P1.10 Errors in Relative Humidity Measurements Due to Slow Temperature Response
- SMSI 2020
(did not take place because of Covid-19 virus pandemic)
- SMSI 2020 - Sensors and Instrumentation
- P1 Chemical Sensors
- H. Sairanen - Vaisala Oyj, Vantaa (Finland)
- 213 - 214
Relative humidity calibrations are usually completed at static conditions i.e. both temperature and dew-point temperature is stabilized prior to reading values of the device under test and references. This kind of static calibration is justified by reduced uncertainty and more simple calibration stations. Following this, humidity transmitters are usually specified in stable and static conditions, which is prob-lematic in terms of real world non-static environments. In this work effect of humidity transmitters thermal response times are studied and two different probe types are compared. Due to change of temperature a humidity transmitter which is specified to have accuracy of 1%rh might cause meas-urement error of about 5 %rh depending on stabilization time, level of temperature change and other environmental conditions.