Duomo BX444-Mc Instalasi dan Panduan Pengguna - Halaman 7

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Duomo BX444-Mc Instalasi dan Panduan Pengguna

Switch 3 on 2nd DIP switch set

Determines whether the audible alarm remains operational after levels

have dropped. In memory mode, the alarm remains and will need to be

manually reset. In non-memory mode, the alarm will automatically reset

after levels have dropped.

Example shows memory on

Switch 4 on 2nd DIP switch set

With switch 4 in the on position the BX444Mc is configured to indicate

oxygen levels. The function is determined by setting either excess oxygen

or oxygen depletion on the sensor itself (Duomo SGF104).

IMPORTANT NOTE.

If Oxygen setting is selected it is not possible to connect any other types of

sensors for any other gases. For example natural Gas or CO

BX444-Mc Operation

Before powering up the BX444-Mc once again check that all electrical connections are

correct.

1. Apply 230V supply to the Ph and N terminals. Ensure that the correct fuse is used in the supply. (3 or 5A max.)

2. 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.

3. The ON LED will remain flashing for about 2 minutes. 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.

4. By pushing and maintaining pressure on the manual TEST button a function test can be performed for all pre-alarm

relays and main alarm relay, together with LED's and audible alarm.

The sequence will be:

a) The 8% LEL / 120

ppm

terminals 6 and 7 will be connected.

b) The 13% LEL / 200

ppm

terminals 8 and 9 will be connected and the audible alarm will continue to sound.

c) The 20% LEL / 300

ppm

10 and 11 will be connected, connection between terminals 10 and 12 will be broken and the audible alarm will continue

to sound. (When 'Intrinsic Safety' is on, terminals 10 and 11 will be broken and 10 and 12 will be connected). The relevant

Alarm LED's will light to show which zones are in alarm.

By releasing the the manual TEST button the lights 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.

5. 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

- 350

for carbon monoxide

ppm

- 0.85% (MOL) for propane

Any higher than this can reduce sensor life. NOTE: NEVER TEST USING NEAT GAS.THIS WILL POISON THE SENSOR.

6. 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. This will close the contacts between terminals 4 and 5 and open the contacts between

terminals 10 and 12 (Main Alarm relay). When the plug is reconnected the detector can be reset.

w: www.duomo.co.uk

and Pre-Alarm no. 1 LED will be actuated. The Pre-Alarm relay no.1 will be changed over and

and Pre-Alarm no. 2 LED will be actuated. The Pre-Alarm relay no. 2 will be changed over and

and Main Alarm LED will be actuated. The Main Alarm relay will be changed over and terminals

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