[Stoves] Thermometers for WBT

Crispin Pemberton-Pigott crispinpigott at gmail.com
Sun Jan 6 15:58:27 CST 2013


Dear Tom

 

Please get something with a decent thermal mass. The tiny wires spot-welded
together at the end are not very helpful at getting the temperature because
they fluctuate so rapidly when the bubbles start rising. It should have an
enclosing metal jacket of 3-8mm diameter. They still react quickly but not
'instantly'.

 

I have also found that mounting it in the centre of a pot also heated in the
centre (from below) gives misleading numbers. Prof Lloyd says there is
actually no such thing as the boiling point of a whole pot of water. My
conclusion is that the best we can get is the time at which the average
temperature reaches its maximum. Using only one thermocouple in a round pot,
it should be placed somewhere like 1/3 of the diameter towards the centre.  

 

Regards

Crispin

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Tom Miles
Sent: Sunday, January 06, 2013 2:49 PM
To: stoves at lists.bioenergylists.org
Subject: [Stoves] Thermometers for WBT

 

What are the lowest cost and most practical thermometers for the WBT? 

 

Many thanks

 

Tom

 

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