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.