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    1. Archive

    Linear position sensors - Turck Inc.

    Nov. 4, 2010
    The LI-Q25 Series linear position sensors replace magnetostrictive and potentiometer devices
    Denise Greco

    The LI-Q25 Series linear position sensors replace magnetostrictive and potentiometer devices for repeatable measurements in metal-processing machines, rolling mills, or injection-molding machines. The sensors do not require a magnetic-positioning device so they are unaffected by metal debris. The sensors provide up to 1-µm resolution and can measure in ranges between 100 and 1,000 mm with analog voltage/current, SSI, or I/O Link outputs.

    The sensing mechanism consists of emitter and receiver coil systems, arranged on a printed-circuit board, that are activated with a high-frequency ac field and produce an inductive RLC circuit with the positioning element (resonator). The resonator inductively couples to the receiver coils. Depending on the resonator’s position, different voltages are induced in the coils and serve as a measure for the sensor signal.

    To increase the speed and accuracy of measurement, the sensors have both a coarse and fine measuring-coil system that is microprocessor controlled. An integrated processor provides output signals in 0 to 10 V, 4 to 20 mA, IO-Link, or SSI. The sensors also feature 29-mm blind zones on each side and a –25 to 70°C operating range.

    Turck Inc., 3000 Campus Dr., Plymouth MN 55441, (800) 544-7769, www.turck.us

    © 2010 Penton Media, Inc.

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