t:
01905 797989
e:
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www.duomo.co.uk
3
000
ppm
ON
1 2
ON
1 2
ON
1 2
ON
1 2
ON
1 2
4 5
N
Ph
6 7 8 9 10 11 12
4 5
3
2
1
6 7
1
2
3
4
5
6
8
7
9
10
11
12
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GS300Mc Fascia & PCB Layout
No
Description
Purpose & Functionality
1
ON
LED illuminates when supply voltage is applied.
LED flashes during self diagnosis start up.
2
SERVICE REQUIRED
This LED flashes when the scheduled service is required. Reminder set to either six months or one year
(determined by risk assessment).
Contact Duomo UK on +44 1905 797989
3
SENSORS OVERLOAD
LED Illuminated to indicate short circuit or overload on sensor circuitry.
4
BATTERY OVERLOAD
LED Illuminated to indicate incorrect battery connection or high consumption during charging phase.
5
TEST
When pressed checks the sequence and function of GS300Mc.
Press and hold to initiate a full function test, release once controller is in alarm state required
Will eventually activate all relays and their associated outputs
.
6
RESET
When pressed resets the detector after an alarm or sensor fault condition.
7
LCD Display
Represents current GS300Mc status (Normal/Test/Fault/Alarm), Connected sensors (Sensor readings and
settings scroll automatically), Indicates alarm condition and status.
(See LCD Display Interface).
8
1
st
ALARM
At 8% LEL (Explosive) or 120ppm (Toxic) gas concentration:
LED illuminates and the Pre-Alarm relay No.1 is actuated.
(This relay output deenergises when level of gas exceeds 2
nd
ALARM levels).
9
2
nd
ALARM
At 13% LEL (Explosive) or 200ppm (Toxic) gas concentration:
LED illuminates and the Pre-Alarm relay No.2 is actuated.
10
MAIN ALARM
At 20% LEL (Explosive) or 300ppm (Toxic) gas concentration:
LED illuminates and the Main Alarm relay is actuated.
11
FAULT
LED illuminates to Indicate short circuit, sensor fault, loss of signal, incorrect sensor connection or failure
(In case of sensor failure LED will flash when relevant sensor is scanned).
12
LEL (EXPLOSIVE)
LED illuminates when internal DIP switch (CO/GAS) for a sensor is moved to GAS (Explosive) position.
As the sensor value is displayed the corresponding LED for that sensor is illuminated.
13
ppm (TOXIC)
LED illuminates when internal DIP switch (CO/GAS) for a sensor is moved to CO (Toxic) position.
As the sensor value is displayed the corresponding LED for that sensor is illuminated.
14
Supply & Relay Terminals
Electrical supply and relay connections.
(See Wiring Schematic for connection instructions).
15
Sensor switches
Used to enable or disable a sensor on a zone (ON/OFF) or determine type of gas to be detected (Toxic/
Explosive) -
(See Configuring the GS300Mc section for setting instructions).
16
Positive Safety switch
Positive Safety switch
(See Configuring the GS300Mc section for setting instructions).
17
Oxygen detection switch
If set to ON then the GS300Mc can only be used for Oxygen detection and no other types of sensors for any
other gases can be used.
(See Configuring the GS300Mc section for setting instructions).
18
Sounder Operation switch
Determines if Sounder remains operational if gas levels drop below alarm threshold.
(See Configuring the GS300Mc section for setting instructions).
19
Main Alarm Relay actuation
Determines if Main Alarm relay remains in position even if gas levels drop below alarm threshold.
(See Configuring the GS300Mc section for setting instructions).
20
Emergency Stop
Connection Terminals
Remove link when Emergency Stop Button is fitted.
(See Wiring Schematic for connection instructions).
21
Sensor/ Battery Terminals
Sensor and Battery (if fitted) terminals
(See Wiring Schematic for connection instructions).
