Atmospheric Oil Mist Detection System
MULTIPLEX
AM8/JANUARY 2015
EMAIL [email protected] WEBSITE www.oilmist.com 4 East Barnet Road, London, England, EN4 8RW TEL +44 (0)20 7328 3121
Running Procedure
Part3-9
RESPONSE TO ALARM
There are two stages of oil mist alarm indication:
1. ANTICIPATORY/EARLY WARNING
At 80% the light will assume the ‘flashing’ mode.
The channel number will be indicated and the digital reading will indicate the percentage
density of the pre-set mist alarm level. The early warning alarm relay will operate.
NOTE:
This alarm is automatically operated when the oil mist density level reaches
80% of the pre-set alarm level.
2. FULL ALARM
At 100% of alarm level the red indicator will flash indicating that the oil mist level is
above the pre-set alarm level. The offending channel will be displayed alongside the
digital read-out level. The functional shutdown relay alarm RL9 will operate if wired
into the system. At this level RL10, the main alarm, will be activated. Further action
should be taken in accordance with the standard procedures.
Over-riding the QMI MULTIPLEX system during procedures that may introduce particles
into the atmosphere (e.g. painting) is at the operator’s discretion. If such a function is
required it should be incorporated in the ship’s overall system.
IMPORTANT:
When any alarm sounds all personnel should leave the area.
IMPORTANT NOTICE:
With Atmospheric Oil Mist Detection Systems, the alarm point should be set quite
low, so that the Main Alarm activates as soon as there is any Oil Mist sensed in the
Atmosphere.
The Oil Mist level will increase so quickly that the Early Warning and Main Alarm will
activate almost simultaneously.
The Early Warning Alarm would normally be used in Engine Crank Case Oil Mist
Detection systems where the Oil Mist increase, usually, more slowly.
