MULTIPLEX
Atmospheric Oil Mist Detection System
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
Installation Part2-28
QMI MULTIPLEX 4-20MA DATA LOGGER OUTPUT
It is useful to be able to record the level of oil mist present in the crankspace or
gearbox.
The data collected can be used to determine the cause of a build-up towards a possible
explosion and help find a solution. It will also record a rise in oil mist generated by
temperature caused by fitting new parts. Finally it can record events such as inclusions
caused by piston blow-by.
The Monitor sends out a 4-20mA signal corresponding to the displayed mist percentage
for each Sensor. This is a digitally calculated reading taking into account temperature
non-linearities of the Sensors and oil deposit build-ups within the Sensor.
The signal can be recorded using a chart recorder, or data logger and corresponds to
the reading shown in the display.
Current = (Display % x 16 ÷156) + 4
Display 0 10 20 30 40 50 60 70 80 90
mA 4 5.0 6.0 7.1 8.1 9.1 10.2 11.2 12.2 13.2
Display 100 110 120 130 140 150 160
mA 14.3 15.30 16.30 17.30 18.40 19.40 20.41
Display 170 180
mA 21.40 22.50
The 4-20mA output from the Monitor is available on the 16-way connector No.5 in
the centre of the box. See drawing QMI-05-1103 Part 2-29.
The FS3 400mA Fuse has been built in to protect the Data Logger PCB. It has a LED3
Green light which is constantly lit (not flashing) showing there is no fault with the
Data Logger.
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