1. What is 4-20 mA output
4-20 mA is a standard analog current signal widely used in industrial instruments, such as level meters, flow meters, pressure transmitters, etc.
4 mA represents the 0% lower range value
20 mA represents the 100% upper range value
2. Advantages of 4-20 mA
Strong anti-interference ability, suitable for long-distance transmission
Less affected by cable resistance and voltage drop
Easy to detect wire breakage (signal < 4 mA means fault)
Compatible with most PLCs, DCS, recorders and control systems
Stable and reliable in harsh industrial environments
3. Typical applications
Transmit measured values (level, flow, pressure, temperature)
Connect to control systems for monitoring and control
Used in various industrial field instruments
Suitable for oil, water treatment, chemical, power and other industries
Post time: Mar-17-2026