square root function block

S

Thread Starter

srinivas

Hi,

I want to make a function block which mimics the Square root value of the DP transmitter.

Can any one tell me the formula to be implemented?

Regards,
Srinivas
 
N
If you are using DCS system, root extractor is a part of its library of functional blocks.
Else the simple formula shown below is the solution.

In 4-20 ma, its bias is 4ma and the span is 16 ma.
Iout = Sq.root of{((Iin -4)* 16)} + 4
For a 0% input, output is 0%
For a 25% Input, output is 50%
For 100% inout, ouput is 100%
 
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