A three wire capacitive sensor uses two wires connected to the power source. What is the third wire connected to?

Prepare for the AEA Amatrol Sensor Logic Systems Test. Dive into interactive multiple-choice questions and quizzes, each with detailed explanations. Sharpen your skills and boost your confidence for your certification exam!

Multiple Choice

A three wire capacitive sensor uses two wires connected to the power source. What is the third wire connected to?

Explanation:
In a three-wire DC capacitive sensor, two wires provide the power supply (V+ and V−), and the third wire carries the output signal to the controller. The sensor’s internal output transistor switches this third wire to the appropriate level, so the PLC input terminal can read a high or low state. That’s why the third wire is connected to the controller input terminal—the input is the load that senses the sensor’s output. Shield isn’t used as the signal path, and ground is already one of the power wires.

In a three-wire DC capacitive sensor, two wires provide the power supply (V+ and V−), and the third wire carries the output signal to the controller. The sensor’s internal output transistor switches this third wire to the appropriate level, so the PLC input terminal can read a high or low state. That’s why the third wire is connected to the controller input terminal—the input is the load that senses the sensor’s output. Shield isn’t used as the signal path, and ground is already one of the power wires.

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