Whether you're simulating thermocouples or calibrating thermocouples directly through comparison methods, Fluke offers the most comprehensive selection of quality thermocouple calibrators on the market, including thermocouple simulators, handheld multifunction calibrators, temperature sources such as dry-block calibrators and liquid baths, thermocouple reference Standards, and thermocouple readouts.
Thermocouple calibration product categories include:
- Handheld thermocouple calibrators and simulators
- Comparison calibration instruments
Explore our selection of calibration baths here.
Handheld Thermocouple Calibrators and Simulators
These handheld products are used for calibration of thermocouple indicators and thermocouple measurement devices such as temperature transmitters.
| Model | Range | Thermocouple Type | Description/Features |
| 754 Documenting Process Calibrator-HART | -250 to 2500 °C | E, N, J, K, T, B, R, S, C, L, U, BP, XK | Documenting calibrator with HART, TC and RTD temperature calibrator, with loop power, source/measure TC and measures mA |
| 7526A Precision Process Calibrator | –250 °C to 1767 °C | B, C, E, J, K, L, N, R, S, T, U, XK, BP | Offers the best balance of economy and accuracy for benchtop calibration of temperature and pressure process instrumentation |
| 726 Precision Multifunction Calibrator | -200 to 1800 °C | J, K, T, E, L, N, U, C, BP, XK, B, R, S | Multifunction calibrator (twice as accurate as 725) |
| 725 Multifunction Process Calibrator | -200 to 1800 °C | J, K, T, E, R, S, B, L, U, N | Multifunction calibrator, TC and RTD temperature calibrator, with loop power, source/measure TC and measures mA |
| 724 Temperature Calibrator | –200 to 1800 °C | J, K, T, E, R, S, B, L, U | TC and RTD temperature calibrator, with loop power, source/measure TC and measures mA |
| 714B Thermocouple Calibrator | -250 to 1410 °C | E, N, J, K, T, B, R, S, C, L, U, BP, XK, G, D, P, M | Thermocouple (TC) temperature calibrator, source/measure TC and measures mA |
Comparison Calibration Instruments
Calibration of a thermocouple by comparison methods requires:
- Reference thermometer
- Thermometer readout
- Stable and uniform temperature source
Fluke offers a wide range of products to fit your temperature range, accuracy, and budget requirements.
Reference Thermometers
| Model | Range | Accuracy | Description/Features |
| 5649/5650 Type R and Type S Thermocouple Standards | 0 °C to 1450 °C | greater of ±0.6°C or ±0.1% of reading | Eight models to fit any ype R or S thermocouple application |
| 5624 Platinum Resistance Thermometer to 1000 °C | 0 °C to 1000 °C | ± 0.006 °C at 0 °C ± 0.031 °C at 660 °C ± 0.041 °C at 961 °C | World’s finest high-temperature secondary PRT |
| 5628 High-Temperature Secondary Standard | –200 °C to 661 °C | ± 0.006 °C at –200 °C ± 0.006 °C at 0 °C ± 0.015 °C at 420 °C ± 0.022 °C at 661 °C | Fills the gap between affordable, but temperature-limited secondary PRTs and more expensive, highly accurate SPRTs |
| 5609 Secondary Reference PRT | –200 °C to 670 °C | ± 0.007 °C at –200 °C ± 0.008 °C at 0 °C ± 0.020 °C at 420 °C ± 0.027 °C at 660 °C | Very stable thermometer |
Thermometer Readouts
| Model | Range | Accuracy | Description |
| 1586A Super-DAQ Precision Temperature Scanner | -15 mV to 100 mV | 0.004 % + 4 µV | Most accurate and flexible temperature data acquisition system on the market |
| 1560 Black Stack Thermometer Readout | -10 to 100 mV | ± 0.002 mV | Accurate, expandable and configurable readout |
| 1529 Chub-E4 Standards Thermometer | -10 mV to 100 mV | ± 0.005 mV | Lab-quality accuracy on four channels |
| 1523/1524 Handheld Reference Thermometers | 0 Ω to 400 Ω ± (0.004 % + 0.002 Ω) 200 Ω to 50 kΩ± (0.01 % + 0.5 Ω) 50 kΩ to 500 kΩ± (0.03 %) | Measure, graph and record three sensor types with one tool | |
Thermocouple Calibration Furnaces
| Model | Range | Stability | Description/Features |
| 9118A Thermocouple Calibration Furnace | 300 °C to 1200 °C | ± 0.2 °C (without block), ± 0.1 °C (with block) | Horizontal thermocouple furnace. Flexible configuration for calibrating thermocouple bundles, spools, and sheathed thermocouples. |
| 9150 Portable Thermocouple Furnace | 150 °C to 1200 °C 302 °F to 2192 °F | ±0.5 °C | Benchtop thermocouple furnace. Interchangeable insert sleeves. Fast heating and cooling. |
Dry-Block Calibrators
| Model | Range | Accuracy | Description/Features |
| 9142 Field Metrology Well | –25 °C to 150 °C | ± 0.2 °C | Light-weight portable and fast Reads and documents °C, mV, W, and 4-20 mA 24 volt loop power Includes accredited certificate of calibration |
| 9143 Field Metrology Well | 33 °C to 350 °C | ± 0.2 °C | |
| 9144 Field Metrology Well | 50 °C to 660 °C | ± 0.35 °C at 50 °C ± 0.35 °C at 420 °C ± 0.5 °C at 660 °C | |
| 9190A Field Metrology Well | –95 °C to 140 °C | Accuracy: ± 0.2 °C | Horizontal thermocouple furnace. Flexible configuration for calibrating thermocouple bundles, spools, and sheathed thermocouples. |
Liquid Baths
| Model | Range | Stability | Depth | Description/Features |
| 6109A Portable Calibration Bath | 35 °C to 250 °C | 0.015 °C | 400 mm (15.7 in) | Four times more calibration throughput and twice the accuracy of Micro-Baths and dry-block calibrators |
| 7109A Portable Calibration Bath | –25 °C to 140 °C (–15 °C cover off) | 0.01 °C | 400 mm (15.7 in) | Four times more calibration throughput and twice the accuracy of Micro-Baths and dry-block calibrators |
| 6330 Compact Temperature Calibration Bath | 35 °C to 300 °C | ±0.005 °C at 100 °C ±0.015 °C at 300 °C | 234 mm (9.25 in) | Small benchtop footprint. Optional cart includes storage space. High temperature bath |
| 7320 Temperature Calibration Bath | –20 °C to 150 °C | ±0.005 °C at –20 °C ±0.005 °C at 25 °C | 234 mm (9.25 in) | Small 9.2-liter (2.4-gallon) tank. Uniformity ±0.005 °C. |
| 7340 Compact Temperature Calibration Bath | –40 °C to 150 °C | ±0.005 °C at –40 °C ±0.005 °C at 25 °C | 234 mm (9.25 in) | Low temperature calibrations. Metrology-level performance. |
| 7380 Compact Temperature Calibration Bath | –80 °C to 100 °C | ±0.006 °C at –80 °C ±0.010 °C at 0 °C | 178 mm (7 in) | Achieves –80 °C in less than 130 minutes. Quiet operation. |
| 6331 Deep-Well Compact Bath | 40 °C to 300 °C | ±0.007 °C at 100 °C ±0.015 °C at 300 °C | 457 mm (18 in ) | 18 in of depth with just 16 liters of fluid. RS-232 included. |
| 7321 Deep-Well Compact Bath | –20 °C to 150 °C | ±0.005 °C at –20 °C ±0.005 °C at 25 °C | 457 mm (18 in) | Perfect for LIG thermometers with optional kit. Quiet operation. |
| 7341 Deep-Well Compact Bath | –45 °C to 150 °C | ±0.005 °C at –40 °C ±0.005 °C at 25 °C | 457 mm (18 in) | Fast temperature changes. Access opening accommodates many thermometers. |
| 7381 Deep-Well Compact Bath | –80 °C to 110 °C | ±0.006 °C at –80 °C ±0.005 °C at 0 °C | 457 mm (18 in) | Stability of ±0.006 °C or better over full range. Compatible with MET/TEMP II software. Low temperature bath |
Calibration Bath Accessories
| Bath Accessories | Stands, rods, and clamps to suspend and support your probes and thermometers |
| Bath Fluids | Silicone oils, salt, and cold fluids in convenient, small quantities. |
What is thermocouple calibration?
Thermocouple calibration is the process of verifying and adjusting a thermocouple's accuracy to ensure it provides reliable temperature readings. This involves comparing the thermocouple's output to a known reference temperature, typically generated by a thermocouple calibrator or a highly accurate temperature source like a dry-block calibrator. Regular thermocouple calibration is essential in many industries to maintain quality, safety, and compliance with standards.
What does a thermocouple calibrator do?
A thermocouple calibrator is a device that verifies and adjusts the accuracy of thermocouples. Thermocouples are temperature sensors used in various industries, and their accuracy is critical for process control, quality assurance, and safety. A thermocouple calibrator simulates thermocouple signals or measures the output of a thermocouple and compares it to a known reference temperature. This allows technicians to identify errors in the thermocouple's readings and make necessary adjustments to ensure accurate temperature measurement.
How do you calibrate a thermocouple?
There are two primary methods for calibrating a thermocouple:
- Comparison Calibration: The thermocouple is placed in a controlled temperature environment alongside a reference thermocouple with a known accuracy. The readings of both thermocouples are compared, and adjustments are made to the thermocouple being calibrated to match the reference.
- Simulation Calibration: A thermocouple calibrator simulates the electrical signal that a thermocouple would produce at a specific temperature. The thermocouple's reading is then compared to the simulated signal, and adjustments are made as needed.
What equipment is used for temperature calibration?
Various equipment is used for temperature calibration, depending on the type of sensor being calibrated and the required accuracy. Common equipment includes:
- Thermocouple Calibrators: Simulate thermocouple signals or measure thermocouple output for comparison to a reference.
- Dry Block Calibrators: Provide a stable and uniform temperature source for calibrating thermocouples and other temperature sensors.
- Metrology Wells: Offer high-accuracy temperature control for critical calibration applications.
- Liquid Baths: Provide a uniform temperature environment for calibrating sensors in a fluid medium.
- Infrared Calibrators: These are used to calibrate infrared thermometers and thermal cameras.
Related Selection Guides
- Thermometer Probe Selection Guide
- Thermometer Readout Selection Guide
- Probe-to-Readout Adapter Guide
- Data Acquisition System Selection Guide
Get help
If you are interested in learning more about how to calib rate a thermocouple, see the Fluke Calibration Thermocouple Application Note Series or register for the Fluke Calibration Practical Temperature Calibration course.
Need help selecting a thermocouple calibrator? Speak with one of our thermocouple calibrator equipment experts.