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Mike Lamb
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Most CO detectors do not annunciate until the concentration hits 50 ppm. 50 ppm is above the limit at which fire rescue personel in some states may enter a dwelling to rescue someone, unless they are equipped with their own breathing apparatus.

The problem is the cost. The cost to manufacture a CO detector that can detect a lower ppm is too high to sell successfully on the residential market.

That's what I learned several years ago from a presentation by Bacharach. Perhaps the technology has improved since.

I mention this in reports on dwellings in which CO detectors are used to provide the primary defense against CO asphyxiation.

Marc

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Most CO detectors do not annunciate until the concentration hits 50 ppm. 50 ppm is above the limit at which fire rescue personel in some states may enter a dwelling to rescue someone, unless they are equipped with their own breathing apparatus.

The problem is the cost. The cost to manufacture a CO detector that can detect a lower ppm is too high to sell successfully on the residential market.

That's what I learned several years ago from a presentation by Bacharach. Perhaps the technology has improved since.

I mention this in reports on dwellings in which CO detectors are used to provide the primary defense against CO asphyxiation.

Marc

The alarms sound in response to a time/concentration function rather than at a specific level of CO.

The early alarms sounded at lower time/concentration levels than the newer ones do. This resulted in lots of fire departments responding to lots of CO alarms. By the time they got to the house, the ES personnel couldn't find any CO. It was such a big problem that UL raised the threshold limit on the alarms. That's why we're at where we're at now.

If someone wants a CO alarm that reacts to lower levels of CO, check out www.aeromedix.com

- Jim Katen, Oregon

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