BONEGA® Antimagnetic Water-Meters and Accessories  

User’s and technical advantages: High Accuracy and Sensitivity

With their sensitivity and accuracy, the BONEGA^® water-meters contribute to a more equitable clearing of water consumption significantly. They reduce the differences in measurements between the base of a building and the sum of household water-meters. Nowadays, it is one of the most accurate household water-meters worldwide.

1.  Very high measurement accuracy

After a thoroughly done quality comparison of four best selling dry-running water-meters in the Czech Republic, we have been assessed as the best ones. The tests compared mainly the measurement accuracy, the starting flow-rate, the sanitary requirements etc.

Source: VaK, 2004

Division of water-meters according to the accuracy

According to the measurement accuracy, the water-meter are divided into the A, B and C classes – the A class is the least accurate, the C class the most accurate. In general practice, the water-meters of the “B” class or of the “A” class are installed at the flats almost exclusively. The water-meters of the “C” class are seldom used because of their high price.

All the BONEGA®water-meters are involved into the “B” class, but their parameters come very close to the most accurate “C” class, whereby they surpass a lot of competitors. The metrological stability of the BONEGA water-meters is given mainly by their suitable construction of turbines and both regulating units.

How can you recognize, within which accuracy class does our water-meter measure?

Every manufacturer is obliged to mention the accuracy class on the dial (in the horizontal and vertical position - see the detailed description below).

The proofs on measurement accuracy can be found in the Certificates of Calibration .

The differences between the metrological classes are even multiple (see the Table). In addition, there exist, however, very significant differences between water-meters within the same class.

Chart of the measurement accuracy behavior in individual flow-rates:

• the measurement deviation in the whole range from Qmin to Qmax only within +/- 2% (CSN allows the tolerance of up to +/- 5%)
• as resulting from the aforementioned, even an officially verified water-meter can measure with a 5% difference and increase the difference in measured values between the base water-meter and the household water-meters.
   

Key: Qmin = minimum flow-rate (l/h), Qt = transient flow-rate (l/h), 0,2 Qn = 20 % of nominal flow-rate (m3/h), 0,3 Qn = 30 % of nominal flow-rate (m3/h), 0,5 Qn = 50 % of nominal flow-rate (m3/h), Qn = nominal flow-rate (m3/h), Qmax = maximum flow-rate (m3/h)

The higher is the measurement accuracy, the higher is the probability that the difference in measured values on the base water-meter and in the sum of household water-meters will be minimum.
 

Those proofs can be read in the EHS Certificates, Decision on Approval of the TCM meter and Certificates of Calibration.

2. Accuracy class “B” in both positions

The BONEGA^® water-meters reach the accuracy class “B” in both installation positions, as ones of the few in Europe. This extraordinary advantage can be reached through a suitable construction of the bottom (wet) part of the water-meter.

Concrete improvement:

• a very precise seating of the turbine in two bearings (only one is usually used)

• the bearings are made of agate

• the water-meter includes not only the upper, but also the bottom regulating board
   

Is it known that the water-meters seated in the vertical installation position usually show the worse measurement accuracy than in the horizontal position (the turbine bedding has the biggest influence thereon.)

With which accuracy does your present water-meter measure?

Every manufacturer is obliged to mention the accuracy class on the dial, separately for the horizontal (“H”) and the vertical (“V”) positions. At the older water-meters, you can find only one-letter designation (the same class in both positions) which does not comply with the European requirement more.

The most water-meters available on the market, have usually the B class (H-B) for the “H” position and the worst A class (V-A) for the “V” position. Generally, if a water-meter has a higher accuracy class in the most demanding vertical position, it will be even more accurate in its horizontal position.

For example:

a) If B-H A-V is mentioned on a water-meter, it means that the water-meter has the worst A class in its vertical position and the B class in the horizontal position. The most water-meters used in Europe have this design.

b) If only the A letter is mentioned on a water-meter, it means, that the water-meter reaches only the worst A measurement accuracy in both installation positions,

The proofs on very high measurement accuracy of the BONEGA® water-meters can be found for the B class in both installation positions in the measurement results (see Certificates & Declarations) and in the EHS Certificates, Decision on Approval of the TCM meter.  

Compare the accuracy of the BONEGA^® water-meters with other brands.

3. Very high sensitivity for measurement start (starting flow-rate)

Another very important parameter of the water-meter accuracy is at what real minimum flow-rate (not at Qmin specified by the standard) the counter begins to rotate evenly (not by jerks) and thus to register the water flow.

If does not concern the minimum flow-rate Qmin, stated by the standard.

The minimum flow-rate, stated by the standard, for ½” water-meters for the B class amounts to 30 liters per hour.
The A class permits even up to 60 liters per hour (see measurement accuracy in installation positions)

Simply said:

If 29 liters per hour drop (consciously or unconsciously) by an end user, his water-meter might not register it at all, even if it is involved within the B class. Annually, the volume of not-registered water can amount up to 254 040 liters = 254 m3. It corresponds to 516 840 liters for the A class (59 liters per hour) annually.
 

Unfortunately, some end users misuse this phenomenon consciously whereby unfair differences in clearing among the consumers appear.

An unconscious non-registration of the flow-rate appears at the water-meters of low quality, always in the first stage of water flow or when the water inlet is closed (which happens many times a day) and also if the valves are not tightened (water dropping).

The BONEGA^® water-meters show extraordinary values also with the above parameter.
 

The real starting flow-rate of the BONEGA® water-meters is below 8 liters per hour.

- within the range of 5 – 8 liters, thus even better than required by the C class (min. 15 l/h).
We thus guarantee better parameters for the response to start (sensitivity), than those specified by the highest class.

4. High reliability

The reliability is given especially:

• by a suitable choice of materials
• by a high manufacturing precision
• by a thorough output inspection
• by gauging according to EHS including the pressure test

5. Protective, opaque, plastic cover with removable lid

The upper part of the water-meter is equipped with a removable lid which protects the transparent plastic reading area of the dial against impurities (which is usual especially in technological shafts) The lid is fastened so that the hinge is always in the upper position of the dial The removable lid is locked in its upper position which facilitates the readings even on a vertically seated water-meter The entire outside cover is undemountably connected with the transparent cover of the device.

6. Easy and through reading

7. Surface anticorrosive protection

The water-meter body is nickel-coated whereby the surface corrosion is avoided The nickel-coated surface is also an aesthetical element underlining the modern design If the products are made just of brass, they become dark unevenly, especially in wet environment (real “stains” occur on the surface)

8. Guaranteed suitability for use for healthy reasons

• Only the outside part is nickel-coated. The inside part must not be nickel-coated because nickel could be released to drinking water. Unfortunately, not all manufactures respect this rule.
• The brass composition complies with the sanitary requirements
• For more details, please read the Sanitary Testimonial

9. Plastic sieve at the inlet

10. Light run

• The blade wheel is bedded on a stainless shaft in an agate bearing

• It has a very good influence on the lifetime and the exact measurement behavior within the entire guaranteed period between “re-gaugings”

11. Easy fastening against rotation during the installation

It is not necessary to use complicated installation tools Fastening against water-meter rotation during screw-joint installation is possible by means of an open wrench No. 21 It avoids the counter to be damaged during the installation (breaking-off the securing ring or seal damage), thus to be “re-gauged” at a high rate     ¨

12. Auxiliary scale

Faster calibration It facilitates the adjustment in repair shops and calibration facilities The scale is marked with “O” in the middle and on the left with “-“, on the right with “+” with symmetrical slots   ¨

13. High DURABILITY

• against increase pressure in supply line up to 1,6 MPa
• against outside mechanical loading (especially if compared with the plastic ones)
• against corrosion thanks to a suitable choice of quality materials (copper content)
• against abrasive wear

14. Remote readings

• The BONEGA^® water-meters enables an additional easy conversion to remote readings
• The company TRASCO uses, installs and sales our water-meters for remote readings:

TRASCO, spol. s r.o.
1. Máje 1000, Rožnov pod Radhoštěm
phone 571 845 484
mobile 777 141 045, 603 517 342
fax 571 842 284
www.trasco.cz 
email [email protected] 

15. Pulse measurement option

The middle photometric disc (rose) with a hole enables the pulse measurement The pulse number for nominal flow-rate Qn 1,5 m3/h for 1/2" water-meters is 1125,00 rev./100 l The pulse number for nominal flow-rate Qn 2,5 m3/h for 3/4" water-meters is 712,74 rev/100 l   ¨

16. Renovation of water-meters

The renovations are done obligatory after 4 years on the warm-water water-meters and after 6 years on the cold-water water-meters. The purpose is ensuring accuracy and eventual repair.
 

We provide the renovations:

1. by an exchange of a piece against a piece
2. only by renovation

These renovations are done mainly by our contractual workshop - Brněnské vodárny a kanalizace a.s. Thanks to high quality materials, it is usual enough to clean our water-meters thoroughly and to replace the O-ring. Upon wish, we will provide you with the other contacts to the service workshops in both the Czech and Slovak Republics.

Please see: Confirmation about repairing and calibration from BVK

Recently, we can notice that the repairs (renovations) after 4 or 6 years do not pay off more (as it is in Western Europe). The used water-meters are replaced by the new ones. The household water-meters become“short-time” utility goods.

17. Clearing of water consumption and installation

Within the Czech and Slovak Republics, we are able to ensure both the installations, and the clearings of water consumption or other utilities by means of verified renowned companies.

We provide the completed service, such as:

• purchase of old water-meters
• renovations of used water-meters with following “re-gauging”
• dismantling and installation of new or renovated water-meters
• readings of water consumption
• statement of consumption and its transmission to the form of invoice
• data transmission to other bookkeeping and evidence systems
• clearing of not only water consumption, but also of heat and other utilities
• etc..

18. Training

Within the Czech and Slovak Republics, we offer training for installation and engineering companies.

19. Long lifetime

The usage of quality materials is a warranty for long lifetime. The water-meters are suitable even for multiple renovations.

20. Service and spare parts

Within the service, we offer also:

• guarantee and post-guarantee service
• purchase of any old water-meters
• spare parts deliveries from our sufficient stocks

The spare parts delivered for the BONEGA household water-meters:

Diagram of the water-meter

1) Nickel-coated brass body
2) Turbine + magnet + spindle + ruby bearing
3) Main shaft (spindle) made of stainless steel
4) Bottom regulating board
5) Upper regulating board with ruby bearing
6) Tightening "O"-ring underneath the upper regulating board
7) Plastic sieve
8) Delimitating plastic ring
9) Brass securing nut
10) "O"-ring for counter tightening
11) Separate transparent lid
12) Removable protective plastic lid
13) Counter device
14) Securing ring