IMPROVING CALIBRATION AND MEASUREMENT CAPABILITY (CMC) OF PSYCHROMETER CALIBRATION

Arfan Sindhu Tistomo (Research Center for Metrology LIPI)
Purwowibowo - (Research Center for Metrology LIPI)
Rcahman Soleh (Research Center for Metrology LIPI)
Melati Azizka Fajria (Research Center for Metrology LIPI)
Ocka Hedrony (Research Center for Metrology LIPI)

Jurnal Instrumentasi
Vol 42, No 1 (2018)

The improvement of Calibration Measurement Capability (CMC) for Psychrometer calibration has been done through calibrating a homemade psychrometer with two platinum resistance sensors as its  dry and wet bulb thermometers. The calibration range covers 15 %rh to 90 %rh in a temperature range from  25 °C to 65 °C. The uncertainty budget is evaluated from the individual quantity uncertainty following Ferrel equation. As results, not only the existing CMC is greatly improved from 5 %rh to 1.8 %rh but also the calibration uncertainty at each set point is in accordance to the review criteria uncertainty values for submitting relative humidity CMCs to the Appendix C of Bureau International des Poids et Mesures (BIPM).