Wolman 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 meter flows through, guarantess a high measuring accuracy and long term stability of the measuring result. Large number roller on the dry dial counter ensure the readability of the number at all times.
Similar to multi-jet meters, Wolman meters measure the velocity of the water flowing through wit the help of a turbine. The volume is mechanically calculated, through the known volume of the measuring chamber, and indicated with the roller counter in cubic meters. The unique from of the “paddle wheels” enable the Wolman meters to cover a vey 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 pilse 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/Imp, depending on the meter size.
Wolman Meter Parallel Turbine Shaft
Wolman parallel type meters are always used when high flow rates with a relative constant flow rate profile are to be measured. Through its robust construction they not only are capable of covering a large measuring accuracy is also long-term stable.
The hydrodynamic optimize turbine is reliably operated already at small flow rates and “upwards” it has enough power reserves to reliably measure flow rate peaks. Especially strong bearing with low frition guarantee a long life of the meter.
Reed sensors, optical and inductive-NAMUR sensors can always be retrofitted without damaging the calibration seal. Then the meter can be integrated with data communication or automation and control systems in a simple and flexible way.
Performance characteristics in overview
- Low starting flow, high overload security
- Wide measuring range
- Removable measuring insert
- Low head loss
- Hydraulic bearing relieve for long-term measuring stability
- Retrofittablewith active and passive optional
- Metal protective cover serially, plastic optional
- Evacuated counter protected from condersation
- Dry dial counter with large number roller simplifies the readability
- For cold water up to 30°C. with security up to 50°C
- For horizontal, vertical and inclined installation position
- High pressure model PN25/40 upon request
Technical Data :
| Diameter Flow Qn | 60 m3/h |
| Nominal Diameter (DN) | 100 mm |
| Overal Length (L) | 250 mm |
| Metrological class | B |
| Maximum Flow (short-term) Qmax | 250 m3/h |
| Maximum Flow (Constant) | 125 m3/h |
| Transitional Flow | 4.8 m3/h |
| Minimum Flow Qmin | 1.5 m3/h |
| Flow rate with 0.1 bar head loss | 100 m3/h |
| Head loss at Qmax | 0.2 bar |
| Display range | min (2) max (9.999.999 m3) |
| Maximum temperature | 50°C |
| Operating pressure, max (PN) | 16 bar |
| Height (H) | 275 mm |
| Flange diameter (D) | 220 mm |