Details
Minihelic® II Differential Pressure Gauge
- Housing is molded from strong mineral and glass filled nylon
- Pointer stops of molded rubber prevent pointer over-travel without damage
- Full view lens is removable
- Precision litho-printed scale is accurate and easy to read
- Red tipped pointer of heat treated aluminum tubing is easy to see
- "Wishbone" assembly provides mounting for helix, helix bearings and pointer shaft
- Jewel bearings provide virtually friction-free motion for helix
- Helix is free to rotate in jewel bearings and aligns with magnetic field of magnet to transmit pressure indications to pointer
- Zero adjustment screw, located behind the removable lens, eliminates tampering
- Range spring calibration clamp fixes live length of spring for proper gauge calibration and is factory set and sealed
- Silicone rubber diaphragm allows accurate response to a broad range of temperatures at extremely low pressure and incorporates blow out area for overpressure protection
- Diaphragm support plates of lightweight aluminum on each side of the diaphragm minimize position or attitude sensitivity and help define pressure area
- Flat leaf range spring reacts to pressure on the diaphragm
- Low pressure tap connects to rear chamber
- Coil spring link provides a resilient connection between the diaphragm and the range spring
- Ceramic magnet mounted on a molded bracket at the end of the range spring rotates the helix without direct mechanical linkage
- High pressure tap connects with the front chamber through passageway in the plastic case and a sealing ring molded into the edge of the diaphragm