Re: GAS-L: Re: Measuring temperature

[Peter Singfield <snkm@btl.net>]

Dear Tom and All:

Is that problem over come when the TC is in a "well"??

such a well being a thick inconel tube -- blocked at one end -- with the
other open to accept the thermocouple. The closed end inserted in the area
for temperature measurement -- the open end outside that area with leads to
the instrument.

I just bought a Triplett multimeter (model 9015) that besides measuring
voltages, amps, resistance, capacitance -- also counts frequency and does a
K type TC to 1200 C

Cost was $60.

For an extra $60 you can get this with an interface for serial
communication to any computer.

And -- it has 1 inch digital read out for us older guys with compromised
vision.

Just search "Triplett meters" on Google for more info.

I found the best price -- bought it by I-net -- and had it mailed to me
here in Belize. From beginning to end -- two weeks.

Peter

At 09:17 AM 3/11/2002 -0700, Thomas Reed wrote:
>Dear Ron and All:
>
>Thermocouples are cheap and dependable for measuring temperatures, type K
>(Chromel Alumel) up to 1200 C.
>
>However, be careful to know what you are measuring.  A thermocouple placed
>in a gas stream will radiate energy and read a temperature reflecting the
>balance between convection in from the gas (weak, but velocity dependent)
>and radiation out from the solid thermocouple (increasing with T^4).
>
>Thus a metal thermocouple placed in a gas at 1600C may only read 1000 C.  It
>is amazing how few good engineers realize this problem.  (There are methods
>for correction, but much more complex and costly.)
>
>I have a 12 point manual thermcouple digital readout on my panel board, cost
>about $150.
>
>Yours truly,                    TOM REED            BEF
>
>
>----- Original Message -----
>From: "Ron Larson" <ronallarson@qwest.net>
>To: <stoves@crest.org>
>Sent: Monday, March 11, 2002 8:55 AM
>Subject: Fw: Measuring temperature
>
>
>> stovers:
>>
>>     Getting this message from the solar cooking list, I looked up the web
>> site below and found a good selection as advertised.  I have ordered their
>> free literature - but not yet ordered any equipment.
>>
>>     My question is whether anyone on the stoves list has used thermometers
>> to try to increase efficiency.  I don't remember any discussion of this
>> topic.  Seems like we should be able to reduce excess secondary air and/or
>> change parameters to increase the temperature at the bottom of the pot -
>or
>> reduce it at the top and have a pretty good real-time stand-in for
>> efficiency.
>>
>>     Some of the thermometers shown have wide temperature range, multiple
>> inputs, digital readouts and prices near $100.  Any thoughts?
>>
>> Ron
>>
>>
>>
>> ----- Original Message -----
>> From: Chris Keavney <Ckeavney@mkl-mmaf.org>
>> To: <solarcooking-l@igc.topica.com>
>> Sent: Monday, March 11, 2002 7:18 AM
>> Subject: RE: Measuring temperature
>>
>>
>> TWIMC:
>>
>> My source for temperature-measureing equipment is Omega Engineering of
>> Stamford, CT (www.omega.com).  They are a supplier for industry and
>> laboratories, and they have a huge selection.
>>
>>
>>
>> Chris Keavney
>> Maryknoll Mission Association of the Faithful
>> PO Box 307
>> Maryknoll, NY 10545
>> 914-944-0300 ext. 221
>>
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