Additel ADT 875-1210 is a versatile thermocouple calibration furnace designed for professional high-temperature calibration from 100 °C to 1210 °C. Combining advanced multi-zone temperature control, excellent stability, interchangeable metallic inserts and a modern color touchscreen interface, the ADT 875-1210 provides a professional solution for calibrating thermocouples used in demanding industrial and laboratory applications.
The Additel ADT 875-1210 is the standard-performance model in Additel’s 1210 °C thermocouple furnace series. It provides a display accuracy of ±1.2 °C at 100 °C, 300 °C and 600 °C, ±1.6 °C at 900 °C and ±2.0 °C at 1210 °C. Temperature stability is specified at ±0.1 °C throughout the operating range. These characteristics make the furnace particularly suitable for comparison calibration and verification of industrial thermocouples.
A key feature of the Additel ADT 875-1210 is Additel’s Advanced Adaptive Control technology. This system combines advanced wind-tunnel control technology with three-zone temperature control to optimize stability and temperature uniformity. The result is a controlled high-temperature environment designed to minimize axial and radial temperature gradients as well as loading effects.
The ADT 875-1210 can also be ordered with Additel’s optional Process Calibrator electronics. The ADT 875PC-1210 adds multiple thermocouple measurement channels, electrical measurement functions, switch testing, 24 V loop power, task documentation and HART communication, transforming the furnace into an integrated high-temperature calibration workstation.
At europascal, the Additel ADT 875-1210 complements a comprehensive portfolio of professional temperature calibration equipment. In addition to supplying Additel temperature calibration technology, europascal provides accredited calibration services for temperature and other measurement quantities. Find more information about professional calibration and metrological traceability at the europascal Calibration Service.
Your Benefits at a Glance
The Additel ADT 875-1210 combines a high maximum temperature with excellent stability and flexible thermocouple calibration capabilities.
Key advantages include:
- Temperature range from 100 °C to 1210 °C
- Professional thermocouple calibration furnace
- Display accuracy up to ±2.0 °C at 1210 °C
- Temperature stability of ±0.1 °C
- Advanced Adaptive Control
- Three-zone temperature control
- Advanced wind-tunnel control technology
- Excellent axial temperature uniformity
- Excellent radial temperature uniformity
- Low loading effect
- Interchangeable metallic inserts
- Multiple insert configurations available
- Color touchscreen display
- Wi-Fi capability
- Bluetooth capability
- USB communication
- Optional integrated process calibrator
- Four device-under-test thermocouple channels with PC option
- Dedicated reference thermocouple channel with PC option
- Current and voltage measurement with PC option
- 24 V loop power with PC option
- Switch testing with PC option
- HART communication with PC option
- Calibration task documentation
- External reference control with PC option
- Self-calibration functionality with PC option
- ISO 17025-accredited calibration with data included
Temperature Calibration from 100 °C to 1210 °C
The Additel ADT 875-1210 provides temperature generation from:
100 °C
to:
1210 °C.
This broad range makes the furnace suitable for thermocouples used in industrial processes where temperatures extend beyond the capabilities of conventional portable dry block calibrators.
Typical applications include:
- Type K thermocouple calibration
- Type N thermocouple calibration
- Type S thermocouple calibration
- Type R thermocouple calibration
- Type B thermocouple calibration
- Industrial thermocouple verification
- High-temperature sensor calibration
- Furnace sensor calibration
- Heat-treatment applications
- Laboratory temperature calibration
- Industrial temperature metrology
The 1210 °C upper temperature limit makes the ADT 875-1210 an attractive solution for laboratories that need to extend their calibration capabilities into the high-temperature range.
Display Accuracy up to 1210 °C
The Additel ADT 875-1210 provides specified display accuracy across its complete temperature range.
The manufacturer specifies:
±1.2 °C at 100 °C
±1.2 °C at 300 °C
±1.2 °C at 600 °C
±1.6 °C at 900 °C
±2.0 °C at 1210 °C.
These specifications refer to the internal temperature indication of the calibration furnace.
For demanding comparison calibrations, an external calibrated reference thermocouple can additionally be used to determine the reference temperature independently of the internal furnace indication.
Temperature Stability of ±0.1 °C
Temperature stability is one of the most important characteristics of a thermocouple calibration furnace.
The Additel ADT 875-1210 provides specified stability of:
±0.1 °C.
Stable temperature conditions allow the reference thermocouple and devices under test to be compared under consistent thermal conditions.
This becomes increasingly important at high temperatures, where furnace regulation, sensor loading and thermal gradients can significantly influence the calibration result.
Advanced Adaptive Control
The Additel ADT 875-1210 uses Additel’s Advanced Adaptive Control technology.
This innovative control concept combines:
advanced wind-tunnel control technology
with:
three-zone temperature control.
Instead of controlling the furnace as a single thermal zone, the system manages the temperature distribution to achieve improved stability and uniformity within the usable calibration region.
The technology is designed to improve:
- Temperature stability
- Axial temperature uniformity
- Radial temperature uniformity
- Response to sensor loading
- Overall calibration performance
This is particularly important when several thermocouples are inserted into the furnace simultaneously.
Axial Temperature Uniformity
The temperature along the insertion depth of a calibration furnace is not perfectly constant.
For the Additel ADT 875-1210, Additel specifies axial uniformity over a 20 mm zone of:
±0.6 °C at 100 °C
±1.2 °C at 300 °C
±1.5 °C at 600 °C
±1.5 °C at 900 °C
±1.5 °C at 1210 °C.
These values are particularly relevant when estimating the measurement uncertainty of a thermocouple comparison calibration.
Correct and repeatable immersion of both the reference thermocouple and the thermocouples under test is therefore essential.
Radial Temperature Uniformity
The Additel ADT 875-1210 also provides specified radial temperature uniformity.
Additel specifies:
±0.2 °C at 100 °C
±0.3 °C at 300 °C
±0.4 °C at 600 °C
±0.8 °C at 900 °C
±1.0 °C at 1210 °C.
Radial uniformity describes temperature differences between different positions within the insert.
This is particularly important when several thermocouples are calibrated simultaneously.
The reference sensor and devices under test should be positioned according to the calibration procedure so that radial temperature differences are appropriately considered.
Low Loading Effect
Inserting several thermocouples into a furnace changes the thermal conditions.
This is known as the loading effect.
For the Additel ADT 875-1210, the specified loading effect is:
±0.5 °C.
The Advanced Adaptive Control and multi-zone temperature control are designed to minimize this influence.
For professional calibration, loading should nevertheless be considered as part of the calibration procedure and measurement uncertainty analysis.
Interchangeable Metallic Inserts
The Additel ADT 875-1210 uses interchangeable metallic inserts.
Different insert configurations are available to accommodate thermocouples with different diameters.
This allows one furnace to be adapted to different sensor populations.
Appropriate bore diameter is important for good thermal contact between the thermocouple sheath and the insert while still allowing safe insertion and removal.
The interchangeable insert concept therefore provides both flexibility and practical advantages for calibration laboratories handling different sensor designs.
Designed for Thermocouple Calibration
The Additel ADT 875-1210 is specifically designed for high-temperature thermocouple calibration.
Thermocouples are commonly used in applications such as:
- Industrial furnaces
- Heat-treatment equipment
- Metal processing
- Glass manufacturing
- Ceramics
- Power generation
- Process plants
- Research laboratories
- High-temperature test systems
The ADT 875-1210 provides a controlled heat source for comparing these sensors with an appropriate calibrated reference thermocouple.
Comparison Calibration with a Reference Thermocouple
A typical professional calibration setup consists of:
Additel ADT 875-1210 + Reference Thermocouple + Thermocouple Under Test
The reference thermocouple and device under test are inserted into the furnace at comparable immersion depths.
The furnace is set to the required calibration temperature.
After sufficient stabilization, the reference temperature and the thermoelectric voltage or indicated temperature of the device under test are recorded.
This procedure is repeated at the required calibration temperatures.
For professional calibration work, factors such as sensor immersion, furnace uniformity, stability, reference sensor uncertainty, thermocouple inhomogeneity and electrical measurement uncertainty must be considered.
Optional ADT 875PC-1210 Process Calibrator
The Additel ADT 875-1210 can be ordered with integrated process calibration electronics as the:
ADT 875PC-1210.
This option significantly expands the capabilities of the calibration furnace.
The process calibrator provides multiple measurement channels for thermocouples and electrical process signals.
Supported thermocouple types include:
- Type S
- Type R
- Type K
- Type B
- Type N
- Type E
- Type J
- Type T
- Type L
- Type U
This allows the furnace to generate the required temperature while simultaneously measuring the reference thermocouple and devices under test.
Four Device-Under-Test Channels
The process calibrator option provides:
four device-under-test thermocouple channels.
This enables several thermocouples to be calibrated during the same temperature cycle.
For laboratories handling larger batches of thermocouples, this can significantly improve productivity.
Instead of heating and cooling the furnace separately for every individual sensor, multiple devices can be compared with the reference during the same calibration sequence.
Dedicated Reference Thermocouple Channel
The PC option also provides a dedicated reference thermocouple channel.
This allows an external reference-grade thermocouple to be connected directly to the calibration furnace.
The reference thermocouple can then be used to determine the actual calibration temperature more accurately than relying solely on the furnace’s internal display.
The external reference can also be used for control functions, helping to reduce uncertainty contributions associated with the internal control sensor.
Electrical Measurement Functions
The ADT 875PC-1210 provides additional electrical measurement capabilities.
These include:
Current measurement from -30 mA to +30 mA
and voltage measurement ranges of:
-12 V to +12 V
and:
-30 V to +30 V.
The process calibrator also provides:
24 V DC loop power
with a maximum output current of 60 mA.
These capabilities make the system suitable not only for thermocouples but also for temperature transmitters and process instrumentation.
HART Communication
The process calibrator option supports HART communication.
This allows compatible smart temperature transmitters to be configured and evaluated directly from the calibration system.
For process calibration applications, the combination of:
- Temperature generation
- Thermocouple measurement
- Current measurement
- Voltage measurement
- Loop power
- HART communication
can reduce the number of separate instruments required at the calibration workstation.
Task Documentation
The ADT 875PC-1210 provides documenting functionality for structured calibration workflows.
Up to:
1,000 tasks
can be stored.
Each task can contain up to:
10 results
with as-found and as-left information.
The system also supports functions such as screen capture, automatic stepping and ramp recording.
These features help improve efficiency and documentation during repetitive calibration work.
Modern Communication and Touchscreen Operation
The Additel ADT 875-1210 uses a modern color touchscreen interface.
Communication capabilities include:
- USB
- Wi-Fi
- Bluetooth
These interfaces support integration into modern calibration environments and simplify remote operation, firmware management and data handling.
ISO 17025 Accredited Calibration Included
Each Additel ADT 875-1210 is tested and calibrated in Additel’s accredited laboratory.
The furnace is supplied with an:
ISO 17025-accredited calibration certificate with data.
According to Additel, the supplied calibration data includes information relating to:
- Accuracy
- Stability
- Uniformity
This provides valuable information about the individual furnace and supports professional metrological traceability.
Technical Highlights
| Feature | Additel ADT 875-1210 |
|---|---|
| Device type | Thermocouple calibration furnace |
| Performance class | Standard |
| Temperature range | 100 °C to 1210 °C |
| Display accuracy at 100 °C | ±1.2 °C |
| Display accuracy at 300 °C | ±1.2 °C |
| Display accuracy at 600 °C | ±1.2 °C |
| Display accuracy at 900 °C | ±1.6 °C |
| Display accuracy at 1210 °C | ±2.0 °C |
| Temperature stability | ±0.1 °C |
| Axial uniformity at 1210 °C | ±1.5 °C over 20 mm zone |
| Radial uniformity at 1210 °C | ±1.0 °C |
| Loading effect | ±0.5 °C |
| Temperature control | Advanced Adaptive Control / 3-zone |
| Inserts | Interchangeable metallic inserts |
| Display | Color touchscreen |
| Communication | USB, Wi-Fi, Bluetooth |
| UUT channels | 4 with PC option |
| Reference TC channel | PC option |
| Current measurement | ±30 mA with PC option |
| Voltage measurement | Up to ±30 V with PC option |
| Loop power | 24 V DC with PC option |
| HART | PC option |
| Documentation | Up to 1,000 tasks |
| Calibration | ISO 17025-accredited calibration with data |
Additel ADT 875-1210 vs. Additel ADT 878-1210
The Additel ADT 875-1210 and Additel ADT 878-1210 share the same basic temperature range:
100 °C to 1210 °C.
Both models provide:
- ±0.1 °C temperature stability
- Advanced Adaptive Control
- Multi-zone temperature regulation
- Interchangeable metallic inserts
- Optional process calibration electronics
- Modern touchscreen operation
- Wi-Fi and Bluetooth connectivity
- Accredited calibration with data
The main difference is the specified metrological performance.
The ADT 875-1210 is Additel’s Standard model.
The ADT 878-1210 is the Reference model.
At 1210 °C, the specified display accuracy is:
ADT 875-1210: ±2.0 °C
ADT 878-1210: ±1.5 °C.
Axial uniformity over the specified 20 mm zone at 1210 °C is:
ADT 875-1210: ±1.5 °C
ADT 878-1210: ±1.0 °C.
Radial uniformity at 1210 °C is:
ADT 875-1210: ±1.0 °C
ADT 878-1210: ±0.8 °C.
The ADT 875-1210 therefore provides the standard performance level for professional thermocouple calibration, while the ADT 878-1210 is intended for applications requiring improved accuracy and temperature uniformity.
Measurement Uncertainty in Thermocouple Calibration
When the Additel ADT 875-1210 is used as part of a professional thermocouple calibration system, the complete measurement uncertainty budget should be considered.
Depending on the calibration procedure, relevant contributions may include:
- Reference thermocouple calibration uncertainty
- Reference thermocouple drift
- Furnace temperature stability
- Axial temperature uniformity
- Radial temperature uniformity
- Loading effect
- Thermocouple inhomogeneity
- Immersion effects
- Cold-junction compensation
- Electrical voltage measurement
- Repeatability
- Environmental conditions
The detailed manufacturer specifications for stability and uniformity provide important input quantities for developing an appropriate uncertainty budget.
Typical Applications
The Additel ADT 875-1210 is suitable for:
- Thermocouple calibration
- High-temperature calibration
- Type K thermocouple calibration
- Type N thermocouple calibration
- Type S thermocouple calibration
- Type R thermocouple calibration
- Type B thermocouple calibration
- Temperature transmitter calibration
- Furnace sensor verification
- Heat-treatment sensor calibration
- Comparison temperature calibration
- Calibration laboratories
- Industrial quality assurance
- Process instrumentation
- Research and development
- Temperature metrology
Why Choose the Additel ADT 875-1210?
The Additel ADT 875-1210 combines a broad 100 °C to 1210 °C temperature range with excellent stability and professional thermocouple calibration capabilities.
Its Advanced Adaptive Control combines wind-tunnel technology with three-zone temperature control to optimize stability and temperature uniformity throughout the calibration region.
Temperature stability is specified at ±0.1 °C, while the display accuracy reaches ±2.0 °C at 1210 °C.
Interchangeable metallic inserts provide flexibility for different thermocouple diameters and calibration requirements.
For more comprehensive calibration tasks, the optional ADT 875PC-1210 process calibrator adds four device-under-test thermocouple channels, a dedicated reference thermocouple channel, electrical measurement, 24 V loop power, switch testing, documentation and HART communication.
The result is a flexible high-temperature calibration platform suitable for both dedicated thermocouple comparison calibration and more complex temperature transmitter calibration workflows.
At europascal, we provide Additel temperature calibration technology for professional laboratory and industrial applications. Our portfolio includes dry block calibrators, thermocouple calibration furnaces, calibration baths, reference thermometers and temperature measurement equipment.
For professional calibration and metrological traceability of temperature measuring instruments, visit the europascal Calibration Service.
Further Additel products are available from europascal.
Manufacturer information about the Additel ADT 875-1210 is available on the official Additel website.
