Ram Position Sensors

Alliance Sensors Group launched the MR Series of linear position sensors for use in measuring the ram position of hydraulic and pneumatic cylinders. The MR Series is designed to be a drop-in form, fit, and function replacement for magnetostrictive sensors but with much more robust construction and a lower cost of ownership, specifically targeting port-mounted applications of industrial, mobile, or subsea hydraulic cylinders and large pneumatic actuators.

MR Series sensors are based on a patented contactless inductive sensing technology that employs a solid probe construction style that requires only a simple conductive tubular target or a small-diameter deep-hole gun drilled in the cylinder rod for operation rather than needing a permanent magnet ring or some other type of special target. Because these sensors use a simple coil design rather than “time-of-flight” technology, the MR Series sensors can withstand intense shocks and vibration as well as operating temperatures up to 85C for standard products and 125C for custom units. Resembling a magnetostrictive sensor with its sensor head and male o-ring port threads, an MR sensor has a shorter stroke-to-probe length ratio and can thread into the same o-ring bosses (either SAE J1926-8 or ISO 6149-1 M18) that accept a magnetostrictive sensor. (

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