Originally Posted by Wayward
Both the CO and LP detectors trigger the alarm at PPM levels far below that which would cause breathing problems.
True of a cO detector. Not true in the case of an LP detector. Here is a link to a Material Safety Data Sheet for propane:
Lowe explosive limit for propane is about 2.1% by volume (21,000 parts per million) as stated in the MSDS. The Atwood ProTechTor LPG detector in my Airstream Interstate is typical for hard-wired LP detectors, and triggers an alarm at approximately 2000 parts per million, or just under 10% of the lower explosive limit. Sounds safe, right? Not so.
According to the MSDS, the Permissible Exposure Limit set by OSHA is 1000
parts per million. In other words, the maximum safe level to breathe is only half
the level necessary to set off the detector. By the time the detector goes off, you're already breathing too much propane for your health.
So unless you can find an LP detector sensitive enough to warn you of 1000 ppm or less…