Series      Digihelic® Differential Pressure Controller

DH3        Digihelic® Controller in Photohelic® Gage, Square Root Output for Flow

The Series DH3 Digihelic® Differential Pressure Controller is a 3 in 1 instrument possessing a

digital display gage, control relay switches, and a transmitter with current output all packed

in the popular Photohelic® gage style housing. 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 1% full scale accuracy on ranges down to the extremely low 0.25”

w.c. to 2.5” w.c. full scale. Ranges of 5” w.c. and greater maintain 0.5% F.S. accuracy.

Bi-directional ranges are also available.

The Series DH3 Digihelic® controller allows the selection of pressure, velocity or volumetric flow

operation in several commonly used engineering units. 2 SPDT control relays with adjustable

deadbands are provided along with a scalable 4-20 mA process output.

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 reading; digital damping for smoothing erratic process applications; scaling the 4-20

mA process output to fit your applications range and field calibration. See applications

below for some popular uses.

APPLICATIONS

       SCFM flow in ducts

       Filter status

       Static pressures in ducts or buildings

       Damper control

       Fan control

Model

Ranges

DH3-002

0-0.25” w.c.

DH3-003

0-0.5” w.c.

DH3-004

0-1” w.c.

DH3-005

0-2.5” w.c.

DH3-006

0-5” w.c.

DH3-007

0-10” w.c.

DH3-009

0-25” w.c.

DH3-010

0-50” w.c.

DH3-011

0-100” w.c.

DH3-013

0.25-0-0.25” w.c.

DH3-014

0.5-0-0.5” w.c.

DH3-015

1-0-1” w.c.

DH3-016

2.5-0-2.5” w.c.

DH3-017

5-0-5” w.c.

DH3-018

10-0-10” w.c.