Siemens Industry's Sitrans VP300
Sitrans VP300 incorporates the 2007 Nobel Prize-winning GMR effect. This “giant magnetoresistance” technology is used for non-contact position sensing of a linear or rotary valve shaft. This eliminates any mechanical wear or complex interaction of couplings and levers between these components. Sitrans VP300 requires only one magnet for strokes up to 150 mm (5.9 in.) or rotary angles up to 120º. It also features SIL-certified, partial-stroke testing (PST).