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Series AT2DH3 ATEX/IECEx Approved DH3 Differential Pressure Controller
Brand: Dwyer Instruments, LLCThe ATEX/IECEx approved Series AT2DH3 Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output.
Combining these three features allows the reduction of several instruments with one product, saving inventory, installation time and money.
The ATEX/IECEx approved Digihelic® controller is the ideal instrument for hazardous area pressure, velocity and flow applications by allowing for the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units.
Two SPDT control relays with adjustable dead bands are provided along with a scalable 4 to 20 mA process output.
In velocity or flow modes, a square root output is provided on the 4 to 20 mA signal to coincide with the actual flow curve. Flame-proof enclosures are available in aluminum and can include a glass window for viewing process information and set point status on digital display.
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
1 - 12 of 120 Part Numbers
AT2DH3-002-AB1OPVT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Blind
- Process Connection - 1/8” Female NPT Brass Port
- Overpressure Plug - Overpressure Relief Valve
AT2DH3-002-AB1XT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Blind
- Process Connection - 1/8” Female NPT Brass Port
- Overpressure Plug - None Required
AT2DH3-002-AB2OPVT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Blind
- Process Connection - 1/8” Female NPT Stainless Steel Port
- Overpressure Plug - Overpressure Relief Valve
AT2DH3-002-AB2XT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Blind
- Process Connection - 1/8” Female NPT Stainless Steel Port
- Overpressure Plug - None Required
AT2DH3-002-AO1OPVT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Glass Top Cover
- Process Connection - 1/8” Female NPT Brass Port
- Overpressure Plug - Overpressure Relief Valve
AT2DH3-002-AO1XT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Glass Top Cover
- Process Connection - 1/8” Female NPT Brass Port
- Overpressure Plug - None Required
AT2DH3-002-AO2OPVT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Glass Top Cover
- Process Connection - 1/8” Female NPT Stainless Steel Port
- Overpressure Plug - Overpressure Relief Valve
AT2DH3-002-AO2XT2
- Pressure Range - Inches WC: 0 to 0.25
- Cover - Glass Top Cover
- Process Connection - 1/8” Female NPT Stainless Steel Port
- Overpressure Plug - None Required
AT2DH3-003-AB1OPVT2
- Pressure Range - Inches WC: 0 to 0.5
- Cover - Blind
- Process Connection - 1/8” Female NPT Brass Port
- Overpressure Plug - Overpressure Relief Valve
AT2DH3-003-AB1XT2
- Pressure Range - Inches WC: 0 to 0.5
- Cover - Blind
- Process Connection - 1/8” Female NPT Brass Port
- Overpressure Plug - None Required
AT2DH3-003-AB2OPVT2
- Pressure Range - Inches WC: 0 to 0.5
- Cover - Blind
- Process Connection - 1/8” Female NPT Stainless Steel Port
- Overpressure Plug - Overpressure Relief Valve
AT2DH3-003-AB2XT2
- Pressure Range - Inches WC: 0 to 0.5
- Cover - Blind
- Process Connection - 1/8” Female NPT Stainless Steel Port
- Overpressure Plug - None Required
1 - 12 of 120 Part Numbers
Specifications
Brand
Accuracy
- ± 0.5 % at 25° C (77° F) Including Hysteresis & Repeatability, (After 1-Hour Warm-Up)
Adjustment Type
- Adjustable Via Keypad on Face in Safe Zone Only
Approvals & Certifications
- IECEx
- ATEX
Compensated Temperature
- 0° to 60° C (32° to 140° F)
Consumption
- 3 VA, Max.
Cover Material
- Blind Glass Top Cover
Display
- Backlit 4-Digit LCD 0.4” Height LED Indicators for Set Point & Alarm Status
Electrical Connectors
- 1/2” NPT Female (Cable Gland Not Included)
- Screw Terminal
Electrical Rating
- 1 A at 30 Vdc/Vac
Enclosure Finish
- Texture Epoxy Coat RAL7038
Enclosure, Body Material
- Aluminum
- Die Cast Aluminum Case & Bezel
Environmental Protection
- IP65
Media
- Air & Non-Combustible Compatible Gases
NPT Connection
- 1/8” NPT Female
Output
- 4-20 mA DC Into 900 ohms, Max.
Power Requirement
- 12-28 Vac, 50/400 Hz
Response Time
- 250 milliseconds (Damping Set to 1)
Sensor Orientation
- Mount Unit in Vertical Plane
Set Point - Decreasing
- Inches WC: 0 to 100
Set Point - Increasing
- Inches WC: 0 to 100
Size
- Dial: 5” (127 mm) O.D. x 3-1/8” (79.38 mm)
Span & Zero Adjustments
- Accessible Via Menus in Safe Zone Only
Stability
- < ± 1 % Per Year
Switch Type
- 2 SPDT Relays
Temperature Range
- -60° to 60° C (-76° to 140° F)
Thermal Drift
- 0.036/°C (0.020 %/°F) from 25° C (77° F)
- Hazardous Area Pressure Measurement and Switching