PRECISION Instruments, Valves & Manifolds

"The New Standard"

300 DGC

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Product Overview

300dgcThese quality differential pressure gauges are designed to measure the difference in pressure between two points in a system and show it on a single dial gauge. A magnetic movement senses the differential pressure. The gauge has separate pressure and indicating chambers. These diaphragm instruments can indicate small values of differential pressure even when used at high line pressures. They provide instantaneous and continuous information regarding system conditions helping in eliminating premature servicing of equipment, avoid unscheduled down time of costly processes and detect abnormal system conditions.

Switching Facilities

Gauges can be supplied with reed switches to initiate alarms, activate other equipment, or shut the system down. Two switches are used when high and low limits are desired. Gauge-switch models provide the user with both gauge readout and switch operation.

  • Cost effective and reliable.
  • Simple and compact design.
  • Easy to read dial gauge eliminates the accumulated errors of two gauge installations.
  • Working pressure up to 1500 Psig.
  • Range up to 60 Psid.
  • Adjustable reed contact switching.
  • Indicating mechanism isolated from pressure chamber.
  • Wide applications in air, gas and liquid media.
  • Zero migration between high and low pressures.
  • Non-indicating switch also available.

Operating Principles

High and Low pressures are separated by a sensor assembly consisting of a magnet, diaphragm, and a range spring. The difference in pressure causes the sensor assembly to move in proportion to the change against a range spring. A rotary magnet, located in a separate body cavity and isolated from the acting pressures, is rotated by magnetic coupling as per the linear movement of the sensor assembly. A pointer attached to the rotary magnet indicates differential pressure on the dial.

Switch: Reed switches are located adjacent to the pressure chamber and are activated by the magnetic field of the sensor assembly

Technical data
Ranges: 0-1 to 0-60 Psid, 0-30" to 0-1600" H₂O
Units of calibration: Kg/cm2, bar, mbar, mm H O, IN H O, psi, bar, flow scales. 2 2
Operating principle: Magnetic coupling with a convoluted diaphragm sensor.
Working pressure: 1500 psi
Accuracy: ± 2 % of FSD (Ascending)
Dial sizes: 2.5" (63 mm), 3.5" (80 mm), 4'' (100 mm), 4.5" (4.5"), & 6'' (150 mm)
Body Material: Aluminum, Brass & SS-316.
Temperature: 200°F Max. for the media. (Hi-Temp available upon request).
Protection: NEMA 4X/IP 65 for gauge
Migration of media: Zero migration between high and low pressures.
Connections: ¼" NPT female. (1/2" NPT female upon request).
Wetted parts: Diaphragm, ceramic magnet, SS 304 spring. Other internal parts in Aluminum, brass, or SS-316 as per the gauge body.
Seals: Buna N (Standard), Viton
Porting: In line (standard), Bottom or Back.
Switch: SPST or SPDT, one or two. Switches are field adjustable. The set points can be increased or decreased externally with simple screwdriver adjustments. When two switches are used, either can be be independently adjusted.
Dial case: Stainless steel case and flange
Window: Glass ( Standard ), Acrylic, shatterproof glass on request.
Other options: Glycerine filling, red resettable follower pointer, dual scale, DIN
  Plug, strainer in (+) connection.

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