DIFFERENTIAL PRESSURE GAUGE

摘要

DIFFERENTIAL PRESSURE GAUGE A differential pressure gauge of the type comprising a controlling magnetic helix device carrying a pressure indicating arm, the position of which is controlled by a magnet mounted on the free end of a cantilevered leaf spring actuated by a pressure diaphragm exposed to differential pressures. The helix cooperates with a magnet having a planar pole face parallel the axis of the helix and defining a magnetic axis that is normal to and intersects the helix axis. The gauge housing defines an integral one piece pressure wall that separates the helix from the magnet and defines within the gauge housing pressure cavity an operating space within which the magnet and its supporting leaf spring are mounted and operate. Between the helix and the magnet the pressure wall is of film dimensions and is contoured to stress in bending. The leaf spring is mounted on a mounting plate disposed within the pressure cavity and engaging the gauge housing only at its rim for stress isolation purposes. The mounting plate also shiftably mounts an adjustable fulcrum for the leaf spring in the form of a clamp device which may be both positionally adjusted and operated through a common access opening in the housing. The housing includes a zero datum and a device for setting the indicating arm on the zero datum including an adjustment mechanism coupled to the helix and seated on the housing in alignment with the helix axis.