DWYER – Series DH Digihelic® Differential Pressure Controller

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Description

Series DH Digihelic® Differential Pressure Controller

3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow

The Series DH Digihelic® Differential Pressure Controller is a 3 in 1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output. The Digihelic® controller is the ideal instrument for pressure, velocity and flow applications, achieving a 0.5% full scale accuracy on ranges from 0.25 to 100 in. w.c.

The Digihelic® controller allows 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 of flow modes, a square root output is provided on the 4-20 mA signal to coincide with the actual flow curve. The Series DH provides extreme flexibility in power usage by allowing 120/220 VAC and also 24 VDC power which is often used in control panels.

Programming is easy using the menu key to access 5 simplified menus which provide access to: security level; selection of pressure, velocity or flow operation; selection of engineering units; K-factor for use with flow sensors; rectangular or circular duct for inputting area in flow applications; set point control or set point and alarm operation; alarm operation as a high, low or high/low alarm; automatic or manual alarm reset; alarm delay; view peak and valley process readings; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your application’s range; Modbus® communications; and field calibration. With all this packed into one product it is easy to see why the Digihelic® controller is the only instrument you will need for all your pressure applications.

NIST CALIBRATION available in Product Configurator.

 

Product Applications

  • SCFM duct flow
  • Industrial ovens air flow
  • Filter status
  • Clean room pressurization
  • Fume hood air flow
  • Surgical and medical room pressurization
  • Damper and fan control

 

Specifications

Service: Air and non-combustible, compatible gases.

  • Wetted Materials: Consult factory.
  • Housing Material: ABS plastic, UL approved 94 V-0.
  • Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability.
  • Stability: < ±1% per year.
  • Pressure Limits: Ranges ≤ 2.5 in w.c. = 2 psi; 5″: 5 psi; 10″: 5 psi; 25″: 5 psi; 50″: 5 psi, 100″: 9 psi.
  • Temperature Limits: 32 to 140°F (0 to 60°C).
  • 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: High voltage power = 100 to 240 VAC, 50 to 400 Hz or 132 to 240 VDC. Low voltage power = 24 VDC ±20%.
  • Power Consumption: Low voltage power = 24 VDC – 130 mA max; High voltage power = 100 to 240 VAC, 132 to 240 VDC – 7VA max.
  • Output Signal: 4-20 mA DC into 900 Ω max.
  • Zero & Span Adjustments: Accessible via menus.
  • Response Time: 250 ms.
  • Display: 4 digit LCD 0.4″ height. LED indicators for set point and alarm status.
  • Electrical Connections: Screw terminals.
  • Process Connections: Compression fitting for use with 1/8″ ID X 1/4″ OD tubing (3.175 mm ID x 6.35 mm OD). Optional barbed fitting for 3/16″ ID tubing.
  • Enclosure Rating: Face designed to meet NEMA 4X (IP66).
  • Mounting Orientation: Mount unit in horizontal plane.
  • Size: 1/8 DIN.
  • Panel Cutout: 1.772 x 3.620 in (45 x 92 mm).
  • Weight: 14.4 oz (408 g).
  • Serial Communications: Modbus® RTU, RS485, 9600 Baud.
  • Agency Approvals: CE, UL.
  • SWITCH SPECIFICATIONS
  • Switch Type: 2 SPDT relays.
  • Electrical Rating: 8 amps at 240 VAC resistive.
  • Set Point Adjustment: Adjustable via keypad on face.

 

Features

  • 3-in-1 instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
  • Velocity of flow modes, a square root output coincides with the actual flow curve for greater precision
  • Power usage of 120/220 VAC or 24 VDC provides flexibility to incorporate device in control panel
  • Secure menu program provides access to device operation only for the right skill level
  • Modbus® communications supports Process and HVAC system integration and control

 

Models & Ordering

 

Standard Ranges

Model Description
DH-002 Differential pressure controller, selectable engineering units: .2500″ w.c., 6.350 mm w.c., 0.635 cm w.c., 0.467 mm Hg, 0.623 mbar, 62.28 Pa, 0.623 hPa, 0.114 oz/in².
DH-004 Differential pressure controller, selectable engineering units: 1.000″ w.c., 25.40 mm w.c., 1.868 mm Hg, 2.491 mbar, 249.1 Pa, 0.249 kPa, 2.491 hPa, 0.578 oz/in².
DH-006 Differential pressure controller, selectable engineering units: 5.000″ w.c., .4167 ft w.c., 127.0 mm w.c., 12.70 cm w.c., .1806 psi, .3678″ Hg, 9.342 mm Hg, 12.45 mbar, 1245 Pa, 1.245 kPa, 12.45 hPa, 2.890 oz/in².
DH-007 Differential pressure controller, selectable engineering units: 10.00″ w.c., .8333 ft w.c., 254.0 mm w.c., 25.40 cm w.c., .3613 psi, .7356″ Hg, 18.68 mm Hg, 24.91 mbar, 2491 Pa, 2.491 kPa, 24.91 hPa, 5.780 oz/in².
DH-008 Differential pressure controller, selectable engineering units: 25.00″ w.c., 2.083 ft w.c., 635.0 mm w.c., 63.50 cm w.c., .9032 psi, 1.839″ Hg, 46.71 mm Hg, 62.27 mbar, 6227 Pa, 6.227 kPa, 62.27 hPa, 14.45 oz/in².
DH-009 Differential pressure controller, selectable engineering units: 50.00″ w.c., 4.167 ft w.c., 1270 mm w.c., 127.0 cm w.c., 1.806 psi, 3.678″ Hg, 93.42 mm Hg, 124.5 mbar, 12.45 kPa, 124.5 hPa, 28.90 oz/in². NOTE: velocity & volumetric flow not available.
DH-010 Differential pressure controller, selectable engineering units: 100.0″ w.c., 8.333 ft w.c., 2540 mm w.c., 254.0 cm w.c., 3.613 psi, 7.356″ Hg, 186.8 mm Hg, 249.1 mbar, 24.91 kPa, 249.1 hPa, 57.80 oz/in². NOTE: velocity & volumetric flow not available.

 

Bi-Directional Ranges

Model Description
DH-012 Differential pressure controller, range 0.25-0-0.25″ w.c. NOTE: velocity & volumetric flow not available.
DH-014 Differential pressure controller, range 1.0-0-1.0″ w.c. NOTE: velocity & volumetric flow not available.
DH-015 Differential pressure controller, range 2.5-0-2.5″ w.c. NOTE: velocity & volumetric flow not available.
DH-016 Differential pressure controller, range 5-0-5″ w.c. NOTE: velocity & volumetric flow not available.
DH-017 Differential pressure controller, range 10-0-10″ w.c. NOTE: velocity & volumetric flow not available.

 

 

 

Additional information

Model

DH-002, DH-004, DH-006, DH-007, DH-008, DH-009, DH-010, DH-012, DH-014, DH-015, DH-016, DH-017

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