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Measurement Reading to 4-20mA Signal Converter

Measurement Input Parameters
Unit [?]
Reading [?]
Low Limit [?]
High Limit [?]
Current Loop Signal (4-20mA)
Output Reading (mA) [?]

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✕ clear settings

Invert the low & high range limits for the measurement input settings



Flip tool with current settings to swap measurement input (I) with 4-20mA output parameters

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  • STT-26 Submersible Temperature Probe and Transmitter - Submersible 4-20mA output sensing probe for immersion in freshwater, seawater or any other compatible liquid to measure liquid temperature.
  • HART® Pressure Transmitters - Explore HART pressure transmitters utilizing digital communication over standard 4-20mA wiring for advanced diagnostics, remote configuration, and seamless DCS integration.

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Contents

Toggle
  • User Guide
    • Formula
    • Parameters
      • Measurement Unit
      • Measurement Reading
      • Lowest Measurement
      • Highest Measurement
      • Current Loop Signal (4-20mA) – Answer
  • Help
    • Calculator precision
    • Measurement types
    • Input & Output
    • Bidirectional measurements
    • Compound ranges
    • Elevated zero point
    • Measurement accuracy checking
    • 0-30,000 psi conversion
    • 0 bar over -1 to 3.5 bar conversion

User Guide

This measurement to current converter tool will convert any linear measurement reading into the ideal current loop signal over a linear range of 4 to 20 milliamps, and display a 4-20mA conversion scale for the chosen measurement range.

Formula

This tool uses the following formula to calculate the current output signal over a 4-20mA scale from a specified measurement input reading and range:

Linear mA out = 4 + (16 x ((Rdg – Low Limit) / (High Limit – Low Limit)))

Parameters

Measurement Unit

Add the measurement parameter value in the specified measurement unit you wish to convert.

Measurement Reading

Add the measurement parameter value you wish to convert in any units.

Lowest Measurement

Enter the lower limit for the measurement range to be converted. For example zero would be a typical value for most instrumentation but you can also add negative (-) or positive (+) values as well. Please enter the value in the same units as specified for all other input values.

Highest Measurement

Enter the upper limit for the measurement range to be converted, e.g. full scale or full range. This value can be negative (-) or positive (+). Please enter the value in the same units as specified for all other input values.

Current Loop Signal (4-20mA) – Answer

This is the ideal converted signal for the input measurement range specified, and represents the ideal output reading excluding all measurement and instrumentation errors.  The calculated result is displayed in milliamps (mA) based on a linear 4 to 20 mA scaling.

Featured 4 to 20ma signal products

  • Vacuum Pressure Transmitters - Choose vacuum pressure transmitters for measurements over the low vacuum range of 25 to 760 Torr, using a absolute or negative gauge reference vacuum range.
  • 10 bar g steam pressure transmitter, indicator and PNP switch - Steam pressure transmitter with LED display indicator for measuring 0 to 10 bars with in-built temperature reducer

Help

Calculator precision

How precise is the calculation from measurement to linear 4-20mA output?

The linear 4 to 20 milliamp signal Answer is displayed to a precision of 9 significant figures.

Measurement types

What type of measurement can I convert?

Any measurement which is linearly proportional to the 4-20mA signal can be converted, such as pressure, temperature, force, load, weight, position, movement, speed, rpm, depth, level, etc…

Input & Output

Does it matter if the measurement is an input or a output?

No it does not matter if the measurement, the calculation is the same whether it is an input or an output.

Bidirectional measurements

Can I convert a bidirectional measurement?

Yes, you can enter the lowest measurement as a negative value by prefixing it with a minus (-) sign.

Compound ranges

Can I enter a compound range?

Yes, any negative range can be specified in the Lowest text box can be combine with any positive range specified in the Highest text box.

Elevated zero point

Is it possible to convert a measurement range where the lowest value is offset in positive direction from zero?

Yes, the lowest measurement point can start from any value above zero.

Measurement accuracy checking

Can this converter help to determine the accuracy of measurement instrument?

Yes, this converter will calculate the ideal 4-20mA signal so that you can compare it to an observed 4-20mA reading.

0-30,000 psi conversion

What are the 4-20mA readings for a 0-30,000 psi range?

This conversion scale shows the pressure values against discreet milliamp values:

0 to 30000 psi to 4-20mA Conversion Scale

0 bar over -1 to 3.5 bar conversion

If a transmitter range is -1 to 3.5 bar, then what will be the mA reading at 0 bar?

At 0 bar it will be 7.5 mA for a linear 4-20mA output signal.

Minus 1-3pt5 to lin 4-20mA conversion

Featured 4 to 20ma signal products

  • DPT200 High One Side Overload Differential Pressure Sensor - DP transmitter for measuring pressure difference between two pressure points which can tolerate up a very high overload pressure independently on either the positive or negative side port or both together at the same time.
  • 4-20mA Output Pressure Sensors - Find reliable pressure sensors with 4-20mA current loop outputs. Designed for demanding industrial applications, offering excellent noise immunity and simplified 2-wire installation for process monitoring.

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Measurement Instrument Specifier

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Select your measurement instrument requirements

Wirelessly Measure & Log 4-20mA

Use this battery powered wireless 4-20mA wireless transmitter to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Use this battery powered 4-20mA wireless transmitter to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output
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