On Thu, 10 Feb 2005 05:31:24 -0800, "John B" wrote:

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?

"ChrisGW" wrote in message
...
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.


The sensors are not as sensitive after time, due to many factors including
dirt
grease etc...

ChrisGW

The why bother with a CO detector at all, if it is in a work bench
drawer? For a CO detector to be useful it needs to be in an area with
a natural airflow. A drawer would not seem to qualify.

I suppose you could be working occasionally with a forge, or gas fired
kiln or some such thing, and then take it out only when you need it.
However, workshop environments are not usually pristine, and I would
think it would still be prudent to change it out after the expiration
date.

Gary Dyrkacz

Radio Control Aircraft/Paintball Physics/Paintball for 40+
http://home.attbi.com/~dyrgcmn/