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Series DH Digihelic Differential Pressure Controller
Brand: Dwyer Instruments, LLCThe 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
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