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)