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. (http://www.alliancesensors.com)