On Sat, 12 Feb 2005 06:57:57 GMT, "George E. Cawthon"
wrote:

wrote:
On Fri, 11 Feb 2005 05:06:39 GMT, "George E. Cawthon"
wrote:


wrote:

On Thu, 10 Feb 2005 05:25:23 GMT, "Bill Browning"
wrote:



They say to replace your CO alarms every 5 or 10 years. Why? If they still
test OK, why replace them?
Bill B.



imho:

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.

hth,

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


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
lives.

Just say 10 bucks is cheap.


another 10 year old smoke detector (ionization type) which
is still so sensitive it goes off every time somebody make
toast.




later,

tom @ www.ChopURL.com
Who says it is meant to be replaced after 10 years? Not on

NFPA Does: http://www.chopurl.com?619



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.