Proximity switches are typically used as signal transmitters and can be used in a variety of manipulation processes to ensure that the risk scale or other important manipulation functions are exerted.
Most of the proximity switches are inductive and photoelectric proximity switches, and some are proximity switches that use ultrasonic waves or capacitors. Although each proximity switch works differently and operates on a different scale, all proximity switches have at least one thing in common: they are all touchless. This makes the proximity switch wear-free in practice and largely unaffected by environmental failures or damage.
Because the different proximity sensors are based on a variety of different functional principles, it is possible to find the right solution for different tasks.
Inductive proximity switches
Inductive proximity switches. The sensor is completely encapsulated in a corrosion-resistant metal casing made of V2A or V4A special steel. They are suitable for use in the automotive industry, shipbuilding, the food industry, as well as in machine tools. The picture shows that when the base of the fountain is equipped with a miniature sensor-type proximity switch, the operating distance is only 0.6 or 1.0 mm
A relatively inexpensive inductive proximity switch that can be used to explore all conductive metal guidelines. They are fastened and used, are not sensitive to pollution, and are simple to operate. The early inductive proximity switches were introduced around the early 60s of the 20th century and quickly spread to the market, opening up a wide range of applications since then.
The inductive proximity sensor has undergone many technical improvements, but it still has some shortcomings, such as the relatively small operating interval in terms of scale proportion, which has been changed due to the special oscillation principle. Contrinex now offers wide-plate inductive proximity switches that can operate at 3 to 4 times the standard operating distance.
A typical example is the Condet proximity switch, which has a three-fold increase in operating distance, not only for steel, but also for other non-ferrous metals such as brass or aluminum. The structure of the Condet proximity switch is similar to that of a transformer, which is different from the general inductive proximity switch method that uses the attenuation of a certain vibration circuit.
The Condet proximity switch has a coil behind the useful area, which announces a very short current pulse, and when this pulse is disconnected, the guide becomes the primary winding, sensing a voltage into the coil on the instrument side, which is then processed. The operating distances achieved in this way are 3 (M8, flush mounted) – 40 mm (M30, non-flush mounted).
The inductive proximity sensor is encapsulated in a corrosion-resistant metal shell made of V2A or V4A special steel, which is mainly used in the automotive industry. However, the same applies to the shipbuilding industry, the food industry and machine tools.
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