Patent ID: 6605940
Filing Date: 2003-08-12
Classification: G01D,H01F

Abstract:
A linear variable differential transformer (LVDT) assembly with nulling adjustment comprising:a housing defining a pressure barrier between first and second zones; a thin-walled tube sealed to said housing and having a central section and an outer end extending into said second zone; an LVDT multiple coil assembly extending around the central section of said tube; said coil assembly being longitudinally movable on said tube; a magnetic member mounted on a mechanical linkage extending into said tube within the coils of said LVDT multiple coil assembly; a fixed support extending around said tube near the outer end thereof; said coil assembly including a threaded member extending through said fixed support; a spring providing a force biasing said coil assembly toward said housing from said fixed support; and an adjusting nut on the other side of said fixed support from said housing, said adjusting nut engaging said threaded member, and said adjusting nut bearing on said fixed support as a result of the biasing force of said spring; whereby the null position of the LVDT assembly may be adjusted by rotating said adjusting nut to shift the position of said LVDT coil assembly, without disassembling said tube from said housing.