Heating options - HMP155

HMP155 User Guide

Document code
M210912EN
Revision
G.1
Language
English
Product
HMP155
Document type
User guide

HMP155 offers 3 heating options. The following table describes the options, their benefits, and typical applications.

Table 1. Heating options
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).