Operating Instructions GM35
Probe Model
Maintenance
8009389/07-2006 © SICK MAIHAK GmbH • Germany · All rights reserved 77
‡ Switch on the filter box. The warm-up phase lasts approx. 2.5 hours.
‡ Switch on the clean gas pump or connect a different clean gas.
‡ Switch all the chamber valves to "Clean gas" and switch the Measuring/Purging valve
to "Purging".
On the evaluation unit: ‡ After approx. 3 minutes, choose cal (cal key) and call up the Box measuring option. Se-
lect "Gas".
‡ Enter the password "1 2 3 4".
The measuring device carries out zero adjustment and then switches to "Box
measuring" mode.
Fig. 41 Controls on the filter box
‡ Connect the test gas. Set the pre-pressure to approx. 1000 hPa (14.5 psi).
‡ Note the diameters of the individual chambers/chamber combinations in the filter box
and the concentration values (see chapter 8.6.1, page 75).
‡ When doing so, set the valves for the relevant filter chambers to "test gas".
‡ Switch the Measuring/Purging valve to "Purging" for two to three minutes (until the
measured value has stabilized) and then switch it to "Measuring".
The overpressure generated during the purge phase decreases.
‡ Once the measured value is stable again, read the value and note it down.
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