100
8009441/YN36/V3-0/2015-08| SICKOPERATING INSTRUCTIONS|GM35
Subject to change without notice
MAINTENANCE
▸ Switch the filter box on; the warming up phase takes about 2.5 hours.
▸ Switch on the zero gas pump or connect a different zero gas.
▸ Switch all chamber valves to “Zero gas” and switch the Measuring/Purging valve to
“Purging”.
On the EvU:
▸ After about 3 minutes, select menu Box measuring in menu cal (cal button), then option
“gas”.
▸ Enter password “1 2 3 4”.
The measuring device carries out a zero adjust and then switches to operating mode
“Box measuring”.
Fig. 72: Control elements on the filter box
▸ Connect test gas; set the primary pressure to approx. 1000 hPa (1 bar).
▸ Note the diameters of the individual chambers/chamber combinations in the filter box
and the concentration values;
see “Determining the necessary test gas concentration”,
page 98
.
▸ When doing so, set the valves for the relevant filter chambers to “Test gas”.
▸ Switch the Measuring/Purging valve to “Purging” for 2 to 3 minutes (until the
measured value has stabilized) and then to “Measuring”.
The overpressure from the purge phase now dissipates.
▸ When the measured value has stabilized again, read off and note the value.
8.6.3 Restart Measuring mode
▸ Purge the filter box with zero gas
On the EvU:
▸ Exit operating mode “Box measuring” by pressing back.
▸ Disassemble the filter box with plate and reflector from the SR-unit and store safely
▸ Refit the SR-unit back onto the measuring point in the correct position.
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