Dwyer 3-in-1 Digital Differential Pressure Gauge, Switch and Transmitter

Dwyer 3-in-1 Digital Differential Pressure Gauge, Switch and Transmitter


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Item # DH-DWYER Brand: Dwyer Instruments


3 in 1 Instrument: Gage, Switch and Transmitter, Square Root Extractor for Air Flow.

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  • Description
  • Additional information


The Series DH Digihelic Differential Pressure Controller is a 3 in 1 instrument possessing a digital display gauge, 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.

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.


  • Mounting Style: Horizontal
  • Temp Rating: 32 – 140 F
  • Process Connections: Compression fitting for 1/8″ ID X 1/4″ OD tubing
  • Material: ABS plastic, UL approved 94 V-0
  • Size: 1/8 DIN
  • Electrical Connections: Screw Terminals

Applications: CFM duct flow; Industrial ovens air flow; Filter status; Clean room pressurization; Fume hood air flow; Surgical and medical room pressurization; Damper and fan control.

Additional information

Weight N/A

Dwyer Instruments

Item Type

Gauge / Switch – Digital

Pressure Rating

2 psi, 5 psi, 9 psi

Range in w.c.

0.25", 100.0", 5.0"




Within 0.5%

DH-002Pressure Rating: 2 psiRange in w.c.: 0.25"
DH-006Pressure Rating: 5 psiRange in w.c.: 5.0"
DH-010Pressure Rating: 9 psiRange in w.c.: 100.0"
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