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Thermal Metrology


Fixed point cells are the most accurate devices available for defining a temperature scale. Fixed point cells are designed to realize the liquid-solid equilibrium temperatures of certain high purity metal elements, for calibration of thermometers at ITS-90 fixed points. 

Typically, only national metrological institutes provide such kind of calibration facilities, however FARE Labs also has the primary fixed point calibration facility. 

We Calibrate SPRTs and other Precision Resistance Thermometers by fixed point cells at the following points:

  • Liquid Nitrogen (-196.075 °C)
  • Triple Point of Water (0.01°C)
  • Freezing Point of Gallium (29.7646°C)
  • Freezing Point of Tin (231.928°C)
  • Freezing Point of Zinc (419.527°C)
  • Freezing Point of Aluminium(660.323°C)


Thermocouple thermometry is performed in the high temperature section using noble and base metal thermocouples in the range of 0°C to 1600°C. Sources such as Horizontal Temperature furnace and High temperature standard furnace are used for the calibration. R-type, S-type & N-type thermocouples are used as standards for the comparison.

Humidity meters, RHT sensors, Digital Hygrometers & Data loggers are calibrated in this section in the range of 10% to 95% RH & 10°C to 50°C. Humidity generators from FLUKE and humidity chambers are used as sources for the calibration in this section. Digital Thermo Hygrometer with indicator is used as the standard.

IR – Thermometers, Thermal Imagers & optical pyrometers in the range of -15°C to 3000°C are calibrated in this section. FARE Labs is one of the very few labs in India to be able to perform non-contact calibration over such a huge range of temperatures, including below 0°C non-contact calibration.

Sources such as High precision IR calibrator, spherical black body source and High temperature radiation pyrometer are used in this section. Pyrometers, IR guns, IR pyrometers & Thermal imagers are used as standards for the calibration in the pyrometry section.


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