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Figure 5: Operation of visual alarm devices as a function of gas concentration
4.1.4.2 Activation of acoustic alarm devices
Appropriate configuration of relay outputs makes it possible to control operation of acoustic alarm devices
where the devices are activated if the third threshold for the monitored substance is exceeded and
deactivated after the concentration drops below the third threshold.
It is also possible to deactivate the acoustic alarm devices for a specific time – see illustration 6. The
deactivation time is 10 minutes.
Button
Acoustic alarm
output
Gas concentration
ALARM 3
Time
t
DEZ
Alarm is triggered
– the output is activated
Alarm disappears, the
output becomes inactive
Operator depressed the button
and the is deactivated in spite of
the active alarm
The deactivation time
expired and the output is
reactivated
Deactivation time
– adjustable parameter
+
Figure 6: Operation of the output for visual alarm devices as a function of gas concentration
4.1.4.3 Actuation of solenoid valves
Appropriate configuration of relay outputs makes it possible to control solenoid valves, where exceeding of
the third threshold for LPG/NG/H
2
concentration may trigger the control unit to generate three consecutive
pulses capable of shutting the valve off.
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User's Manual: POD-051-ENG R02
Button
Optical alarm
output
Gas concentration
Time
Alarm – the output
is tripped
Alarm disappears
although the output
still remains active
Operator depressed the
button and the output is
deactivated
The output cannot be deactivated –
the Alarm 1 keeps remaining active
(no response to button depressing)
ALARM 1
