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The Thermocouple Calibration Laboratory calibrates thermocouples of the following type:
Calibration services for all commonly used types of thermocouples are provided by NIST from -196 °C to +2100 °C. The temperature range for a particular calibration depends on the type of wire or thermocouple submitted.
Thermocouples are calibrated by either comparison or fixed point, depending on the type of thermocouple, the temperature range, and the accuracy required. Both methods provide traceability to the International Temperature Scale of 1990 (ITS-90). Comparison calibration of thermocouple wire uses a reference thermocouple maintained at NIST. Fixed-point calibration of thermocouples use four defining temperatures of the ITS-90: the freezing points of zinc, aluminum, silver, and gold.
Single-leg thermoelements are tested against the NIST maintained platinum thermoelectric reference standard, Pt-67, by the first or second method.
Only bare wires are needed for NIST thermocouple calibrations. We would prefer customers not to send ceramic insulating and protecting tubes since they may get broken during shipment. If the thermocouple is shipped in a mount such as a protection tube assembly, a special dismantling fee may be charged and the parts will be returned unassembled.
The minimum length for thermocouple wire submitted for calibration should be at least:
For base-metal thermocouples (types E, J, K, N, and T) and thermocouple materials, only those that are unused will be accepted for test. A calibration will be undertaken only if the thermocouple is likely to yield the specified accuracy.
For contact information, shipping address, or cost of calibration, see Thermocouples, Thermocouple materials, Thermometer indicators.
Calibration Measurement Uncertainties
Type S calibrated using fixed-point
Type S propagated uncertainties from a fixed-point cell calibration
Type B, R, S comparison calibration to a Type S reference thermocouple
Base-metal thermocouple comparison calibration to a Type S reference thermocouple
Base-metal thermocouple (Type K or N) comparison calibration to a SPRT
100 Bureau Drive, M/S 8363