4
Agree Selectable functions with end-users:
You should agree these important functions with the customer so that
the system will operate as he/she requires:
1. Time Delay Response: available on the sounder and relay to avoid
false alarms. This is set with jumpers. The default delay is 0
minutes. You may wish to set to 15 minutes during start up and
construction if you may have VOC (volatile organic compounds)
fumes, paint etc in the rooms. They should be reset as required.
2. Siren: The units have an internal siren. You can disable this by
jumper but the default setting is “enabled” in compliance with
EN378. The customer may not want local alarms especially if you
are connecting to a remote monitoring system. Check the
customer’s preference.
3. Output: Agree the output required 4-20mA, or 0-10V etc
4. Connectivity: Decide how the outputs are to be used.
Murco gas detectors can activate external systems such as fans or
shut down and activate sirens, warning lights, activate dial out
systems, or connect to most BMS, SCADA, or other control
systems using one or more outputs.
4-20mA, 0-10V, 0-5V, 2-10V or 1-5V.
Relay 1Amp at 24VDC or 120V AC.
9 - MGS –Troubleshooting
All MGS units are checked and calibrated before shipment.
1. Symptom: Green /Red light on sensor is not lit.
Possible Cause: Power supply. Possible wiring fault . Check power
supply, check your wiring
MGS possibly damaged in transit. Check by installing another MGS
to confirm fault.
2. Symptom: red light on, green led off, indicates a fault
2.1 Sensor element may be disconnected from printed circuit board.
check to see sensor element is properly inserted into board.
2.2 If it is then possibly the sensor element has been damaged or has
reached end of life and needs to be exchanged.
Contact us for instructions and support.
3. If you experience spurious alarms in the absence of a leak, contact us for
instructions and support.
During operation record any alarms. Establish the cause or likely
cause if no leak has occurred. Report these occurrences to your
supplier or Murco, and we will advise on corrective measures.
6
5
4
3
2
1
4 3 2 1
4 3 2 1
4 3 2 1
4 3 2 1
4 3 2 1
4 3 2 1
P7
P8
1
CAL
Fail Safe
Off On
CN11
+12V
Buzz
OV
D
A
Only use 3 wires to connect the con-
troller to the MGS. If there is a 4th wire
then use this to double up on the 0V
connection between the controller and
the MGS. The 0V for the supply voltage
and the 0V for the 4-20mA output are
common. The wiring is the same for
both the Electrochemical and the Semi-
conductor and the controller wiring is
the same for both controllers.
MGS to MGD Controller wiring diagram
11 – Mounting Instructions
Diagram 3
10 – Murco Control panels
The connection diagram for connecting to an MGD panel is shown in
Diagram 3. If connecting to the ST-MON panel refer to the ST-IAM manual.
MGS Standard Sensor
Vent pipe indoor 1’’ BSP head 3m cable
IP55 Low Temp
86.0 53
36.00
04.5
09.0
43.0
120
120
7.0
103.50
8.0
O
4
.
5
0
25.00 25.00
75
122
152
122
140
Mounting Holes
2 x Clearance for M6
1
4
7
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