DH-012 | Differential pressure controller | range 0-25-0-0.25
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DH-012 | Differential pressure controller | range 0-25-0-0.25" w.c. NOTE: velocity & volumetric flow not available. | Dwyer

Differential pressure controller, range 0-25-0-0.25" w.c. NOTE: velocity & volumetric flow not available.

Brand: DwyerSKU: DH-012
Dwyer | DH-012
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Overview Details for DH-012

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Differential pressure controller | range 0-25-0-0.25" w.c. NOTE: velocity & volumetric flow not available.

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. 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.

NIST CALIBRATION available in Product Configurator.

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
  • 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

Specifications

Series
DH Digihelic® Differential Pressure Controller
Category/Type
Pressure
Type
Differential Pressure
Series
DH Digihelic® Differential Pressure Controller
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 132to 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.

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