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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 h

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 paralleling 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.

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In a gauge that includes linear to rotary motion transforming means including a housing, a helix in the housing journaled for rotation about its axis, with the helix having an indicator connected thereto, a magnet in the housing for producing rotational movement of said helix in response to linear m

In a gauge that includes linear to rotary motion transforming means including a housing, a helix in the housing journaled for rotation about its axis, with the helix having an indicator connected thereto, a magnet in the housing for producing rotational movement of said helix in response to linear movement of the magnet alongside the axis of the helix, said magnet being mounted on a leaf spring member secured within the housing cantilever fashion at one end of said spring member, with said spring member being disposed to extend generally transversely of the axis of said helix and with said helix aligned with said spring member, said magnet being mounted on said leaf spring member adjacent to and in magnetic attraction relation to said helix, sensing means connected to said spring member to shift said magnet substantially parallel to the axis of said helix and comprising a flexible diaphragm mounted across a pressure cavity formed by the housing and separating high and low pressure chambers in the gauge, and an adjustment device for adjusting the spring rate of said spring member, the improvement wherein: the housing between the diaphragm and the spring member defines a rim wall in circumambient relation about the cavity, and including a mounting plate secured in said housing within said rim wall and contacting the housing only at said rim wall, said leaf spring member being mounted on said mounting plate at said one end of said spring member and the magnet being adjacent the other end of said spring member, a fulcrum for said spring member engaging said spring member intermediate said ends of said spring member and mounted on said mounting plate for adjustment longitudinally of said spring member, and means for moving said fulcrum longitudinally of said spring member.