Quality Monitoring Instruments QMI MULTIPLEX Manual page 42

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 Detector Head. This is a digitally calculated reading taking into account temperature non-
linearities of the Detectors and oil deposit build-ups within the Detector.
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
mA 4 5.0
Display 100 110
mA 14.3 15.30
Display 170 180
mA 21.40 22.50
The 4-20 mA 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 2-18.
Installation Part2-28
EMAIL qmi@oilmist.com WEBSITE www.oilmist.com 4 East Barnet Road, London, EN4 8RW, UK. TEL +44 (0)20 7328 3121
Engine Oil Mist Detection System
MULTIPLEX
20 30 40
6.0 7.1 8.1
120 130 140
16.30 17.30 18.40
50 60 70
9.1 10.2 11.2
150 160
19.40 20.41
80 90
12.2 13.2
EM6/March 2015