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Magnetic field sensors are activated by magnetic fields and are especially suited for piston position detection in pneumatic cylinders. Based on the fact that magnetic fields can permeate non-magnetizable metals, it is possible to detect a permanent magnet attached to the piston through the aluminium wall of the cylinder. Magnetic-inductive permaprox sensors from TURCK operate on a patented function principle. Thus they are capable of reliably detecting permanent magnets of various field strengths on all common cylinder types. They operate completely wear-free and are short-circuit protected; a weld-field immune version for welding applications is also available.
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Pneumatic cylinders are typically made of aluminum, so sensors can indicate end-of-stroke from outside the tube. A magnet installed internally on the piston during manufacturing allows an external magnetic field sensor to detect the motion of the piston. The magnetic sensor can be placed anywhere along the length of the cylinder to read end-of-stroke.
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Linear Hall Sensors
All products of our linear hall family measure the vertical component of a magnetic field. The output signal is directly proportional to the sensed magnetic field.
Based on these principles, our TLE499x family of linear Hall ICs has been designed specifically to meet the requirements of highly accurate angular and linear position measurement, as well as current measurement applications.
The TLE499x product family comprises the linear Hall sensors TLE4990 and TLE4997 with analog output as well as the TLE4998 with three different digital output options. The TLE4998 interface options include Pulse Width Modulation (PWM), Single Edge Nibble Transmission (SENT) and Short PWM Codes (SPC). TLE4997 sensor provides unique temperature compensation which is further enhanced in the new TLE4998 sensor by unique compensation of stress over lifetime.
GMR-Based Angle Sensor
The TLE 5011 is a 360° angle sensor, which detects the orientation of a magnetic field. This is achieved by measuring sine and cosine angle components of a magnetic field with monolithic integrated Giant Magneto Resistance elements (iGMR). Data communication is accomplished via a bi-directional Synchronous Serial Communication (SSC) Interface that is SPI compatible.
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