Series AT-DH3 Approved Digihelic® Differential Pressure Controller

Digihelic® Pressure Control in Flameproof ATEX/IECEx Enclosure

The Series AT-DH3 ATEX/IECEx Approved 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 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 4-20 mA process output. In velocity or flow modes, a square root output is provided on the 4-20 mA signal to coincide with the actual flow curve. Flameproof enclosures are available in aluminum and can include a glass window for viewing process information and set point status on the digital display.

Important notes for installation:
• Cables must be fitted through 1/2" NPT cable gland or ATEX/IECEx conduit (not supplied with instrument).
• Make sure after cabling to close tight cover and cable gland, in order to maintain IP66 rating.
• 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/IECEx approved.

California Residents:  Click Here for Proposition 65 WARNING.

Product Applications

  • Hazardous area pressure measurement and transmitter

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

COVID-19 Update: Due to high customer demand, lead time on some products may be up to two weeks. While this is a developing health situation, we are working continuously to take the necessary measures to ensure that the products you need are available with minimal interruption.

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Specifications

Service:
Air and non-combustible, compatible gases.
Wetted Materials:
Consult factory.
DH3 Housing Material:
Die cast aluminum case and bezel.
Housing Material:
Aluminum.
Finishing:
Texture epoxy coat RAL7038.
Accuracy:
±1.5% for 0.25 in w.c. and ±0.25 in w.c ranges. Ranges 0.5 in w.c. to 5 in w.c. and corresponding bi-directional (except ±2.5 in w.c.) ±1%; all other ranges: ±0.5% @ 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).
Stability:
< ±1% per year.
Pressure Limits:
See pressure limit chart.
Temperature Limits:
32 to 140°F (0 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); For 0.25 in and ±0.25 in w.c. ranges: ±0.03%/°F (±0.054%/°C).
Power Requirements:
12-28 VDC, 12-28 VAC 50 to 400 Hz.
Power Consumption:
3 VA max.
Output Signal:
4-20 mA DC into 900 Ω max.
Zero and Span Adjustments:
Accessible via menus in safe zone only.
Response Time:
250 ms (damping set to 1). Without considering delay caused by Exd flame arrestors (up to 30 s from FS to zero depending model and ranges with STD pressure ports) about 15 s with LD pressure ports on very low ranges.
Display:
Backlit 4-digit LCD 0.4" height LED indicators for set point and alarm status.
Process Connections:
1/8" NPT female brass (SS optional).
Electrical Connections:
Two 1/2" NPT female. Cable gland not included.
Electrical Wiring:
Screw terminal.
Mounting Orientation:
Mount unit in vertical plane.
Enclosure Rating:
IP66.
Dial Size:
5" (127 mm) OD x 3-1/8" (79.38 mm).
Weight:
12.3 lb (5.6 kg).
ATEX Certificate:
EPT 19 ATEX 3192 X.
Agency Approvals:
ATEX Compliant: CE 0477 EX II 2G Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) II 2D Ex tb IIIC T75 °C Db IECEx Compliant: Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) Ex tb IIIC T75°C Db.

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

  • Saves inventory, installation time, and money by consolidating several instruments into one ATEX/IECEx approved product
  • Flameproof 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

Model Chart

     SERIES AT-DH3 SERIES PRESSURE CONTROLLER       
     
     AT-102NA-DH3-X-XXXX  AT-DH3 PR CNTRLR W/ ATEX ENCLOSURE
  
          1ST SYMBOL (1ST X) RANGE
             002   0 - 0.25 IN WC (0-62.2 PA)
             003   0 - 0.50 IN WC (0-124.5 PA)
             004   0 - 1.0 IN WC (0-249.1 PA)
             005   0 - 2.5 IN WC (0-622.7 PA)
             006   0 - 5.0 IN WC (0-1245 PA)
             007   0 - 10.0 IN WC (0-2491 PA)
             009   0 - 25 IN WC (0-6227 PA)
             010   0 - 50 IN WC (0-12.45 KPA)
             011   0 - 100 IN WC (0-24.91 KPA)
             013   0.25 - 0 - 0.25 IN WC (62.2 - 0 - 62.2 PA)
             014   0.5 - 0 - 0.5 IN WC (124.5 - 0 - 124.5 PA)
             015   1 - 0 - 1 IN WC (249.1 - 0 - 249.1 PA)
             016   2.5 - 0 - 2.5 IN WC (622.7 - 0 - 622.7 PA)
             017   5 - 0 - 5 IN WC (1245 - 0 - 1245 PA)
             018   10 - 0 - 10 IN WC (1249 - 0 - 1249 PA)
  
          2ND SYMBOL (2ND X) COVER
             B     BLIND
             W     GLASS WINDOW
  
          3RD SYMBOL (3RD X) PRESSURE PORT/VALVE MATERIAL
             1     BRASS
             2     STAINLESS STEEL
  
          4TH SYMBOL (4TH X) PRESSURE PORT/VENTING VALVE
             VS0   STD PRESSURE PORT 1/8” FEMALE NPT/NO VENTING VALVE
             VL0   LD PRESSURE PORT 1/8” FEMALE NPT/NO VENTING VALVE
             VS1   STD PRESSURE PORT 1/8” FEMALE NPT/STD VENTING VALVE
             VS2   STD PRESSURE PORT 1/8” FEMALE NPT/LD VENTING VALVE
             VL1   LD PRESSURE PORT 1/8” FEMALE NPT/LD VENTING VALVE

          4TH SYMBOL (4TH X) CABLE ENTRY
             12    1/2" NPT ANSI/ASME B1.20.1

Product Literature

Manuals

Catalog Pages

Approvals

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