High resolution linear position sensors replace magnetostrictive and potentiometer devices in industrial automation.
Turck’s new LI-Q25 series linear position sensors replace magnetostrictive and potentiometer devices to deliver precise, repeatable measurements in metal processing machines, rolling mills or injection moulding machines. Unlike magnetostrictive or magnetic inductive position sensors, LI-Q25 sensors do not require a magnetic positioning device; thus, they are unaffected by metal debris. The sensors provide up to 1 μm resolution and can achieve measuring ranges between 100 and 1000 mm with analogue voltage/current, SSI or I/O Link outputs.
The linear sensor has emitter and receiver coil systems, precisely placed on a printed circuit board and excited with high frequency AC to produce an inductive RLC circuit with the positioning element (resonator). As a result, the resonator is inductively coupled to the receiver coils, which are arranged in a pattern so that different voltages are induced depending on the position of the resonator. These voltages serve as a measure for the sensor signal.
To increase the speed and accuracy of measurement, the sensor has a course and a fine measuring coil system that is microprocessor controlled. An integrated processor provides an output signal in different formats: 0–10 V, 4–20 mA, IO-Link or SSI.
The linear position sensor has a wide operating temperature range from -25 to 70°C and the option to program for different measuring ranges.
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