Product Description (Details)
GM32 · Technical information · 8011923 · V1.4 · © SICK AG 19
Subject to change without notice
GPP – gas diffusion probe in dry or wet version
This version is more suitable for higher dust contents because, on GPP probes, dust parti-
cles are separated on the filter element and therefore kept away from the measuring path.
To allow an EPA-conform audit measurement as well as with low flow speeds or irregular
flow profiles, the GPP (Gas Permeable Probe) should also be chosen.
Fig. 5 Measuring gap of the GPP measuring probe
Both variants of the GPP differ in the respective filter which provides suitability for different
application areas.
They are fitted with an automatically controlled heater to reliably prevent condensate on
the optical interfaces.
The heating control is located between the assembly and device flange in a housing
connected firmly with the probe. The electronics for heating control and temperature and
pressure measurement are protected safely in a stable cast housing that forms the section
of the measuring probe between the duct flange and SR-unit. Both the electrical connec-
tions for CAN bus and power supply as well as the test gas connection and pressure
measurement connection are fitted on this housing and serve manual activation of the
audit measurement according to EPA Guideline CFR 40, Part 60 or Part 75.
Temperature sensor PT 1000
Ceramic filter or teflon/ceramic
filter, gas permeable
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