LPG sensors have been mandatory on boats for years, so we've been through a few. Most use a heated semiconductor hydrocarbon detector, so they draw a bit of 12V to keep running. As LPG is heavier than air and pools, just pick a location its likely to fall and stay and plop one or more there. On the boats we had them hooked up to a solenoid on the bottle so any trip of the sensor immediately cut the gas supply whilst letting us know in no uncertain terms it was going off (a demented canary through a megaphone sort of thing).
Between the sensor and solenoid, it was nearly an amp continuous on the 12V.
As for recommendations, they were all much of a muchness. Being mandatory on boats, there's stacks around.


) smells, so far. Its about fractures in aluminium lines??



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