Sensor purge feature is only available in the DMP74B/DMP74C probe. The purge should be carried out to achieve the shortest response times and the best long-term stability.
Sensor purge is an automatic procedure, in which the sensor is dried. Thus, the sensor will response very fast when installing the probe from an ambient to a dry gas. This will also ensure together with autocalibration the best measurement accuracy and long-term stability.
The purge is performed automatically if humidity changes significantly or quickly and if the dew point is low enough.
As a default, the automatic sensor purge is turned on automatically in DM70. It is recommended not to turn it off. The automatic sensor purge can also be started manually, which is necessary if the purge has not been performed during the last 24 hours. If the power is continuously turned on in DM70, or if DM70 has been left in logging mode (display on or off), the automatic sensor purge will be performed at set interval (default = 24 hours).