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Reading: Formula to Calculate 3-15psi from 4-20mA Current
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Inst Tools > Blog > Formulas > Formula to Calculate 3-15psi from 4-20mA Current

Formula to Calculate 3-15psi from 4-20mA Current

Last updated: August 7, 2019 2:36 pm
Editorial Staff
Formulas
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The amount of psi can also be calculated from the amount of the milliamp signal, or one can calculate the amount of the milliamp signal when the amount of psi is known. Each of these signals has an offset and a span that must be taken into account for the calculation.

The offset for the milliamp signal is 4 mA, and the span is 16 mA. The span is determined by subtracting the lower value from the higher value (20 mA – 4 mA). The offset for the psi signal is 3 psi, and the span is 12 psi (15 psi – 3 psi).

The formula for converting between these two systems is shown in the following equation. The milliamp signal is identified as “I” and the pressure signal is identified as “P”. When one is converting from one to the other, either “I” or “P” will become a known value in the formula.

The value 4 in the left side of the equation represents the 4 mA offset, and the value 16 represents the 16 mA span. The value 3 in the right side of the formula represents the pressure offset, and the value 12 represents the 12 psi span.

(I – 4)/16 = (P – 3)/12

The formula can be further simplified as shown in below figure

Formula for 4-20mA from 3-15PSI

Example:

Calculate the equivalent amount of air pressure for a current signal of 17.5mA ?

P = ((I – 4)/16) x (12) + 3

P = ((17.5 – 4)/16) x (12) + 3

P = 13.125 psi

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9 Comments
  • maqsood says:
    February 6, 2016 at 6:55 pm

    very nice and so easy for understood.

    Reply
  • sudhesh says:
    February 8, 2016 at 3:36 pm

    mai to mureed to gaya is side ka thanks to all

    Reply
  • moss says:
    August 22, 2016 at 6:10 pm

    hi, its easy to understand, thanks,,,..! i need one more help . if sensor outputs 4-20mA then controller takes in it and converts it to counts lets say 162 it displays. how can i convert to mA and then to pressure in bar please advice.

    Reply
    • S Bharadwaj Reddy says:
      August 23, 2016 at 7:14 am

      Hi, Please Click here to read the similar article which have the same numerical conversions.

      Reply
  • NISHIL PARMAR says:
    August 29, 2016 at 10:36 am

    Very nice and usefull app

    Reply
  • Noor Mustafa says:
    August 8, 2017 at 8:38 pm

    use full app

    Reply
  • sudhesh katare says:
    September 15, 2017 at 3:14 pm

    plz post the derivation of formula that how to calculate the formula

    Reply
    • S Bharadwaj Reddy says:
      September 15, 2017 at 3:48 pm

      Hi, Its already posted (similar), check old posts from “Formula” category

      Reply
  • Sarfraj alam says:
    August 7, 2019 at 2:55 pm

    Very good app

    Reply

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