# How to calculate measurement value from 4-20 ma transmitter output?

**URL:** <https://forumautomation.com/t/how-to-calculate-measurement-value-from-4-20-ma-transmitter-output/2254>\
**Category:** Instrumentation\
**Tags:** interviewquestions\
**Created:** [August 28, 2017, 3:18am UTC](https://forumautomation.com/t/how-to-calculate-measurement-value-from-4-20-ma-transmitter-output/2254 "2017-08-28T03:18:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [August 28, 2017, 3:18am UTC](https://forumautomation.com/t/how-to-calculate-measurement-value-from-4-20-ma-transmitter-output/2254/1 "2017-08-28T03:18:11Z")

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The equation to calculate **Measurement Value** is

MV = { [(TV - TRL) / (TRU - TRL)] \*(MRU-MRL)} + MRL

 ![](https://cdn.forumautomation.com/original/1X/849634578d5e846b4a262007ab5ca50969cfc90f.jpg)

MV = Measurement Value TRL = Transmitter range low value Eg:4 ma TRU = Transmitter range upper value Eg: 20 ma. TV = Transmission value MRL = Measurement range lower value. MRU = Measurement range upper value.

Calculate the measurement value of a 4-20 ma transmitter,the transmitter output is 18.826 ma. Measurement range of the transmitter is 0 deg C to 300 deg C?

MV = { [(18.826 - 4) / (20- 4)] \* (300-0) } + 0

Measurement Value = ( .926 \* 300) + 0 = 277 deg C