GM35 Operating Instructions
Probe Model
Product overview
14 © SICK MAIHAK GmbH • Germany · All rights reserved 8009389/07-2006
The two versions of the GPP differ with regard to the filter, which is suitable for different
applications, as shown in page 14.
Advantages of the
GPP probes
The GPP probes do not require a purge-air supply, are easy to maintain, and are equipped
with a controlled heater for the optical boundary surfaces to prevent condensate formation.
The electronic components for the heater regulator, and temperature and pressure
measurements are safely stored in a stable cast-metal housing in the Chapter of the
measuring probe between the duct flange and the SR unit.
In this picture, this housing contains the electrical connections for the power supply and the
CAN bus, as well as the test gas connection for performing audit measurements according
to EPA Specification CFR 40, Part 60 or Part 75.
Overview of the GM35 measuring probes
The table below contains an overview of the features of the different measuring probes. All
of the measuring probe versions are compatible with each SR unit type, as shown in table
below. The SR unit is calibrated for use with the respective probe length on delivery.
Measuring probe GMP (open probe) GPP (dry)
Design Measuring distance open in
flow direction; purge-air
guidance with outlet aligned
along the gas flow
Gas diffusion probe with
ceramic filter, for dry
measurement gas
Max. measurement gas
temperature
430 °C
*)
*)
The maximal Temperature used for the measurement is application dependent.
430 °C
Test gas cycle according to
EPA specifications possible
–yes
Purge-air supply required yes –
Heating the optical boundary
surfaces in the probe
– yes, with integrated control-
ler
Measurement gas velocity 1...40 m/s < 40 m/s
Suitable for wet
measurement gas
yes –
Max. duct overpressure ±120 hPa, depending on
blower in purge-air unit
±120 hPa
Measurable gas
components
**)
**)
O
2
measurement requires N
2
for purging
NH
3
, HF
,
O
2
System response time (T
90
) ≥ 5 s ≥ 120 s
Duct diameter
***)
***)
Probes with smaller active measuring distance are available on request (may be required for higher concen-
trations or smaller duct diameters)
> 360 mm > 300 mm
Dust concentration < 2 g/m
3
actual < 30 g/m
3
actual
Available probe lengths [m] 1.0/1.5/2.0/2.5 1.0/1.5/2.0
Available active measuring
distances [mm]**
250/500/750/1000/1250 250/500/750/1000/1250
GM35 measuring probes (for dimensioned drawings, see Chapter 13 „Technical Data, Consumables,
and Spare Parts“)
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