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Series Digihelic® Differential
Pressure Controller
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DH3 Digihelic® Controller in Photohelic®
Gage, Square Root Output for Flow
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The Series DH3 Digihelic® Differential Pressure Controller is a 3 in 1 instrument possessing a
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digital
display gage, control relay switches, and a transmitter with current output
all packed
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in the popular Photohelic® gage style housing. Combining these 3
features allows the
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reduction
of several instruments with one product, saving inventory, installation time
and
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money. The Digihelic® controller is the ideal instrument for
pressure, velocity and flow
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applications,
achieving a 1% full scale accuracy on ranges down to the extremely low 0.25
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w.c. to 2.5 w.c. full scale. Ranges of 5 w.c.
and greater maintain 0.5% F.S. accuracy.
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Bi-directional
ranges are also available.
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The
Series DH3 Digihelic®
controller allows the selection of pressure, velocity or volumetric flow
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operation in
several commonly used engineering units. 2 SPDT control relays with
adjustable
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deadbands are
provided along with a scalable 4-20 mA process
output.
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Programming is easy using the menu key to access 5 simplified
menus which provide access
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to: security level; selection of pressure, velocity or flow
operation; selection of engineering
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units; K-factor for use with flow sensors; rectangular or circular
duct for inputting area in flow
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applications; set point control or set point and alarm
operation; alarm operation as a high,
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low or high/low alarm; automatic or manual alarm reset; alarm
delay; view peak and valley
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process reading; digital damping for smoothing erratic process
applications; scaling the 4-20
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mA
process output to fit your applications range and field calibration. See
applications
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below
for some popular uses.
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APPLICATIONS
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SCFM flow in ducts
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Filter status
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Static pressures in ducts or buildings
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Damper control
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Fan control
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Model
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Ranges
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DH3-002
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0-0.25
w.c.
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DH3-003
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0-0.5
w.c.
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DH3-004
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0-1
w.c.
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DH3-005
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0-2.5
w.c.
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DH3-006
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0-5
w.c.
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DH3-007
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0-10
w.c.
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DH3-009
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0-25
w.c.
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DH3-010
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0-50
w.c.
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DH3-011
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0-100
w.c.
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DH3-013
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0.25-0-0.25
w.c.
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DH3-014
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0.5-0-0.5
w.c.
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DH3-015
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1-0-1
w.c.
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DH3-016
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2.5-0-2.5
w.c.
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DH3-017
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5-0-5
w.c.
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DH3-018
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10-0-10
w.c.
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