dry Well Calibrator series.

The temperature range from 33 °C to 425 °C covers numerous typical calibration points in industrial and laboratory applications. Its high temperature stability and uniformity make the instrument particularly suitable for high quality comparison calibrations.

Typical applications include:

• DAkkS accredited calibration laboratories
• Reference and secondary calibration laboratories
• In house calibration laboratories
• Quality assurance
• Research and development
• Temperature sensor manufacturers
• Energy supply
• Process industries
• Pharmaceutical industry
• Food industry
• Mechanical and plant engineering
• Aerospace applications
• Production and manufacturing testing

The ADT 878-425 can be used to compare and calibrate high quality PRT sensors, resistance thermometers, RTD sensors and suitable thermocouples under controlled thermal conditions.

For regular calibration of your temperature measuring equipment, europascal also provides a professional Calibration Service for temperature and other measurement quantities.

Flexible Expansion

The Additel ADT 878-425 can be adapted to different calibration tasks using various inserts and optional configurations. Interchangeable inserts accommodate different probe diameters and provide excellent flexibility in professional calibration laboratories.

For applications requiring additional measurement capabilities, the ADT 878 is also available as a Process Calibrator version. This configuration expands the high quality reference temperature source with an input for an external reference PRT and two independent measurement channels for devices under test.

The two RTD channels support 2 wire, 3 wire and 4 wire resistance thermometers. Two thermocouple measurement channels are also available. Different temperature probes can therefore be connected directly to the calibrator and evaluated.

The Process Calibrator Option also enables electrical measurements. Current, voltage and switch states can be measured, while an integrated 24 V supply can power suitable temperature transmitters.

With the HART option, compatible intelligent transmitters can be read, configured and calibrated directly. This allows the ADT 878-425 to function not only as a highly stable temperature source but also as a comprehensive platform for complete temperature calibration procedures.

Documentation functions enable management of up to 1,000 calibration tasks. As Found and As Left results can be stored, allowing recurring calibration procedures to be documented in a structured manner.

Technical Highlights

Temperature range: 33 °C to 425 °C

Display accuracy: ±0.2 °C across the entire range

30 minute stability at 100 °C: ±0.010 °C

30 minute stability at 225 °C: ±0.015 °C

30 minute stability at 425 °C: ±0.020 °C

Axial uniformity at 60 mm and 100 °C: ±0.10 °C

Axial uniformity at 60 mm and 225 °C: ±0.15 °C

Axial uniformity at 60 mm and 425 °C: ±0.25 °C

Axial uniformity at 80 mm and 100 °C: ±0.15 °C

Axial uniformity at 80 mm and 225 °C: ±0.20 °C

Axial uniformity at 80 mm and 425 °C: ±0.30 °C

Radial uniformity at 100 °C: ±0.025 °C

Radial uniformity at 225 °C: ±0.030 °C

Radial uniformity at 425 °C: ±0.040 °C

Temperature resolution: 0.001 °C

Heating time from 23 °C to 425 °C: Approx. 15 minutes

Cooling time from 425 °C to 100 °C: Approx. 24 minutes

Typical stabilization time: Approx. 10 minutes

Temperature control: Dual zone

Display: 6.5 inch color touchscreen

Communication: USB, LAN, WiFi and Bluetooth

Process Calibrator: Optional

HART communication: Optional

Technical Specifications

Why Choose the Additel ADT 878-425?

The Additel ADT 878-425 combines a temperature range suitable for numerous industrial and metrological applications with excellent stability and temperature uniformity. These characteristics are particularly important for achieving reproducible results in high quality comparison calibrations.

Display accuracy is ±0.2 °C across the entire range from 33 °C to 425 °C. For comparison calibrations, however, temperature source stability is especially important. At 100 °C, the ADT 878-425 achieves a specified stability of ±0.010 °C. Even at the upper end of the operating range at 425 °C, stability is only ±0.020 °C.

Temperature uniformity also supports high quality comparison measurements. At 425 °C, specified radial uniformity is ±0.040 °C, while axial uniformity over a 60 mm measurement length is ±0.25 °C.

Another advantage is the rapid temperature change. Starting at 23 °C, the reference calibrator reaches 425 °C in approximately 15 minutes. Cooling from 425 °C to 100 °C takes approximately 24 minutes. Typical stabilization time is approximately 10 minutes.

The high resolution of 0.001 °C enables detailed monitoring of temperature changes. At the same time, the large 6.5 inch color touchscreen simplifies operation during everyday laboratory use.

With the optional Process Calibrator configuration, the ADT 878-425 can be expanded into a comprehensive calibration platform. Reference probes, RTDs, thermocouples and transmitters can then be connected and measured directly.

Additional Models in the Additel ADT 878 Series

The Additel ADT 878-425 covers the medium temperature range within the ADT 878 reference dry well series. Depending on the calibration application, additional models are available for lower and higher temperatures.

For applications below ambient temperature, the Additel ADT 878-160 covers a temperature range from −40 °C to 160 °C and provides excellent stability of ±0.005 °C across its temperature range.

The ADT 878-160 can also be combined with the ADT878-TPW-KIT. This specialized accessory enables automatic realization and maintenance of the triple point of water at 0.01 °C.

For temperatures above 425 °C, the Additel ADT 878-700 extends the working range up to 700 °C and additionally provides an integrated automatic annealing function for high quality PRT sensors.

Users can therefore select between the ADT 878-160, ADT 878-425 and ADT 878-700 according to the required temperature range.

europascal can assist you in selecting the appropriate reference calibrator based on your required temperature range, sensor types and target measurement uncertainty.

Additel ADT 878-425 or ADT 875-350?

For many applications, a model from the ADT 875 series may also be considered alongside the Additel ADT 878-425. While the ADT 875 series is designed as a high performance standard dry well series, Additel positions the ADT 878 as its reference dry well series for higher metrological requirements.

The Additel ADT 875-350 covers a temperature range from 33 °C to 350 °C and is suitable for numerous industrial and professional calibration applications.

The Additel ADT 878-425 extends the range up to 425 °C while providing particularly high temperature stability and uniformity. For calibration laboratories and users with higher requirements for the reference temperature source, the ADT 878-425 provides the corresponding reference level solution.

The appropriate series depends on factors such as the required measurement uncertainty, temperature range, reference probes used and number of calibrations to be performed.

Typical Calibration Applications with the Additel ADT 878-425

The Additel ADT 878-425 Reference Dry Well Calibrator is particularly suitable for high quality comparison calibrations of resistance thermometers, PRT sensors, RTD sensors and suitable thermocouples.

During a typical comparison calibration, a reference probe and the sensors to be calibrated are positioned in a suitable insert. Once the required temperature setpoint has been selected and stable conditions have been achieved, the readings from the reference and devices under test can be compared.

The high stability and uniformity of the ADT 878-425 support reproducible measurement results. Particularly when high quality reference PRTs are used, optional external reference measurement provides additional capabilities for demanding calibration applications.

With the Process Calibrator Option, reference probes, RTDs and thermocouples can be measured directly by the instrument. Temperature switches and temperature transmitters can also be integrated into the calibration process. HART functionality additionally supports compatible intelligent temperature transmitters.

For lower temperatures, the Additel ADT 878-160 is available. For temperatures above 425 °C, the Additel ADT 878-700 extends the operating range up to 700 °C.

For regular metrological traceability of your temperature calibrators and temperature probes, use the europascal Calibration Service.

Discover more Additel products here.

Manufacturer information about the Additel ADT 878-425 is available on the official Additel website.

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