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Din side Meny

Dew-point

Instruments being calibrated

  • Dew point hygrometer with PC connection and software or display
  • Dew point transmitter, measurement output: current 4–20 mA or voltage 0–10 V

Measurement range and traceability

  • –80 °C fp/dp to 20 °C dp using a primary dew point generator with an SPRT that is traceably calibrated to the Norwegian Metrology Service’s realization of ITS‑90
  • 1 °C dp to 65 °C dp using a dew point generator and comparison against a dew‑point mirror that is traceably calibrated with the Norwegian Metrology Service’s primary dew point generator, or alternatively traceable to another National Metrology Institute

Measurement uncertainty

Calibrations from Justervesenet are consistent with the Calibration and Measurement Capabilities (CMCs) that are included in Appendix C of the MRA drawn up by the CIPM. Under the MRA, all participating institutes recognize the validity of each other’s calibration and measurement certificates for the quantities, ranges and measurement uncertainties specified in Appendix C. The “CIPM MRA Logo” and this statement attest only to the measurement component of the certificate.”

  • In the range 50 °C to 0 °C, the measurement uncertainty is U = 0.3 °C
  • In the range 0 °C to 20 °C, the measurement uncertainty is U = 0.2 °C
  • Other dew-point measurements are not part of this agreement

Method

Purified air is used as the medium. Instruments for calibration either have a tube connection or are placed inside a measurement chamber.

  • For –80 °C fp/dp to 20 °C dp using a primary dew point generator, the traceable airflow is directed to the instrument being calibrated
  • For 1 °C dp to 65 °C dp using a dew point generator, the generated airflow is directed to the instrument being calibrated and compared against a traceable dew‑point mirror. If needed, the instrument can be placed in a temperature‑controlled climatic chamber

This is a poster about the dew point generator. 

Contact information

Peter Rothmund

pro@justervesenet.no

Ofte stilte spørsmål om kalibrering

 

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