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How to perform a thermocouple fixed-point calibration service
Thermocouple calibration laboratory calibrates the following types of thermocouples:
Specified letters (E, J, K, N, T)
Specify non-letter (W / Re, Ir / Rh, Pt / Rh) precious metals (S, R, B)
Pure metal (Au / Pt, Pt / Pd)
Calibration services for all common 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 can be calibrated by comparison or fixed point, depending on the type of thermocouple, temperature range, and required accuracy. Both methods date back to the 1990 International Temperature Scale (ITS-90). Comparative calibration of thermocouple wires uses a reference thermocouple maintained at NIST. Fixed-point calibration of thermocouples uses four defined temperatures of ITS-90: the freezing points of zinc, aluminum, silver, and gold.
By the first or second method, a single leg thermocouple was tested against the platinum thermoelectric reference standard P t-67 maintained by NIST.
NIST thermocouple calibration requires only bare wires. We hope that customers do not send ceramic insulation and protection tubes as they may be damaged during transportation. If the thermocouple is transported in a mount such as a protective tube assembly, special disassembly costs may apply and parts will be returned without assembly.
The minimum length of the thermocouple wire submitted for calibration should be at least: compare calibration
Type, Type J, Type, Type, Type, Type S, Type 70 and Type B are 80 cm
w / Re 100 cm fixed point calibration-100 cm
For base metal thermocouples (E, J, k, N and type) and thermocouple materials, only unused thermocouples can be tested. Calibration is performed only when the thermocouple may reach the specified accuracy. How to schedule a calibration: