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    Series DH3 Digihelic® Differential Pressure Controller

    Digihelic® 3 Differential Pressure Controller
    Digihelic® Controller in Photohelic® Gage, Square Root Output for Flow

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    Series DH3 Digihelic® Differential Pressure Controller

    Digihelic® Controller in Photohelic® Gage, Square Root Output for Flow

    The SERIES DH3 Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output all packed in the popular Photohelic® gage style housing. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time and money. The Digihelic® controller is the ideal instrument for pressure, velocity and flow applications, achieving a 1% full scale accuracy on ranges down to the extremely low 0.25" w.c. to 2.5" w.c. full scale. Ranges of 5" w.c. and greater maintain 0.5% F.S. accuracy. Bi-directional ranges are also available.

    The Series DH3 Digihelic® controller allows the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. 2 SPDT control relays with adjustable deadbands are provided along with a scalable 4-20 mA process output.

    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 reading; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your applications range and field calibration.

    Please see SERIES AT2DH3 for ATEX approved.

    Product Applications

    • SCFM flow in ducts
    • Filter status
    • Static pressures in ducts or buildings
    • Damper control
    • Fan control
    More Information
    Model Chart
    EXAMPLE DH3 002 AT Series DH3-002-AT Digihelic® Differential Pressure Controller, range 0.25" w.c., with aluminum tag.
    SERIES DH3     Digihelic® Differential Pressure Controller
    RANGE   002
    003
    004
    005
    006
    007
    009
    010
    011
    013
    014
    015
    016
    017
    018    		   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.
    0.25-0-0.25" w.c.
    0.5-0-0.5" w.c.
    1-0-1" w.c.
    2.5-0-2.5" w.c.
    5-0-5" w.c.
    10-0-10" w.c.
    OPTIONS     AT
    COO
    NIST
    ST    		 Aluminum Tag
    Certificate of Origin
    NIST Certificate of Calibration
    Stainless Steel Tag
    Service: Air and non-combustible, compatible gases.
    Wetted Materials: Consult factory.
    Housing Material: Die cast aluminum case and bezel.
    Accuracy: ±1.5% for 0.25" and ±0.25" w.c. ranges. Ranges 0.5" to 5" w.c. and corresponding bi-directional (except ±2.5" w.c.) ±1%; All other ranges: ±0.5% @ 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).
    Stability: < ±1% per year.
    Pressure Limits: Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5", 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in w.c.: 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). For 0.25" and ±0.25" w.c. ranges: ±0.03%/°F (±0.054%/°C).
    Power Requirements: 12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.
    Power Consumption: 3 VA max.
    Output Signal: 4 to 20 mA DC into 900 Ω max.
    Zero & Span Adjustments: Accessible via menus.
    Response Time: 250 ms (damping set to 1).
    Display: Backlit 4 digit LCD 0.4" height LED indicators for set point and alarm status.
    Electrical Connections: 15 pin male high density D-sub connection. 18" (46 cm) cable with 10 conductors included. 4' and 10' cables available.
    Process Connections: 1/8" female NPT. Side or back connections.
    Mounting Orientation: Mount unit in vertical plane.
    Size: 5" (127 mm) OD x 3-1/8" (79.38 mm).
    Weight: 1.75 lb (794 g).
    Agency Approvals: CE.
    SWITCH SPECIFICATIONS
    Switch Type: 2 SPDT relays.
    Electrical Rating: 1 A @ 30 VAC/VDC.
    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
    • Full scale accuracy of 1% even on extremely low ranges, and 0.5% for ranges above 5 in w.c. provide for greater measurement precision
    • Secure menu program provides access to device operation only for the right skill level