What is 4-20 mA signal

Question

Accepted Answer

4-20 mA signal is a current loop signal commonly used in industrial instrumentation to transmit analog signals.

4-20 mA signal is a type of analog signal used for transmitting process variables such as temperature, pressure, level, etc.
The signal represents the measured value as a current ranging from 4 mA to 20 mA.
The 4 mA represents the lowest value or zero scale, while 20 mA represents the highest value or full scale.
The signal is typically used because it is less susceptible to noise and can travel long distances without significant loss.
It is commonly used in industries like manufacturing, oil and gas, chemical plants, etc.
Example: A temperature sensor may output a 4-20 mA signal where 4 mA represents the lowest temperature and 20 mA represents the highest temperature.
The receiving instrument can convert the current back to the corresponding process variable for monitoring or control purposes.

Accepted Answer

This is an analog current signal.

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