2.6 Probe Filter
The white filter on the probe covers the PEROXCAP sensor. The filter is made of porous PTFE
that allows ambient air to reach the PEROXCAP sensor while protecting the sensor in strong or
turbulent air flow.
The filter is an essential part of the measurement. If the filter is
broken, dirty, or removed altogether, measurement does not work as intended.
• Do not touch the
filter with bare hands. If you need to touch the filter, always
use clean gloves (rubber, cotton or similar material).
• Keep the
filter free of any grease or oil.
• Do not touch any parts under the filter. Touching parts under the filter may
damage the sensors.
CAUTION!
More Information
‣
Problems and Their Possible Solutions (page 36)
2.7
Chemical Purge
Chemical 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 H
2
O
2
environments. During the purge, only temperature measurement is
available.
The purge is automatically performed:
• At probe start-up.
• At intervals (default 24 hours,
configurable between 1 hour ... 1 week using Vaisala Insight
software, Modbus, or Indigo 200 transmitters). Purge is postponed by 30 minutes if H
2
O
2
is present or RH is not steady.
Purge is recommended at least every 24 hours of powered-on time, even if the probe has not
been continuously exposed to H
2
O
2
.
Optional: if needed, you can also trigger a purge manually with Modbus (in digital mode) or
pin #5 on the M12 connector (in analog mode).
More Information
‣
Triggering Purge in Analog Mode (page 27)
‣
Operation in Analog Mode (page 26)
Chapter 2 – Product Overview
11
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