Digital Differential Pressure Control


Dwyer Instruments, Inc., the preferred source for your complete range of practical and affordable instrumentation, is announcing the release of its NEW DH3 Series Digihelic® Differential Pressure Controller.
    The Series DH3 Differential Pressure Controller provides a 4-20 mA process output, 2 SPDT relays with adjustable deadbands, and a large, bright backlit LCD display. The DH3 offers simplified programming via a menu key that enables the user to select: security level; set point or set point and alarm operation; auto or manual alarm reset; English or Metric engineering units; pressure, velocity or flow operation, K-factor for use with various Pitot tubes and flow sensors, circular or rectangular duct size for volumetric flow operation plus many more. The robust Photohelic® gage style aluminum housing is rated NEMA 4X on the front face when properly installed in a control panel. The sensing element can detect low differential pressures down to 0.25? w.c. up to 100? w.c. Bidirectional ranges are also available. These features make the DH3 Digihelic® Differential Pressure Controller the ideal instrument for monitoring pressures in various rooms, zones and ducts in factories, laboratories or buildings.


• Service: Air and non-combustible, compatible gases. • Wetted Materials: Consult factory. • Housing Material: Die cast aluminum case and bezel. • Accuracy: < 5" w.c. (except ±2.5" w.c.): ±1%; All other ranges: ±0.5% at 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). • Power Requirements: 12-28 VDC, 12-28 VAC 50-400 Hz. • 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.
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