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Inst Tools > Blog > Formulas > Formula for Process Variable to Percentage Conversion

Formula for Process Variable to Percentage Conversion

Last updated: April 21, 2019 12:52 pm
Editorial Staff
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Calculate the equivalent Percentage for any given Process variable. For conversion, we need transmitter Lower Range Value and Upper Range Value.

Contents
Process Variable to Percentage ConversionPercentage %  =   ((Process Variable – LRV)/Span)(100)

Process Variable to Percentage Conversion

Formula for Process Variable to Percentage Conversion

Formula:

Percentage %  =   ((Process Variable – LRV)/Span)(100)

Span = URV – LRV

Where

URV upper range value
LRV lower range value

Example: 

An electronic Pressure transmitter is ranged -1 to 5 Bar and has a 4-20 ma. Calculate the Percentage output by this transmitter if the measured Pressure is 1 Bar

Span = 5 – (-1) = 6

Percentage % = ((Process variable – LRV)/Span)(100)

Percentage % =((1-(-1))/6)(100)

Percentage % = 33.33 %

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6 Comments
  • Cameron White says:
    May 29, 2015 at 2:59 pm

    Thanks for sharing the formulas related to instrumentation.

    Reply
  • Shaju says:
    September 16, 2015 at 11:29 am

    Thanks for the information.

    Reply
  • Neeraj Sharma says:
    February 13, 2016 at 1:58 pm

    Thanks allot Sir

    Reply
  • mani says:
    May 11, 2016 at 7:01 am

    If conversion from MA to differential pressure any formula?????

    Reply
  • Hajee says:
    November 25, 2017 at 1:28 pm

    Its good

    Reply
  • Mohamed Razick says:
    April 16, 2018 at 3:19 pm

    thank you very much SIR

    Reply

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