Atest Gaz Alpa MOD LED8, User Manual

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5.3 ALARM
It appears when concentration detected by one of the heads has exceeded the threshold value of ALARM. It
is accompanied by continuous red light of the LED at the gas detector which has detected the
concentration. In this status:
an acoustic signal is generated – just like in the warning by means of a built-in horn,
The ALARM status does not allow to turn off the horn.
the system turns on the OC ALARM, to control the external siren. Pressing the CONFIRM / CLEAR
will disable the external siren for 30 minutes,
the relays switch on – ALARM and LATCHED ALARM. The sustained alarm relay can be cleared only
after the cessation of ALARM status in any of the channels.
Action to be taken when ALARM is signalled:
analyse the probability of any other reason than uncontrolled leakage – especially the probability
of leakage initiated by maintenance technicians or probability of sensor inactivation by, for
example, painters,
if all the above causes seem unlikely:
• remove unauthorized persons from the affected area,
• as far as possible, allow ventilation of the premises which are at risk – by opening windows,
doors (if the control module does not automatically switch on the ventilation),
• call maintenance services to check for leaks in the installation and remove any possible leaks.
5.4 FAILURE
Alongside with the process of gas concentration measurement, the device performs number of test
measurements designed to determine the technical condition of the system. The purpose of this step is to
detect and signal to the user all the flaws in its operation. When faulty operation on one of the sensors is
detected the device signals FAILURE. The occurrence of failure will result is enabling the internal signalling
acoustic device and turning off the FAILURE relay (NC – COM contact closed). Pressing CONFIRM / CLEAR
will disable the internal siren.
5.5 POWER indicator lamp
If the POWER indicator lamp is on, the Alpa MOD LED8 is operational.
The indicator lamp will be turned off:
if Alpa MOD LED8 is defective,
in case of decrease or loss of controller voltage or battery discharge.
5.6 Status memory
During standby, the normal status of the device is emitting light from only one indicator lamp OK in green.
In case in any of the channels there is any of the following: ALARM, WARNING or FAILURE it will be signalled
by an appropriate indicator lamp matching the channel. The display will light up LED flashing MEMORY,
indicating that the memory contains the history of past events. In view of the fact that the control unit may
be not monitored at all times, and unusual situations can occur which end by themselves and are temporary
it was envisaged for them to be remembered, so that maintenance and service staff can learn about them
at a later time. Displaying conditions described below is only possible if a failure, a warning or an alarm is
not indicated at the time:
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User Manual: POD-006-ENG R03