Atmospheric Oil Mist Detection System
TM4 / AUGUST 2018
EMAIL [email protected] WEBSITE www.oilmist.com 4 East Barnet Road, London, England, EN4 8RW TEL +44 (0)20 7328 3121
Sheet-11
POSITIONING AND LOCATION OF ATMOSPHERIC
SENSORS
NUMBER OF SENSORS REQUIRED
It must be taken into consideration that the number of Sensors will depend on the
pressure being released into the atmosphere which is relative to the volume of the
space. It will also depend on the amount of air movement.
In a large engine room you may need 4 or 5 Sensors (for which you would use a QMI
MULTIPLEX Atmospheric Oil Mist Detection System), for a hydraulic pack room 1 to 3
Sensors are sufficient. In purifier and compressor rooms one is usually enough. For all
other spaces such as steering gear or bowthruster housing use 1 or 2 Sensors.
Remember, any spare channels can be used later.
NOTE: Sensors cannot be used in cargo pump rooms as they have not been certified
for hazardous zones.
LOCATION OF SENSORS
Please follow the guidelines outlined below to get the best results.
We recommend using a smoke test aerosol or a smoke generator to judge the way the
air flows over the machinery. Normally air will move toward ventilation extractors or
the turbo charger, therefore, the Sensor must be placed in the air stream facing the
airflow as close as possible to the machinery.
The Sensor comes with a fixing flange which is welded on the Articulated Joint.We
suggest the length of cable that runs to the Sensor is longer than required to enable
the Sensors to be moved at a later date if necessary.
To confirm that the Sensors are correctly positioned you should carry out the following
test; wait until the engines, ventilation and other machinery are fully operational, then
once again use your smoke test aerosol or smoke generator to prove the Sensors are
correctly positioned. The Sensor should be rotated until positioned mid airflow as
indicated by the movement of smoke.
NOTE: Always place the Sensor in a position so that it can be easily maintained as the
Sensors should be cleaned regularly.
