Water Meter Zenner Type WS-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.

The WS type Woltman meter will show its advantages during fluctuating flow rates. Since the turbine is arranged perpendicular to the pipe axis, there’s no need for a direction change of the transmission trough the worm gear to the counter. WS meters can achieve smaller starting values than WP meters through reduced friction.

The Hydrodynamic optimize turbine is reliably operated already at small flow rates and “upwards” it has enough power reserves to reliably measures flow rate peaks. Especially strong bearings with low friction guarantee a long life of the meter.

Retrofitting with active and passive pulsers is possible at any time without damaging the calibration seal. With the reed sensor, optical and inductive-NAMUR sensors all common sensor variations are possible and make the integration in data communication or automation in control systems very easy.


Performance characteristics in overview :

  • Removable measuring insert
  • Evacuated counter protected from condensation
  • Low starting flow and high measuring accuracy
  • Integrated filter made of stainless steel
  • Especially reinforced sapphire bearing
  • Hydraulic bearing relieve for long-term measuring stability
  • Dry dial counter with large number rollers simplifies the readability
  • Retrofittable with active and passive pulsers
  • High pressure model PN25/40 upon request
  • For cold water up to 30°C, with security up to 50°C
  • For horizontal installation position
  • Optional short installation lengths for DN 80 and DN 100 available


Technical Data :

Nomina Flow Qn : 15  m³/h

Nominal Diameter (DN) ; 50 mm

Overall length (L) : 270/300 mm

Metrological Class : B*H

Maximum Flow (Short-term) Qmax : 30 m³/h

Maximum Flow (Constant) : 20 m³/h

Transitional Flow : 1 m³/h

Minimum Flow Qmin : 0,15 m³/h

Flow rate with 0.1 bar head loss : 20 m³/h

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

Maximum temperature : 30°C

Operating pressure, max (PN) : 16 bar

Head loss at Qmax : 0,2 bar

Flange diameter (D) : 165 mm

Height : 228 mm

Weight : 14 kg


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