Calibration and adjustment overview - HMT120

HMT120 User Guide

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User guide

You can calibrate and adjust the transmitter using the following tools:

  • Push buttons on the transmitter component board
  • Serial line commands
  • Portable humidity meter HM70

A calibrator kit is needed for calibration against saturated salt solutions. The HMK15 Humidity Calibrator and pre-measured certified salts are available from Vaisala. For further information, please contact your Vaisala representative.

Vaisala Service Centers also offer accredited calibrations for humidity and temperature.

You can also remove the HMP110 series probe and replace it with a new one. The old probe can be adjusted using another transmitter body, if you have one available.

RH field calibration and adjustment, as instructed in this document, is restricted to a certain adjustment range to minimize the effects of special circumstances, such as chemical contamination. In case the probe is outside its adjustment/trim range due to, for example, chemical exposure, the calibration cannot be completed. In this case, it is recommended that you change the probe or contact Vaisala technical support.