Duomo GS100M Manual - Page 4

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Configuring the GS100M

The GS100M has three pairs of DIP switches on the PCB. The left switch on first three double switches is used to enable

or disable the sensor for that respective zone. The right switch is used to configure the controller to indicate whether the

connected sensor is for explosive or toxic gas.

The GS100M can be configured to provide several modes of operation. The configurable parameters are:

Left switch on any of the 1st double DIP switch

The GS100M will not look for a sensor on a given zone if the switch is moved to the OFF position.

It is not necessary to remove the return cable from the sensor.

Example shows Zone 1 On.

Right switch on any of the 1st double DIP switch

Toxic or explosive levels. These are labelled as GAS or CO on PCB. The symbols on the front fascia

of the detector are EN standard symbols and refer to any explosive or toxic gas. If toxic gas, e.g.

carbon monoxide is to be sensed on a given zone move the switch to the CO position. If explosive,

e.g. natural gas, LPG, hydrogen etc. move the switch to the GAS position.

Example shows Zone 1 Explosive.

Left switch on 2nd double DIP switch

Positive 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 GS100M. Example shows Positive Safety on

Right switch on 2nd double DIP switch

Main Alarm relay actuation method. This can be configured to provide either a latching or a temporary

alarm operation. When the main alarm is actuated in an alarm condition if the switch is in the 'C'

position the relay will remain in this position even after the concentration of gas has reduced below

the alarm threshold. If the switch is in the 'I' position the main alarm relay will actuate for 60 seconds

and then if the level of gas has dropped will return to the volt-free main alarm relay to the running

condition.The indication on the panel fascia and the audible alarm will still indicate main alarm. This

mode of operation is used when using manual reset gas valves and battery back-up systems for

extending standby battery life. Example shows detector configured for a latching main alarm

Main Alarm Relay

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Main Alarm switch in 'l' position

Gas Sensed

1 minute

Reset Pressed

Main Alarm Relay

Reset Pressed

Time

Main Alarm switch in 'C' position

Gas Sensed

Time