Central Monitor Unit; Description Of (Q02L) Engine Detector; Part - Quality Monitoring Instruments QMI MULTIPLEX Manual

CENTRAL MONITOR UNIT

The CMU contains:
1. Display panel with MP12 PCB v 3.2
2. Power Supply Board (PSB) PCB with Power Supply Unit (PSU) and connectors
3. Multi-way connectors using terminal plugs for wiring of alarms and functions, Detectors
and mains power supply
4. Fuses
5. Security switch assembly
Access to the CMU is by way of the hinged display panel sub-assembly. This is retained by 4
x M6 socket head screws. Upon removal of the screws the panel can be swung away from the
main enclosure.
The display panel sub-assembly carries the main MULTIPLEX PCB type MP12 PCB v 3.2
Processing Board, with the 10-way Binary Switch and Flash Memory Chip which is attached to
the display (Monitor faceplate) by 6 x cheese head screws.
The power supply board holds the fuses, the transistor TR1, and the terminal plugs and carries
the alarm relays.

DESCRIPTION OF (Q02L) ENGINE DETECTOR

See drawing Part 1-7
(Also used for Gearbox, Chain Case and Clutch)
The assembled Detector is made from three alloy castings comprising of:
(a) Back Plate
(b) Chamber
(c) Cover
The Back Plate is permanently fitted to the engine and has inlet and outlet ports through which
the oil mist travels via the chamber assisted by a fan. There is a stainless steel filter in the inlet
port.
The chamber and cover are a sub-assembly sealed to IP65 which are factory calibrated when
manufactured. This unit cannot be calibrated or adjusted by the user.
The chamber guides the sample past the sensors. The electronics are mounted on the back
of the chamber casing and are protected by the sealed cover. The sub-assembly is fitted to
the Back Plate by 5 x screws which can be removed if and when the Detector lens requires
cleaning.
The Detector operates using the principle of light scatter (nephelometry). The power and signals
are transmitted to and from the Monitor through a single cable sending a timed analogue signal.
All Detectors sample simultaneously and continuously every half-second.
Introduction

Part1-6

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
EM6/March 2015