Legal Metrology Act, 2014 (Act No. 9 of 2014)RegulationsLegal Metrology Regulations, 2017Part XI : Measuring instruments and containers used for prescribed purposes93. Cream test beam scales and torsion balances index |
| (1) | Where a cream test beam scale or torsion balance is provided with an index pointer moving over a graduated scale— |
| (a) | the clear interval between the graduations must be not less than 1 mm; and |
| (b) | the width of the pointer at its extremity must not exceed the width of any graduation line. |
| (2) | The pointer of a cream test beam scale or torsion balance provided with a graduated indicating or sector plate or a graduated difference chart must have travel beyond the extreme graduations for a distance of not less than the distance between the smallest graduations, whether the scale is unloaded or is loaded to capacity. |
| (3) | Where a gravity ball is provided on a cream test beam scale or torsion balance— |
| (a) | it must be set as to ensure, as far as is practicable, that the scale turns equally readily whether it is unloaded or loaded to capacity; and |
| (b) | its retaining screw in the case of an unenclosed gravity ball must be covered by a stud or plug suitable for receiving the verification mark. |
| (4) |
| (a) | When certified weights equal to half the capacity of a cream test beam scale or torsion balance are placed on each pan or bottle holder in any position normally occupied by a cream test bottle, the scale must be in an equilibrium state (two forces that are equal and opposite) within the limits of one-half of the turning allowance. |
| (b) | When certified weights equal to the capacity of a cream test beam scale or torsion balance are evenly distributed on each pan or bottle holder, the scale must indicate equilibrium within the limits of the turning allowance. |
| (c) | A cream test beam scale or torsion balance, whether unloaded or loaded with certified weights equal to the capacity of the scale, must turn in accordance with Table 10, any error having been corrected: |
1 |
2 |
3 |
TABLE 10 |
||
Capacity not exceeding |
Turning allowance |
|
At the time of verification |
Measuring instruments in actual use |
|
240 g |
75 mg |
150 mg |
300 g |
200 mg |
400 mg |
| (5) |
| (a) | A self-indicating cream test scale must be tested according to regulation 90. |
| (b) | The allowances of error for self-indicating cream test scales are those prescribed for self-indicating weighing instruments in regulation 90. |
| (6) |
| (a) | The certifying stamp must be placed— |
| (i) | in the case of a cream test beam scale, in accordance with the provisions of SANS 302; |
| (ii) | in the case of a cream test torsion balance, upon the sealing plug provided on the gravity ball or, where no gravity ball is fitted or where the gravity ball is within the housing, upon a lead plug inserted in the housing which must be sealed; or |
| (iii) | in the case of a self-indicating cream test scale, in accordance with the provisions SANS 1649. |
| (b) | Protective marks (seals) must be affixed to prevent unauthorised access to the working parts of any cream test scale provided with a housing. |