Electronic gas detectors, at least those that are commercially available, can only detect propane/butane in concentrations above about 1000ppm, at which level you or I will be gagging and passing out. If your ears were to be within audio range of a gas detector’s buzzer your nose would be aware of a gas leak at a concentration a lot lower than the detection threshold of the detector.
The device that we offer as an add-on to the caravan mover remote control is intended to alert you to a dangerous gas situation when you are some distance away such as at the beach or the supermarket – far out of reach of the smell or the sound of a buzzer. You should then know to return to your caravan with plenty of caution and as a first step close the gas cylinder valve, and maybe open the door for ventilation, before retreating to a safe distance while the gas dissipates.
The alarm indication on the mobile’s screen is also not intended to be much more than a convenient way to test the operability of the detector, since the same conditions apply: if you’re within Bluetooth range of the caravan you’ll be able to smell the gas that’s leaking.
To test the detector you just emit a whiff of gas from an unlit butane lighter – you get an immediate reaction on the screen and, if the SIM card has sufficient prepaid credit, an SMS within a few seconds.