Wolman type water meters can be used for flow rates higher tahn 15 m3/h. They are threby 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, Wolman 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 from of the “Paddle wheels” enable the Wolman 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 measuringwith small water quantities.
Active or passive sensors are available for communiction 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/lmp. Reed sensors have a pulse value of 100 L/imp. Up to m3/lmp depending on the water size.
The Turbo Compound meter is a special Compound meters designed for measuring extreme fluctuating flow rates. The difference to the normal compound meter is that during periodical replacement the meter body can remain in the piping and only the calibrated measuring insert is interchanged. The main meter, the secondary meter and the spring loaded valve are all assembled on one plate. The periodical replacement is therefore simple, quick and cost-effective.
The main meter is designed as a Parallel Wolman meter, the secondary meter is a multy-jet measuring cartridge. Only a body where the secondary meter is arranged on the right side. Is available in order to determine the meter reading, like with the classic. Compound meters, the meter reading of the main and the secondary meter need to be added.
Reed sensor, optical and inductive-NAMUR sensors can always be amounted on the counter of the main meter without damaging the calibration seal on the counter. The secondary meter measuring cartridge is serially retrofittable and can be easily retrofitted with a and automation and control system is there with simple.
Performance Characteristics in Overview
- Interchangeable calibrated measuring insert consisting of main meter, spring loaded valve, and secondary meter
- Body remains in the pipeline during interchange of measuring insert
- Prevention of devosits, dead water or air pocket accumulation through special construction
- No measurement errors in the communication range
- For cold water up to 30°C (secure up to 50°C)
- For horizontal installation position
- Secondary meter at the right side of the main meter
Technical Data :
| Nominal Flow Qn | 15 m3/h |
| Nominal Diameter (DN) | 50 mm |
| Nominal flow secondary meter (Qn) | 2.5 m3/h |
| Overal Length (L) | 270/300 mm |
| Metrological class | B |
| Maximum Flow (Short-term)Qmax | 90 m3/h |
| Maximum Flow (Constant) | 35 m3/h |
| Transitional Flow | 0.0375 m3/h |
| Minimum Flow Qmin | 0.02 m3/h |
| Communication flow rate | increasing (2,2 m3/h), decreasing (1.0 m3/h) |
| Flow rate with 0.1 bar head loss | 1.8 m3/h |
| Maximum temperature | 30°C |
| Operating pressure, max (PN) | 16 bar |
| Head loss at Qmax | 0.5 bar |
| Flange diameter (D) | 165 mm |
| Weight | 17.4 kg |