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Digihelic® – Going Once,
Going Twice – Thrice!!
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and
current employees as a resource only. They may not be reproduced, published, or transmitted electronically for
commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within
these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc.
©Copyright 2011 Dwyer Instruments, Inc.
The Digihelic® Family
Indicate
Switch
Transmit
Differential Pressure Controller
Digihelic® Capabilities
Selectable Engineering Units
Pressure:
INWC PSI OZIN FTWC MMHG MMWC KPA MBAR CMWC HPA PA
0.1 or +/- 0.1 0.187 2.540 0.249 0.254 0.249 24.91
0.25 or +/- 0.25 0.144 0.467 6.350 0.623 0.635 0.623 62.28
0.5 or +/- 0.5 0.289 0.933 12.70 0.125 1.246 1.270 1.246 124.6
1 or +/- 1 0.578 1.868 25.40 0.249 2.491 2.540 2.491 249.1
2.5 or +/-2.5 1.445 0.208 4.665 63.50 0.623 6.228 6.350 6.228 622.8
5 or +/- 5 0.181 2.891 0.417 9.330 127.0 1.246 12.46 12.70 12.46 1246
10 0.361 5.781 0.833 18.66 254.0 2.491 24.91 25.40 24.91 2491
25 0.903 14.45 2.083 46.65 635.0 6.228 62.28 63.50 62.28 6228
50 1.807 28.91 4.165 93.30 1270 12.46 124.6 127.0 124.6
100 3.613 57.81 8.33 186.6 2540 24.91 249.1 254 249.1
Digihelic® Capabilities
Air Velocity:
FPM, M/S
Air Flow:
SCFM, M3/HR
Selectable Engineering Units
Digihelic® Capabilities
Display % of Full Scale Instead of Eng. Units
Records Peak & Valley Readings
Truly Universal Power Supply on DH & DHII
120 VAC; 240 VAC; & 24 VDC
(DH3 is 12-24VAC/VDC)
K-Factor Selection for Various Flow Sensors
Digital Damping of Display & Output
Digihelic® Capabilities
4 Levels of Security
Full Scale Accuracy of 0.5%
4-20 mA Output Standard on ALL Models
4 & 20 mA Process Rescaling
Modbus® Communication on DH & DHII
2 SPDT Control Relay Outputs
Digihelic® Capabilities
3 Modes of Operation
Single Set Point with Adjustable Dead Band
Dual Set Points with Adjustable Dead Bands
Single Set Point with Separate Alarm Output
LED Indication of
Set Point and Alarm
Activation
Digihelic® Capabilities
Mode with Single Set Point & Separate Alarm
Selectable:
High Alarm, Low Alarm, or High/Low
Auto or Manual Reset (Via Button on Face)
Alarm Inhibit
Alarm Time Delay
Comparing Digihelic® Housings
DH: 1/8th DIN Panel Mount IP66 Face
DHII: IP66 Weatherproof Surface Mount Housing
DH3: 3000MR Style Panel Mount Housing with IP66 Face
Comparing Digihelic® Outputs
DH & DHII: 2 SPDT 8 Amp Relays
DH3: 2 SPDT
1 Amp Relays
Comparing Digihelic®
Communication
DH & DHII: Modbus® Communication Standard
DH3: No Modbus®
Communication
Comparing Digihelic® Power
Requirements
DH & DHII: 120/240 VAC & 24 VDC Power
DH3: 12-24 VAC/VDC Power
Markets
Air Handlers / Blowers
Semicon
Pharmaceutical / Health Care
Dust Collection / Pneumatic Conveying
Mini-Environments / Gloveboxes
Spray booths
Industrial Ovens/Furnaces
Application – Industrial Blowers &
Fans
Piezo-Ring (aka Flow Ring)
Typically Offered As An Option
Maximizes Efficiency
Assists Troubleshooting
Read in CFM or DP
Application - Semiconductor
Safety Exhaust
Scrubbers/Abatement
Gas Delivery Systems
Buzz-words:
CVD
ALD
Wet-processing
Gas Delivery Cabinet
Semiconductor DH Feature Benefits
Communications – reduce overhead by
remotely monitoring and adjustment of plant-
wide equipment
Data Logging – quality assurance, defect
causation, and safety review
Direct flow indication – is exhaust or
process optimized?
Application:
Gloveboxes & Mini-Environments
Glovebox: sealed container
that allows manipulation
of objects while being in
a different atmosphere.
Mini-Environment: no
process manipulation
component
How DH is used:
Negative pressurization protect personnel
Positive pressurization protect product
Application:
Gloveboxes & Mini-Environments
Application: Bio-Chem Protection
Maintain positive pressure in tents/shelters
Filter Verification
Shelter Pressure
To
tent/shelter
Outside air – one of the most crucial
elements in maintaining a healthy building
environment
Codes require certain air changes/mixes
Digihelic® ensures that outside airflow is
correctly set
Application: Air Handlers
Application: Air Handlers
Inexpensive air handlers do not typically include complex control packages – the DH fills this void for the OEM or BAS integrator
Why DH?
Control VFD w/4-20mA output
Remote alarm capability
True flow indication for troubleshooting fan or balancing issues
Application: Air Handlers
Digihelic® provides air measurement feedback to
setpoint enabled VFDs on return and supply fans.
Alarms when flow is too low (fan problem) or too
high (closed damper).
Application: Environmental
Protection
Large Scale Power Generation
Temporary/Standby Power
Application: Environmental
Protection
Exhaust from power generation contains
small particulates that are particularly
hazardous to humans
These must be filtered and/or “burned-
off”
Application: Environmental Protection
Thermal Oxidation: burning pollutants at
high temperature
Digihelic®
Ensures smooth flow of unclean air to thermal
oxidizer
Alarms on low/high flows
Allows data logging to comply with
environmental regulations
Application: Cleanrooms
Why Upgrade Cleanroom to Digihelic®?
Monitor/control/log pressure in cleanroom
Compliance
Product Quality Issues
Clean, easy to read display
Pressure – to ensure negative pressure
Flow – to ensure minimum air changes
Digihelic™ Links
Communication
Program for the
Digihelic®
For Use with
DH or DHII
Part Number: DIGIHELIC LINKS
Digihelic™ Links
Communications Program
Enables Customer to Set or Change Any Parameter in the Digihelic® from a Computer
An Entire Plant of Digihelics® Can be Monitored/Controlled from A Single Location
User Can: Review an Event Log, Graph Data, Calibrate Zero & Span
Questions
To order a free catalog or for more information contact;
Dwyer Instruments, Inc., P.O. Box 373,
Michigan City, IN., 46361
Telephone: (800) 872-9141 or (219) 879-8000
Fax: (219) 872-9057
Internet address: www.dwyer-inst.com
E-mail: [email protected]
