ROUTINE TESTING
You are advised to ask the installer to give the detector a general test at
least once a year.
IMPORTANT: Do not use pure gas, such as that in a lighter,
directly on the sensor since the sensor could be irremediably
damaged.
OPERATION TEST
In the case of the
Beta
SE330K and SE333K models, before carrying out
the operation test, open the cover under the three LED lights (Fig. 9) with
a flat-headed screwdriver.
Fig.9
When this is done, it is possible to test operation of the instrument by
pressing and holding the little TEST button on the
Sensor module
(Fig.
10) of the
Beta
SE330K and SE333K control unit for at least 2 seconds,
or the button on the card of the
Beta
SE396K remote detector, if connected,
for at least 30 seconds.
All the LEDs turn on and the buzzer and relay output are activated for 5
seconds.
Fig.10
You will then need to re-engage the electric valve connected to the output
of the gas detector (if present).
SENSOR MODULE
Detected gas
ZSDM1
Methane
SE330/SE333KM
ZSDG1
L.P.G.
SE330/SE333KG
Code
Model
N.B.
Make sure the
code
of the new
Sensor module
matches the
code
on the
Sensor module
to be replaced.
1_Turn off the detector, unplug it
from the mains and use a
screwdriver to lever off the little
cover under the three LEDs (Fig.
11).
2_Undo the two screw
fasteners on the Sensor
module to be replaced (Fig. 12).
Fig.12
Fig.11
NA
C
NC
R
R
+
-
1 2
3
5
4
6
7 8 9
NA
C
NC
R
R
+
-
1 2
3
5
4
6
7 8 9
230Vac 50Hz
230Vac 50Hz
NCGAS GAS EV
SE333K
SE333K
SE333K
12Vdc
12Vdc
NC GAS GAS EV 12Vdc N.C.
SE333K
SE333K
Connection with Normally Closed manual reset electric valve (with relay
normally activated) and a second SE333K detector.
Connection with 12 Vdc Normally Closed manual reset electric valve (with
relay normally activated) and a second SE333K detector.
LOWER EXPLOSIVE LEVEL (L.E.L.)
You need to use a calibration cylinder with sample gas to test correct
operation of the sensor.
If you wish to recreate the dangerous conditions the gas sensor is meant
to protect against, do not use the gas of normal domestic appliances. Our
detectors are calibrated at 10% of the LEL (lower explosive level).
Here is a simple explanation: as an example, a kitchen measures 3 metres
in width, 4 metres in length and 3 metres in height.
- The volume of the kitchen is equivalent to 4 x 3 x 3, and therefore 36 m³
or 36,000 litres.
There is a dangerous mix when methane accounts for 5% of the volume of
the kitchen.
- This 5% is called the LEL (lower explosive limit).
- In this case, 5% of 36,000 litres is 1800 litres (LEL).
- Our detectors, being IMQ certified, are activated at 10% of the LEL and
therefore at 10% of 1800 litres which, in this case, is 180 litres, AT ONE
TENTH OF THE LOWER EXPLOSIVE LIMIT (LEL).
Taking into account the fact that a domestic hob has a nozzle a few tenths
of a millimetre in length and that the pressure is just a few millibars, it would
take several hours to produce 180 litres of methane (and trigger the sensor).
Even if the nozzle is larger, the very particular and strong odour of methane
would make it impossible for anyone in the room not to notice and realise
the serious danger, even when the amount of methane in the room is too
little to cause an explosion.
REPLACING THE SENSOR
N.B. The Sensor module must be replaced by a specialized
technician.
The sensor module should be replaced no more than TWICE, for a
total product life-span of 15 years.
Replace the Sensor module if the “FAULT” LED starts blinking, or by the
expiry date on the label on the cover.
Replace the label on the cover stating the expiry date (5 years after the
date of installing the new sensor module); this label must be compiled by
the person who installs the detector at the time of replacing the sensor
module.
