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Metrys The Metrys wordmark, set in a high-contrast swash serif.
A Metrys ultrasonic bulk water meter with a blue flanged body, two brass-capped transducer ports and a blue electronics head.
A Metrys ultrasonic bulk water meter seen from an angle, showing the blue flanged spool, transducer cables and the electronics head.
Ultrasonic bulk water meter, drawn illustration

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A Metrys ultrasonic bulk water meter with a blue flanged body, two brass-capped transducer ports and a blue electronics head.
A Metrys ultrasonic bulk water meter seen from an angle, showing the blue flanged spool, transducer cables and the electronics head.
Ultrasonic bulk water meter, drawn illustration

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Smart water meters US-B

Ultrasonic Bulk Water Meter

A flanged ultrasonic bulk meter, DN40 to DN150, with a turndown of R250.

Nominal size
DN40
Q3 permanent flow
32 m³/h
R value (Q3/Q1)
250
Communication
Wired M-Bus

Select nominal size (DN)

Specifications update with the selected size.

DN40 1½″ DN50 2″ DN65 2½″ DN80 3″ DN100 4″ DN150 6″

Documents

Download datasheet (Opens in a new tab)

Overview

Why buyers choose it

  • R250 turndown

    At DN100 the measuring range runs from 0.64 to 200 m³/h, so night flow is inside it.

  • No moving parts

    Transit-time measurement leaves nothing in the bore to wear, stall or jam.

  • 18 months on board

    Stored data and power-fail protection keep the record intact through a lost supply.

  • M-Bus, pulse and 4–20 mA

    Reads into an M-Bus network, a pulse counter or a PLC; RS485 to order.

In detail

A bulk meter on a supply main or a building inlet spends much of the night at a small fraction of its rated flow, and a mechanical meter at that end of its range under-reads or stops. This meter measures ultrasonically: it times pulses sent with and against the flow and calculates the velocity from the difference, so there is no rotor to wear, stall or be jammed by debris.

It is built as a flanged spool from DN40 to DN150 with a turndown of R250. At DN100 that means the meter measures within its limits of error from 0.64 m³/h up to an overload flow of 200 m³/h. The limit of error is ±2% between Q2 and Q4 and ±5% between Q1 and Q2. It is offered for maximum admissible pressures of 10 or 16 bar, falls in pressure loss class ΔP40, and can be installed horizontally or vertically.

M-Bus is the standard remote interface, with an infrared port for reading on site, a pulse output and a 4–20 mA output; RS485 can be supplied to order. The meter is powered from a lithium battery or from the M-Bus line. It stores 18 months of data, and if power is lost the accumulated volume and the time are saved, and metering resumes by itself when power returns.

The electronics are sealed to IP68 and rated for ambient temperatures from −25 to +55 °C at up to 90% relative humidity, with a service life of at least six years. It is installed with the arrow on the body pointing with the flow, a control valve and strainer upstream, eight pipe diameters of straight run before the meter and six after.

Technical specifications

Selected size: DN40

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

Metrological

Nominal size DN40
R value (Q3/Q1) 250
Register type Ultrasonic, transit-time, electronic display
Maximum permissible error, Q1 to Q2 ±5%
Maximum permissible error, Q2 to Q4 ±2%

Hydraulic

Q3 permanent flow 32 m³/h
Q1 minimum flow 0.128 m³/h
Maximum working pressure 16 bar
Q2 transitional flow 0.208 m³/h
Q4 overload flow 40 m³/h
Pressure loss class ΔP40

Electrical

Battery type Lithium; can also be powered from the M-Bus line

Communication

Communication Wired M-Bus

Environmental

IP rating IP68

Dimensions and installation

Length 200 mm
Schematic, not to scale
Length 200 mm
Orientation limitation Horizontal or vertical

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.

    Battery type Lithium; can also be powered from the M-Bus line

  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.

  8. Connections

    Joins the meter to the pipework.

Download centre

Everything you need to specify.

Documents for the Ultrasonic Bulk Water Meter.

Approvals and certificates

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