Triple Point Calibration of water – The single combination of pressure and temperature at which liquid water, solid ice, and water vapor can coexist in a stable equilibrium occurs at exactly 273.16 K (0.01 °C) 32.018º F and a partial vapor pressure of 611.73 pascals (ca. 6.1173 millibars, 0.0060373 atm). At that point, it is possible to change all of the substance to ice, water, or vapor by making arbitrarily small changes in pressure and temperature.
NASA WSTF
Our calibration service provides direct comparisons to Standard Platinum Resistance Thermometers (SPRT) calibrated to the ITS-90 standard across a range of temperatures. Once the desired temperature is reached, the SPRT and the test instrument temperature readings are compared to determine any deviation from the known standard. This process provides the lowest possible measurement uncertainties for our temperature sensing equipment. We also utilize controlled temperature and humidity chambers and routinely calibrate them using certified standards ensuring accurate measurements.
Temperature
- Scope: – 197 to 500 °C
- Instrument Types: Thermometers, Thermocouples, Temperature Indicators
Relative Humidity
- Scope: 1 to 98%
- Instrument Types: Humidity Meters, Dew-Point Meters, Humidity/Temperature Transmitters