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Old 12-29-2014, 09:00 PM   #15
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It's still a bad idea, for the reasons already discussed earlier in the thread.
Yeah I know what you mean, Industry standards compliance is important - unless we disagree with it,
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Old 12-29-2014, 09:51 PM   #16
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let us not lose sight of the disagreement of where to mount a CO detector. Head high for a sleeping person. CO disperses through out the space, smoke rises in the space, and propane sinks to the lowest level.
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Old 12-29-2014, 10:16 PM   #17
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let us not lose sight of the disagreement of where to mount a CO detector. Head high for a sleeping person. CO disperses through out the space, smoke rises in the space, and propane sinks to the lowest level.
Both the CO and LP detectors trigger the alarm at PPM levels far below that which would cause breathing problems. Mounting them at pillow height makes sense.

The Atwood lp/co model is to be mounted no more than 18" above the floor which is about pillow height.
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Old 12-29-2014, 10:31 PM   #18
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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:
http://www.co.vermilion.il.us/MSDS/E...%20propane.pdf
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…
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Old 02-03-2015, 03:44 PM   #19
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Then you've got the opposite problem. Carbon monoxide is still lighter than air and still deadly to breathe and the detector for CO needs to be on the ceiling with the smoke alarm, not down on the floor with the LPG detector.

It's okay to combine smoke and CO detectors. It's not okay to combine LPG and CO detectors. No matter whether that combined LPG/CO detector is on the floor or ceiling, it's still in the wrong place for one of the things it's supposed to detect.
Yes this is an old post but I must reply. CO is dispersed evenly throughout the air. The place for the CO detector is not at the ceiling. It should be placed as close as possible to the head height of the sleeping person. Or at waist height otherwise. Again, CO disperses evenly throughout the room air.
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Old 02-04-2015, 05:50 PM   #20
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On the subject of CO detectors....my Interstate's CO detector has failed after two years. I unplugged it and am wondering why do I need to buy one with a 12v power supply? Why not just one with the internal 6v battery. Even the one in the Interstate had an internal 6v battery backup.
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Old 04-05-2015, 11:56 AM   #21
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Same subject. Different slant. 1 month old old safe-t-alert that won't stop blinking red/green and making that terrible noise. There is propane and the mute/reset button is not effective. Last night at midnight I took it out of the wall, wrapped it in 3 towels and a couple of hundred bucks worth of duct tape and hung it outside of the trailer. Was afraid to cut the wire because, well...I was afraid. Any ideas until I can get somewhere to have it replaced?
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