Description

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

 

DWYER 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 DWYER DH Digihelic Differential Pressure 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.

 

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

 

Specifications

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.

 

Features

• 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

 

Models & Ordering

Standard Ranges

Model	Description
DH-002	Differential pressure controller, selectable engineering units: .2500″ w.c., 6.350 mm w.c., 0.635 cm w.c., 0.467 mm Hg, 0.623 mbar, 62.28 Pa, 0.623 hPa, 0.114 oz/in².
DH-004	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.
DH-006	Differential pressure controller, selectable engineering units: 5.000″ w.c., .4167 ft w.c., 127.0 mm w.c., 12.70 cm w.c., .1806 psi, .3678″ Hg, 9.342 mm Hg, 12.45 mbar, 1245 Pa, 1.245 kPa, 12.45 hPa, 2.890 oz/in².
DH-007	Differential pressure controller, selectable engineering units: 10.00″ w.c., .8333 ft w.c., 254.0 mm w.c., 25.40 cm w.c., .3613 psi, .7356″ Hg, 18.68 mm Hg, 24.91 mbar, 2491 Pa, 2.491 kPa, 24.91 hPa, 5.780 oz/in².
DH-008	Differential pressure controller, selectable engineering units: 25.00″ w.c., 2.083 ft w.c., 635.0 mm w.c., 63.50 cm w.c., .9032 psi, 1.839″ Hg, 46.71 mm Hg, 62.27 mbar, 6227 Pa, 6.227 kPa, 62.27 hPa, 14.45 oz/in².
DH-009	Differential pressure controller, selectable engineering units: 50.00″ w.c., 4.167 ft w.c., 1270 mm w.c., 127.0 cm w.c., 1.806 psi, 3.678″ Hg, 93.42 mm Hg, 124.5 mbar, 12.45 kPa, 124.5 hPa, 28.90 oz/in². NOTE: velocity & volumetric flow not available.
DH-010	Differential pressure controller, selectable engineering units: 100.0″ w.c., 8.333 ft w.c., 2540 mm w.c., 254.0 cm w.c., 3.613 psi, 7.356″ Hg, 186.8 mm Hg, 249.1 mbar, 24.91 kPa, 249.1 hPa, 57.80 oz/in². NOTE: velocity & volumetric flow not available.

 

Bi-Directional Ranges

Model	Description
DH-012	Differential pressure controller, range 0.25-0-0.25″ w.c. NOTE: velocity & volumetric flow not available.
DH-014	Differential pressure controller, range 1.0-0-1.0″ w.c. NOTE: velocity & volumetric flow not available.
DH-015	Differential pressure controller, range 2.5-0-2.5″ w.c. NOTE: velocity & volumetric flow not available.
DH-016	Differential pressure controller, range 5-0-5″ w.c. NOTE: velocity & volumetric flow not available.
DH-017	Differential pressure controller, range 10-0-10″ w.c. NOTE: velocity & volumetric flow not available.