8.—(1) Where a measuring system is marked with—
(a)a temperature range, it must not be used for trade in temperatures outside that range; and
(b)a flowrate range, it must not be used for trade at a flowrate outside that range.
(2) A measuring system must 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 measuring system delivers but this paragraph does not apply where the measuring system is used in the absence of the buyer.
(3) A measuring system must not be used for trade in circumstances which are likely prematurely to degrade its metrological characteristics.
(4) A measuring system must 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 system;
(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 system and the proper operation of the system.
(5) If a measuring system is adjusted, it must not be used for trade unless the calibration of the system 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 system must not be used in a manner or for a purpose which does not accord with that marking.
(7) A measuring system must 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 a measuring system where a buyer chooses to take a delivery which is less than the minimum measured quantity.