Stoves Archive for November 2001

Scratch that one.

Now- haven't I seen household CO alarms- similar to those lithium-battery
powered disc-shaped smoke detectors? I might be mistaken...........

elk


--------------------------
Elsen L. Karstad
elk@wananchi.com
www.chardust.com
Nairobi Kenya



----- Original Message -----
From: "AJH" <andrew.heggie@dtn.ntl.com>
To: <stoves@crest.org>
Sent: Friday, November 23, 2001 2:22 AM
Subject: Re: charcoal briquettes- 'vertical holes'


On Thu, 22 Nov 2001 09:33:48 +0300, "elk" <elk@wananchi.com> wrote:

>
>We've talked and talked about CO metering on this list, but none of our
technically-inclined members have >come up with a workable and affordable
instrument design yet. What's up guys? With all the household CO >meters
that are on the market in NorAm and Europe, we should be able to cobble
something together that's >pretty cheap and robust... and battery powered.
Once it's designed and tested I bet we could get funding >from Shell or
similar to get a couple dozen meters out in the field through this list.
THEN we can start >solving a few mysteries and educating people in a proper
hands-on manner. We all agree that seeing is >believing!
>

Here a flue gas combustion analyser seems to cost about GBP1500, a 12v
powered hot wire system for monitoring CO in car exhausts costs GBP50.
The problem is the manufacture will not divulge the algorithm which is
used to display the CO percentage. Typically it will display 2% CO in
ambient air, which suggests the calibration is to do with the thermal
conductivity AND/OR specific heat of oxygen and CO, presumably there
being a mutual inverse probability or both appearing together (unless
the car is not sparking on one cylinder). Gas sampling is propelled by
fluctuations in exhaust pressure.  It is one of those things I did not
have time to show Ronal in his brief visit, my colleagues have not let
me paly with their flue gas analyzer for comparison as its use is
restricted to lab personnel and not oily erks :-(.



AJH

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