Atmospheric Oil Mist Detection System
MULTIPLEX
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
Introduction Part1-5
DESCRIPTION OF CENTRAL MONITORING UNIT (CMU)
The CMU contains:
1. Display panel with MULTIPLEX PCB
2. Power Supply Board with Power Supply Unit (PSU)
3. Multi-way connectors using terminal plugs and Harting connectors for wiring of
alarms and functions, Sensors and mains power supply
4. Fuses (FS1, FS2, FS3 and FS4)
5. Security key switch assembly (Part 1-3)
1. DISPLAY PANEL (Part 1-3)
Access to the CMU is by way of the hinged Display Panel sub - assembly. The 4 x M6
socket head screws retain the display panel. Upon removal of the screws the panel can
be swung away from the main enclosure.
PCB (Q0106) (Part 1-3)
The display panel sub-assembly carries the main MULTIPLEX PCB type MP12 v 3.2
Processing Board, with the Binary Switch and Flash Memory Chip which is attached to
the display (Monitor faceplate) by 6 x cheese head screws.
2. POWER SUPPLY BOARD with PSU
The Power Supply Board consists of a switch mode power supply unit mounted on a
PCB. The PCB holds the fuses, the transistor TR1 (Q0111), and the terminal plugs and
carries the alarm relays.
3. MULTI-WAY CONNECTORS
The terminal plugs and Harting connectors used for wiring are provided as part of the
QMI MULTIPLEX system. It is very important that the installers pay attention to the
pins of connectors so as not to damage the plugs or sockets and to ensure a good
connection.
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