v1.00 (AI Audited, 29/7/2025). Confirm suitability before use.
About 4-20 mA Current Loops
The 4-20 mA current loop is an industry standard for transmitting sensor information in many industrial processes. This robust signal is less susceptible to electrical noise and allows for longer wire runs in industrial environments.
This calculator converts between temperature values and their corresponding 4-20 mA current signals based on the specified temperature range.
Temperature Range Settings
Set the minimum and maximum temperature values for your 4-20 mA loop:
Temperature to Current
Calculate the current output for a specific temperature value.
Current to Temperature
Calculate the temperature value from a specific current reading.
Technical Information
Conversion Formulas
Temperature to Current:
I = 4mA + 16mA × (T - Tmin) / (Tmax - Tmin)
Current to Temperature:
T = Tmin + ((I - 4mA) / 16mA) × (Tmax - Tmin)
Advantages of 4-20 mA
- Live zero (4 mA) allows for fault detection
- Less susceptible to electrical noise than voltage signals
- Allows for longer wire runs
- Industry standard compatible with most control systems
- Power can be supplied over the same two wires (loop-powered devices)
Common Applications
- Temperature transmitters and controllers
- Pressure transmitters
- Level transmitters
- Flow meters
- Analytical instruments (pH, conductivity, etc.)