Calibration and adjustment - HMS110 - HMW112 - TMI110 - HMS112 - HMD110 - HMW110 - HMD112

HMDW110 with TMI110 User Guide

Document code
M211726EN
Revision
E
Language
English
Product
HMS110
HMW112
TMI110
HMS112
HMD110
HMW110
HMD112
Document type
User guide
Calibration means comparing the instrument to a known reference, either against a second instrument or a known reference environment. Correcting the reading of the instrument so that it measures accurately is referred to as adjustment.

HMDW110 series transmitters are fully calibrated as shipped from the factory. You can use the service port to calibrate and adjust the humidity and temperature measurement of the transmitter as needed. If you think the transmitter is not measuring correctly, check the following before starting any calibration and adjustment procedure:

  • Always wait for measurement instruments to stabilize in the ambient temperature. Temperature differences are a major source of measurement error.
  • Check that there are no heat or moisture sources near the transmitter.
  • Check that the transmitter is not in direct sunlight or close to the discharge of the supply air ducts.
  • Check that there is no moisture on the probe. If the sensor has become wet, you must allow it to dry before you can measure.
Performing an accurate calibration and adjustment takes some time and preparation. Instead of doing it yourself, you can also have a Vaisala Service Center calibrate and adjust your transmitter.