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Series A3000 Photohelic® Pressure Switch/Gage

Pressure switch/gage, range 15-0-15" w.c.


Item# A3330

In stock

Lead Time (If not in stock): 3 weeks
Pressure switch/gage, range 15-0-15" w.c. A3330 A3330
  • 3-in-1 instrument allows the reduction of several instruments with one product
  • Patented design and 1% full-scale dead band.
  • A wide range of pressure measurement specifications from low to very high

A3330 Model Options

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Pressure Range
Accuracy Value
Additional Features
Pressure Port Size
Accuracy Class
Alarm Type (DC/AC)

  • Accuracy ±2% of FS at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models.
  • Complaince CE
  • Electrical Connections Screw terminals. Use 167°F (75°C) copper conductors only.
  • Electrical Rating 10 A @ 28 VDC
  • Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations.
  • Power Requirements 120 VAC
  • Pressure Limits -20" Hg. to 25 psig (-0.677 to 1.72 bar). MP option
  • Process Connections 1/8" female NPT.
  • Repeatablity ±1% of FS.
  • Service Air and non-combustible
  • Set Point Adjustment Adjustable knobs on face.
  • Size 4" (101.6 mm) dial face
  • Switch Type Each setpoint has 2 Form C relays (DPDT).
  • Temperature Limits 20 to 120°F. (-6.67 to 48.9°C). -20 to 120°F (-28 to 48.9°C) with low temperature option.
  • Weight 4 lb (1.81 kg).
  • Wetted Materials Consult Factory

The Series A3000 Photohelic® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Photohelic® switch/gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Two phototransistor actuated, DPDT relays are included for low/high limit control. Easy to adjust set point indicators are controlled by knobs located on the gage face. Individual set point deadband is one pointer width - less than 1% of full scale. Set points can be interlocked to provide variable deadband - ideal for control of fans, dampers, etc. Gage reading is continuous and unaffected by switch operation, even during loss of electrical power. Choose from full scale pressure ranges from a low 0-.25 in (0-6 mm) w.c. up to 30 psi (21 bar).

Product Applications

  • Air Conditioning Systems
  • Clean Rooms
  • Fume Exhaust Systems
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