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 molding 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 1,000 mm with analog voltage/current, SSI or I/O Link outputs.
The linear position sensor has emitter and receiver coil systems, precisely placed onto a printed circuit board, that are activated with a high frequency AC field and produce an inductive RLC circuit with the positioning element (resonator). As a result, the resonator is inductively coupled with the receiver coils. The receiver coils are arranged in a pattern so that different voltages are induced into the coils 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 to 10 V, 4 to 20 mA, IO-Link or SSI.
The linear position sensor has extremely short blind zones of only 29 mm on each side, along with a wide temperature range of -25 to 70°C, and the option to program the sensor for different measuring ranges.