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Domestic Ultrasonic Water Meter

A Metrys domestic ultrasonic water meter at DN20, with an LCD register showing flow total and rate, and brass tailpieces.

Smart water meters US-D

Domestic Ultrasonic Water Meter

An ultrasonic meter with no moving parts, DN15 to DN40.

Nominal size: DN15
Q3 permanent flow: 2.5 m³/h
Accuracy class: 2
Communication: NB-IoT

Select nominal size (DN)

Specifications update with the selected size.

DN15 ½″ DN20 ¾″ DN25 1″ DN32 1¼″ DN40 1½″

Documents

Download datasheet

Overview

Why buyers choose it

Nothing turns, nothing wears

Accuracy is set by the electronics rather than by how many cubic metres have already gone through.
Registers from 0.01 m³/h

R250 turndown, so a dripping tap and a weeping cistern both appear on the bill instead of in the losses.

Reports itself

Readings are stored against the clock and sent over NB-IoT or 4G, so nobody has to open the box.
Low pressure loss

There is nothing in the flow path, so the meter costs less head than a mechanical meter of the same bore.

In detail

An ultrasonic meter times a sound pulse with the flow and against it. The difference between the two transit times gives the velocity, and there is nothing in the bore to turn — no impeller, no bearing, no gear train.

What that removes is the wear curve. A mechanical meter is at its most accurate on the day it is installed and drifts slow from then on, which is why a utility replaces meters on a rolling programme whether or not they have failed. With nothing rubbing, an ultrasonic meter's accuracy is set by its electronics rather than by its mileage.

This one covers DN15 to DN40 at an R250 turndown — it registers reliably from 0.01 m³/h, which is roughly a dripping tap — and holds class 2 accuracy. It is sealed to IP68, stores its readings against the clock, and reports over NB-IoT or 4G. Battery life is six years.

Because it measures velocity rather than displacement, it also has less pressure loss than a mechanical meter of the same bore, and it will not contaminate the supply: there is nothing in the flow path but the pipe wall.

Where it is used

Domestic
Apartment and society
Commercial

Standards

ISO 4064

Technical specifications

Selected size: DN15

Values shown apply to the selected size. A dash means the figure is not stated.

Metrological

Nominal size	DN15
R value (Q3/Q1)	250
Accuracy class	2
Register type	Ultrasonic, transit-time, electronic display
Indicating range	99999.9999
Resolution of indicating device	0.0001
Maximum permissible error, Q1 to Q2	±5%
Maximum permissible error, Q2 to Q4	±2% for water having a temperature ≤30℃; ±3% for water having a temperature >30℃

Hydraulic

Q3 permanent flow	2.5 m³/h
Maximum working pressure	16 bar
Q4 overload flow	3.125 m³/h
Pressure loss class	Δp40
Flow profile sensitivity class	U10 D5

Electrical

Battery type	Lithium, 3.6 V, 6000 mAh
Battery life	6 years
Valve control	No
Tamper detection	Yes

Communication

Communication	NB-IoT
Reporting interval	1 to 8 times a day, configurable
Data parameters transmitted	Totalised volume; removal, magnet, sensor, reverse-flow and low-battery alarms; signal quality; cell ID

Environmental

IP rating	IP68
Temperature class	T30/T50/T70

Approvals

Standards	ISO 4064

Dimensions and installation

Length	165 mm
Orientation limitation	Multi-angle installation
Connection thread	G3/4" B
Height	95 mm
Width	94 mm
Weight	0.68 kg

Parts

Parts of an ultrasonic meter

How a meter of this type is built, and what this model is made of.

Illustrative: how a meter of this type is built. This model's own materials and figures are in the table and its specifications.

Cover / enclosure

Weatherproof shell enclosing the electronics and battery.

IP rating IP68
Electronics / display unit

Processes the transit-time signal and shows the reading.

Register type Ultrasonic, transit-time, electronic display
Battery

Powers the electronics for its service life without mains power.

Battery type Lithium, 3.6 V, 6000 mAh
Upstream transducer

Sends the ultrasonic pulse along the measuring path.
Reflector

Folds the ultrasonic path across the bore.
Downstream transducer

Receives the ultrasonic pulse and completes the measuring path.
Body / measuring tube

Carries the flow and holds the transducers in fixed alignment.
Connections

Joins the meter to the pipework.

Connection thread G3/4" B

Download centre

Everything you need to specify.

Documents for the Domestic Ultrasonic Water Meter.

Approvals and certificates

Domestic Ultrasonic Water Meter

Why buyers choose it

Nothing turns, nothing wears

Registers from 0.01 m³/h

Reports itself