Atmospheric Oil Mist Detection System
MULTIPLEX
AM8/JANUARY 2015
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, England, EN4 8RW TEL +44 (0)20 7328 3121
Running Procedure Part3-3
OPERATION OF ALARM RELAYS
The relays work in conjunction with the lights on the CMU display panel:
ALARM SEQUENCE
The minimum alarms used are the Main alarm and Fault alarm. The functional
shutdown (or slowdown) can be used to shutdown the plant.
If used, the functional first relay activates at 80% and is an early warning alarm.
The second main alarm and third (slow or shutdown) alarm are activated at 100%.
FAULT ALARM
See Part 3-10
A fault alarm relay is completely divorced from the other relay systems and is only
activated after a fault has developed in the Oil Mist Detection System. No relays will
activate for 2.5 seconds, as the Monitor will check first that the fault is in the system
and not a problem with the environment.
Even when this fault alarm relay is activated the instrument goes on monitoring
unless there is a major malfunction of the Monitor or Sensor. Information is also
being continuously given as a digital display of the highest concentration of oil mist
and its location.
The digital display will always indicate the channel (i.e. area) with the highest level
of oil mist. IN THE EVENT OF A FAULT ALARM IT WILL BE THE FIRST CHANNEL TO
GO INTO THE FLASHING GREEN, AMBER, RED CONDITION THAT IS INDICATED ON
THE DISPLAY (F1, F2, AND F3).
NOTE: THERE IS A ONE-MINUTE DELAY when the fault alarm sounds. After a self-
test or a channel check the display will always revert to the channel with the highest
oil mist level reading.
ALARM OPERATING RANGES
With Binary switch 5 set to OFF the range is from 0 up to 1.30mg/L.
With Binary switch 5 set to ON the range is from 0 up to 2.00mg/L.
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