|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.
Vaisala recommends sending the transmitter regularly to Vaisala for factory calibration. The transmitter is calibrated and adjusted at multiple points along its measurement range. Factory calibration always includes a traceable calibration certificate and adjustment, if needed.
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.
|Factory calibration leads to highest accuracy and lowest uncertainty. After factory calibration the instrument performs as new. For up-to-date information about calibration points and offering, visit store.vaisala.com.|