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.