BONEGA® Antimagnetic Water-Meters and Accessories  

Protective Elements against Water-Meter Interference or Locking

List of content
1. Blocking against endless rotation 
2. Unique antimagnetic resistance
3. Protective opaque side plastic cover
4. Input screw joint sealing
5. Counter sealing
Other information


Protocol on examination

Relative information:

All products and services

Technical parameters

User’s and technical advantages

Sale advantages

Application, warehousing, maintenance and installation

Guarantee terms

Information on claims

Certificates & declarations



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.

Přehrát animaci1. Blocking against endless rotation (subtraction to minus)

Easy reading, no subtraction.

The endless rotation of the water-meter’s counter was developed originally because of an easy tracing of the counter’s condition in various installation positions. At the most water-meters, this rotation can be, unfortunately, misused for subtraction to minus.

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.


2. Unique antimagnetic resistance

The BONEGA® water-meters withstand even a pair of the biggest permanent magnets available on the market.

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.

Detailed explanation

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.

Range of the problem

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.

Methodology of the antimagnetic resistance measurement

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 the requirements
of the European standard by up to 1300 %.

Influence on price

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.

Difference between the BONEGA® water-meters with the antimagnetic resistance and without it

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.


3. Protective opaque side plastic cover

Are you sure that nobody digs into your water-meters?

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.


4. Input screw joint sealing

Are you sure that your water-meters
cannot be rotated by 180° ?

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.

Water-meters BONEGA®


5. Counter sealing

The upper and bottom parts cannot be separated,
so the counting cannot be interrupted.

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,

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BONEGA spol. s r.o. Sudoměřice nad Moravou 302, tel. ústředna: 518 335 333-5, tel.: 518 335 216