Combination differential and static pressure switch

A combination differential and static pressure switch for detecting a differential pressure condition occurring in a test system, comprising:

• a first tubular-shaped member closed at a first end and having an elongated cavity extending substantially therethrough from an annular seat at the closed first end to an open annular second end;
• a second tubular-shaped member axially aligned with and adapted for removable securement to the first tubular-shaped member;
• the second tubular-shaped member further characterized by having a substantially closed distal end, an elongated passage extending from the distal end substantially into the second tubular-shaped member concentric thereto, an annular rim having a smaller diameter than the second tubular-shaped member and projecting axially from the second tubular-shaped member opposite the distal end, the annular rim adapted to slidably fit within the open annular second end of the first tubular-shaped member, and a cylindrical chamber located between the elongated passage and the annular rim;
• a pre-set piston positioned within the second tubular-shaped member and disposed for slidable axial movement therein, the pre-set piston capable of registering a minimum predetermined static pressure within the test system;
• a differential piston having a face end and an opposite seating end slidably disposed within the inner bore and axially aligned with the pre-set piston, the differential piston detecting a differential pressure occurring within the test system;
• a magnet mounted to the face end of the differential piston for producing a local magnetic field;
• a cylindrical, elongated support member for removable and adjustable placement within the elongated passage of the second tubular-shaped member projecting into the cylindrical chamber and encompassed by the pre-set piston;
• an electrical signaling means emplaced within the elongated support member actuated by the proximity of the magnetic field to a conducting and signaling on state;
• and
• the electrical signaling means further disposed to a nonsignaling, nonconducting off state when the magnetic field moves away from the electrical signaling means.