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Series AT3A3000 ATEX/IECEx Approved Photohelic Switch/Gauge

Brand: Dwyer Instruments, LLC
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Does not ship to Ohio, United States
Flame-proof ATEX/IECEx approved Series AT3A3000 Photohelic® Switch/Gauges, function as versatile, highly repeatable pressure switches combined with a precise pressure gauge employing the time-proven Magnehelic® gauge design.

The Photohelic® switch/ gauge 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 psig (2.4 bar) or 80 psig (5.5 bar). 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 gauge face (accessible opening case after de-energizing instrument). Set points can be interlocked to provide variable dead band– ideal for control of fans, dampers, etc.

Gauge reading is continuous and unaffected by switch operation, even during loss of electrical power.

Flame-proof enclosures are available in aluminum with glass window which allows for viewing of set point needles and process pressure.
Features
  • 3-in-1 ATEX approved instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
  • Flame-proof ATEX enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to process pressure and set point status
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Flame-proof ATEX/IECEx approved Series AT3A3000 Photohelic® Switch/Gauges, function as versatile, highly repeatable pressure switches combined with a precise pressure gauge employing the time-proven Magnehelic® gauge design.

The Photohelic® switch/ gauge 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 psig (2.4 bar) or 80 psig (5.5 bar). 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 gauge face (accessible opening case after de-energizing instrument). Set points can be interlocked to provide variable dead band– ideal for control of fans, dampers, etc.

Gauge reading is continuous and unaffected by switch operation, even during loss of electrical power.

Flame-proof enclosures are available in aluminum with glass window which allows for viewing of set point needles and process pressure.
Features
  • 3-in-1 ATEX approved instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
  • Flame-proof ATEX enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to process pressure and set point status
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Specifications

Brand

Accuracy

  • ± 2 % of Full Scale at 21.1° C (70° F)
  • ± 3 % on -0
  • ± 4 % on -00 Models

Adjustment Type

  • Adjustable Knobs on Photohelicc® Gage Face Behind Enclosure Cover

Approvals & Certifications

  • IECEx
  • ATEX

Electrical Connectors

  • 1/2” NPT Female
  • Screw Terminal

Electrical Rating

  • 10 A at 120/240 Vac
  • 10 A at 28 Vdc

Enclosure Finish

  • Texture Epoxy Coat RAL7038

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP66

Media

  • Air & Non-Combustible, Compatible Gases

NPT Connection

  • 1/8˝ Female NPT Brass (SS Optional)

Power Requirement

  • 120 Vac, 50/60 Hz
  • 240 Vac & 24 Vac optional

Repeatability

  • ± 1 % of Full Scale

Sensor Orientation

  • Diaphragm in Vertical Position

Set Point - Decreasing

  • Inches WC: 0 to 150

Set Point - Increasing

  • Inches WC: 0 to 150

Size

  • Dial: 4” (101.6 mm)

Switch Type

  • Each Set Point Has 2 Form C Relays (DPDT)

System Pressure

  • bar: 5.5
  • kPa: 550
  • psig: 80

Temperature Range

  • -6.7° to 48.9° C (20° to 120° F)
  • Case: -60° to 60° C (-76° to 140° F)
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Typical Applications

  • Hazardous Area Pressure Measurement and Switching
  • Air Conditioning Systems
  • Fume Exhaust Systems
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