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An alternative to linear pots


A new, non-contacting sensor for stroke ranges from 0-4 to 0-50 in. was recently introduced by Macro Sensors, Pennsauken, N. J. The LP750 series of linear displacement transducers offers a high stroke-to-length ratio, making it compact and wellsuited to long stroke applications. With the ability to be almost the same length as the stroke, the LP750 series opens new possibilities in using this sensor technology in place of potentiometers in a wide range of industrial position measurement applications such as hydraulic cylinder position feedback in mobile and stationary equipment, machine tool positioning, valve position sensing, and automatic assembly equipment.

Units also operate reliably and accurately while buried in oil and under water pressure. A low operating frequency allows the signal process to be remotely located in applications of high temperature and radiation. With remote electronics, the linear position sensor can operate up to 500° F.

Offering frictionless position feedback similar to the potentiometer, the LP750 sensors have no parts to wear out, offering unlimited cycle life and greater performance than a pot. Units incorporate a digitally enhanced analog output that enables a compact design much reduced in size in comparison to an LVDT. Microprocessor electronics also provide better unit-to-unit consistency and non-linearity.

LP 750 sensors are available in standard measurement ranges from 3.75 to 24 in. (95 to 600 mm) and offered in three outputs:
• 5 Vdc input, 0.5 to 4.5 Vdc output,
• pre-calibrated, loop-powered 4-20 mA input and output, or
• 24Vdc input with 0-10 Vdc output.

The low voltage (5Vdc), power regulated input works with microcontroller based systems and allows signal processing electronics to be located remotely, away from hostile environments.

For more information, e-mail position [email protected] or visit