A proximity sensor detects the approach of an object without making a contact. There are three types of proximity sensors :
Panasonic Industrial Devices SUNX proximity sensors are highfrequency oscillation type inductive proximity sensors.
The detection coil located at the front end of the sensor produces a high-frequency magnetic field as shown in the figure below. When an object (metallic) approaches this magnetic field, induced currents flow in the metal, causing thermal loss and resulting in the reduction or stopping of oscillations.
This change in state is detected by an oscillation state sensing circuit which then operates the output circuit.
Unlike a limit switch, it detects an object without any mechanical contact. Hence, there is no likelihood of the sensing object or the sensor getting damaged by contact.
Usable in severe environment
Reliable sensing is possible even in adverse conditions where it can come in contact with water, etc. Most of the sensors have IP67 protection and oil resistant construction.
It is suitable for precise object positioning because of its very high repeatability.
Short response time
Stable detection is possible even with fast traveling objects because of its high response frequency (3.3 kHz max.).
Due to its non-contact output, it has a long life and requires practically no maintenance.
Only metal detection
It cannot detect non-metals in which current cannot flow, since detection is based on thermal loss due to induced current.
Short sensing range
Although there are several methods for improving the sensing range, such as increasing the detection coil size, using non-shielded sensor heads, etc., the sensing range is still smaller than that of photoelectric sensors.
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