Detector Mounting And Location - Quality Monitoring Instruments QMI MULTIPLEX Manual

Engine Oil Mist Detection System
MULTIPLEX

DETECTOR MOUNTING AND LOCATION

LOCATION OF QMI MULTIPLEX OIL MIST DETECTOR HEADS IN THE
CRANKCASE
The Detector should always be mounted on the down side of the crank rotation. If the Detector
is mounted on the up side of the crank rotation, it may cause contamination of the Head and
require more frequent cleaning.
TRUNK PISTON ENGINES
The end of the sampling pipe within the crankspace should be between the piston bearing and
the main bearing. This is the area where oil mist is most likely to be trapped. In engines that
rotate in one direction only, it is possible to place the extraction point close to the side next to
the crankspace compartment wall.
CROSSHEAD ENGINES
The normal place for the sampling pipe is in the upper area of the crankspace. This is the area
where the oil mist usually accumulates.
RETROFITS
When a QMI MULTIPLEX Oil Mist Detection System replaces another system, the same entry
points into the crankspace may be used. In this instance use an elbow after entering the
crankspace and attach a baffle to the sampling end of this elbow.
The pipe on the outside of the engine must be extended to raise the Detector to a height of
150mm to 200mm above the outlet if possible – see Part 2-8.
Installation Part2-4 EM6/March 2015
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, EN4 8RW, UK. TEL +44 (0)20 7328 3121