Sch 6 para 12 Manner of use
(1) Where a measuring system is marked with— (a) a temperature range, it must not be used for trade in temperatures outside that range; or (b) a flowrate range, it must not be used for trade at a flowrate outside that range. (2) A measuring system which bears a mark which signifies the manner and purpose of use must not be used for trade in a manner or for a purpose which does not accord with that marking. (3) 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. (4) A measuring system must not be used for trade unless it is fitted with a ticket printing mechanism which provides an individual printed ticket. (5) A measuring system must not be used for trade in circumstances which are likely prematurely to degrade its metrological characteristics. (6) 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 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 instrument. (7) A measuring system must not be used in circumstances— (a) which are likely prematurely to degrade its metrological characteristics; or (b) in which it may be prevented from operating consistently or accurately.