Manner of use
6.—(1) Where a measuring system is marked with—
(a)a temperature range, it shall not be used for trade in temperatures outside that range;
(b)a flowrate range, it shall not be used for trade at a flowrate outside that range.
(2) A measuring system shall not be used for trade unless it is marked in a manner which is sufficiently clear to enable the buyer to identify the product which that instrument delivers but this paragraph shall not apply where the instrument is used in the absence of the buyer.
(3) A measuring system shall not be used for trade in circumstances which are likely prematurely to degrade its metrological characteristics.
(4) A measuring system shall not be used for trade unless the sales indicator—
(a)is set to zero before measurement of the liquid fuel commences;
(b)remains at zero until that fuel starts to emerge from the instrument;
(c)is not reset to zero during measurement of that fuel; and
(d)cannot be advanced by any means other than by the discharge of that fuel from the instrument and the proper operation of the instrument.
(5) If a measuring system is adjusted, it shall not be used for trade unless the calibration of the instrument is set as close to zero error as is practicable.
(6) Where a measuring system used for trade bears a mark (other than a mark referred to in paragraph (1)) which signifies the manner and purpose of use, that instrument shall not be used in a manner or for a purpose which does not accord with that marking.
(7) A measuring system shall not be used in circumstances in which it may be prevented from operating consistently or accurately.
(8) Nothing in paragraphs (6) or (7) shall prevent the use for trade of an instrument where a buyer chooses to take a delivery which is less than the minimum measured quantity.