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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 Series DHII
Digihelic® II Differential Pressure Controller
NEMA 4 (IP66) Housing with Large, Bright LCD, Square Root Output for Flow

The Digihelic® Controller just got better with the New Series DHII Differential Pressure Controller. The DHII takes all the fabulous features of the standard Digihelic® Pressure Controller and packages them in a robust NEMA 4 (IP66) housing.

The Digihelic® II Pressure Controller combines the 2 SPDT control relays, 4-20 mA process output and Modbus®communications with a large, brightly backlit 4 digit LCD display that can easily be seen from long distances. The electrical wiring has also been enhanced in the DHII with its detachable terminal blocks. The removable terminals allow the install to easily wire the terminal block outside the housing and then attach to the circuit board, reducing wiring difficulties and installation time on the process.

The Digihelic® II Differential Pressure Control in the new NEMA 4 (IP66) enclosure enables this product to be the perfect choice when mounting pressure controls outdoors in such applications as rooftop air handlers. This housing also makes it the ideal solution for surface mounting in clean rooms or facilities where water or a cleaning solution is utilized in maintaining plant cleanliness.


Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult Factory.
Housing Material: Aluminum, glass.
Accuracy: ±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 in. w.c. = 2 psi; 5": 5 psi; 10": 5 psi; 25": 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 ohms max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms (dampening set to 1).
Display: 4 digit backlit LCD 0.6" height. LED indicators for set point and alarm status.
Electrical Connections: Euro type removable terminals blocks with watertight conduit fittings for 1/2" watertight conduit. 
Process Connections: 1/8" female NPT.
Enclosure Rating: Designed to meet NEMA 4X (IP66).
Mounting Orientation: Mount unit in horizontal plane. 
Size: 4.73" x 4.73" x 3.43" (120 x 120 x 87.1 mm).
Weight: 2 lb 10 oz (1.19 kg). 
Serial Communications: Modbus® RTU, RS485, 9600 Baud. 
Agency Approvals: CE and UL.

Switch Type: 2 SPDT relays.
Electrical Rating: 8 Amps at 240 VAC resistive

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3.00 LBS
4.00 (in)
5.00 (in)
5.00 (in)