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4
Configuring the GS300M
The GS300M 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 GS300M can be configured to provide several modes of operation. The configurable parameters are:
Left switch on any of the 1st 3 double DIP switches
The GS300M 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, Zone 2 On and Zone 3 Off.
Left switch on 4th 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 GS300M.
Example shows Positive Safety on
Right switch on any of the 1st 3 double DIP switches
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, Zone 2 Toxic, Zone 3 Explosive,
Right switch on 4th double DIP switch
Main Alarm relay actuation method. This can be configured to provide either a permanent 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 for the entire period in which the gas concentration
remains above. If the switch is in the 'I' position the main alarm relay will actuate for 5 seconds and
then will return 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 permanent main alarm
Gas Sensed
Main Alarm Relay
Time
Gas Sensed
Main Alarm Relay
Main Alarm switch in ’l’ position
Time
Main Alarm switch in ’C’ position
5 seconds
