The sensor warming feature of the condensation prevention function is intended for improving the condensation tolerance of the probe. It warms the humidity sensor when necessary to keep the sensor's temperature above the dew point of the measurement environment. When sensor warming is activated, all temperature-dependent output parameters become unavailable, unless the temperature compensation setting is set to read the temperature from an external source. The output parameters become available again 4 minutes after the warming is stopped.
The humidity limit where sensor warming activates is:
- 80 %RH for DMP probes with S sensors
- 70 %RH for DMP probes with M sensors
In addition, the DRYCAP® sensor is kept continuously warmed in freezing conditions to ensure fast response time. Therefore, the temperature and dependent parameters are continuously unavailable if process temperature is below 0 °C / 32 °F.