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The Measuring Instruments (Cold-water Meters) Regulations 2006

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9.—(1) A cold-water meter shall have no feature likely to facilitate fraudulent use, whereas possibilities for unintentional misuse shall be minimal.

(2) A cold-water meter shall be suitable for its intended use taking account of the practical working conditions and shall not require unreasonable demands of the user in order to obtain a correct measurement result.

(3) Where a cold-water meter is designed for the measurement of values of the measurand that are constant over time, the instrument shall be insensitive to small fluctuations of the value of the measurand, or shall take appropriate action.

(4) The errors of a cold-water meter at flows outside the controlled range shall not be unduly biased.

(5) A cold-water meter shall be robust and its materials of construction shall be suitable for the conditions in which it is intended to be used.

(6) A cold-water meter shall be designed so as to allow the control of the measuring tasks after the instrument has been placed on the market and put into use. If necessary, special equipment or software for this control shall be part of the instrument. The test procedure shall be described in the operation manual.

(7) When an instrument has associated software which provides other functions besides the measuring function, the software that is critical for the metrological characteristics shall be identifiable and shall not be inadmissibly influenced by the associated software.

(8) The cold-water meter shall be able to be installed to operate in any position unless clearly marked otherwise.

(9) The manufacturer shall specify whether the cold-water meter is designed to measure reverse flow. In such a case, the reverse flow volume shall either be subtracted from the cumulated volume or shall be separately recorded. The same MPE shall apply to both forward and reverse flow.

(10) Cold-water meters not designed to measure reverse flow shall either prevent reverse flow or shall withstand an accidental reverse flow without any deterioration or change in metrological properties.

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