S.L. 454.12 · Use Of Bottles As Measuring Instruments (S.L. 454.12)
S.L. 454.12 Art. 8easily or millilitres in cl, 4 mm high it is not more or, where of Schedule 1 paragraph of as to avoid height as the method or and not the brim level by the symbol give rise to This Annex container regulations and 1. A sample manufacture production. If the result satisfactory, batch subject to the T
A measuring container bottle shall bear the following indelible, legible and visible indications: 8.1. on its side, on the bottom rim or on the bottom: 8.1.1. an indication of its nominal capacity in litres, centilitres figures at least 6 mm high, if the nominal capacity is greater that 100 if it is from 100 cl down to but not including 20 cl and 3 mm high if that 20 cl, followed by the symbol for the unit of measurement used appropriate, by the name of the unit in accordance with the provisions of the Metrology Act; 8.1.2. the manufacturer’s identifying mark prescribed in the first Section 5; 8.1.3. the sign prescribed in the third paragraph of Section 5; 8.2. On the bottom or on the bottom rim, in such a manner confusion with the previous indication, in figures on the same minimum those expressing the corresponding nominal capacity, according to methods of filling for which the bottle is intended:
8.2.1. an indication of the brim capacity expressed in centilitres followed by the symbol cl,
8.2.2. and, or an indication of the distance in millimetres from to the filling level corresponding to the nominal capacity, followed mm. Other indications may appear on the bottle provided they do not confusion with the compulsory indications. ANNEX II lays down the procedures from the statistical checking of measuring bottles in order to meet the requirements of regulation 2 of these item 6 of Annex I. METHOD OF SAMPLING of measuring container bottles of the same design and the same shall be drawn from a batch corresponding, in principle, to an hour’s of the check on a batch corresponding to an hour’s production is not a second test can be carried out, based either on another sample from a corresponding to a longer period of production or, where production has been check recognized by the competent authority, on the results recorded on manufacturers’ check-cards. of measuring container bottles constituting the sample shall be 35 or on which of the two methods of applying the results, detailed in been chosen.
MEASURING THE CAPACITY OF THE MEASURING CONTAINER CONSTITUTING THE SAMPLE
container bottles shall be weighed empty. be filled with water at 20°C of a know density, up to the filling level the method of checking used. then be weighed in full. shall be carried out by means of a legal measuring instrument, suitable the necessary operations. measuring the capacity shall not be greater then one-fifth of the maximum error corresponding to the nominal capacity of the measuring container
APPLICATION OF THE RESULTS Use of the standard deviation method of measuring container bottles in the sample 35. Calculate as follows: (see 3.1.4.): average x of the actual capacities x of the bottles in the sample, i estimated standard deviation s of the actual capacities x of the bottles i
Calculate as follows: The upper limit T : the sum of the indicated capacity (see Annex I, s of the maximum permissible error corresponding to this capacity. The lower limit T : the difference between the indicated capacity (see i Section 8) and the maximum permissible error corresponding to this
Acceptance criteria: shall be declared to comply with these regulations if the numbers x and simultaneously the following three inequations: x + k · s < T s x - k · s > T i s < F(T -T ) s i where k = 1.57 and F = 0.266 3.1.4. Calculation of the mean value x and the estimated standard of the batch. Calculate as follows: Σ • the sum of 35 actual capacity measurements x = x i 1 Σ • the mean value of the 35 measurements x = x i 35 Σ i2 • the sum of the squares of the 35 measurements x • the
(Σ )2 • the square of the sum of the 35 measurements x , then i
1 Σ i2 (Σ )2 • the corrected sum SC = x - x i 35 SC • the estimated variance v = 34 √ Hence the estimated standatd deviation: s = v
3.2. Use of the average of measuring range method
The number of measuring container bottles in the sample is 40. 3.2.1. Calculate as follows (see 3.2.4): 3.2.1.1. the average x of the actual capacities x of the bottles in the i 3.2.1.2. the average range R of the actual capacities x of the i sample.
3.2.2. Calculate as follows: 3.2.2.1. the upper limit T the sum of the indicated capacity s Section 8) and the maximum permissible error corresponding to capacity, 3.2.2.2. the lower limit T : i difference between the indicated capacity (see Annex I, the maximum permissible error corresponding to this capacity. 3.2.3. Acceptance criterion
The batch shall be declared to comply with these regulations if the R verify simultaneously the following three inequations:
x + k' · R < T s x + k' · R > T i R < F'(T -T ) s i where k' = 0.668, and F' = 0.628. 3.2.4. Calculation of the mean value x and of the average range measuring container bottles in the sample. obtain x, calculate as follows: Σ sum of the 40 actual capacity measurements x = x i 1 Σ mean value of these 40 measurements: x = x i 40
obtain R: sample, in chronological order of selection, into eight sub-samples of container bottles each. follows:
range of each of the sub-samples, i.e. the difference between the actual capacity of the largest and the smallest of the five bottles in the sub-samples; eight ranges are thus obtained: R , R , ..., R 1 2 8 sum of the ranges of the eight sub-samples: R = R + R + ..., R 1 1 2 8 average range R is therefore:
1 ΣR 1 8