Sensor purge - HPP271

HPP271 User Guide

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Sensor purge is a 4-minute process where the sensors are heated to remove possible contamination. The purge is essential for the long-term performance and accuracy of the probe in demanding H2O2 environments. During the purge, H2O2 and H2O measurements are not available.

The purge is automatically performed:
  • At probe start-up.
  • After an RH for H2O2 adjustment is made.
  • At intervals (default 24 hours, configurable between 1 hour ... 1 week using Vaisala Insight software, Modbus, or Indigo transmitters). Purge is postponed by 30 minutes if H2O2 is present or ambient humidity is not steady.
If required, you can also enable purge during H2O2 exposure with the Insight PC software or an Indigo transmitter.

Purge is recommended at least every 24 hours of powered-on time, even if the probe has not been continuously exposed to H2O2.

Optional: if needed, you can also trigger a purge at any time with Vaisala Insight software, Modbus (in digital mode) or pin #5 on the M12 connector (in analog mode).