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The Deffender SDI methane gas detector is ideal for residential environments. Deffender SDI detects methane gas and LPG. Both the detector and a solenoid valve with 9 VDC power supply are included in the package.



Deffender SDI Accurate warning
Accurate warning If the gas sensor is not working properly, the detector will emit a short audio signal followed by a four second pause. The red LED will then be lit.
Deffender SDI Dual functionality
Dual functionality Deffender SDI can detect both methane and butane gas (LPG). However, depending on which gas you want it to detect, you need to follow the steps in the manual for proper placement.
Deffender SDI Silent function
Silent function When the Deffender SDI detector has triggered the alarm, the audio signal can be turned off by pressing the “Test” button. The piezo siren will be turned off for five minutes. The red LED will flash.


Detector specifications
Power supply
230 VAC, 50/60 Hz
Power consumption
< 2W
Gas detection
Gas butane (GPL), gas methaneGas butane (GPL), gas methane
Alarm level
10% L.E.L.
Sensor type
SnO2 semiconductor
Piezoelectric alarm
85 dB la 1 m
Operating temperature
+ 2 °C … + 40 °C
10% … 90% RH (non-condensing)
Protection class
70 x 115 x 44 mm
approx. 150 gr.
Electrovalve specifications
Power supply
Operating temperature
2°C – 40°C
Reset mode
Maximum pressure
500 mbar
Reaction time
< 0,3 seconds
Flow rate
Plug diameter
3/4′ (unless otherwise specified on box)
Equipment warranty
2 years

Frequent questions

How do I mount the Deffender SDI for butane gas detection?
Installation should be done in low places (approx. 30 cm above the floor) because butane gas (LPG) is heavier than air.
How do I install Deffender SDI for methane gas detection?
Installation should be done in high places (approx. 30 cm from the ceiling) because methane gas is lighter than air.
I smell gas, but the detector doesn't respond
The unpleasant and easily recognisable smell (an unpleasant sulphurous odour) of natural gas used in homes is due to odorant additives, such as tert-butylthiol, which are used for safety. Most people can detect this smell at fairly low levels of gas concentration (2% L.I.E. or less), but certain disabilities or advancing age can lead to a reduction in this smell sensitivity. The L.I.E. (Lower Explosive Limit) of the gas defines the minimum volume ratio of combustible gas or vapour in the air in which an explosive atmosphere will form. The detector is calibrated to trigger the alarm at the threshold of 10% of the L.I.E. of the detected gas. Thus, it is possible for a person to smell gas before the alarm is activated. This does not necessarily indicate a fault in the device. For humans, a gradual increase in gas concentration may also go unnoticed due to olfactory fatigue. Translated with www.DeepL.com/Translator (free version)
Methane gas detection equipments

Defender SDI

Product code: 3710015
Methane gas protection equipment - Deffender detector and solenoid valve
  • Accurate warning
  • Dual functionality
  • Silent function