Vaisala GMP231 - Manual (Page 23)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 21
Avoiding Condensation
The sensor head of the GMP231 is heated during normal operation,
which prevents condensation from forming inside the filter and on the
optical surfaces. The heating is not on when GMP231 is in standby mode
or unpowered. For this reason, keep the probe powered and operating
when the incubator is in use and humidity inside the chamber is high.
Correct installation depth of the probe is also important for preventing
condensation from running to the sensor along the chamber wall.
See below.
Probe Installation Depth
GMP231 must be installed so that only the sensor element and the filter
are inside the chamber. If the probe is longer the installation tube, the
extra length should extend to the outside of the chamber.
The installation depth must be 2.5 mm. This installation depth provides
the specified heat durability of the probe, and allows the silicone plug to
seal the Ø44 mm installation tube properly.
1403-154
Figure 5 Probe Installation Depth
2.5 mm