Address : Jln. Hayam Wuruk

Gedung Harco Glodok Lantai 5 Blok A No. 42

Jakarta Barat

Water Meter Zenner Type WI-N

Woltman type water meters can be used for flow rates higher than Qn 15 m³/h. They are thereby distinguished by ensuring an especially low head loss, even with high flow rates.

The newly developed measuring insert with a special construction of the turbine where the water flows through, guarantees a high measuring accuracy and long-term stability of the measuring results. Large number rollers on the dry dial counter ensure the readability of the numbers at all times.

Similar to multi-jet meters, Woltman meters measure the velocity of the water flowing through with the help of a turbine. The volume is mechanically calculated, through the known volume of the measuring chamber, and indicated with the roller counters in cubic meters. The unique form of the “paddle wheels” enable the Woltman meters to cover a very large measuring range with especially low head loss. Aside from their construction for high flow rates, they also reliably start measuring with small water quantities.

Active or passive sensors are available for communication with pulse counting modules or automation and control systems. Inductive NAMUR, optical, and Reed sensors can be retrofitted without damaging the calibration seal. Active sensors have a pulse value, depending on the meter size, of either 1 or 10 L/Imp. Reed sensors have a pulse value of 100 L/Imp. up to 10 m³/lmp, depending on the meter size.

Strong loaded water, for example in agriculture, wastewater treatment plants, or sewage works requires especially robust meters that are also working reliably under difficult conditions. Our irrigation meter achieve this by having their measuring insert arranged in the upper part of the pipe where, in flowing water, usually only few suspended particles are found. The meter can easily handle a load ratio of up to30%. We recommend an addition of external filters in front of the meter for very strong load.

The factory tested measuring insert is the same for all meter  sizes and is available in the following measuring accuracies :


Qmax-Qt: ±3% (Value Class A + B)

Qt-Qmin: ±5% (Value Class A)


The roller counter is fully encapsulated and therewith protected from impurities. The meters are serially available with a lockable metal protecting cover, which reliably protects the counter under rough conditions.

Retrofitting with active and passive pulsers is possible at any time without damaging the calibration seal. All common sensor variations are available with Reed sensors,optical and inductive-NAMUR sensors; the integration in data communications and automation and control system is therewith simple.


Performance characteristics in overview

  • Meter for loaded water or as a control meter for raw water
  • Easy to maintain through removable measuring insert
  • Measuring accuracy corresponding to Class A
  • For horizontal and vertical installation position

Technical Data :

Nomina Flow Qn : 30 m³/h

Nominal Diameter (DN) ; 50 mm

Overall length (L) : 200 mm

Measuring Accuracy : A

Maximum Flow (Short-term) Qmax : 100m³/h

Maximum Flow (Constant) : 70 5m³/h

Transitional Flow : 6 5m³/h

Minimum Flow Qmin : 2,4 m³/h

Display range : min (0,5) max (9.999.999 m³)

Maximum temperature : 50°C

Operating pressure, max (PN) : 16 bar

Flange diameter (D) : 165 mm

Height : 230 mm (H1), 75 mm (H2)

Weight : 11 kg

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