Duomo gas proving systems
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Duomo gas detection
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Duomo carbon dioxide sensors
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Duomo ventilation interlocks
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Are available direct or from all major stockists
BX116 operation
Maintenance procedure
This detector must be function checked as described above using calibrated test gas every 6 months. To arrange for a
Duomo engineer to conduct this work or to arrange a service contract please call 01905 797989.
Before powering up the BX116 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 L.E.D.'s.
3. The ON L.E.D. 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.
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 L.E.D.'s and audible alarm.
The sequence will be:
a) The 8% L.E.L. / 120
ppm
and Pre-Alarm 1 L.E.D. will be actuated. The Pre-Alarm 1 relay will be changed over.
b) The 20% L.E.L. / 300
ppm
and Main Alarm L.E.D. will be actuated. The Main Alarm relay will be changed over. The
relevant Alarm L.E.D.'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% L.E.L. for methane in air
- 350
ppm
for carbon monoxide
- 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.
