DH3 Dwyer Digihelic Differential Pressure Controller

$355.00 -- Digital display gage, relay control and transmitter all in one

Purchase DH3 Dwyer Digihelic Differential Pressure Controller

Dwyer DH3 Digital Differential Pressure Controller User Manual

Dwyer DH3 Digital Differential Pressure Controller Dimensila Drawing

The Dwyer 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.

DH3 Specifications

     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" w.c.: 25 psi; �2.5", 5" w.c.: 5 psi; 10" w.c.: 5 psi; 25" w.c.:
          5 psi; 50" w.c.: 5 psi; 100" 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: 12-24 VAC/VDC.
     Power Consumption: 3 VA max.
     Output Signal: 4-20 mA DC into 900 ohms 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.
     Process Connections: 1/8" female NPT. Side or back connections.
     Mounting Orientation: Mount unit in vertical plane.
     Size: 5" (127 mm) O.D. 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 amp @ 30 VAC/VDC.
     Set Point Adjustment: Adjustable via keypad on face

DH3 Applications

� SCFM flow in ducts

� Filter status

� Static pressures in ducts or buildings

� Damper control

� Fan control

See also DH Digihelic Differential Pressure Controller
DHII Digihelic Differential Pressure Controller, NEMA 4X

Order accessories below:

Purchase DH3 Dwyer Digihelic Differential Pressure Controller

Choose Range: DH3-002, 0-0.25" wc; DH3-003, 0-0.5" wc; DH3-004, 0-1" wc; DH3-005, 0-2.5" wc; DH3-006, 0-5" wc; DH3-007, 0-10" wc; DH3-009, 0-25" wc; DH3-010, 0-50" wc; DH3-011, 0-100" wc; DH3-013, 0.25-0-0.25" wc; DH3-014, 0.5-0-0.5" wc; DH3-015, 1-0-1" wc; DH3-016, 2.5-0-2.5" wc; DH3-017, 5-0-5" wc; DH3-018, 10-0-10" wc

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