w-H2O Series
USW-3
ULTRASONIC WATER METER
• Class C
• Potable
water
metering,
0.1°C - 60°C
• No moving
components
• Tamper-proof
• Leak detection
• AMR ready
• Insensitive to sand,
sediment or
other particles
• Vacuum-sealed for
humidity resistance
• Long lifespan with
consistent performance
USW-3 represents the latest
innovation of USonic Metering’s
w-H2OTM inline ultrasonic water
meter series.
This smart meter, in accordance with
OIML R49, is designed specifically to
capture water consumption in residential
& commercial applications while
integrating into an AMR/AMI network
and billing solutions.
EACH AND EVERY
DROP COUNTS
Manufactured to be rugged, the USW-3 water meter has a sensor
body constructed of high quality brass. With no moving components,
once installed the meter remains accurate and maintenance free.
The non-obstructive sensor design leads to no blockage and
miniscule pressure drops. This robust design is ideal for challenging
environments such as those in desert applications.
With USonic METERING's USW-3
you can:
• Remain proactive and identify leakage in order
to capture lost revenue by detecting leaks as
low as a few drops per second.
• Guarantee enduring meter performance even
in harsh environments such as Middle East and
Africa, as the unit is insensitive to sand,
sedimentation and other particles.
• Reliably operate the unit with excellent long-
term stability backed by a 10 year warranty,
as accuracy does not degrade over time.
• Combat environmental elements with the
sand-proof and submersible IP68 enclosure.
• Reduce operational costs over the long run.
• Prevent condensation from display and
electronics due to vacuum-sealed design.
• Capture precise readings with robust ultra-
sonic transit-time technology.
• Ensure optimal field performance with a 15
year battery life.
• Register accurate readings as air is not measured.
• Detect reverse flow.
• Reliably integrate into AMR/AMI networking
solutions using M-Bus, radio and pulse.
• Automatically switch to power over M-Bus
when available to conserve battery.
• Remain confident with a tamperproof design.
• Reduce pump costs with our low pressure
drop design.
EACH AND EVERY
DROP COUNTS
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WAT E R
Nominal Overload Transitional Minimum Starting Pressure Loss
Size
Flowrate Q3 Flowrate Q4 Flowrate Q2 Flowrate Q1 Flowrate QS ΔP @ Q3
(mm) (in) (m3/h) (gpm) (m3/h) (gpm) (1/h) (gph) (1/h) (gph) (1/h) (gph) (Bar)
15 ½ 2.5 11 3.125 13.8 16 4.22 10 2.64 2 .52 0.63
20 ¾ 4 17.6 5 22 25.6 6.7 16 4.22 3 .79 0.40
25 1 6.3 27.7 7.8 34.3 40.3 10.6 25.6 6.7 4 1 0.25
32 1 1/4 10 44 12.5 55 64 16.9 40 10.5 6 1.5 0.25
40 1½ 16 70.4 20 96.8 102.4 27 60 15.8 8 2.1 0.25
50+ 2 Please check the big sizes and C & I datasheet.
Maximum Permissible Flow Meter Indication Error
OIML R 49-1 Class 2
OPERATING % of Flowrate
PRINCIPLE +5
+2
Flowrate
Using the ultrasonic Qs Q1 Q2 Q3 Q4
transit-time measuring -2
technology, emitted
-5
ultrasound beams are sent
back and forth between • USW-3 Provides Better Accuracy Than R49 Standard.
two ultrasonic transducers.
The liquid velocity is
determined by the Pressure Loss vs. Flowrate
difference in measured
transit-times between
beams sent into
(downstream) and against
(upstream) the direction of
liquid flow.
• Non-obstructive Sensor Design Guarantees Low Pressure Loss.
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EACH AND EVERY DROP COUNTS
Rated Operating Conditions
Maximum Admissible Pressure, Operating (MAP) : 16 bar (1.6 MPa)
Static Current : <10uA
Battery Life : 15 years
Network Power Supply: Automatically switch to M-Bus or
RS485 Power if available
Accuracy Class : Class 2 (OIML R49)
Metrology Class: Class C
Back Flow Detection : Yes
Operating Water Temperature :
Continuous operation : 0.1°C to 60°C (32°F to 140°F)
Ambient Class : Outdoor
Calculator Protection : IP68 waterproof, submersible
Flow Sensor Protection : IP68 waterproof, submersible
Pipe Joint Options : BSP or NPT
AMR Connectivity : M-Bus, Wireless M-Bus 433/868MHz, LORA, RS485/Modbus
Dimension:
Notes:
(1) Default pipe joint is BSP threading.
NPT threading is available upon request.
(2) L is flow sensor length. L2 is the total
of flow sensor plus extension pieces length
(3) Weight includes extension piece.
(4) 1m3/h is about 4.4 GPM.
About USonic Metering
USonic Metering is a global leader in flow and energy management solutions.
Through continuous innovation, we transform complex ultrasonic technology
into affordable, reliable solutions for accurate flow and energy measurement.
USonic Metering offers water, heat, electricity and gas meters as well as AMR/
AMI solutions. To find out how we can help today, please tell us about your
application.
Tel. +1 774 325 8000 444 W. 52nd Street.
Fax. +1 646 925 4675 New York, 10019 NY - USA
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