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.
This has been developed for very precise recording of amounts of water, above all in the starting range. Combined with a wide load range, this type of meter is used either for highly precise measurement of highly variable flow rates or as an alternative to the classic combination meters, with main and secondary meter.
In contrast to Woltman meters, the ETK-N/ETK-M does not require an inlet zone, since, as a single-jet meter, it is insensitive to swirling flows. Approved for horizontal installation position, this meter type is very flexible to use and can be an alternative in almost all areas of application of the classic combination meter.
Our new ETK-N-C is a meter suitable for high flow rates with measuring accuracy of class C.
Developed for the very exact measuring of water amounts, especially in the starting flow range, combined with a wide load range, this meter type will be used either for the highly accurate measuring of strongly fluctuating flow rates amounts, or as an alternative to the classic Compound meters with main and secondary meters.
The inflowing water is accelerated according to the venturi-principle at the inlet and tangentially hits the turbine wheel. Thereby extremely low starting values can be attained with simultaneously high overload guarantee. In the starting flow range similar to a secondary meter of a WPV, it has sufficient reserve in the upper floe range to be capable of accurately measuring very high flow rates.
Performance characteristic in overview
- Can be retrofitted with pulsers
- Turnable counter
- Good long-term measuring stability
- Wide measuring range
- High accuracy in the lower measuring range
- Coated body-optimal protection
- High overload security
- For vertical and horizontal installation
- For cold water up to 30°C (secure up to 50°C)
- ETK-N retrofitable with Reed pulser (100 L/Imp.)
- ETK-M retrofitable with electronic pulser (100 L/Imp.)
- Rotatable counter
- Good long-term measuring stability
- Large measurement range
- Highest accuracy in the lower measuring range
- Coated housing – optimum protection
- Good overload protection
- Water meter for horizontal installation position
- For cold water up to 50° C
- Approved in Accordance with MID
Technical Data :
Nomina Flow Qn : 15 m³/h
Nominal Diameter (DN) ; 50 mm
Overall length (L) : 270 mm
Metrological Class : B*V
Maximum Flow (Constant) : 30 m³/h
Transitional Flow : 0,225 m³/h
Minimum Flow Qmin : 0,09 m³/h
Flow rate with 0.1 bar head loss : 11 m³/h
Display range : min (0,5) max (9.999.999 m³)
Maximum temperature : 50°C
Operating pressure, max (PN) : 16 bar
Head loss at Qmax : 0,8 bar
Flange diameter (D) : 165 mm
Height : 180 mm
Weight : 11,8 kg