From my Nighthawk manual, page 1-6:
"While it is not required, on occasion you may wish to observe and
become familiar with your alarm's response in the actual presence of
carbon monoxide or Gas. The best and safest way to do this is with
either a cigarette or an incense stick."
In Memoriam: Julius the cat April 1, 1993 - February 3, 2005
Never forgotten: Chane, Tigger, Koshka, Serenity, Rocky
What if the tester is not permanently mounted? That is, what if the tester
is brought out only occasionally, from my work-bench drawer?
I know batteries have a shelf life, even if they aren't being used. Are CO
alarms similarly limited?
I'm not proposing continual surveillance for CO. I'd only pull my CO tester
out of the workshop drawer occasionally, take it to some heater I'm
interested in, and test the exhaust gasses, room air, etc.
If the company that makes the alarm tells you to replace it after five or
ten years they only have to charge you for that many years of liability in
the purchase price.
Hope this helps,
I was told in my nfpa based training every 10, since a decade passing
brings new 'features' in the new products, and circuitry isn't tested
to last beyond a decade of use.
Might be a UL issue.
tom @ www.URLBee.com
That sounds almost like an old safety NCO that said a knot
in an electrical cord was bad because the electrons had to
speed around the corners and that made the wire hot.
Apparently your instructors fall into the same category. I
would be very leery of any of their personal descriptions of
how things work.
Some sensors have a limited lifetime. But many old smoke
detectors are based on a light sensor and there is no reason
that the circuit wouldn't last for decades. My original
smoke detector still works after nearly 30 years. I've got
another 10 year old smoke detector (ionization type) which
is still so sensitive it goes off every time somebody make
Subject: Re: CO alarms.
=> George E. Cawthon <= wrote:
The bottom line is, the NFPA recommends replacing any smoke detector every ten
years. Unless you have the equipment to test the sensitivity of the unit, you
can NOT be sure it is functioning correctly. In fact, for commercial
applications - they MUST be tested for sensitivity range every year, or be
All you cheap bastards:
Replace your smokes if they are over 10 years old.
On Fri, 11 Feb 2005 05:06:39 GMT, "George E. Cawthon"
For like 10 bucks, is it worth it? I mean if the smoke detector meant
to be replaced after 10 years(why now some come with 10 year batteries
so you just toss when the battery dies), you might be gambling with
Just say 10 bucks is cheap.
Who says it is meant to be replaced after 10 years? Not on
the unit. Not in the instruction manual. It is an ac wired
unit intended for long term use. Give it a test like the
instruction say and if it passes it is ok. Blindly
following some arbitrary rule for replacing the unit is not
only stupid but wasteful of resources. Test the damn thing.
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