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Metrys The Metrys wordmark, set in a high-contrast swash serif.
A Metrys R160 Woltmann bulk water meter with a flanged blue body and a black register cap.
Woltmann bulk water meter, drawn illustration

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A Metrys R160 Woltmann bulk water meter with a flanged blue body and a black register cap.
Woltmann bulk water meter, drawn illustration

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Water meters WP-R160

R160 Woltman Water Meter

A flanged Woltmann meter for bulk lines, DN50 to DN200.

Nominal size
DN100
Q3 permanent flow
160 m³/h
R value (Q3/Q1)
160
Accuracy class
2

Select nominal size (DN)

Specifications update with the selected size.

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

  • R160 turndown

    Accuracy holds from Q3/160 upward, so the low night flow on a district line still registers instead of passing unmeasured.

  • Sealed to IP68

    The register is hermetically sealed, which is what keeps a meter readable after a chamber has flooded.

  • Removable measuring element

    The element is pattern approved and lifts out, so re-verification does not mean taking the body out of the line.

  • Reads from any angle

    The register turns through a full 360°, so the meter is set to suit the pipe and still faces the access hatch.

In detail

A Woltmann meter measures with a helical rotor set along the axis of the pipe rather than across it, which is what lets it take the volumes a bulk line carries. The R160 covers DN50 to DN200, with permanent flow rates from 40 to 630 m³/h, and connects by flange.

The R160 in the name is the turndown. The meter holds class 2 accuracy from a minimum flow of Q3/160 upward — ±5% between Q1 and Q2, tightening to ±2% from Q2 to overload. That range is the whole argument for the meter on a district line, where night flow is a small fraction of the daytime peak and a meter that stops registering at the bottom of its range is where unaccounted-for water begins.

The register is hermetically sealed to IP68 and turns through a full 360°, so the meter can be installed to suit the pipe and still be read from the access side of the chamber. The measuring element is pattern approved and removable, so re-verification does not mean cutting the body out of the line. The body is powder coated against corrosion, and the register is unaffected by external magnetic fields.

Installation is orientation-sensitive and the meter expects a settled flow profile: ten diameters of straight pipe upstream and five downstream. A remote transmission device can be fitted on request, with pulse output at 100 or 1000 litres per pulse.

Technical specifications

Selected size: DN100

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

Metrological

Nominal size DN100
R value (Q3/Q1) 160
Accuracy class 2
Register type Dry dial, hermetically sealed to IP68
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℃
Indicating range 999,999
Resolution of indicating device 0.0005

Hydraulic

Q3 permanent flow 160 m³/h
Q1 minimum flow 1 m³/h
Maximum working pressure 16 bar
Pressure loss class ΔP40
Q2 transitional flow 1.6 m³/h
Q4 overload flow 200 m³/h
Flow profile sensitivity class U10 D5

Environmental

Temperature class T30 / T50

Approvals

Standards ISO 4064

Dimensions and installation

Length 250 mm Height 245 mm
Schematic, not to scale
Connection thread Flange
Length 250 mm
Weight 16.8 kg
Orientation limitation Yes
Height 245 mm
Width 200 mm
Flange outside diameter 215 mm
Bolt circle diameter 180 mm
Connecting bolts 8 × M16

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, hermetically sealed to IP68

  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 R160 Woltman Water Meter.

Approvals and certificates

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View all Water meters

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