The engineer’s choice
Airflow measurement using
instrumented inlet rings.
Headquarters - Farmington, CT
– 250,000 square feet
– 275 employees
– Contract manufacturing
– Acoustic testing chamber
– Complete air testing lab on site
– ISO 9001 and ISO 14001 certifications
– Distribution centers in Farmington, CT and Toronto, Canada
ebm-papst is an innovator and market leader in fans, blowers, and
motors with core competencies in motor technology, aerodynamics, and
electronics. With over 15,000 products, we provide solutions to a wide
range of markets including Air-conditioning and Ventilation, Appliance,
Commercial Refrigeration, Heating, Industrial, Lighting, IT / Telecom, Medical,
Transportation and more.
Support when and where you need it
Knowledgeable field sales professionals are close by for face-to-face meetings.
Dedicated inside sales associates fulfill all of your ordering needs. To assist
you with order management, our Customer Relations department provides
automated services such as shipment notifications, reorder notifications, and
invoicing.
Design and manufacturing
Beginning with the initial product concept, our application engineers work in
tandem with customers to select the best air moving solution to suit specific
goals and requirements. Once the prototype has been established, it can
then be tested in our state-of-the-art airflow testing chambers to optimize
performance. Each chamber has been designed to meet AMCA 210 and
ISO 5801 requirements. In addition to our airflow testing capabilities,
ebm-papst can conduct comparative sound, temperature, and velocity
tests. The electrical engineering team can design everything from simple
fan controllers for monitoring fan speed to complex controllers and power
supplies, filtering, and specific communication protocols.
Logistics and inventory management programs
Our facilities feature over 90,000 square feet of climate-controlled warehousing,
and utilize bar coding for real-time inventory management.
Supply chain
management programs such as Kanban, demand/pull, safety stock, consignment,
and local warehousing can be customized to your needs.
About ebm-papst North America
2
Passionate about air technology and drive engineering
The ebm-papst product portfolio numbers over 15,000 products. We offer
the right solution for almost every air technology and drive engineering
task. In addition, we work with you to develop very customized solutions
that extend beyond our current product line. This is made possible by our
extensive team of over 650 dedicated engineers and technicians out of our
three central locations in Germany.
World Headquarters: Mulfingen, Germany
– ebm-papst established in 1963
– Manufacturing: Germany, Hungary, USA, Slovenia, India, China, Czech
Republic and Italy
– Worldwide revenue over 1.5 billion USD
– 57 sales and distribution groups worldwide
– 11,000+ employees worldwide
– Ship over 46 million products annually
– Certifications: ISO 9001, ISO 14001 & RoHS compliant
– Over 1,000 patents held in design
Core competencies: motor technology, aerodynamics and electronics
Our innovative technologies keep turning into new industrial standards.
Our advantage: We consider aerodynamic relationships as a whole. Thus
we combine benchmark-setting motor technology with the intelligence of
state-of-the-art electronics and aerodynamically optimized shapes.
About ebm-papst worldwide
The system solution that results from these three core competencies has
a synergy that is unique in all the world and makes up the majority of our
product line.
GreenTech® EC technology: Our motor for the future
Virtually our entire product range is now available with GreenTech, the
leading edge EC technology. GreenTech EC motors deliver unparalleled
energy efficiency when compared to conventional AC Technology. With wear-
free and maintenance-free performance, longer service life, lower noise,
intelligent electronic control, and higher aerodynamic efficiency, GreenTech
EC motors from ebm-papst are the future of air moving technology.
Passion, quality and responsibility: Three reasons for our success
Only real passion for fans and motors makes the highest level of achievement
possible. With a clear organizational structure, flat hierarchies and a high
degree of personal responsibility, we create the perfect foundation - not
only for technological innovation, but also for excellent service and active
dedication to closely working with our customers.
Of course, our products are also produced with the highest quality - at a total
of 17 facilities worldwide. Our quality management is uncompromising and
is present in every process stage. This is also confirmed by our certification
of compliance with the international standards ISO 9001, ISO/TS 16949
and the standard ISO 14001.
33
The symbol of our commitment
GreenTech is a name put to the philosophy ebm-papst has used for decades:
“each new product that we develop has to be better than its predecessor in
terms of economy and ecology.” Our company philosophy is not just for
designing new and more efficient fans and blowers; it is in practice in the
offices and factories, locally and internationally. At the U.S. headquarters, two
separate arrays of solar panels have been installed to provide the engineering
building with electricity, along with additional renovations that make the
facilities even more environmentally friendly.
GreenTech symbolizes our continuous commitment, achievements, and passion
to provide customers with high quality products through the use of modern
development and production methods, responsible business practices and
initiatives that benefit not only the user, but the environment as well.
What is EC Technology?
EC technology is an important factor in our GreenTech philosophy. ebm-papst
EC fans use permanent magnet external rotor DC motors with fully integrated
electronic commutation (EC) and AC to DC power conversion. EC motors give
the flexibility of connecting to AC mains with the efficiency and simple speed
control of a DC motor. With EC fans, the user benefits from the innovative
commutation without wear-and-tear on the motor. The EC motor compares
to the direct current shunt-wound motor except that the magnetic field is
generated by permanent magnets inside the rotor.
With this technology, EC motors and fans can be easily controlled, are
maintenance-free, offer outstanding efficiency and have a considerably long
service life. The variable speed range possible in EC technology makes using a
multitude of individual models a thing of the past.
Our R&D efforts are not only focused on saving energy. In terms of air
performance and low noise, our products exceed the toughest specifications.
EC technology pays off for every owner or operator, while conserving precious
energy resources. When you use intelligent ebm-papst EC technology in your
applications, everyone wins - companies, customers, and the environment.
GreenTech Worlds in Motion
Airflow measurement using instrumented inlet rings
ebm-papst offers a simple airflow measurement technique for backward-
curved centrifugal fans using modified versions of inlet rings (IR) typically
used with these fans to maximize performance. The technique is based
on the Bernoulli and Continuity equations, which allow calculation of
flow through a converging nozzle based upon measurement of the static
pressure drop across the nozzle.
The application is of the form Q = 9.29k • P, where:
Q = airflow in CFM
k = nozzle calibration factor
∆P = static pressure drop across the nozzle in inches H2O
= standard air density of .075 lbs/ft3
= actual air density in lbs/ft3
The calibration factor "k" has been empirically determined for each
IR at standard air density of .075 lbs/ft3. Large variations from
this air density can effect the measurement and can be taken into
account using the ration, otherwise this term can be dropped
from the equation.
Two types of instrumented inlet rings are available for each
impeller size. One type uses a single pressure tap positioned
near the discharge end of the IR. The 2nd type uses four pressure
taps spaced along the circumference of the IR, connected with
tubing to form a piezometer ring. The piezometer ring averages
the static pressure measurements around the circumference of
the IR to provide a more accurate flow measurement in case of
uneven pressure distribution around the inlet. In either case, the
customer connection on the inlet ring is to a single pre-mounted
tube connector, suitable for pneumatic tubing with an internal
diameter of 4 mm. This connection should run to the low pressure
side of a differential pressure transducer (DPT), while the pressure
tap in front of the IR is connected to the high pressure side of the
DPT. If the DPT is mounted near the front of the IR but out of the
airstream, then the high pressure tap on the DPT is suitable and no
additional pressure tap is needed.
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Inlet Ring Part Numbers
Inlet Ring Part Numbers
Find the proper instrumented inlet ring P/N based on the impeller size and type (e.g., 3D EC). Choose the P/N for either the inlet ring with a single pressure
tap or for the version with multiple taps connected in a piezometer ring. In cases where there are multiple listings for a single impeller size, please discuss the
choice of the correct inlet ring with an ebm-papst applications engineer.
Inlet Rings
Size (mm) Impeller & fan type Part no. w/o pressure tap
(for dimensional reference only) Part no. with 1 pressure tap Part no. with piezometer ring k-value
250 2D AC/EC 96359-2-4013 25002-2-4013 25001-2-4013 69
250 2D EC 25020-2-4013 25040-2-4013 25030-2-4013 67
250 2D EC + airfoil 25070-2-4013 25075-2-4013 25080-2-4013 70
280 2D AC/EC 96360-2-4013 28002-2-4013 28001-2-4013 88
280 2D EC 28020-2-4013 28040-2-4013 28030-2-4013 87
280 2D EC + airfoil 28070-2-4013 28075-2-4013 28080-2-4013 93
310 3D AC/EC 31050-2-4013 31100-2-4013 31080-2-4013 120
310 3D AC/EC 31051-2-4013 31110-2-4013 31090-2-4013(1) 103
310 2D EC 31020-2-4013 31060-2-4013 31040-2-4013 108
310 2D EC 31570-2-4013 31575-2-4013 31580-2-4013 116
310 airfoil 31470-2-4013 31475-2-4013 –116
355 3D AC/EC 35560-2-4013 35600-2-4013 35580-2-4013 155
355 3D AC/EC 35561-2-4013 35610-2-4013(1) 35590-2-4013(1) 138
355 2D EC 35520-2-4013 35540-2-4013 35530-2-4013 141
355 2D EC + airfoil 35670-2-4013 35675-2-4013 35680-2-4013 148
400 3D AC/EC + 2D AC 54476-2-4013 54515-2-4013 54500-2-4013 183
400 2D EC 40020-2-4013 40040-2-4013 40030-2-4013 161
400 2D EC + airfoil 40070-2-4013 40075-2-4013 40080-2-4013 188
450 2D AC/EC 54478-2-4013 54514-2-4013 54510-2-4013 217
450 3D AC/EC 63045-2-4013 64015-2-4013 64005-2-4013 214
450 2D EC 45020-2-4013 45040-2-4013 45030-2-4013 225
450 2D EC + airfoil 45070-2-4013 45075-2-4013 45080-2-4013 240
500 2D EC 54480-2-4013 54518-2-4013 54516-2-4013 265
500 2D EC + 3D AC/EC + airfoil 63072-2-4013 64025-2-4013 64002-2-4013 281
560 2D EC + 3D AC/EC + airfoil 63071-2-4013 64030-2-4013 64001-2-4013 348
630 3D AC/EC + airfoil 63070-2-4013 64040-2-4013 64000-2-4013 438
710 3D AC/EC + airfoil 71070-2-4013 71075-2-4013 71080-2-4013 545
Note: Subject to alterations. (1) Short inlet ring.
Instrumented Inlet Rings
Select Pressure Transducer Range
It's important to the accuracy of the flow measurement to select a differential pressure transducer (DPT) with a range appropriate to the expected pressure
differential. It's best to choose a DPT with a range that exceeds the maximum expected pressure differential by a small safety margin. Excessive range will
impact the flow measurement accuracy because the DPT accuracy is typically specified as a percent of full scale.
To find the proper pressure transducer range:
1. Determine the maximum CFM flow rate expected from the fan over its operating range as installed in the application. If this info isn't available, use the free
airflow as provided in the fan specification.
2. Use Chart 1 to find the pressure differential in inches w.g. for given flow and impeller size.
3. Select a differential pressure transducer with an appropriate range based on the pressure differential determined in step 2.
Chart 1 - Pressure Differential vs Air Flow for Available Impeller Sizes
0.000
0.001
0.010
0.100
1.000
10.000
1
0 100 1000 10000
fm]
delta p [in. H2O]
250
280
310
355
400
450
500
560
630
impeller
size
(mm
)
flow [cfm]
67
www.ebmpapst.us Printed in the USA - 05/2016
The engineer’s choice
ebm-papst Inc.
North America
100 Hyde Road
Farmington, CT 06034
Phone + 1 860-674-1515
Fax + 1 860-674-8536
sales@us.ebmpapst.com
© ebm-papst Inc. 2016.
ebm-papst Inc. reserves the right to change any specifications or data without notice.
