[TheForge] K thermocouple

[Grover Richardson]

Nanmac corporation also.  Good source of info and parts.



>*>-----Original Message-----
>*>From: theforge-bounces at mailman.qth.net 
>*>[mailto:theforge-bounces at mailman.qth.net] On Behalf Of 
>*>Hochewa at aol.com
>*>Sent: Thursday, November 17, 2005 11:11 PM
>*>To: theforge at mailman.qth.net
>*>Subject: Re: [TheForge] K thermocouple
>*>
>*>
>*> 
>*>To All,
>*>And another thing....
>*>Thermocouple tables relate T vs mV outputs against a 
>*>reference  junction of 
>*>usually 0*C.  Handheld units are self referencing.  Type K  
>*>may not be the best 
>*>considering the normal range at which they are used and the  
>*>atmospheres most 
>*>suited to them.  Omega is a gold mine of thermocouple  information.
>*> 
>*>Hochewa
>*> 
>*>In a message dated 11/17/2005 7:24:49 P.M. Eastern Standard Time,  
>*>jbin at well.com writes:
>*>
>*>You  really need a way to amplify and linerize the 
>*>thermocouple output   
>*>voltage as it is not a linear degree/volt output. There are  
>*>dedicated  
>*>meters called pyrometers that correct some of this with  their  
>*>calibration on the faceplate. Go to  
>*>http://www.omega.com/temperature/ 
>*>Z/pdf/z021-032.pdf for a 
>*>polynomial  formula that will allow you to  
>*>figure out what voltage corresponds  to what temperature. You will  
>*>need a very accurate meter as the  voltage output from a type K  
>*>thermocouple is a maximum of 50  millivolts (.05 volts) .  
>*>To see a 1  
>*>degree C change you will  need a meter that has a sensitivity of . 
>*>00004 volts or  beter.
>*>
>*>Jim
>*>
>*>
>*>
>*>
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