What is a 4-20 mA output?

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. The current (mA) is measured on the loop by reading the voltage across a known value resistor (often called a sense resistor).

How far can analog signals travel?

Analog Current Signals (0-20mA, 4-20 mA): Typical industrial position sensors with an analog current interface can tolerate significantly longer cable lengths compared to comparable voltage interfaces. Again making a somewhat broad generalization, analog current signals can tolerate cable lengths up to 500 feet*.

What is 4-20mA loop output signal?

4 to 20 mA Current Loop Output Signal 4-20mA Current loop output is a type of electrical signal that is used in a series circuit to provide a robust measurement signal.

What is the difference between two-wire and four-wire 4-20mA transmitters?

Two wire 4-20mA transmitter will have a single loop circuit with the transmitter [+/-], power supply [+/-] and signal conditioning unit (SCU) [+/-] all connected together in series. Four wire 4-20mA transmitter will have a separate output and supply circuit.  The transmitter output +/- will be connected to the SCU +/-.

Why do we use 4Ma instead of 20mA in a circuit?

The main reason is that 4-20mA is normally a 2 wire current loop and in order for the device to operate it needs to consume some of the current to function, and this is provided by the minimum current of 4mA. 4 to 20 mA current loop signal measurement products. Analog Output Pressure Gauges.

What is the output voltage of a digital signal generator?

The versatile generator can be widely used as signal generator, value generator, value adjustment, inverter control, PLC debugging, panel debugging, LED testing, simulating the output of transimitter. Display accuracy: Current: 0.1mA; Voltage: 0.01V