Description
Dwyer 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/in�. Series DH Digihelic� Differential Pressure Controller, 3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow
- 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. 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 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.
- Service: Air and non-combustible, non-conducting compatible gases.
- Housing Material: ABS plastic, UL approved 94-V-0.
- Accuracy: +/-0.5% at 77Deg F (25Deg C) including hysteresis and repeatability.
- Stability: < +/-1% per year.
- Pressure Limits: Ranges ?2.5" w.c. = 2 psi; 5": 5 psi; 10": 5 psi; 25": 5 psi; 50": 5 psi; 100": 9 psi.
- Temperature Limits: 32 to 140Deg F (0 to 60Deg C).
- Compensated Temperature Limits: 32 to 140Deg F (0 to 60Deg C).
- Thermal Effects: 0.020%/Deg F (0.036/Deg C) from 77Deg F (25Deg C).
- Power Requirements: High Voltage Power = 100 to 240 VAC, 50 to 400 Hz or 132 to 240 VDC. Low Voltage Power = 24 VAC +/-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.
- 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 3/16" OD x 1/8" 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" (45 x 92 mm).
- Weight: 14.4 oz (408 g).
- Serial Communications: Modbus� RTU, RS485, 9600 Baud.
- Agency Approvals: CE, UL
Product Features
Extended Information
Technical Specs
Prop 65 Warning: Product's may contain one or more substances or chemicals known to the State of California to cause cancer, birth defects, or reproductive harm.
