Go to content Go to main menu

Irrigation water meter Woltman WI-N

The WI-N water meter is designed fur use with heavily contaminated water, e.g. in agriculture, in sewage treatment plants or wastewater systems.

This field of application requires particularly robust meters that also function reliably under the most difficult conditions. Our irrigation meters guarantee this by positioning the measuring insert in the upper section of the pipe, where there is generally only a small number of suspended particles in the running water. The meter easily takes a level of impurity of up to 30% in its stride. Where there is very heavy contamination, external filters can be inserted upstream of the water meter. The factory-tested measuring insert is the same for all meter sizes and can be delivered with the following measurement accuracy:

Qmax-Qt: ± 3% (value class A+B)
Qt-Qmin: ± 5% (value class A)

The mechanical counter is completely encapsulated and hence protected against impurities. As standard, the meters are supplied with a lockable protective metal cap[nbsp] which acts as a dependable protection for the counter, even in harsh conditions. Reed pulser can be retrofitted at any time without damaging the calibration seal.

Pulser values for Woltman Meters*
DN 40 – DN 125 Standard 100 L/Imp.
DN 150 – DN 300 Standard 1.000 L/Imp.
DN 400 – DN 500 Standard 10.000 L/Imp.

(* other values on request)

Show more

Product images

Woltman Irrigation water meter WI-N
Woltman Irrigation water meter WI-NWoltman Irrigation water meter WI-NWoltman Irrigation water meter WI-N


Irrigation water meter Woltman WI-N


  • Water meter for polluted water or as a check meter in the fresh water area
  • Simple to maintain thanks to the removable measuring insert
  • Measuring accuracy conforms with Class A
  • Water meter for horizontal and vertical installation positions

Product options

AMR Technologies
  • Reed Pulser
Housing Material
  • Cast Iron (GGG)
Length without connectors
  • 200 mm
  • 225 mm
  • 250 mm
  • 300 mm
  • 350 mm
Measuring Principle
  • Woltman Irrigation Meters
Metrological Class horizontal (max.)
  • A
Nominal Diameter DN (mm)
  • DN 50
  • DN 80
  • DN 100
  • DN 125
  • DN 150
  • DN 200
Nominal Flow Qn
  • Qn 30
  • Qn 50
  • Qn 90
  • Qn 125
  • Qn 175
  • Qn 250
Operating pressure (max.)
  • MAP 16
  • Dry Dial
Specified Units on Display
  • Cubic Meters (m³)
  • Cold water up to 50° C


You can download a PDF Viewer from acrobat.adobe.com to view PDF files.

Other ZENNER products

Discover other interesting products in our product range.

Product imageSingle-jet bulk water meter ETK-N/ETK-MSingle-jet bulk water meter ETK-N/ETK-M
Single-jet bulk water meter ETK-N/ETK-M
With the single-jet ETK-N/ETK-M bulk water meter, ZENNER provides a meter for high flow rates with Class C measuring accuracy for municipal utilities companies, water suppliers and industry.
Product imageDirt filter for bulk water metersDirt filter for bulk water meters
Dirt filter for bulk water meters
Even under difficult conditions and where the water quality is poor, the dirt filters for our Woltman bulk water meters make reliable measurement results possible.
No image available.
Sensors for Woltman bulk water meters
Sensors for Woltman bulk water meters
All ZENNER Woltman type water meters can be retrofitted with reed contact, optical encoder or NAMUR induction encoder type active or passive pulsers.
No image available.
Honeycomb flow straightener
Honeycomb flow straightener
The honeycomb rectifier for bulk water meters ensures that the water enters the turbine of the water meter in an unimpeded flow pattern.