333/2000 Sb.
The DECREE
The Ministry of industry and trade
of 6 December. September 2000,
laying down the requirements for water meters for hot water called
the EEC
Change: 260/2003 Coll.
The Ministry of industry and trade shall determine in accordance with section 27 of Act No. 505/1990
Coll. of metrology, as amended by Act No. 119/2000 Coll. (hereinafter the "law")
for the implementation of section 6 (1). 2 and § 9 (2). 1 of the Act:
§ 1
This Decree lays down the requirements for water meters for hot water (hereinafter referred to as
"meters"). For the purposes of this Ordinance be deemed warm water, if it is
its temperature exceeds 30 ° C, but does not exceed 90 ° C.
§ 2
Water meters can be instead of the designation of the official marks laid down
special legal regulation ^ 1) marked with the mark of EEC type-approval, and
the initial EEC verification, whose graphic design provides for a specific legal
prescription, ^ 2) only if they meet the requirements set out in the annex to this
the decree and which was verified by the procedures laid down in the specific
legislation. ^ 2)
§ 3
This Decree shall take effect on the date of publication of the sectoral annex for
the gauge to the Protocol to the Europe Agreement establishing an association between the
The Czech Republic on the one hand, and the European communities and their
the Member States of the other part, on conformity assessment and acceptance of
industrial products in the collection of international treaties, or on the date of entry
the Treaty of accession of the Czech Republic to the European Union,
If the day earlier.
Minister:
doc. Ing. Gregr in r.
Annex.
The meters requirements
1.
TERMINOLOGY AND DEFINITIONS
This annex applies only to meters that work purely on the mechanical
principle. Such meters either use volumetric Chambers with moving
walls, or use the action of the velocity of the water on a bladed rotor
(radial or axial turbine). This annex shall not apply to water meters
equipped with electronic components.
1.1 Flow
Flow is the volume of water passing through the meter per unit time.
1.2 volume delivered
Volume delivered is the total volume of water that has passed through the meter for a given
period of time.
1.3 Maximum flowrate (Qmax)
Maximum flowrate, Qmax, is the highest flowrate at which the meter must be
able to function over limited periods without damage, and without
exceeding the maximum permissible errors and the maximum permissible value
loss of pressure.
1.4. Nominal flowrate (Qn)
Nominal flow Qn, is equal to half the maximum flowrate, Qmax. This
the flow rate is expressed in cubic metres per hour and is used for
indication of the meter.
At the nominal flowrate, Qn, the meter must be able to function in normal
use, i.e.,. for continuous and intermittent operating conditions, without
you have exceeded the maximum permissible errors.
1.5 the minimum flowrate (Qmin)
The minimum flow Qmin is the flowrate above which the value must not be
exceeded the maximum permissible errors and that is firmly established as a
a function of qn.
1.6 the flowrate range
The flowrate range of the meter is bounded by the maximum and minimum flowrates,
Qmax and Qmin. This range is divided into two regions, known as
the top and bottom, with different maximum permissible errors.
1.7. Transitional flowrate (Qt)
The transitional flowrate, Qt, is the flowrate which divides the upper and lower range
flow and in which become discontinuous, the maximum permissible error.
1.8. Maximum permissible error
The maximum permissible error is the error of the meter allowed for
EEC type-approval and the initial EEC verification pursuant to this order.
1.2 pressure loss
Loss of pressure means the loss which is caused by the presence of a water meter
in the pipeline.
2.
METROLOGICAL CHARACTERISTICS
2.1. Maximum permissible errors
The maximum permissible error in the lower range from Qmin inclusive to Qt
(except) is +/-5%.
The maximum permissible error in the upper range from Qt inclusive to Qmax
(including) is +/-3%.
2.2. Metrological classes
Water meters are divided according to the values of Qmin and Qt defined in
the four metrological classes in the following table:
+---------------------+---------------------------+
| Class | Qn |
+---------------------+--------------+------------+
| | < 15 m3/h | > = 15 m3/h |
+---------------------+--------------+------------+
| Class A | | |
| The value of Qmin | 0.04 Qn | 0.08 Qn |
| Value of Qt | 0.10 Qn | 0.20 Qn |
+---------------------+--------------+------------+
| Class B | | |
| The value of Qmin | 0.02 Qn | 0.04 Qa |
| Value of Qt | 0.08 Qn | 0.15 Qn |
+---------------------+--------------+------------+
| Class C | | |
| The value of Qmin | 0.01 Qa | 0.02 Qa |
| Value of Qt | 0.06 Qn | 0.10 Qn |
+---------------------+--------------+------------+
| Class D | | |
| The value of Qmin | 0.01 Qa | |
| Value of Qt | 0.015 Qn | |
+---------------------+--------------+------------+
3.
TECHNOLOGICAL PROPERTIES
3.1 Construction-General provisions
The meter must be constructed in such a way that under normal
conditions of use:
and) give long service and guarantee proof against fraudulent
handling,
(b)) conform with the provisions of this order.
Where meters may be subjected to an accidental reversal of flow,
This change must be able to withstand, without damage, and without the adverse
impact on their metrological properties, and at the same time, this must return
flow record.
3.2 Materials
The meter must be made of materials of adequate strength and stability
correspond to the purpose for which it will be used. The meter must be completely
made from materials that are resistant to internal and normal external
corrosion, and, if necessary, must be equipped with a suitable surface treatment.
Changes of water temperature in the range from 0 to 110 ° C must not adversely
affect the materials used for the manufacture of the meter.
3.3-pressure Tightness tightness and temperature resistance
The meter must be able to indefinitely, while maintaining the correct
functions, without layoffs, leaking walls and permanent deformation of the stand
continuously applied on the value of water temperature of 90 ° C and continuously applied
pressure for which it is designed, termed the maximum operating
pressure. The minimum value for this pressure is 1000 kPa (10 bar).
3.4 pressure loss
The value of the loss of pressure is ascertained during EEC pattern approval examination
type; This value must not exceed 25 kPa (0.25 bar) at the nominal
flow and 100 kPa (1 bar) at the maximum flowrate.
On the basis of the results of the tests are graded into four groups the meters according to the
whether their pressure loss at maximum flowrate does not exceed the
one of the following values: 100; 60; 30 and 10 kPa (1.0 0.3 and 0.6;;
0.1 bar). The jurisdiction of the meter to one of these groups must be given to the
EEC type-approval certificate.
3.5 the indicating device
The indicating device must make it possible, through a simple and easy
juxtaposition of its various parts, reliable, easy and
unambiguous reading of the volume of water measured, expressed in meters
cubic.
This volume is given one of the following options:
and location) of one or more pointers on circular scales;
(b)) by displaying a series of consecutive digits in one or more of the
the holes,
(c)) the combination of these two systems.
The cubic metre and its multiples are shown in black, and parts of the meter
cubic are in red.
Optical height of the figures must not be less than 4 mm.
On digital indicators types b and c)) visible displacement of all must be
numbers vertically upwards. The offset of any digital unit must be
completed at the time of the next lower decade changes from 9 to
0; the roller showing the least significant digit can u type c)
move continuously. Complete the number of cubic metres must be clearly
marked.
Indicators with pointers and type), and (c)) must rotate in the direction
clockwise. The value for each scale in metres
cubic must be expressed as 10En, where n is a positive or negative
whole number or zero, thereby establishing a system of consecutive decades. In
near each part of the scale shall be displayed information, such as: x
1000 x 100 x 10 x 1 x x 0.1 0.01 x 0.001.
In both cases (dial and digital indicators):
-the unit symbol m3 must be shown either on the dial or in the
the immediate vicinity of the digital indication,
the fastest-moving and visually readable graduated element (
"the control element") must move continuously; his piece is known as the
the verification scale interval. Control element may be permanent or may be
created temporarily by adding detachable parts. These parts must not have
significant influence on the metrological characteristics of the meter.
The length of the verification scale interval shall not be less than 1 mm and not
greater than 5 mm. Scale must contain:
-either the markup of the same width, which is not more than one quarter of the
the distance between the axes of two adjacent marks that differ only in their
length,
-or of contrasting bands of a constant width equal to the length of the
the verification scale interval.
3.6 the number of digits and the value of the verification scale interval
The indicating device must be able to record without returning to zero
the volume, expressed in cubic metres, which corresponds to at least 1 999
the hours of operation at the rated flow.
The value of the verification scale interval must be 1 x 10En or
2 x or 5 x 10En 10En. This size must be during authentication
small enough to ensure that the measurement inaccuracy of not more
than 0.5% (allowing for a possible reading error of not more than
half the length of the smallest scale interval) and that at the minimum flowrate
the test did not take more than 1 1/2 hours.
It is possible to add a supplementary device (Star, disc with a reference
mark, etc.), in order to show the movement of the measuring device before
It will be clearly visible on the indicating device.
3.7 adjustment device
The meter may be equipped with an adjustment device with which it is possible
change the relationship between the volume indicated and the volume actually
passed. This device is compulsory for meters which make use
the action of the velocity of the water on a bladed rotor.
3.8. Accelerating device
The use of an accelerating device for increasing the speed of the meter below Qmin
It is prohibited.
3.9 Additional equipment
The meter may incorporate a device for generating pulses, provided
that such equipment does not affect adversely its metrological properties.
EEC type-approval certificate may allow supplement specially
fixed or removable devices, which allow the automatic
verification of the meter.
4.
MARKS AND INSCRIPTIONS
4.1 Identification inscriptions
For all the meters is mandatory to bear in legible and indelible
the form of the following information, either separately or grouped together on the
the meter casing, on the dial indicator or on the information plate:
and the name of the manufacturer) or the trade name or mark,
(b)) the metrological class and nominal flowrate Qn in m3/h,
(c)) the year of manufacture and the serial number,
(d)) one or two arrows showing the direction of flow,
(e)) EEC type-approval mark,
(f)) the maximum operating pressure in bar, if greater than 1 000 kPa (10
bar),
(g)), the maximum operating temperature in ° C,
(h)), the letter "V" or "H" If the meter can operate properly in the
vertical (V) or horizontal (H) position.
4.2 location of the initial EEC verification marks
For the initial EEC verification marks must be on (mostly
on the meter casing) instead, which is visible without disassembly
the meter.
4.3 Sealing
The meter must be equipped with protective devices, which can be sealed
in such a way as to ensure that the correct installation of the meter before
and it will not be possible, the meter itself nor its adjustment device without
damage to the protective device is removed or changed.
5.
EEC TYPE-APPROVAL
5.1. procedure
EEC type-approval shall be carried out according to a special legal
code ^ 2).
5.2 type-examination
If it has been ascertained from the application file that the pattern conforms to the
the provisions of this Ordinance, then, must be laboratory tests on
a number of instruments under the following conditions:
5.2.1 number of meters
Number of meters to be submitted by the manufacturer is as shown in the following
table:
+-------------------------+--------------+
| Nominal flow Qn, m3/h | The number of water meters |
+-------------------------+--------------+
| Qn < 1.5 | 10 |
+-------------------------+--------------+
| 1,5 = 15 | 2 |
+-------------------------+--------------+
Depending on the course of the tests, the competent authority may:
-decide not to test all the meters submitted, or
-request additional meters from the manufacturer, so that the test could continue.
5.2.2 Pressure
For the metrological tests referred to in point 5.2.4 the pressure at the outlet shall be
from the meter, sufficiently high to prevent cavitation.
5.2.3. Test equipment
In General, water meters should be tested individually and, in all cases
in such a way as to demonstrate the individual characteristics of each
of them.
Czech metrology institute or authorized metrological centre
must take all necessary steps to ensure that the relative
inaccuracy in measuring the volume of water delivered does not exceed 0.3% including
the inclusion of the various causes of error in installation.
The maximum permissible inaccuracy is 5% in the case of measurement of pressure and 2.5% in
the case of measurement of loss of pressure.
During each test, the relative change in flows may not exceed 2.5%
between Qmin and Qt and 5% between Qt and Qmax.
The maximum permissible inaccuracy in the measurement of temperature is 1 ° C.
The test equipment must be approved by Czech metrological Institute
regardless of where the tests are carried out.
5.2.4 Test
5.2.4.1 test procedure
The tests include the following activities, which are carried out in that
order:
the pressure tightness test),
(b) the determination of the error curves) depending on the flow rate through the
detection of effect of pressure, temperature, and the inclusion of normal
installation conditions specified by the manufacturer for this type of meter (direct
sections of piping upstream and downstream of the meter, constrictions, obstacles,
etc.),
(c)), the determination of pressure losses
d) accelerated endurance test,
(e)) the thermal shock resistance test for meters with a nominal
flowrate Qn of not more than 10 m3/h.
5.2.4.2 description of tests
The test must be carried out in the following way.
-The pressure tightness test is conducted in (85 +/-5) ° C, and in the
two parts:
and) each meter must withstand pressure equal to 1 times the maximum
operating pressure, applied for a period of 15 minutes, without
or seepage through (see point 4.1 (f))),
b) each meter must withstand a pressure of twice the maximum
operating pressure, applied for a period of one minute, without damaging the
or a blockage (see point 4.1 (f)).
-The results of the tests of the error curves and loss of pressure must provide
a sufficient number of points to enable the curves to be reliably drawn in
throughout the range.
-The accelerated endurance test is carried out as
shown in the table below:
+----------+----------------+---------+---------+-----------+------------+-------------+
| Rated | Test | Kind of | Number of | Duration | Time | Time |
flow flow | | | tests | break | breaks during the duration of the activities | | |
the meter and the temperature ' | | | | | run a test | | |
| | | | | | | and stopping the flow |
| | | | | | | (seconds) |
+----------+----------------+---------+---------+-----------+------------+-------------+
| | Qn | Nespojitá | 15 100 000 | | 15 | 0.15 (Qn), (1) |
| | (50 +/-5) ° C | | | | | at least |
| Qn < = 10 | | | | | | 1 |
|m3/h +----------------+---------+---------+-----------+------------+-------------+
| | Qmax | | | | | |
| | (85 +/-5) ° C | Continuous | | | 100 h | |
+----------+----------------+---------+---------+-----------+------------+-------------+
| | Qn | | | | | |
| | (50 +/-5) ° C | Continuous | | | 500 h | |
| Qn > 10 | | | | | | |
|m3/h +----------------+---------+---------+-----------+------------+-------------+
| | Qmax | | | | | |
| | (85 +/-5) ° C | Continuous | | | 200 h | |
+----------+----------------+---------+---------+-----------+------------+-------------+
(1) (Qn) is a number equal to the value of Qn, expressed in m3/h.
----------------------------------------------------------------------------------------
Before the first test and after each series of tests shall determine the error
measurement;
the minimum requirement is to be determined at the following flowrates:
Qmin, Qt to Qmax, 0.5 Qn
During each test, the volume of water must be flowing through the meter
large enough to turn the pointer or roller on the verification
the scale of one or more complete revolutions and to eliminate the influence of the
periodic data errors.
The thermal shock resistance test contains 25 cycles, which are
perform the following steps:
+---------------+------+-------------+
| The temperature of the water | Flow rate | Duration |
+---------------+------+-------------+
| (85 +/-5) st. (C) | Qmax | 8 minutes ago |
+---------------+------+-------------+
|-| 0 | 1 to 2 minutes |
+---------------+------+-------------+
| Cold water | Qmax | 8 minutes ago |
+---------------+------+-------------+
|-| 0 | 1 to 2 minutes |
+---------------+------+-------------+
5.2.5. Conditions for EEC type-approval
Type of meter is approved if:
and) corresponds to the administrative, technical and metrological requirements of this
the Ordinance and its annex,
(b)) and tests), b) and (c)) under 5.2.4.1 show that it corresponds to the
regards metrological and technological characteristics of parts II and III
of this annex,
(c)), after each accelerated durability test and after each
the thermal shock resistance test does not detect any change in relation to
the initial curve greater than 1.5% between Qt and Qmax or greater than 3% between
Qmin and Qt.
5.3. Eec type-approval Certificate
In the EEC pattern approval certificate can be enabled to perform when
the initial verification of the accuracy test with cold water.
This option is enabled only if, during the examination for
EEC type-approval to allow examination of the relationship between the warm
and cold water accuracy tests do with cold water and if
This test proved that the water meter that meets this test,
also, the maximum permissible errors specified in point 2.1.
In this case, the certificate must contain a description of EEC type-approval of this
the tests and the relevant requirements, in particular those relating to the holiday season
errors and test flow rates.
6.
THE INITIAL EEC VERIFICATION
The initial EEC verification shall be carried out under the special meters of the legal
code ^ 2).
6.1. Verification procedure
Initial verification must be carried out in a place approved by the Czech
metrological Institute.
The arrangement of space and the test equipment must be such that
verification may be carried out in safe, reliable conditions, and without
loss of time for the persons who are responsible for these tests. Must be
met the requirements of section 5.2.3, with the exception of the requirements relating to the temperature
for meters for which the tests are carried out with cold water in conformity with the
the provisions, which may be listed in the EEC type-approval certificate.
In the test centre it is possible to make such arrangements, which
allow you to test the meters in the series. However, the output of pressure of all the meters
There must always be sufficient to prevent cavitation; may be taken
Special measures to prevent interference between meters.
The complete unit may include automatic devices, by-pass
valves, flow-restrictors, etc., provided that each test
the circuit between the meters verified and the control tanks is clearly
defined and that it is possible at any time to check the internal pressure tightness
These circuits.
You can use any type of water supply system, but if
several test circuits are operated in parallel, then between them shall not
There are no interference incompatible with the requirements of 5.2.3.
If a control tank is divided into several chambers, the separating
the walls must be sufficiently rigid to ensure that the volume of any
the Chamber does not vary by more than 0.2% according to whether the adjacent
the Chambers are full or empty.
6.2. Test procedure
Water meters must conform to the approved type.
The initial EEC verification includes pressure tightness test and precisions.
6.2.1. Pressure tightness test
The pressure tightness test may be carried out with cold water. This
the test is to be carried out after one minute at 1 times the maximum
operating pressure. During this test, there must be no walls of the meter to
No layoffs or leaking.
6.2.2 accuracy test
accuracy test 6.2.2.1 with hot water
Accuracy test is normally carried out with hot water at a temperature of (50 +/-
5) st. (C) at least three flowrates:
(a) between 0.9 Qmax and Qmax;
(b) between Qt and Qt 1.1,
(c) between Qmin and 1.1 Qmin.
During this test, the meter must comply with the maximum permissible errors
referred to in point 2.1.
If it is found that all the errors lie in one direction, then the meter
You must set up so that all of the error does not exceed half of the maximum
permissible error.
6.2.2.2 accuracy test with cold water
The accuracy of the test can be performed with cold water, if it is so
provided for in the EEC type-approval certificate. In this case, the test
carried out in accordance with the procedures referred to in the certificate.
1) Decree No. 262/2000 Coll., which ensures consistency and accuracy
gauges and measurement.
2) Decree No. 332/2000 Coll., laying down some of the procedures in the
type-approval and verification of fixed gauges, called mark
EEC.