Bridge Based Sensor In-Line Amplifier
Model U3W
FEATURES
• Strain gage sensor amplifier
• 18 Vdc to 32 Vdc supply voltage
• NEMA 4 housing
• Selectable excitation voltages: 3 V or 5 V @ 70 mA
• 4-20 mA analog output
• Increases signal-to-noise ratio in noisy environments
• Effects of voltage drops in excitation sources are eliminated
• Signals may be sent to the data systems from low impe-
dence sources
DESCRIPTION
The Model U3W amplifier supplies a highly regulated bridge
excitation voltage for the transducer and converts the millivolt
signal of the transducer to a 4 mA to 20 mA three-wire current
output signal. The Universal In-line features two selectable exci-
tation voltages, programmable gain settings, a wide adjustment
range on the zero, and a buffered solid-state shunt cal relay for
quick calibration.
2 Honeywell • Sensing and Control
Model U3W
PERFORMANCE SPECIFICATIONS
Characteristic Measure
Number of channels 1
Case material Plastic or painted aluminum
Mounting Use #6 or #8 screws
ENVIRONMENTAL SPECIFICATIONS
Characteristic Measure
Temperature, operating -15 °C to 71 °C [5 °F to 160 °F]
Sealing IP66 or NEMA 4
TRANSDUCER INTERFACE
Characteristic Measure
Transducer type Bridge-based sensor
Transducer excitation 3 Vdc or 5 Vdc @ 70 mA
AMPLIFIER CHARACTERISTICS
Characteristic Measure
Supply voltage 18 Vdc to 32 Vdc
Current draw 70 mA
Frequency response (-3 dB) dc: 7000 Hz with 350 ohm bridge
dc: 5000 Hz with 5000 ohm bridge
Rise time (0 % to 90 %) 54 ms with 350 ohm bridge
78 ms with 5000 ohm bridge
Zero adjustment range,
coarse ±70 %
Zero adjustment range, fine ±25 %
Span adjustment range 0.5 mV/V to 6.6 mV/V
±25 % fine adjustment
Linearity 0.02 % of full scale
Shunt calibration Solid state relay on board
Signal output 4 mA to 20 mA (three-wire)
Signal-to-noise ratio 65 db
dc power supply rejection
ratio > 110 db
OPTION CODES
2-pole active
lter
Many range/option combinations are available in
our quick-ship and fast-track manufacture pro-
grams. Please see http://sensing.honeywell.com/
TMsensor-ship for updated listings.
Filter setting 1 Hz 50 Hz
3 Hz 100 Hz
5 Hz 300 Hz
10 Hz 500 Hz
20 Hz 1000 Hz
30 Hz
MOUNTING DIMENSIONS AND CHARACTERISTICS
TYPICAL SYSTEM DIAGRAM
Not RoHS compliant
Sensing and Control
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422 USA
honeywell.com
008831-2-EN IL50 GLO
June 2014
Copyright © 2014 Honeywell International Inc. All rights reserved.
Model U3W Bridge Based Sensor In-Line Amplifier
Warranty. Honeywell warrants goods of its manufacture as
being free of defective materials and faulty workmanship.
Honeywell’s standard product warranty applies unless agreed
to otherwise by Honeywell in writing; please refer to your
order acknowledgement or consult your local sales office for
specific warranty details. If warranted goods are returned to
Honeywell during the period of coverage, Honeywell will repair
or replace, at its option, without charge those items it finds
defective. The foregoing is buyer’s sole remedy and is in lieu
of all warranties, expressed or implied, including those of
merchantability and tness for a particular purpose. In no
event shall Honeywell be liable for consequential, special, or
indirect damages.
While we provide application assistance personally, through our
literature and the Honeywell web site, it is up to the customer to
determine the suitability of the product in the application.
WARNING
PERSONAL INJURY
• DO NOT USE these products as safety or emergency
stop devices or in any other application where failure of
the product could result in personal injury.
Failure to comply with these instructions could result in
death or serious injury.
WARNING
MISUSE OF DOCUMENTATION
• The information presented in this datasheet is for
reference only. DO NOT USE this document as product
installation information.
• Complete installation, operation and maintenance
information is provided in the instructions supplied with
each product.
Failure to comply with these instructions could result in
death or serious injury.
Find out more
Honeywell serves its customers
through a worldwide network of
sales offices, representatives
and distributors. For application
assistance, current specifica-
tions, pricing or name of the
nearest Authorized Distributor,
contact your local sales office.
To learn more about Honeywell’s
test and measurement products,
call +1-614-850-5000, visit
http://measurementsensors.
honeywell.com, or e-mail inqui-
ries to info.tm @ hone yw ell.com
