Dwyer 2-5040 Minihelic II Differential Pressure Gauge 0-40 Inch w.c.

Dwyer 2-5040 Minihelic II Differential Pressure Gauge 0-40 Inch w.c.

  • Model: 2-5040
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  • Combining High Accuracy, Compactness, Dependability, and Low Cost. Offers the latest in design features for a dial type differential pressure gage.


  • 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.


Service: Air and compatible gases.

Wetted Materials: Consult factory.

Housing: Glass filled nylon; acrylic lens.

Accuracy: ±5% of full scale at 70°F (21.1°C).

Pressure Limits: 30 psig (2.067 bar) continuous to either pressure connection.

Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).

Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.

Process Connections: Barbed, for 3/16″ I.D. tubing (standard); 1/8″ male NPT (optional).

Weight: 6 oz (170.1g).


Dwyer 2-5040 Specifications
Service Air and compatible gases
Housing Glass filled nylon
polycarbonate lens
Accuracy ±5% of FS at 70°F (21.1°C)
Pressure Limits 30 psig (2.067 bar) continuous to either pressure connection
Temperature Limits 20 to 120°F (-6.67 to 48.9°C)
Mounting Orientation Diaphragm in vertical position
Process Connections Barbed, for 316” ID tubing (standard)
⅛” male NPT (optional)
Weight 6 oz (170.1 g)
Agency Approvals Meets the technical requirements of EU Directive 2011/65/EU (RoHS II)