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Cabinet of Ministers Regulations No. 664 in Riga august 22, 2006 (pr. No 43) provisions on metrological requirements water consumption meters were issued in accordance with the law "on a uniformity of measurements" the second subparagraph of article 6 and the law "on conformity assessment" 7. the first paragraph of article 1. determine the metrological requirements and the conformity assessment procedures of water consumption meters for net in cold or warm water in residential, commercial and light industrial use, before the water meter is placed in the internal market , placed in service or placed on the internal market and put into service. 2. the meaning of these provisions: 2.1. water consumption meter-measuring tool designed for through the measurement transducer in water volume discharged preservation of memory and indication, the relevant measuring conditions;
2.2. minimum flowrate (Q1)-the minimum water flow rate, water consumption meter provides indications that satisfy the requirements regarding maximum permissible error;
2.3. the transitional flow (Q2)-flow rate value, which is located between the permanent and minimum flow. This flow range is divided into two areas-the upper area and lower area. Each zone has a maximum permissible error;
2.4. the standing flow (Q3)-the maximum rate of flow when the water meter operates in a satisfactory, if compliance with the normal conditions of use-variable or a constant flow;
2.5. overload (Q4)-largest rate of flow when the water meter operates in a satisfactory manner, temporarily without causing damage. 3. The essential requirements for meters of water consumption of certain regulatory provisions on metrological requirements measuring instruments. Specific requirements for water meters set in the annex to these provisions. 4. Water consumption meters comply with the requirements of these rules and regulations in the Act on the metrological requirements measuring instruments. 5. the Person who installs water meters according to the requirements of these rules and regulations in the Act on the metrological requirements measuring tools, ensures precise intended or foreseeable consumption measures and assume responsibility for the water meter is correctly setup. 6. The manufacturer may choose conformity assessment procedures of modules B + F or B + D or H1 according to legislative acts on the metrological requirements measuring instruments. 7. Water consumption meters for which type-approval was issued to this provision to the date of entry into force of the market and allowed to put water consumption meters, which made first-time verification, allowed to pass until they use the type approval expiration date, but if it is not set, the-by 2016 of 30 October. 8. The entry into force of the provisions by 30 October 2006. Informative reference to European Union Directive provisions included in the law arising from the European Parliament and of the Council of 31 March 2004, Directive 2004/22/EC on measuring instruments. Prime Minister a. Halloween economic Minister a. Štokenberg annex a Cabinet of 22 august 2006 Regulation No. 664 of specific metrological requirements specified by the manufacturer 1 meter operating conditions: 1.1. water flow range values shall satisfy the following conditions (until 30 March 2009 for the Q2/Q1 values must be 1.5, 2.5, 4 or 6,3): Q3/Q1 > 10; Q2/Q1 = 1.6; Q4/Q3 = 1.25; 1.2. water temperature range limit values established from 0,1 ° C to at least 30 ° C or 30 ° C to at least 90 ° c. The meter can be designed for operation in both ranges; 1.3. the relative pressure range of the water from 0.3 bar to at least 10bār if the flow is constant (Q3); 1.4. is defined in the source of supply voltage: nominal value of the AC as well as limit values for direct current. 2. The maximum permissible error: 2.1. positive or negative volume flow range between the transitional flowrate (Q2) (included) and the overload (Q4) is: 2%, if the water temperature is 30 ° C; 2.2. positive or negative volume flow range between the minimum flowrate (Q1) and the transitional flowrate (Q2) (excluded) is 5% in any water temperature. 3. Permissible effect of disturbances: 3.1. electromagnetic immunity: 3.1.1. is permitted such electromagnetic interference effects on the water meter if measurement result changes not exceeding the critical value changes, determined in accordance with this annex, point 3.1.3 or meter is that it cannot be considered a valid result (for example, temporary fluctuations that cannot read, write or send as a result of measurement); 3.1.2. after the electromagnetic disturbance the water meter consumption restores operation maximum permissible error limits, ensure all measuring functions and all before the disturbance recovery of the data obtained; 3.1.3. the critical change value is the smaller of the two following values: 188.8.131.52. half of the maximum permissible error of the measured volume of the upper zone; 184.108.40.206. the maximum permissible error at the Q3 one minute; 3.2. durability: 3.2.1. after testing, taking into account, for the period specified by the manufacturer, water meter shall meet the following criteria; 3.2.2. measurement result after the durability test of the changes, compared with the initial measurement result, shall not exceed the following: 220.127.116.11.3% of the metered volume between Q1 and Q2 (included) (not included); 18.104.22.168.1.5% of the metered volume between Q2 (inclusive) and Q4 (inclusive); 3.2.3. volume measured by cyclic durability test shall not exceed: 22.214.171.124. ± 6% of the metered volume between Q1 and Q2 (included) (not included); 126.96.36.199. ± 2.5% of the metered volume between Q2 (inclusive) and Q4 (inclusive) water consumption meters are designed for measurements in the temperature range between 0,1 ° C and 30 ° C ± 3.5 188.8.131.52.% of the metered volume between Q2 (inclusive) and Q4 (inclusive) water consumption meters are designed for measurements in the temperature range between 30 ° C and 90 ° c. 4. Eligibility: 4.1 if the labelling clearly indicates otherwise, the water meter works no matter what condition it; 4.2. measurement of countercurrent: 4.2.1. the manufacturer shall specify whether the meter is designed for their measurements. In this case, the volume of water in countercurrent are deducted from the total volume or recorded separately; 4.2.2. the flow measurement of the maximum permissible error is the same for both flow directions; 4.2.3. water consumption meters are not designed for the measuring of the countercurrent, must ensure that their detention or to endure occasional counterflow principle without any damages or changes in metrological properties. 5. indicates the Volume in cubic metres.
Economic Minister a. Štokenberg in
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