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Inductive sensors

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Inductive sensors

Inductive sensors , also known as limit sensors, are used to detect the presence of metal objects, positioning metal actuators of machines or components. They also detect exceeding the set position by the tested object. They enable non-contact detection of the position of metal objects . Inductive sensors are perhaps the most common type of proximity sensor in the industry. They are characterized by high efficiency and reliability. They react to all metals. Thanks to the high degree of protection IP67, the sensors can operate in difficult conditions, and have high resistance to environmental influences . They are insensitive to contamination and also resistant to dust and water.

Inductive sensors - construction

An inductive sensor consists of a stylus, coil turns, ferromagnetic core and housing. The advantage is no moving parts in the construction of the sensor. The main sensing element of the inductive sensor is the coil. By forcing the current to flow through the coil, we induce an electromagnetic field around it. The electromagnetic field affects metal objects in front of the sensor in its working area. Changes in this field are detected by the sensor electronics. The size of these changes depends on the distance of the object from the sensor. The output signal is activated when the element is brought closer to the appropriate distance.

Inductive sensors are usually made in the shape of oval, metal and threaded elements. The cylindrical housing facilitates assembly. Many sensors have LEDs fitted to show the current state of the sensor.

The principle of operation of an inductive sensor

Inductive sensors work by changing the measurement value depending on the position and movement of the element in its field of operation. An alternating magnetic field is generated in the oscillator circuit of the proximity switch, which is emitted at the active surface. This field has a high frequency. If a metallic conductive element is introduced into them, then the interaction takes place, which allows the built-in electronics to recognize changes and estimate.

A metal element located in the signal emission field receives some of the energy of this field, and this fact evaluates and analyzes the sensor electronics. Ferromagnetic metals such as nickel, cobalt or steel absorb the highest doses of energy, therefore the greatest recognition (switching) distance is obtained for them. Aluminum is also very conductive. This non-ferrous metal absorbs less energy, which results in significantly shorter switching distances. Due to this principle of operation, inductive sensors are characterized by high speed of operation.

Areas of application of inductive sensors

Inductive sensors are most often used in the automation sector of production lines. They are used for the detection of moving machine parts, cams, presence / quality control of production (e.g. aluminum lids, screw caps or bottle caps). They are used to position elements of machine parts, measure or control the thickness of sheet metal or aluminum foil, measure speed or acceleration in drives. They are used wherever no direct contact with the detected object

is required

There are also inductive sensors on the market designed to operate in extreme environments, in potentially explosive atmospheres, with increased resistance to temperatures. They are also short circuit proof and resistant to specific chemicals and pressure washing. These are all-steel inductive sensors, resistant to high pressure (500 bar continuous, 1000 bar peak) and extremely tight, sensors for operation at temperatures up to 230 ° C. The simplicity of use inductive sensors allows them to be installed in critical places of automatic lines.