Duomo BX150 Manual - Página 4

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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:

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 BX150.

Example shows Intrinsic Safety on

Switch 2 on the 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 '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 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 switch in 'OFF' position

Gas Sensed

Main Alarm relay

Reset Pressed

Switch 3 on the DIP switch

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 'ON' position

Gas Sensed

Main Alarm relay

Reset Pressed

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