Dwyer Digihelic Differential Pressure Controller, Series DH
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Series DH Digihelic Differential Pressure Controller

Brand: Dwyer Instruments, LLC
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The Series DH Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gauge, 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 inches WC. 

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. 

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.
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

View Details

Specifications

Brand

Accuracy

  • ± 0.5 % at 25° C (77° F) Including Hysteresis & Repeatability,

Adjustment Type

  • Adjustable Via Keypad on Face

Approvals & Certifications

  • CE
  • UL

Compensated Temperature

  • 0° to 60° C (32° to 140° F)

Consumption

  • 132-240 Vdc, 7 VA, Max.
  • High Voltage Power: 100-240 Vac
  • Low Voltage Power: 24 Vdc - 130 mA - Max.

Display

  • 4-Digit LCD 0.4” Height LED Indicators for Set Point & Alarm Status

Electrical Connectors

  • Screw Terminals

Electrical Rating

  • 8 A at 240 Vac Resistive

Enclosure, Body Material

  • ABS Plastic, UL Approved 94 V-0

Environmental Protection

  • IP66
  • NEMA 4X

Media

  • Air & Non-Combustible, Compatible Gases

Mounting

  • 1/8” DIN

Output

  • 4-20 mA DC Into 900 ohms, Max.

Power Requirement

  • 50-400 Hz or 132-240 Vdc
  • High Voltage Power: 100-240 Vac
  • Low Voltage Power: 24 Vdc ± 20 %

Response Time

  • 250 milliseconds

Sensor Orientation

  • Mount Unit in Horizontal Plane

Set Point - Decreasing

  • Centimeters WC: 0.635 to 254
  • Feet WC: 0.417 to 8.33
  • hPa: 0.623 to 249.1
  • Inches Hg: 0.368 to 7.356
  • Inches WC: 0.25 to 100
  • kPa: 0.249 to 24.91
  • mbar: 0.623 to 249.1
  • Millimeters Hg: 0.467 to 186.8
  • Millimeters WC: 6.35 to 2,540
  • oz./in²: 0.144 to 57.80
  • Pa: 62.28 to 6,227
  • psi: 0.181 to 3.613

Set Point - Increasing

  • Centimeters WC: 0.635 to 254
  • Feet WC: 0.417 to 8.33
  • hPa: 0.623 to 249.1
  • Inches Hg: 0.368 to 7.356
  • Inches WC: 0.25 to 100
  • kPa: 0.249 to 24.91
  • mbar: 0.623 to 249.1
  • Millimeters Hg: 0.467 to 186.8
  • Millimeters WC: 6.35 to 2,540
  • oz./in²: 0.144 to 57.80
  • Pa: 62.28 to 6,227
  • psi: 0.181 to 3.613

Span & Zero Adjustments

  • Accessible Via Menus

Stability

  • < ± 1 % Per Year

Switch Type

  • 2 SPDT Relays

Temperature Range

  • 0° to 60° C (32° to 140° F)

Thermal Drift

  • 0.036/°C (0.020 %/°F) from 25° C (77° F)

Tube Connection

  • 1/8” I.D. x 1/4” O.D. Tubing (3.175 mm I.D. x 6.35 mm O.D.)

  • 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

Documentation

Approvals

Catalogs

Manuals

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