Vaisala DMT152 - Manual (Page 16)

User's Guide _______________________________________________________________________
14 ___________________________________________________________________ M210865EN-F
Sensor Purge
Sensor purge is also an automatic procedure that minimizes the drift at
the wet end readings of the dewpoint measurement. Sensor purge is
performed once a week or when the power is switched on. The sensor is
heated for several minutes, which will then evaporate all excess
molecules out of the sensor polymer. This, together with the auto-
calibration, results in a very small drift. The measurement output of the
transmitter is frozen to the last measured value for the duration of the
sensor purge.