AC Smoke Detectors


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Old 11-21-06, 02:41 PM
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AC Smoke Detectors

When we added a second floor to our vintage 1925 bungalow four years ago, we got wired for AC smoke detectors (ionization). So far so good.

The problem now is that the detectors have been delivering false-positive shrieks -- especially impressive on a wired circuit. It's the middle of the night stuff that is a little hard to take.

Any ideas? I've replaced a couple, incidentally changing out the ionization version for a for photoelectric outside the kitchen.

These new innovations in fire safety (wired detectors, sprinklered residences) are great on the drawing board, but false alarms are a dangerous hazard that receives little attention.
 
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Old 11-21-06, 04:51 PM
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Switching to the photoelectric is the way to go. The Ions are more sensitive in some ways, but they rely on a sensing element that literally has a half-life, and so breaks down. The main cause of the false alarms is moisture condensing in the sensing chamber when the temperature and humidity are just right.

Trust me, the difference in sensitivity is pretty much a matter of fractional seconds in the real world.
 
 

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