Duomo BX150 Manuel - Page 4

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Duomo BX150 Manuel
Configuring the BX150
The BX150 has a DIP switch on the rear panel. Switch 1 is used to control the main alarm delay. Switch 2 is used to configure
the main alarm latching mode. Switch 3 is used to select whether the unit detects toxic or explosive gases.
The BX150 can be configured to provide several modes of operation.The configurable parameters are:
Dip Switch 1
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 BX150.
Example shows Intrinsic Safety On.
Dip Switch 2
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 'ON'
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 'OFF' position the main alarm relay will actuate for 60
seconds and then if the level of gas has dropped will return to the voltfree 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 latching main alarm configuration.
Main Alarm Relay
Dip Switch 3
Type of gas to be sensed.These are GAS or CO.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 OFF position. If explosive, e.g. natural gas, LPG,
hydrogen etc. move the switch to the ON position.
Example shows explosive gas setting.
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Main Alarm switch in 'OFF' position
Gas Sensed
1 minute
Reset Pressed
Main Alarm Relay
Reset Pressed
Time
4
Main Alarm switch in 'ON' position
Gas Sensed
Time