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Metrys The Metrys wordmark, set in a high-contrast swash serif.
A Metrys Woltman super hot water meter with a red flanged body, bolted cover and a black register housing with its lid open.
Woltmann bulk water meter, drawn illustration

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A Metrys Woltman super hot water meter with a red flanged body, bolted cover and a black register housing with its lid open.
Woltmann bulk water meter, drawn illustration

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Water meters WP-SH

Woltman Super Hot Water Meter

A Woltman bulk meter rated for water up to 130 °C, DN40 to DN200.

Nominal size
DN40
Q3 permanent flow
15 m³/h
Temperature class
Up to 130 °C
Maximum working pressure
16 bar

Select nominal size (DN)

Specifications update with the selected size.

DN40 1½″ DN50 2″ DN65 2½″ DN80 3″ DN100 4″ DN125 5″ DN150 6″ DN200 8″

Documents

Download datasheet (Opens in a new tab)

Overview

Why buyers choose it

  • Rated to 130 °C

    For lines hotter than the 90 °C at which standard hot-water meters stop.

  • Removable mechanism

    The measuring element comes out without cutting the body from the line.

  • Magnetically driven dry dial

    Vacuum sealed and unaffected by an external magnet, so it stays readable and is hard to tamper with.

  • Register turns 360°

    The dial can be rotated to face the reader in any installation.

In detail

Standard hot-water meters are rated to 90 °C. On industrial and commercial lines that carry water hotter than that, a standard meter is working outside its rating. This Woltman meter is rated for water up to 130 °C, in flanged sizes from DN40 to DN200 with permanent flows from 15 to 250 m³/h.

It is a velocity meter: a rotor set in line with the flow turns in proportion to the velocity, which keeps the head loss low at the high flows a bulk line carries. The measuring mechanism is removable, so it can be exchanged without taking the body out of the line. At DN100 the meter starts measuring at 1.8 m³/h and is rated for an overload flow of 120 m³/h.

The register is a vacuum-sealed dry dial, driven magnetically and unaffected by an external magnetic field, and it can be turned through 360° to face the reader wherever the meter sits. It reads to 999,999 m³, in steps of 0.001 m³ up to DN65 and 0.01 m³ from DN80. A pulse output is available as an option.

The meter is declared to ISO 4064 in accuracy class B, the classification of the 1993 edition, with limits of error of ±5% in the lower flow zone and ±2% above it, and it is rated for 16 bar. It is installed with the register facing upward and the flow following the arrow cast on the body, behind a strainer, with ten pipe diameters of straight run upstream and five downstream, and the pipe kept full of water.

Technical specifications

Selected size: DN40

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

Metrological

Nominal size DN40
Accuracy class Class B (ISO 4064:1993)
Register type Dry dial, vacuum sealed, magnetically driven, rotatable through 360°
Maximum permissible error, Q1 to Q2 ±5%
Maximum permissible error, Q2 to Q4 ±2%
Indicating range 999,999 m³
Resolution of indicating device 0.001 m³

Hydraulic

Q3 permanent flow 15 m³/h
Q1 minimum flow 0.45 m³/h
Maximum working pressure 16 bar
Q2 transitional flow 3 m³/h
Q4 overload flow 30 m³/h

Environmental

Temperature class Up to 130 °C

Approvals

Standards ISO 4064

Dimensions and installation

Schematic, not to scale
Orientation limitation Register facing upward; flow in the direction of the cast arrow

Parts

Parts of a Woltmann meter

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

Parts of a Woltmann meter, drawn illustration Exploded illustration of a Woltmann bulk water meter's parts, numbered top to bottom: 1 register cover, 2 register, 3 register seal, 4 chamber cover, 5 helical-vane rotor, 6 body, 7 flange gaskets and bolts. 1 2 3 4 5 6 7
Illustrative: how a meter of this type is built. This model's own materials and figures are in the table and its specifications.

  1. Register cover

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

  2. Register

    Totalises and displays the water passed.

    Register type Dry dial, vacuum sealed, magnetically driven, rotatable through 360°

  3. Register seal

    Seals the register housing against water ingress.

  4. Chamber cover

    Bolted cover giving access to the measuring element inside the body.

  5. Helical-vane rotor

    Spins with the flow along its helical vanes and drives the register through a gear train.

  6. Body

    Flanged cast body that houses the rotor and carries the flow.

  7. Flange gaskets and bolts

    Seal and secure the flanged joints to the pipeline.

Download centre

Everything you need to specify.

Documents for the Woltman Super Hot Water Meter.

Approvals and certificates

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