Inductive Sensor
There are four types of sensors: inductive, capacitive, ultrasonic, and photoelectric.
nductive sensors: use an electromagnetic field to detect the presence of metal objects.
Capacitive sensors: use an electrostatic field to detect the presence of any object.
Ultrasonic sensors: use sound waves to detect the presence of objects.
Photoelectric sensors: react on changes in the received quantity of light. Some photoelectric sensors can even detect a specific color.
Photoelectric sensors: react on changes in the received quantity of light. Some photoelectric sensors can even detect a specific color.
Inductive Sensor is
electromagnetic coil which is used to detect the presence of a
conductive metal object. The sensor will ignore the presence of an
object if it is not metal.
Inductive Sensors
are operated using an Eddy Current Killed Oscillator (ECKO) principle.
This type of sensor consists of four elements: coil, oscillator, trigger
circuit, and an output. The oscillator is an inductive capacitive tuned
circuit that creates a radio frequency. The electromagnetic field
produced by the oscillator is emitted from the coil away from the face
of the sensor. The circuit has just enough feedback from the field to keep the oscillator going.
When a metal target enters the field, eddy currents circulate within the target. This causes a load on the sensor, decreasing the amplitude of the electromagnetic field. As the target approaches the sensor the eddy currents increase, increasing the load on the oscillator and further decreasing the amplitude of the field. The trigger circuit monitors the oscillator’s amplitude and at a predetermined level switches the output state of the sensor from its normal condition (on or off). As the target moves away from the sensor, the oscillator’s amplitude increases. At a predetermined level the trigger switches the output state of the sensor back to its normal condition (on or off).
this sensor has three wire (V+/V-/NO or NC contact) . we specified two type of inductive sensors (npn or pnp) for example, the PNP output is off when the target is absent then it is a normally open device. If the PNP output is on when the target is absent it is a normally closed device.
When a metal target enters the field, eddy currents circulate within the target. This causes a load on the sensor, decreasing the amplitude of the electromagnetic field. As the target approaches the sensor the eddy currents increase, increasing the load on the oscillator and further decreasing the amplitude of the field. The trigger circuit monitors the oscillator’s amplitude and at a predetermined level switches the output state of the sensor from its normal condition (on or off). As the target moves away from the sensor, the oscillator’s amplitude increases. At a predetermined level the trigger switches the output state of the sensor back to its normal condition (on or off).
this sensor has three wire (V+/V-/NO or NC contact) . we specified two type of inductive sensors (npn or pnp) for example, the PNP output is off when the target is absent then it is a normally open device. If the PNP output is on when the target is absent it is a normally closed device.
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