4–20 mA Formula Made Simple!

4–20 mA Formula Made Simple!

Understanding 4–20 mA calculations is one of the most important skills for every Instrumentation & Automation Engineer.

In this infographic, you’ll learn:

% Span calculation

mA output from Process Value (PV)

PV calculation from mA signal

Quick checks for 0%, 50% & 100% signals

These formulas are widely used during:

Calibration

Loop checking

PLC/DCS troubleshooting

Commissioning activities

Quick Reminder:

4 mA = 0%

12 mA = 50%

20 mA = 100%

Save this post for future reference and share it with fellow engineers.