The giant magneto resistance (GMR) effect is Nobel Prize winning science. Now, engineers are starting to use it in various devices. One example is the SITRANS VP300 intelligent positioner, which incorporates the 2007 Nobel Prize winning GMR. The giant magneto resistance technology is used for non-contact position sensing of a linear or rotary valve shaft. Incorporating this technology in the positioner eliminates any mechanical wear or complex interaction of couplings and levers between these components. The positioner only requires one magnet for strokes up to 150 mm (5.9 in.) or rotary angles up to 120 degrees.
“Traditional non-contacting technology allows for less wear and maintenance, but at the risk of reduced accuracy. With GMR technology, the positioner is less sensitive to vibration, offering both accuracy and less wear,” said Ron Salerno, manager for Process Instrumentation, Siemens Industry. The valve positioner also features SIL-certified partial stroke testing (PST).
The vibration-resistant positioner features an aluminum housing with IP66/NEMA 4X protection. Suitable for -40 to +85° C applications, it operates in damp air that may be contaminated with oil or particles.
Siemens Industry, Inc.
Filed Under: Couplings, Fluid power, Linear motion • slides, Sensors (position + other), Test + measurement • test equipment, Valves