Mandatory requirements

A person who is selling liquefied petroleum gas shall ensure that the weighing instrument used to weigh the liquified petroleum gas cylinder meets the following requirements at each (a) Discrimination– (i) A weighing instrument not equipped with digital indication shall show a clearly visible change of indication, when a load equal to half the maximum specified in Regulation 9 is applied at no load and at full load to the load receptor without shock; (ii) A weighing instrument equipped with digital indication shall change is indication at no load and at full load when an extra load of not more than one and half scale intervals is applied on the load receptor without shock. (b) SensitivityA nonautomatic weighing instrument shall have sensitivity such that, for any load, a change of load equal to the maximum permissible error specified in regulation 9 shows a permanent displacement of the index of at leastNational Metrology 13 (i) 2 millimeter for weighing instruments of class III or IIII with a maximum capacity of 30 kilograms or less; (ii) 5 millimeter for a weighing instrument of class III or IIII with a maximum capacity greater than 30 kilograms. (c) RepeatabilityWhen the same load is weighed 3 or more times, the difference between the indications of any two weightings shall not exceed the absolute value of the maximum permissible error specified in regulation 9. (d) EccentricityWhen a load of on-third of the maximum capacity of the instrument is displaced from the centre of the load receptor or the extreme off-centre position on the load receptor, the indicated mass shall remain within the maximum permissible error specified in regulation 9. (e) InterchangeabilityWhen, for a balanced equal-armed weighing instrument, the load and working standard weights are interchanged on the load receptors. the indicated weight shall not change by more than twice the absolute value of the maximum permissible error specified in regulation 9.