4-20mA Output Pressure | Temperature | Level Sensors
The 4-20mA output signal is an analog output signal commonly used in sensors. It is typically powered by DC voltage ranging from 8-32 VDC, which are widely available commercially.
Occasionally, 4-20mA output signals use a three wire configuration (+V, -V, +S), but the vast majority of modern 4-20mA output sensors employ a two-wire, loop powered configuration with a supply (+V) and ground (-V). The current (mA) is measured on the loop by reading the voltage across a known value resistor (often called a sense resistor).
Nearly all industrial level products from Core Sensors offer 4-20mA output options.
- Output Signal
- 4-20mA two wire, loop-powered
- Excitation Voltage
- 10-28VDC (for excitation as low as 8.5VDC, please contact factory)
- Available from Core?
- Yes
4-20mA Sensor Wiring Schematic
Advantages
- Noise Immunity
- No signal loss over long transmission distances
- Compatibility with various power supplies and PLC’s because of high usage in general industry
Disadvantages
- Current consumption is high when compared to a voltage output sensor
- Need for at least 8VDC excitation, making for limited battery-powered options