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Metrys The Metrys wordmark, set in a high-contrast swash serif.
A Metrys ultrasonic water meter with an LCD display in a grey housing, lid open, and brass tailpieces.
A Metrys ultrasonic water meter seen from the front corner, with its grey housing closed on a brass-coloured body with threaded ends.
A Metrys ultrasonic water meter from the side, with the grey housing closed on a straight brass-coloured body marked DN20.
Domestic ultrasonic water meter, drawn illustration

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A Metrys ultrasonic water meter with an LCD display in a grey housing, lid open, and brass tailpieces.
A Metrys ultrasonic water meter seen from the front corner, with its grey housing closed on a brass-coloured body with threaded ends.
A Metrys ultrasonic water meter from the side, with the grey housing closed on a straight brass-coloured body marked DN20.
Domestic ultrasonic water meter, drawn illustration

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Smart water meters US-L

Ultrasonic Water Meter, LoRaWAN

A stainless steel ultrasonic meter that registers from 12 litres an hour.

Nominal size
DN15
R value (Q3/Q1)
160, 200 or 400
Accuracy class
2
Communication
LoRaWAN IN865

Select nominal size (DN)

Specifications update with the selected size.

DN15 ½″ DN20 ¾″ DN25 1″ DN40 1½″

Documents

Download datasheet (Opens in a new tab)

Overview

Why buyers choose it

  • Registers from 12 litres an hour

    Far below a mechanical meter's threshold, which is what stops legitimate low flow being counted as leakage.

  • 24 months on board

    The meter holds its own history, so a network outage does not leave a hole in the billing record.

  • Stainless steel body

    Corrosion resistance and strength, specified where a brass body would be the weak part.

  • Three ways to report

    LoRaWAN, wired M-Bus or pulse output — the same meter, so the reading system can be chosen last.

In detail

This meter starts registering at 12 litres an hour at DN15, well below the flow at which a mechanical meter of the same bore has stopped turning at all. There is nothing in the bore to stall: the measurement is made by timing an ultrasonic pulse with and against the flow, so there is no impeller whose bearing friction sets the lower limit.

That range is what makes district metering arithmetic work. Subtract the sum of the consumer meters from the district meter and the remainder is supposed to be the loss; if the consumer meters are blind below 30 litres an hour, a large part of that remainder is not loss but unregistered legitimate use, and the leakage figure it produces sends crews to look for water that is being drunk.

The body is stainless steel, chosen for corrosion resistance and strength rather than cost, and there are no moving parts to wear. It holds the last 24 months of readings on board, so a gap in the network does not become a gap in the record.

The same meter is supplied for LoRaWAN, for wired M-Bus, or with a plain pulse output where the reading system is already chosen. The metering is identical in each case; only the way it reports changes.

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) 160, 200 or 400
Accuracy class 2
Register type Ultrasonic, transit-time, electronic display
Maximum permissible error, Q1 to Q2 ±5%
Maximum permissible error, Q2 to Q4 ±2%

Hydraulic

Maximum working pressure 16 bar

Materials

Body material Stainless steel

Electrical

Valve control No
Tamper detection Yes

Communication

Communication LoRaWAN IN865
Data parameters transmitted Totalised volume, flow rate, battery status, fault flags

Environmental

IP rating IP68
Temperature class T50

Approvals

Standards ISO 4064

Dimensions and installation

Length 130 mm Height 75 mm
Schematic, not to scale
Length 130 mm
Connection thread G3/4"
Height 75 mm

Parts

Parts of an ultrasonic meter

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

Parts of an ultrasonic meter, drawn illustration Exploded illustration of an in-line ultrasonic water meter's parts, numbered top to bottom: 1 cover/enclosure, 2 electronics/display unit, 3 battery, 4 upstream transducer, 5 reflector, 6 downstream transducer, 7 body/measuring tube, 8 connections. 1 2 3 4 5 6 7 8
Illustrative: how a meter of this type is built. This model's own materials and figures are in the table and its specifications.

  1. Cover / enclosure

    Weatherproof shell enclosing the electronics and battery.

    IP rating IP68

  2. Electronics / display unit

    Processes the transit-time signal and shows the reading.

    Register type Ultrasonic, transit-time, electronic display

  3. Battery

    Powers the electronics for its service life without mains power.

  4. Upstream transducer

    Sends the ultrasonic pulse along the measuring path.

  5. Reflector

    Folds the ultrasonic path across the bore.

  6. Downstream transducer

    Receives the ultrasonic pulse and completes the measuring path.

  7. Body / measuring tube

    Carries the flow and holds the transducers in fixed alignment.

    Body material Stainless steel

  8. Connections

    Joins the meter to the pipework.

    Connection thread G3/4"

Download centre

Everything you need to specify.

Documents for the Ultrasonic Water Meter, LoRaWAN.

Approvals and certificates

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