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Figure 7: Operation principle for visual indicator output with sustained
The operation principle for an acoustic indicator output is presented in Figure 8. The output is activated
when alarm threshold exceeding is detected at any detector. This output has to be temporarily disabled
when alarm is on, by pressing the push button (see also section 5.5). The output status can be observed
via the user’s interface (see section 5.5). For output specifications – see section 10.
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User's Manual: POD-026-ENG R17
Pushbutton
SO output
Gas concentration
Time
Warning -
output disable
Warning disappears -
despite this the
output is still enabled
Operator presses the
pushbutton – output
disables
The output cannot be turned
off – warning 1 is active (the
pushbutton does not
respond)
Warning 1 threshold
Figure 8: Impulse valve control and the operation principle for an acoustic indicator output
Pushbutton
SA Output
Gas concentration
ALARM
Time
t
DEZ
ALARM - output
enable
ALARM disappears -
output disabled
Operator presses the
pushbutton – output
disables despite active
warning
The time to disable
passes. Input enabled
again
Parameter,
deactivation time
Valve operation
