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Multi Jet Dry Dial Water Meter, Class B

A Metrys multi-jet dry-dial water meter, its register lid hinged open, on a blue body with brass threaded tailpieces.

Multi-jet water meter, drawn illustration

Water meters MJ-B

Multi Jet Dry Dial Water Meter, Class B

A dry dial multi-jet in brass, cast iron or plastic, DN15 to DN50.

Nominal size: DN15
Q3 permanent flow: 1.5 m³/h
Accuracy class: Class B (ISO 4064:1993)
Maximum working pressure: 16 bar

Select nominal size (DN)

Specifications update with the selected size.

DN15 ½″ DN20 ¾″ DN25 1″ DN32 1¼″ DN40 1½″ DN50 2″

Documents

Download datasheet

Overview

Why buyers choose it

Three bodies, one meter

Brass, cast iron or plastic, so the body suits the installation without changing the metering.
Adjustment inside or outside

Chosen to suit how the meter will be verified once it is in service, rather than after the fact.

Frost resistant register

The vacuum-sealed register survives the cold that splits a wet dial.
Magnetically driven, magnet protected

The drive is shielded, so the most common tampering route is closed.

In detail

This is the long-running class B multi-jet, offered with a brass, cast iron or plastic body and with the adjusting device inside or outside depending on how the meter will be verified in service.

The register is vacuum sealed and frost resistant, driven magnetically and protected against an external magnet. It covers DN15 to DN50 with nominal flows from 1.5 to 15 m³/h.

One point to read carefully before it goes on a schedule: this meter is declared to the 1993 edition of ISO 4064, in accuracy class B. The current edition replaced classes A, B and C with classes 1 and 2 and the Q1–Q4 flow points, and the two are not interchangeable — a specification asking for class 2 is not asking for class B. Where a tender names the current edition, the R160 multi-jet is the meter that answers it.

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
Accuracy class	Class B (ISO 4064:1993)
Register type	Multi jet, dry dial, vacuum sealed
Maximum permissible error, Q1 to Q2	±5%
Maximum permissible error, Q2 to Q4	±2% (hot-water version ±3%)

Hydraulic

Q3 permanent flow	1.5 m³/h
Q1 minimum flow	0.03 m³/h
Maximum working pressure	16 bar
Q2 transitional flow	0.12 m³/h
Q4 overload flow	3 m³/h

Materials

Body material	Brass, cast iron or plastic

Environmental

Temperature class	≤30 °C (hot-water version ≤90 °C)

Approvals

Standards	ISO 4064:1993

Dimensions and installation

Connection thread	G3/4" B
Length	165 mm
Height	104 mm
Width	99 mm

Parts

Parts of a multi-jet 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.

Lid

Caps the register and keeps water and debris off the dial.
Register

Totalises and displays the water passed.

Register type Multi jet, dry dial, vacuum sealed
Register ring / seal

Seals the register housing against water ingress.
Measuring chamber insert (with jets)

Directs several jets onto the impeller from multiple sides for balanced, even wear.
Impeller

Turns with the combined jets and drives the register.
Strainer

Screens out grit and debris before the measuring element.
Body

Houses the measuring element and carries the flow.

Body material Brass, cast iron or plastic
Tailpieces / connections

Threaded couplings that join the meter to the pipework.

Connection thread G3/4" B

Download centre

Everything you need to specify.

Documents for the Multi Jet Dry Dial Water Meter, Class B.

Approvals and certificates

Multi Jet Dry Dial Water Meter, Class B

Why buyers choose it

Three bodies, one meter

Adjustment inside or outside

Frost resistant register