Series AT2DH3 ATEX Approved DH3 Differential Pressure Controller

3 in 1 Instrument: Gage, Switch, and Transmitter, Flame-Proof ATEX Enclosure

The ATEX 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 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 ATEX enclosures are available in aluminum and can include a glass window for viewing process information and set point status on digital display.

Important notes for installation:
• Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument).
• Make sure after cabling to close tight cover and cable gland, in order to keep IP66 rating (IP65 with option OPV, overpressure relief valve).
• Open cover only after de-energizing instrument.
• Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.

Please see SERIES DH3 for non-ATEX approved.

California Residents:  Click Here for Proposition 65 WARNING.

Product Applications

  • Hazardous area pressure measurement and switching

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

Service:
Air and non-combustible, compatible gases.
Wetted Materials:
Consult factory.
Housing Material:
Die cast aluminum case and bezel.
Accuracy:
< 5 in w.c. (except ±2.5 in w.c.): ±1%; All other ranges: ±0.5% at 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).
Stability:
< ±1% per year.
Pressure Limits:
Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5", 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in w.c.: 9 psi.
Temperature Limits:
32 to 140°F (0 to 60°C) Case: -76 to 140°F (-60 to 60°C) (Note: Product temperature limits differ from case).
Compensated Temperature Limits:
32 to 140°F (0 to 60°C).
Thermal Effects:
0.020%/°F (0.036/°C) from 77°F (25°C).
Power Requirements:
12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.
Power Consumption:
3 VA max.
Output Signal:
4 to 20 mA DC into 900 Ω max.
Zero & Span Adjustments:
Accessible via menus in safe zone only.
Response Time:
250 ms (damping set to 1).
Display:
Backlit 4 digit LCD 0.4" height LED indicators for set point and alarm status.
Electrical Wiring:
Screw terminal.
Mounting Orientation:
Mount unit in vertical plane.
Dial Size:
5" (127 mm) OD x 3-1/8" (79.38 mm).
Enclosure Rating:
(IP66). IP65 with option OPV, overpressure relief valve.
Housing Material:
Aluminum.
Finishing:
Texture epoxy coat RAL7038.
Pressure Connections:
1/8" NPT female brass (SS optional). In presence of acetylene it is necessary to use SS.
Electrical Connections:
Two 1/2" FNPT. Cable gland not included.
Weight:
12.3 lb (5.6 kg).
ATEX Approved Products from Comhas with ECN:
BVI 14ATEX0072.
Agency Approvals:
CE 1370 II2 GD Ex d IIC Gb T6; -60°C ≤ Ta ≤ +60°C Ex tb IIIC Db T 85°C.
SWITCH SPECIFICATIONS
Switch Type:
2 SPDT relays.
Electrical Rating:
1 A @ 30 VAC/VDC.
Set Point Adjustment:
Adjustable via keypad on face in safe zone only.

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

Videos

Model Chart

EXAMPLE  AT2DH3 002 A 1 X T2 Series AT2DH3-002-AB1XT2  Pressure Gage with ATEX Enclosure, range 0.25" wc, Aluminum housing material, Blind Top Cover, 1/8" npt female brass pressure port, Standard Plug without Overpressure Relief Valve, Stainless Steel Tag
SERIES  AT2DH3             Pressure Gage with ATEX Enclosure
RANGE  

002
003
004
005
006
007
009
010
011
013
014
015
016
017
018

         

0.25" w.c.
0.5" w.c.
1" w.c.
2.5" w.c.
5" w.c.
10" w.c.
25" w.c.
50" w.c.
100" w.c.
-0.25 +/- 0.25" w.c.
-0.50 +/- 0.50" w.c.
-1.00 +/- 1.00" w.c.
-2.50 +/- 2.50" w.c.
-5.00 +/- 5.00" w.c.
-10.0 +/- 10.0" w.c.

HOUSING MATERIAL     A        

Aluminum

COVER       B
O
      Blind Top Cover
Glass Top Cover
PRESSURE CONNECTION         1
2
    1/8" npt femal Brass Pressure Port
1/8" npt femal Stainless Steel Port
OVERPRESSURE PLUG           X
OPV
  Standard without Overpressure Relief Valve
Overpressure Relief Valve Material, same as Port
TAG             T2  Stainless Steel Tag

 

Product Literature

Manuals

Catalog Pages

Approvals

Drawings

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