Wolman type water meters can be used for flow rates higher than Qn 15 m3/h. They are there by 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 thedry dial counter ensure the readability of the numbers at all times.
Similar to multi – jet meters, Wolman meters measure the velocity of the water flowing through with the help of a turbine. The volume is mechanically calculated, through the known volumeof the measuring chamber, and indicated with the roller counters in cubic meters. The unique from of the “paddle wheels” enable the Wolman meter to cover a veri large measuring range with especially low head loss. Aside from their contruction for high flow rates, they also reliably start measuring with small water quantities.
Active or passive sesors are available for communcation and control system 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/lmp. Reed sensors have a pulse value of 100 L/lmp. Up to 10 m3/lmp, depending on the meter size.
Well water meter are vertical Wolman meters with a special design of the body. The can be attahed as a wellhead in place of a 90°C elbow according to DIN 28537 and DIN 28637.
The body is especially designed for the conditions of a well construction. The well water enters at the underside of the meter, flows through the perpendicular standing values and offers enough the 90° elbow. The unique construction of our turbine ensures low starting values and offers enough reserves in the overload range for reliably measuring high flow rates. The coatingon the inside and outside reliably protects the meter from corrosion. Mineral in the water cannot affect the fully encapsulated dry dial counter.
Our design is ideally suited for narrow well shafts with small dimensions. An extra installation sport for a classical Wolman meter does not need to be planned.
Performance Characteristic in Overview :
- Removable measuring insert
- Pulser can be retrofitted without damaging the calibration seal
- Counter can turn 350°
- Operating pressure up to 16 bar
- For measuring a big range of flow rates
- High pressure design upon request
- For cold water up to 30°C (security up to 50°)
- For horizontal installation in place of 90° elbows according to DIN28537 and DIN 58637 respectively
Technical Data :
| Nominal Flow Qn | 15 m3/h |
| Nominal Diameter (DN) | 50 mm |
| Overal Length (L) | 270/300 mm |
| Metrological class | B*H |
| Maximum Flow (Short-term)Qmax | 50 m3/h |
| Maximum Flow (Constant) | 25 m3/h |
| Transitional Flow | 1.5 m3/h |
| Minimum Flow Qmin | 0.2 m3/h |
| Display range | min (1) max (9.999.999 m3) |
| Maximum temperature | 30°C |
| Operating pressure, max (PN) | 16 bar |
| Head loss at Qmax | 0.1 bar |
| Height (H) | 124 mm |
| Flange diameter (D) | 165 mm |
| Weight | 14.2 kg |