4-20 mA to Engineering Units Converter
In industrial automation, most transmitters output 4–20 mA analog signals representing process variables like pressure, temperature, flow, or level.
To interpret these readings accurately, we must convert the measured current into engineering units. This 4-20 mA to Engineering Units Converter quickly calculates the actual process value from your measured current. Ideal for instrument technicians, engineers, and maintenance teams working with sensors and transmitters in the field.
Signal to Measurement Calculator
Enter Measured Current (mA): Actual transmitter signal, typically between 4 mA and 20 mA.
Enter Lower Range Value (LRV): The process value that corresponds to 4 mA.
Enter Upper Range Value (URV): The process value that corresponds to 20 mA.
Click Convert to instantly get the actual process variable in engineering units.
🧭 How to Use
FAQ
Q1. What does 4–20 mA mean?
A. It’s a standard analog signal where 4 mA represents the minimum process value and 20 mA the maximum. Used for transmitting sensor readings in industrial systems.
Q2. Why start from 4 mA instead of 0 mA?
A. The 4 mA “live zero” allows detection of open circuit faults — a reading below 4 mA indicates wiring or transmitter issues.
Q3. Can this calculator be used for voltage (1–5 V) signals?
A. Yes. The same linear formula applies — simply adjust for 1–5 V instead of 4–20 mA.
Q4. What types of transmitters use 4–20 mA?
A. Pressure, temperature, level, flow, and many other industrial sensors use 4–20 mA outputs to ensure accurate, noise-resistant transmission.