SuitabilityU.K.
16.—(1) A relevant instrument shall have no feature likely to facilitate fraudulent use, whereas possibilities for unintentional misuse shall be minimal.
(2) A relevant instrument 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) The errors of a relevant instrument at flows outside the controlled range shall not be unduly biased.
(4) Where a relevant instrument 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.
(5) A relevant instrument shall be robust and its materials of construction shall be suitable for the conditions in which it is intended to be used.
(6) When a relevant 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.
(7) A relevant instrument powered from the mains (AC or DC) shall be provided with an emergency power supply device or other means to ensure, during a failure of the principal power source, that all measuring functions are safeguarded.
(8) A dedicated power source shall have a lifetime of at least five years. After 90 % of its lifetime an appropriate warning shall be shown.
(9) An indicating device shall have a sufficient number of digits to ensure that the quantity passed during 8000 hours at Qmax does not return the digits to their initial values.
(10) The relevant instrument shall be able to be installed to operate in any position declared by the manufacturer in its installation instruction.
(11) The relevant instrument shall have a test element, which shall enable tests to be carried out in a reasonable time.
(12) The relevant instrument shall respect the MPE in any flow direction or only in one flow direction clearly marked.
Commencement Information
I1Sch. 1 para. 16 in force at 30.10.2006, see reg. 1(2)