Dwyer 2-5000-250PA Minihelic II Differential Pressure Gauge 0-250 Pa

• 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 and molded of tough acrylic.

• Aluminum scale litho-printed black on white, enhances readability.

• Red tipped aluminum pointer, rigidly mounted to helix is easy to see.

• Wishbone assembly provides mounting for helix, helix bearings, and pointer shaft.

• Jewel bearings provide virtually friction-free helix motion.

• Helix is free to rotate in jewel bearings. It 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 and at extremely low pressure. 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. Live length is adjustable for calibration. Small amplitude of motion minimizes inaccuracies and assures long life.

• 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 edgeof the diaphragm.

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