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. | Dwyer Instruments
Documents and manuals
Dwyer Instruments DH-004 Documents
Overview
Details for DH-004
Series DH Digihelic® Differential Pressure Controller
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
- 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
- Series
- DH Digihelic® Differential Pressure Controller
- Category/Type
- Pressure
- Type
- Differential Pressure
- Series
- DH Digihelic® Differential Pressure Controller
- 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 132to 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.
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