Calibration and adjustment - DMP5 - DMP6 - DMP7 - DMP8 - DMPX

DMP Series User Guide

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User guide

Calibration means comparing the measurement output of the device to a known reference, such as a known environment in a calibration chamber or the output of a reference instrument. Correcting the reading of the device so that it measures accurately is referred to as adjustment.

The probe is fully calibrated and adjusted as shipped from the factory. To maintain the accuracy of the measurement, calibrate and adjust the probe as needed. Typical calibration interval is one year, but depending on the application it may be necessary to check the accuracy more frequently.

When adjustment is necessary, have Vaisala calibrate and adjust the probe.

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

WARNING When returning a product for calibration or repair, make sure it has not been exposed to dangerous contamination, and is safe to handle without special precautions.

If you think the device is not measuring correctly, calibration and adjustment is not the first thing to do. Check the following first:

  • Make sure nothing is interfering with the measurement: heat sources, temperature differences, or condensation.
  • Check that there is no moisture on the probe. If the sensor has become wet, wait for it to dry.
  • Always wait for the measurement to stabilize.