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Inductive Proximity Sensors

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About Inductive Proximity Sensors

Inductive proximity sensors are noncontact proximity devices that set up a radio frequency field with an oscillator and a coil. The presence of an object alters this field and the sensor is able to detect this alteration. An inductive proximity sensor comprises an LC oscillating circuit, a signal evaluator, and a switching amplifier.  The coil of this oscillating circuit generates a high-frequency electromagnetic alternating field. This field is emitted at the sensing face of the sensor. If a metallic object (switching trigger) nears the sensing face, eddy currents are generated. The resultant losses draw energy from the oscillating circuit and reduce the oscillations. The signal evaluator behind the LC oscillating circuit converts this information into a clear signal.  The measurement of proximity, position and displacement of objects is essential in many different applications: valve position, level detection, process control, machine control, security, etc.

The body style of inductive proximity sensors can be barrel, limit switch, rectangular, slot, or ring.  A barrel body style is cylindrical in shape, typically threaded.  A limit switch body style is similar in appearance to a contact limit switch. The sensor is separated from the switching mechanism and provides a limit of travel detection signal.  A rectangular or block body style is a one piece rectangular or block shaped sensor.  A slot style body is designed to detect the presence of a vane or tab as it passes through a sensing slot, or "U" channel.  A ring shaped body style is a "doughnut" shaped sensor, where the object passes through center of ring.  Electrical connections for inductive proximity sensors can be fixed cable, connector(s), and terminals.  A fixed cable is an integral part of sensor and often includes "bare" stripped leads.  A sensor with connectors has an integral connector for attaching into an existing system.  A sensor with terminals has the ability to screw or clamp down. 

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Products & Services Related to Inductive Proximity Sensors

Capacitive Proximity Sensors
Capacitive proximity sensors detect the presence or proximity of a target using capacitive technology.
Eddy Current Proximity Sensors
Eddy current proximity sensors and switches detect the proximity or presence of a target by sensing the magnetic fields generated by a reference coil.
Hall Effect Position Sensors
Hall effect position sensors are non-contact devices that convert energy from a magnetic field into an electrical signal. They use the Hall effect, a voltage caused by current-flow in the presence of a magnetic field.
Hall Effect Proximity Sensors
Hall effect proximity sensors are used to detect the proximity, presence or absence of a magnetic object using a critical distance.
Magnetoresistive Linear Position Sensors and Switches
Magnetoresistive linear position sensors and switches have a linear resistance output signal representing the distance an object is from a reference point.
Photoelectric Sensors
Photoelectric sensors use emitters and receivers to detect the presence, absence, or distance of target objects.
Ultrasonic Proximity Sensors
Ultrasonic proximity sensors use reflected or transmitted ultrasonic waves to detect the presence or absence of a target component.

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Part Numbers for Inductive Proximity Sensors

Part # Distributor Manufacturer Product Category Description
F92A-C5 Digi-Key Omron Electronics Inc-IA Div Sensors, Transducers COUPLER INDUCTIVE M18 5MM DIST
E2EX1R5E2N Digi-Key Omron Electronics Inc-IA Div Sensors, Transducers SENSOR PROXIMITY INDUCTIVE NC
F92A-C-2 Digi-Key Omron Electronics Inc-IA Div Sensors, Transducers COUPLER INDUCTIVE M18 5MM DIST
E2E-X1R5E2-M1 Digi-Key Omron Electronics Inc-IA Div Sensors, Transducers SENSOR INDUCTIVE M8 SPST-NC
TCA505B CHIP Digi-Key Infineon Technologies Sensors, Transducers IC INDUCTIVE PROX SWITCH CHIP

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