Series DH Digihelic® Differential Pressure Controller
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Brand:DWYER
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Service:Air and non-combustible, compatible gases.
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Housing Material:ABS plastic, UL approved 94 V-0.
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Accuracy:±0.5% at 77°F (25°C) including hysteresis and repeatability.
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Stability:< ±1% per year.
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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.
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Temperature Limits:32 to 140°F (0 to 60°C).
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Compensated Temperature Limits:32 to 140°F (0 to 60°C).
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Thermal Effects:0.020%/°F (0.036/°C) from 77°F (25°C).
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Power Requirements:High voltage power = 100 to 240 VAC, 50 to 400 Hz or 132 to 240 VDC. Low voltage power = 24 VDC ±20%.
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Power Consumption:Low voltage power = 24 VDC - 130 mA max; High voltage power = 100 to 240 VAC, 132 to 240 VDC - 7VA max.
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Output Signal:4-20 mA DC into 900 Ω max.
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Zero & Span Adjustments:Accessible via menus.
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Response Time:250 ms.
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Display:4 digit LCD 0.4" height. LED indicators for set point and alarm status.
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Electrical Connections:Screw terminals.
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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.
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Enclosure Rating:Face designed to meet NEMA 4X (IP66).
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Mounting Orientation:Mount unit in horizontal plane.
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Size:1/8 DIN.
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Panel Cutout:1.772 x 3.620 in (45 x 92 mm).
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Serial Communications:Modbus® RTU, RS485, 9600 Baud.
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Agency Approvals:CE, UL.
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Switch Type:2 SPDT relays.
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Electrical Rating:8 amps at 240 VAC resistive.
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Set Point Adjustment:Adjustable via keypad on face.
Description
The SERIES 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 Digihelic® 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.
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 readings; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your application's range; Modbus® communications; and field calibration.
With all this packed into one product it is easy to see why the Digihelic® controller is the only instrument you will need for all your pressure applications.
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
