Auto-calibration - DMT152

DMT152 User Guide

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User guide

The auto-calibration feature of the DMT152 transmitter is an automatic procedure that greatly reduces the possible drift in the dry end of the dew point measurement.

Auto-calibration is performed:
  • at 45-minute intervals
  • at shorter intervals if Td is near the dry end of the measurement range
  • when the transmitter is powered up
  • when the measured environment changes rapidly.
During auto-calibration the sensor is warmed for a short period (< 1 min) and the sensor capacitance values are evaluated at the elevated temperature. The possible dry end drift is then corrected to correspond to the calibrated values. Measurement and output remain active during auto-calibration.

Auto-calibration is carried out only if several criteria for the measurement environment are fulfilled. This ensures the reliability of the adjustments, and maintains the excellent long-term stability.