dwyer-inst.com
DWYER INSTRUMENTS, INC.
®
T: 219-879-8000 | F: 219-872-9057 | info@dwyermail.com
800-872-9141
FEATURES/BENEFITS
• A low differential pressure gage, switch & transmitter combination
instrument allows for local display, high/low alarm monitoring and
connectivity to building automation systems
• Full scale accuracy of 1% even on extremely low ranges, and 0.5% for
ranges above 5 in w.c. provide for greater measurement precision
•Areliablecontrollertomeasurelowdifferentialpressure,velocityorow
applications
• Secure menu program provides access to device operation only for the
right skill level
• Optional stainless steel bezel is the same installation diameter as
Magnehelic
®
GageandsimplieseldupgradetoDH3pressurecontroller
APPLICATIONS
• Cleanroom monitoring
• Filter status
• Duct or building static pressure
• Damper and fan control
DESCRIPTION
The SERIESDH3 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 ow
applications, achieving a 1% full scale accuracy on ranges down to the extremely low 0.25
in w.c. to 2.5 in w.c. full scale. Ranges of 5 in w.c. and greater maintain 0.5% FS accuracy.
Bi-directional ranges are also available.
The Series DH3 Digihelic
®
controller allows the selection of pressure, velocity or volumetric
ow 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 simplied menus which provide access
to: security level; selection of pressure, velocity or ow operation; selection of engineering
units; K-factor for use with ow sensors; rectangular or circular duct for inputting area in ow
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 t your applications range and eld calibration
SERIESDH3|DIGIHELIC
®
DIFFERENTIAL PRESSURE CONTROLLER
Note: Shown with optional -SS bezel.
Backward compatible with
Magnehelic
®
Gage.
SPECIFICATIONS
SWITCHSPECIFICATIONS
Service Air and non-combustible, compatible gases.
Wetted Materials Consult factory.
HousingMaterial Die cast aluminum case and bezel.
Accuracy
±1.5% for 0.25 in and ±0.25 in w.c. ranges. Ranges 0.5 to 5 in w.c. and corresponding bi-directional (except
±2.5 in w.c.) ±1%; All other ranges: ±0.5% @ 77°F (25°C) including hysteresis and repeatability (after 1 hour
warm-up).
Stability < ±1% per year.
Pressure Limits
Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5 in, 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in
w.c.: 9 psi.
Temperature Limits 32 to 140°F (0 to 60°C).
Compensated Temperature Limits 32 to 140°F (0 to 60°C).
Thermal Effects 0.020%/°F (0.036/°C) from 77°F (25°C). For 0.25 in and ±0.25 in w.c. ranges: ±0.03%/°F (±0.054%/°C).
Power Requirements 12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.
Power Consumption 3 VA max.
Output Signal 4 to 20 mA DC into 900 Ω max.
Zero & Span Adjustments Accessible via menus.
Response Time 250 ms (damping set to 1).
Display Backlit 4 digit LCD 0.4˝ height LED indicators for set point and alarm status.
Electrical Connections 15 pin male high density D-sub connection. 18˝ (46 cm) cable with 10 conductors included.
Process Connections 1/8˝ female NPT. Side or back connections.
Mounting Orientation Mount unit in vertical plane.
Size 5˝ (127 mm) OD x 3-1/8˝ (79.38 mm). For -SS Bezel 4-3/4˝ OD (120.7 mm) x 2-21/32˝ (67.5 mm).
Weight 1.75 lb (794 g).
Agency Approvals CE.
Switch Type 2 SPDT relays.
Electrical Rating 1 A @ 30 VAC/VDC.
Set Point Adjustment Adjustable via keypad on face.
®