Layout Of Pipework - Quality Monitoring Instruments QMI MULTIPLEX Manual

Engine Oil Mist Detection System
MULTIPLEX

LAYOUT OF PIPEWORK

PIPEWORK LAYOUT
See drawing QMI-05-1098 Part 2-6
The pipework for the MULTIPLEX system should be laid in such a way that there are no low
points for condensed oil mist to collect. Failure to lay the pipes properly may cause a blockage
thus affecting the efficiency of the system.
The Fan and Detectors should be supported by the pipework and not fixed by brackets to the
engine, see QMI-05-1098 Part 2-6 and QMI-05-1099 Part 2-8.
A ball valve is normally placed in the sample extraction pipe to adjust the air flow – see Part
2-6 and 2-7.
When fitting the Detector try to ensure that there is a vertical distance of 150mm to 200mm,
if possible between the sample exit point on the engine and the ¾" BSP entry into the Detector
Head – see QMI-05-1099 Part 2-8.
The Baffle supplied will reduce heavy oil contamination of the Detector Head and give longer
periods between cleaning.
FAN SUCTION ADJUSTMENT
The valve fitted in the suction manifold, just in front of the intake of the fan, is used to control
the airflow. This is to minimise the amount of oil and oil mist passing through the Detector so
as to obtain the best results.
With the valve fully open and the engine working under full load, note each channel number
with its associated oil mist reading. Slowly close the valve until the reading drops by about five
points.
Re-open the valve slowly until the original readings return. Secure the valve in this position as
this is the setting required to achieve the best readings and reduce Detector maintenance.
The Detector Heads must at all times be fitted vertically to prevent oil mist condensate from
blocking the internal labyrinth (see drawing QMI-05-1099 Part 2-8).
EM6/March 2015 Installation Part2-5
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, EN4 8RW, UK. TEL +44 (0)20 7328 3121