Duomo BX150 Handbuch - Seite 8

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BX150 Operation test proceedure

Before powering up the BX150 once again check that all electrical connections are correct.

Apply power using the proper external switch. This switch should be fitted with protection fuses.

All of the lights on the fascia will light up in turn.This will take approximately 20 seconds.This checks the function of all

the LED's.

The ON LED will remain flashing for about 90 seconds. This is the sensor warm-up period. The gas detector will not

provide gas detection during this period. When the ON light becomes constant the detector is in operation.

By pushing and maintaining pressure on the manual TEST button a function test can be performed.

The sequence will be:

a) The 8% LEL / 120ppm LED will be actuated.

b) The 13% LEL / 200ppm and the pre-alarm LED will be actuated.The pre-alarm relay will be changed over and the buzzer

will then issue a low frequency sound.

c) The 20% LEL / 300ppm and main alarm LED will be actuated. In addition to keeping the pre-alarm relay switch on, the

main alarm relay will be changed over. The alarm LED will light to show that the system is in alarm and the buzzer will

issue a higher frequency sound.

By releasing the the manual TEST button the LED's will go out and the audible alarm will cease. If a latched alarm

function on the main relay is configured this will remain on until the RESET button is pressed.

In order to conduct a full function test it is essential to use Duomo or equivalent calibrated test gas. The maximum concentrations are;

•

40% LEL for Methane in air

•

350ppm for Carbon monoxide

•

0.85% (MOL) for Propane

Using higher concentrations can reduce sensor life. Note: Never test using neat gas. This will poison the sensor.

To simulate a sensor fault situation disconnect the sensor plug. The detector will go into a FAULT alarm and the sensor

fault relay will be actuated.

The control unit will then carry out the following:

a) The FAULT and MAIN ALARM LED's will light up and blink

b) The buzzer will issue a continuous sound

c) The FAULT and MAIN ALARM relays will switch.

Reconnect the return cable and press RESET to restore the control unit functioning.

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