Specifications Relating to Non-automatic Weighing Devices (1998) (SI/98-81)

9. The acceptance limits of error applicable for each class of non-automatic weighing device are one-half the in-service limits of error set out in section 8 for that device for a specified load.

10. Where a module, such as an indicating element, or a weighing and load-receiving element, is tested separately for approval pursuant to section 3 of the Weights and Measures Act,

• (a) in the case of a module that is the only part of a weighing device that is subject to measurement errors due to disturbances or influence factors, the acceptance limits of error are the limits of error set out in these Specifications for that device for a specified load; and

• (b) in the case of all other modules, the acceptance limits of error are 0.7 times the limits of error set out in these Specifications for the weighing device for a specified load.

11. Regardless of the difference between the results permitted by these Specifications, no weighing result shall have an error that exceeds the applicable limits of error for the given load, with the exception of results obtained during disturbance tests.

12. The difference between the results of several weighings of the same load placed in approximately the same location on a weighing and load-receiving element shall not exceed the absolute value of the applicable in-service limits of error for that load.

13. The difference between the results for different positions of a load placed on a weighing and load-receiving element shall not exceed the absolute value of the applicable in-service limits of error for that load.

14. With respect to non-automatic indicating devices, the addition or removal of a load equal to the applicable in-service limits of error for the load placed on the weighing and load-receiving element, but not exceeding two verification scale intervals, shall cause

• (a) in the case of a weigh-beam or beam-over-pan scale that is without a supplementary indicating element and

  • (i) is equipped with a trig loop, a movement in the position of the weigh-beam from the centre position to either limit of the trig loop, and

  • (ii) is not equipped with a trig loop, the position of rest of the weigh-beam or lever system to change from the horizontal position or midway between limiting stops to either limit of motion; and

• (b) in the case of a weigh-beam or beam-over-pan scale that has a supplementary indicating element that has graduations without specific values, the position of the indicator to change

  • (i) in the case of a Class I or II device, by at least 1 mm (0.04 in.),

  • (ii) in the case of a Class III or IIII device with a maximum capacity not exceeding 30 kg (70 lb.), by at least 2 mm (0.08 in.), and

  • (iii) in the case of a Class or device with a maximum capacity greater than 30 kg (70 lb.), or a Class device, by at least 5 mm (0.2 in.).