It is a sad true that there are still a lot of unfair tenants who try to misuse the technical imperfections of some water-meters, and thus to affect the relating measurement accuracy. In this way, they prey other users and simultaneously, they create disputes with clearing.
Therefore, we have placed a lot of unique protective elements against misuse onto our BONEGA® water-meters. Those elements contribute to a more objective ratio measurement of water consumption in a household.
Only few manufacturers can be proud of so high resistance.
If no water flows through the water-meter, the turbine is stopped whereby it puts up a resistance. The counter rotation “in the right direction” causes the reverse run of the turbine, thus the aforementioned subtraction (the magnetic couple avoids the rotation of the main shaft at the counter). Many users succeeded in mechanizing it whereby they reach even some tens revolutions per minute.
To keep the possibility of an easy reading, avoiding the
subtraction at the same time we have developed a gear that enables just limited
rotation (670 degrees).
The easy solution consists in the innovated securing ring combined with a lug on the bottom brass part of the water-meter and with press-pieces on the side cover. The transparent polycarbonate cover and the opaque side cover are bounded undemountably.
According to the available information, the BONEGA® water-meters are the only ones that have the aforementioned protection.
As to the antimagnetic resistance, we supply the BONEGA® water-meters in two designs:
The difference consists in inside construction modifications that increase the antimagnetic shielding (antimagnetic resistance) significantly. It concerns de facto the internal antimagnetic cage, which consists of two specially modified inter-rings with high weight and size (see Fig.)
These modifications are done since a lot of unfair tenants try to affect the water-meters by means of magnets.
In the beginning, it has to be mentioned that thanks to higher reliability, dry-running water-meters are used almost solely at the flats.
On these water meters, the bottom part is not connected with the counter
mechanically – by a shaft (as it is on the wet-running water-meters) but by a
magnetic coupling. No seepages or even bigger water leakages through the upper
regulating board menace (as it can be in the case of gasket wear and tear around
the shaft on the wet-running types). On the dry-running water-meters, a pair or
a tetrad of permanent magnets placed in the shaft usually ensures the motion
transmission from the shaft to the counter. Opposite in the bottom part of the
main shaft, there is usually another pair or tetrad of permanent magnets. As
soon as the turbine starts to rotate, its magnets – under influence of magnetic
forces – begin to “tear down” the magnets on the main shaft whereby the rotating
motion of the shaft is transmitted onto the counter.
The most often misuse consists in application of permanent or other outside
source of magnetism. After having been applied to the water-meter, it disturbs
the magnetic field. In that case, the saccade or even the fully stop of the
counter occur although the turbine still rotates.
The manufacturers struggle to avoid the aforementioned phenomenon by means of various antimagnetic modifications. They show usually themselves on the higher bottom body, the protective cage inside a water-meter, thus they result in a no small increase in water-meter weight. For example, the weight difference between a ½” normal and antimagnetic BONEGA® water-meter amounts to 15 g.
It is an all-European problem that is proven by the European Union interest lasting several months. The European Union prepares the relating standard (EN 14 154-3) in which the required minimum resistance is mentioned at the rate 10 kA/m. There has not been stated any exact methodology yet, how this parameter can be measured exactly.
How can you find out that the water-meters have the above protective
ability? How can you measure that resistance? Which are the differences in this
resistance between the individual water-meter manufacturers?
We put these questions to ourselves some years ago. Because the aforementioned standard is in the draft stage but the customers need to know the exact resistance, we have chosen the above solution.
The original used methodology was based on applying the permanent magnets to the water-meter. It was very difficult to define the parameters of such a magnet. Only a very inexact dimensional comparison was often used.
In 2003, we placed an order with the Slovakian Technical University in Bratislava to develop an as exact as possible measurement methodology based on the stepless control of magnetic flow which shall determine the value in kA/m exactly when a water-meter begins to measure (saccade of the counter), and the value when the measurement is fully stopped.
Our basic preconditions:
1. To create a methodology for stepless measurement of the water-meter antimagnetic resistance which have to:
2. To choose three best water-meters for the selection, based on our 12 submitted constructional varieties of antimagnetic modifications for the BONEGA® water-meters
3. To do the comparison with a water-meter without antimagnetic modification, with a zero primary variety of an antimagnetic modification and with three varieties of the selection.
4. This measurement has to result in a recommendation for the best antimagnetic modification suitable for mass production.
After corresponding constructional modifications and tests, we have fulfilled our objective: to offer a household water-meter which is as resistant as possible in its magnetic properties and which has to withstand at least a pair of the biggest ferrite permanent magnets available on the market.
The BONEGA® water-meters exceed
of the European standard by up to 1300 %.
Úprava má jen zanedbatelný dopad na zvýšení ceny.
Nowadays, we have appeared on the imaginary top of water-meters with the highest antimagnetic resistance.
The modification has only an insignificant affect on the increase in price. An additional and very expensive modification by the outside magnetic cage is not necessary more.
|Comparison of parameters:|
|Type of BONEGA® water-meter||Distance of the action of magnet from the water-meter||Value in the standard draft EN 14154-3:2005+A1||Resistance of the BONEGA® household water-meters||We exceed the values in proposed standard EN 14154-3:2005+A1 by
|We exceed the values in proposed standard EN 14154-3:2005+A1 in multiples|
|Normal version (S/T)||20 mm||10 kA/m||Up to 16 kA/m*||Up to 160 %||Up to 1,6 times|
|Antimagnetic version (SA/TA)||20 mm||10 kA/m||94-130 kA/m*||940 - 1300 %||9,4 times to 13 times|
*according to the water-meter position
The Declarations on antimagnetic resistance are available for download under Certificates and declarations.
The Protocol on measurement is also available on a separate page because of its volume.
The other possibility how to put a water-meter out of operation is to bore the dial cover on the side and to put an object through it, which locks the counter run. To choose the right place you have to see in –it is enabled by a transparent cover on other water-meters. This mechanical intervention is irreversible but unfortunately mostly little visible.
The BONEGA® household water-meters have a side cover which is
opaque and irremovably connected with the transparent cover of the device. It
protects the counter device in mechanical and optical way.
Due to an unsuitable sealing, some water-meters can be dismantled or rotated by 180° without following recognition. The plastic pins can be “desealed” and again “sealed” with certain temperature, the copper wires can be drag out and string with a little practice.
Therefore, the return to traditional sealing with copper strands is recommended in the last time. The strand is to be drawn through the hole in the screw joint nut and through the sealing hole on the water-meter body. The ends are drawn through a lead sealing which closes and secures the strand ends against dragging out. After that, the registered mark is embossed into the sealing. To do this, the water-meter has to be adapted correspondingly.
The water-meter is protected with a security ring with a seal avoiding the separation of the counter from the bottom part and therefore it is not possible to interrupt the continuous counting of water consumption, as it is possible with some water meters.
Export Manager: Ing. Michal Hudeček, [email protected]