[Stoves] Measuring temperature

[Crispin Pemberton-Pigott]

Dear Frank

 

Paint a small circle about 40mm in diameter black. But don't paint the rest.
The circle will give you some idea of the temperature of the rest of the
stove, but if you paint the whole thing it will shed heat much more
effectively and cool considerably.

 

Your IR thermometer should also have a contact tip - a thermocouple on a
wire that plugs into it. Put the tip on the hot surface to get a reading. By
comparing it with the IR reading, you can calculate a correction factor.
That can be used to calculate the emissivity value (if you want it).

 

Regards

Crispin

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Steve Taylor
Sent: Saturday, January 12, 2013 6:21 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Measuring temperature

 

 

On 12 January 2013 00:21, Frank Shields <frank at compostlab.com> wrote:

Stovers,

 

I was running an experiment using shinny stove pipe as a 'stove' and using
the IR detector was measuring the temperature on the outside of the pipe. It
read about 30c. But was much higher as noted when I tried to hold the pipe.
Is this inaccuracy due to the reflective surface?


Hi Frank, 
Yes, you've run into the issue of emissivity of the pipe - black emits
better than shiny. 

Steve 

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