3-31
OPERATION
3.21 Switch the instrument OFF
Before switching OFF from the normal operating mode, make
sure that the instrument is in fresh air in order to purge any
remaining gas from the instrument.
To initiate the shutdown sequence:
• Press and hold the Top Button .
The OFF sequence countdown begins and the user
must keep the buttons depressed for a further three
(3) seconds to switch the instrument OFF.
The countdown sequence is illustrated in Fig. 3-41.
Fig. 3-41 Countdown Sequence to OFF
Note 1: The OFF sequence can be aborted by
releasing the Top Button, providing access
to the previous operating display.
Note 2: The countdown sequence will commence at
‘9’ if an alarm is active when the shutdown
sequence is initiated.
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