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07-01-2007 06:52 AM

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Hi

cn some one help me to slove this equation.

cn some one help me to slove this equation.

where R0 is the resistance which I read at runtime,

Temperature below 0 degree Celcius.

RBaseT = R0[1 + A X T + B X Tpow2 + C X Tpow3 X (T - 100 degree celsius)]

Temperature above 0 degree Celcius.

RBaseT = R0[1 + A X T + B X Tpow2]

where

RBaseT = RTD resistance at temperature T

R0 = RTD nominal resistance at 0 degree celcius

A,B,C are coefficients given

A = 3.18 X 10pow-3

B = -6.02 X 10pow-7

C = -6.0 X 10pow-12

Temperature below 0 degree Celcius.

RBaseT = R0[1 + A X T + B X Tpow2 + C X Tpow3 X (T - 100 degree celsius)]

Temperature above 0 degree Celcius.

RBaseT = R0[1 + A X T + B X Tpow2]

where

RBaseT = RTD resistance at temperature T

R0 = RTD nominal resistance at 0 degree celcius

A,B,C are coefficients given

A = 3.18 X 10pow-3

B = -6.02 X 10pow-7

C = -6.0 X 10pow-12

Thanks in advance.

07-02-2007 11:06 AM

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Hi Sujeep,

I know that this equation is used in our FP-RTD-122 modules, but I am not sure why you need this equation solved. Are you trying to double check the modules output against the equation?

Regards,

Michael

Applications Engineering

National Instruments

Michael

Applications Engineering

National Instruments

07-03-2007 03:32 AM

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Hello Mr.Michael

I am reading the resistance value from fieldpoint and converting into temperature by using the formula

(2.5641 X Resistance value) + 16.59 = Temp in K. i.e., y=mx+c.

But this is not accurate value. so I want to make use of the formula provided by NI. Kindly look into the attachment.

Thanks.

07-09-2007 12:24 PM

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This calculation can be made quite easily with the use of a formula node. The formula node will take in all of the inputs for this equation and will give you a result. I have attached an example that implements your equation. I hope that it helps.

Brian Coalson

Software Engineer

National Instruments

Software Engineer

National Instruments

07-13-2007 03:10 AM

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Hello Sir,

Thanks for ur reply. But I could not view the attachment becz i am using LabVIEW8.0.

Thanks.

07-13-2007 05:21 PM

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Hi Sujeep,

Here is the VI that Brian wrote but for LabVIEW 8.0. I hope this helps.

Regards,

Michael

Applications Engineering

National Instruments

Michael

Applications Engineering

National Instruments