Top 12 Inductive Proximity Sensors

An inductive proximity sensor detects metal targets approaching the sensor without any physical contact with the target. They are classified into three different types- the magnetic type where it uses a magnet, a high-frequency oscillation type where it uses electromagnetic induction, and a capacitance type using the capacitance change.

Browse Best Inductive Proximity Sensors

Inductive Proximity Sensors Buying Guide

Inductive proximity sensors have some of the highest sales volumes. They include circuits that generate electromagnetic fields, and any metal part that approaches is easily detected as it becomes the seat of the currents and reduces oscillations. Inductive tools are used in textile industries, machine tools, assembly lines, automotive industries, and more. They are used to detect metal parts in very harsh environments and detect the quickly moving metal parts. This buying guide explains everything needed to know before someone purchases inductive proximity sensors, from the characteristics to the different kinds available.

Main characteristics of the sensors

The capacitive sensors have quite a few characteristics. These sensors can only be used for metal parts, have a relatively limited range of up to 80 mm, depending on the alloys’ natures, and have no moving parts subject to wear and tear. They are low-cost, robust, and resistant to harsh environments, vibrations, and not many sensitive impacts. The inductive proximity sensors have a high switching frequency that checks parts passing at high speeds or even rotations.

Features of Inductive Proximity Sensors

Because of high repeatability, the Inductive Proximity Sensors are suitable for accurate object positioning. They require no maintenance due to their non-contact output, ensuring a long life. They are made out of high-quality metals that provide excellent metal conductivity.

General Sensor

When an unknown or general target is approaching the magnetic field, an induction current flows through the subject in response to the electromagnetic induction. As the target keeps approaching the sensor, the current flow increases, causing the oscillation circuit’s load to rise. After that, the oscillation attenuates or stops. The sensor then finds this change with the amplitude detecting circuit and shows a detection signal.

The Nonferrous-metal Type

This metal is incorporated in the high-frequency oscillation type. It includes an oscillation circuit in which the induction current flows to the target, affecting the oscillation frequency change, resulting in an energy loss. When some nonferrous-metals like copper or aluminum come near the sensor, there is a decrease in the oscillation frequency. When the oscillation frequency is higher than the referencing frequency, the output is a detection signal.