Proximity sensor

How it is used

Found on almost every machine, often just called a prox or prox switch. Engineers mention the sensing distance, the PNP or NPN output and the LED that lights when the sensor switches. It confirms parts, cylinder positions and machine home points.

Example sentences

1. The proximity sensor on the clamp is too far from the target, so it only switches now and then.

2. Use an inductive proximity sensor there; the part is steel.

Common collocations

• inductive proximity sensor
• sensing distance
• PNP output
• prox switch
• adjust the sensor

Related terms

• sensorA device that detects a physical quantity or an event, such as position, distance, force, temperature or the presence of a part, and turns it into a signal a controller can read.
• photoelectric sensorA sensor that uses a beam of light, usually infrared or red, to detect when an object is present, absent or passing. Common types are through-beam, retro-reflective and diffuse.
• limit switchA mechanical switch that is pressed by a moving part when it reaches a certain position, for example the end of its travel, and then sends an on/off signal.
• I/OShort for inputs and outputs: the signals a controller receives from sensors and buttons, and the signals it sends to valves, motors, lamps and other devices.
• fixtureA device that holds a part in an exact, repeatable position while a robot or machine works on it, for example during welding, machining or assembly.

More terms: Sensors, Motors and Actuators

• actuator
• servo motor
• encoder
• pneumatic cylinder
• stepper motor
• solenoid valve
• variable frequency drive