Paragraph 12 Manner of use
Where a measuring system is marked with—
a temperature range, it must not be used for trade in temperatures outside that range; or
a flowrate range, it must not be used for trade at a flowrate outside that range.
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.
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.
A measuring system must not be used for trade unless it is fitted with a ticket printing mechanism which provides an individual printed ticket.
A measuring system must not be used for trade in circumstances which are likely prematurely to degrade its metrological characteristics.
A measuring system must not be used for trade unless the sales indicator—
is set to zero before measurement of the liquid fuel commences;
remains at zero until that fuel starts to emerge from the instrument;
is not reset to zero during measurement of that fuel; and
cannot be advanced by any means other than by the discharge of that fuel from the instrument and the proper operation of instrument.
A measuring system must not be used in circumstances—
which are likely prematurely to degrade its metrological characteristics; or
in which it may be prevented from operating consistently or accurately.