[TheForge] K thermocouple

[James Binnion]

Just dont expect accurate temperature readings (better than +-50  
degrees) unless you use reference junctions and precision meters.
On Nov 18, 2005, at 7:13 AM, Grover Richardson wrote:

> Reference table is at http://www.omega.com/temperature/Z/pdf/ 
> z204-206.pdf
>
> If using an analog meter, it's simple to take the meter front off  
> and glue
> on a new face.  Do a drawing in AutoCAD or whatever you feel  
> comfortable
> with, and make a custom scale.  I did that several times for side  
> work.
> Even put their company name on the meter face.
>
>
>
>> *>-----Original Message-----
>> *>From: theforge-bounces at mailman.qth.net
>> *>[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Bruce  
>> Freeman
>> *>Sent: Friday, November 18, 2005 10:09 AM
>> *>To: theforge at mailman.qth.net
>> *>Subject: RE: [TheForge] K thermocouple
>> *>
>> *>
>> *>Chris,
>> *>A must is the thermocouple table for the type-K
>> *>thermocouple. Ideally, you will use two identical
>> *>thermocouples, back-to back (so to speak), and put one of
>> *>them (the "reference junction") in an ice bath. A close
>> *>second is to leave the reference junction at room
>> *>temperature and to subtract that temperature (directly if
>> *>using Celsius, or subtract then add back 32F, if using
>> *>Fahrenheit) from the reading from the table. For furnace
>> *>temperatures, you can skip the reference junction altogether
>> *>and measure directly, and your error will probably be so
>> *>slight as not to matter to you. Connect one lead to the
>> *>positive pole of the meter, the other to the negative.
>> *>Ignore the sign of the mV reading.  (Or, flip the leads
>> *>around if you prefer.)  You'll read some value in mV.  Go to
>> *>the thermocouple table and read what that means in degrees C
>> *>or F. Bruce NJ
>> *>
>> *>>>> crimsonkil at lycos.com 11/17/2005 7:09:33 PM >>>
>> *>Thanks Mark,
>> *>      Should have mentioned that I can make the electrical
>> *>connections, just trying to find how to interpret the
>> *>multimeter readings.
>> *>
>> *>-Chris K.
>> *>
>> *>----- Original Message -----
>> *>From: "Mark A. Pesetsky" <pesetsky at Princeton.EDU>
>> *>To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
>> *>Subject: RE: [TheForge] K thermocouple
>> *>Date: Thu, 17 Nov 2005 19:02:55 -0500
>> *>
>> *>>
>> *>> With one of these:
>> *>>
>> *>> http://www.newportus.com/images/products/k4p8.GIF
>> *>>
>> *>> Mark
>> *>>
>> *>>
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James Binnion
jbin at well.com