Duomo GS920 Podręcznik - Strona 3
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Drukuj stronęConfiguration and Testing
Important Notes
IMPORTANT: Assembly / maintenance of the appliance must be carried out by qualified personnel and in
accordance with applicable laws and regulations.
The manufacturer assumes no responsibility for the use of products that have to comply with particular
environmental and / or installation standards.
IMPORTANT: Before connecting the equipment, it is recommended that you read the instruction manual
carefully and keep it for future reference.
Electrical Connections
IMPORTANT:
and the connections according to Regulations in force, keeping in mind that the signal cables should be laid
separate from the power cables.
Power ON and Testing
Once the device has been turned on, the MAINS LED will blink for approximately 60 seconds, after which it will remain
ON.The GS920 will then be ready for detection.
Press the TEST button on the PCB to simulate a gas leak. The ALARM LED will light up and the relay will actuate after 5
seconds. After the alarm, the LED will turn itself off, the buzzer will stop and the connected appliances will be turned off. To
complete the test, issue gas from a pre-calibrated bottle of Duomo test gas.This test should be carried out at least once a
year. (Do NOT use a cigarette lighter to perform a test as this could damage the sensor).
Configuring the GS920
The GS920 has two DIP switches on the PCB.The left switch is used to activate the intrinsic safety option.The right switch is
used to select a pulsed output to a connected gas valve. The GS920 can be configured to provide several modes of
operation.The configurable parameters are:
Switch 1 on the DIP switch
Intrinsic safety determines the condition of the main alarm relay and hence the operation of the gas
valve. When it is 'ON' the relay is in a normally open state.When it is 'OFF' the relay is in a normally
closed state. NOTE: This affects how the gas valve operates and means that you may need to
change how it is wired to the GS920.
Example shows Zone 1 On.
Switch 2 on the DIP switch
Main alarm relay actuation method.This can be configured to provide either a continuous or a pulsed
output alarm operation, whilst gas is sensed. When the main alarm is actuated in an alarm condition,
if the switch is in the 'ON' position the relay is set to impulse functioning. Each pulse lasts about 30
seconds. Positioning the switch to 'OFF' the relay goes into continuous functioning mode, until the
gas level drops under the alarm threshold.
Example shows Zone 1 Explosive.
Main Alarm switch in 'l' position
Gas Sensed
Main Alarm Relay
Reset Pressed
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Before connecting to the mains power, ensure the voltage is correct. Carefully follow the instructions
1 minute
Time
Main Alarm switch in 'C' position
Gas Sensed
Main Alarm Relay
Reset Pressed
3
Time