Images are representations only.
Series AT3A3000 ATEX/IECEx Approved Photohelic Switch/Gauge
Brand: Dwyer Instruments, LLCFlame-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
Specifications
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)
- Hazardous Area Pressure Measurement and Switching
- Air Conditioning Systems
- Fume Exhaust Systems