Glossary · Sensors and measurement
Inductive proximity sensor
Also known as: Inductive proximity switch
German: Induktiver Näherungssensor
In industrial automation, an inductive proximity sensor is a non-contact sensor that detects metal objects through the damping of a high-frequency alternating magnetic field generated at its sensing face.
- Sensors
- Standards
In one sentence
An inductive proximity sensor detects metal objects without contact through the damping of its high-frequency magnetic field.
Example
An inductive proximity sensor detects the cam on a rotary table and gives the PLC the home position of each station.
How it applies
- Engineering: The rated switching distance applies to a standard steel target. Other metals such as aluminum or brass reduce it by a correction factor, unless the sensor is designed for all metals. Flush and non-flush types have different mounting rules.
- Commissioning: Operate the sensor within its assured switching distance and check mechanical tolerances of the target.
- Safety: Standard inductive sensors are not interlocking devices. Position monitoring of guards for safety functions requires devices and circuits designed for it, for example per ISO 14119.
- Documentation: State target material, distance and whether the sensor is used for process or protective functions.
Inductive proximity sensor vs. limit switch
An inductive proximity sensor works without contact and wear. A Limit switch is actuated mechanically, which allows positive opening contacts and makes it common in safety applications.