HMP155 offers 3 heating options. The following table describes the options, their benefits, and typical applications.
Feature | Warmed probe | Chemical purge | Extra heat (Xheat) |
---|---|---|---|
Type | Continuous probe heating | Periodical heating of humidity sensor | Triggered heating on humidity sensor |
Description | Keeps the relative humidity of the humidity sensor below 80 %RH in all circumstances by heating the probe. | Cleans the humidity sensor regularly, for example by heating to 180 °C for 8 min every 0.5 … 10 days (user configurable). | Heats the humidity sensor chip to 100 °C (212 °F) for 30 s, if the sensor humidity is > 95 %RH (user configurable). |
Benefits | Accurate measurement in high humidity climate by avoiding condensation on the probe. | Reduced drift by removing chemical vapors from the sensor polymer. | Rapidly drying water vapor or droplets in humidity sensor. |
Where used | High humidity climates, such as tropical, coastal, and marine installations | Installation location exposed to chemical pollution, such as roads and chemical plants | Industrial applications where there is a risk that the humidity sensor becomes too wet (for example, installation without a radiation shield). |
Notes | Requires an additional temperature probe for relative humidity measurement. | Data is locked during heating and cooling. Not for use in freezing temperatures. For use before relative humidity calibration and adjustment. |
Data is locked during heating and cooling. |
Warmed probe, chemical purge and extra heat are optional features available for probes with composite sensors (HUMICAPR2C, HUMICAP180RC, and INTERCAPC). |