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    Series DH Digihelic® Differential Pressure Controller

    Digihelic® Differential Pressure Controller
    3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow

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    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.

    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
    More Information
    Model Chart
    EXAMPLE DH 002 B Series DH-002-B Digihelic® Differential Pressure Controller, range 0.25" w.c., with barb fittings.
    SERIES DH     Digihelic® Differential Pressure Controller
    RANGE   002
    003
    004
    005
    006
    007
    008
    009
    010
    011
    012
    013
    014
    015
    016
    017    		   0.25" w.c.
    0.5" w.c.
    1" w.c.
    2.5" w.c.
    5" w.c.
    10" w.c.
    25" w.c.
    50" w.c.
    100" w.c.
    0.10-0-0.10" w.c.
    0.25-0-0.25" w.c.
    0.50-0-0.50" w.c.
    1.00-0-1.00" w.c.
    2.50-0-2.50" w.c.
    5.00-0-5.00" w.c.
    10.00-0-10.00" w.c.
    OPTIONS     B
    NIST    		 Barb Fittings
    NIST Certificate of Calibration
    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.
    • 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