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| Go to Inductive Store Page | ||||||
| Inductive Proximity Sensor Control Technology |
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| The inductive sensor’s circuit consists of a coil of copper wire wrapped on a ferrite core and a transistorized circuit. A small amount of energy is supplied to the coil and the transistorized circuit uses this coil to produce an oscillation. The inductive sensors operate on a “kill oscillator” principle. When the conductive material (metals) are brought into the Radio Frequency field, eddy current losses draw energy from the coil to run along the surface of the metal (skin effect). Since there is little energy in the coil, the amplitude of the oscillation decreases as more of the target metal enters the field. When enough metal enters the field, the losses become so great that the circuit is unable to keep the oscillator running. When the oscillation is killed, a detector produces an output signal that is used to operate a relay or to switch another electronic circuit.
Since the signal is Radio Frequency, ferrous metal is not attracted to the sensor head. These new generation proximity sensors resemble their ancestors mostly in the operating principal only. With the development of stable integrated circuits, the oscillator driver and amplifier can now be located in the detector head itself. This removes the troublesome shielded cable from the circuit and drastically improves the detector’s noise immunity. The only wire used with the detector is now the power supply and a low impedance output signal that does not have to be shielded since it is not in the detectors circuit. |
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 Inductive Switch Block Diagram |
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| Applications for Inductive Proximity Sensors | ||||||
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| Broken Tool Detection |
Cam Follower | Part & Product Detection |
Bottle Cap Detection |
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Inductive Proximity Sensors are ideal for detecting broken drill bits, tooling or other moving parts that can otherwise go unnoticed and slow down production. |
The high switching speed of our inductive sensors allows you to monitor any variation in cam or gear rotation speed. |
Inductive Sensors can be used for detecting any metal part or product to allow for perfect positioning in filling, labelling or batch counting applications |
Use Inductive Sensors to ensure quality control in packaged or bottled food and drink production. |
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| We specialize in the supply of inductive proximity sensors, capacitive level sensors and photoelectric sensors with a wide range of specialty sensors such as our LongRange, MetalHead and Weld Field Immune Sensors with SpatterGuard technology. We also carry Safety Light Curtains, Non-contact Thermometers, cables and distribution boxes. |
| For general questions or comments, please contact our corporate headquarters via e-mail, PHONE (800-644-1756) or FAX (888-283-2127) HTM electronics industries Copyright © 2007 [HTM]. All rights reserved. Specifications subject to change without notice |