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  #1  
Old 05-19-2008, 05:07 AM
anujab9 anujab9 is offline
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Smile PT100 equation

Hello all,

There is one Equation for PT 100 for negative temperature:
Rt = R0(1+aT+bT≤+cT≥(T-100))

R0=100 ohms
Rt is resistance of PT100
a=0.003069
b=0.000000587
c=4.27x10^-12
T temperature

so form this eq what will be the equation for T?
means T=?
Thanks in advance

Last edited by anujab9; 05-19-2008 at 05:15 AM.
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  #2  
Old 05-19-2008, 06:26 AM
Mark44 Mark44 is offline
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The equation you show is fourth degree in T. You might be able to solve it for T with the information in this topic: http://en.wikipedia.org/wiki/Fourth_degree_polynomial
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  #3  
Old 05-19-2008, 06:39 AM
anujab9 anujab9 is offline
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Smile

Hello mark

I got the equation thank you soo much.
But ther is one doubt... which root should I take for futher calculations?as there are 4 values of T
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  #4  
Old 05-19-2008, 09:07 PM
mrmeval mrmeval is offline
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http://www.omega.com/

Grab their free massive temperature book. It's worth it.

Some other info
http://www.temperatures.com/tctables.html
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  #5  
Old 05-19-2008, 09:28 PM
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hgmjr hgmjr is offline
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I suggest you put the equation into a spreadsheet and graph the equation to see what it looks like.

hgmjr
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