Dwyer Minihelic® II Differential Pressure Gauge

Minihelic® II Differential Pressure GaugeHousing is molded from strong mineral and glass filled nylonPointer stops of molded rubber prevent pointer over-travel without damageFull view lens is removablePrecision litho-printed scale is accurate and easy to readRed tipped pointer of heat treated aluminum tubing is easy to see"Wishbone" assembly provides mounting for helix, helix bearings and pointer shaftJewel bearings provide virtually friction-free motion for helixHelix is free to rotate in jewel bearings and aligns with magnetic field of magnet to transmit pressure indications to pointerZero adjustment screw, located behind the removable lens, eliminates tamperingRange spring calibration clamp fixes live length of spring for proper gauge calibration and is factory set and sealedSilicone rubber diaphragm allows accurate response to a broad range of temperatures at extremely low pressure and incorporates blow out area for overpressure protectionDiaphragm support plates of lightweight aluminum on each side of the diaphragm minimize position or attitude sensitivity and help define pressure areaFlat leaf range spring reacts to pressure on the diaphragmLow pressure tap connects to rear chamberCoil spring link provides a resilient connection between the diaphragm and the range springCeramic magnet mounted on a molded bracket at the end of the range spring rotates the helix without direct mechanical linkageHigh pressure tap connects with the front chamber through passageway in the plastic case and a sealing ring molded into the edge of the diaphragm