# The Measuring Instruments Regulations 2016, Paragraph 23: Maximum permissible error


(1) A automatic gravimetric filling instrument shall have a specified accuracy class X(x) for which the maximum permissible error value of each fill from the average shall be equal to the limits specified in the following table, multiplied by the class designation factor (x) calculated in accordance with sub-paragraph (2)—
Value of the mass of the fills (m) in grams
Maximum permissible deviation of each fill from the average for class X(1)
In use
m ≤ 50
9%
50 ˂ m ≤ 100
4.5 grams
100 ˂ m ≤ 200
4.5%
200 ˂ m ≤ 300
9 grams
300 ˂ m ≤ 500
3%
500 ˂ m ≤ 1000
15 grams
1 000 ˂ m ≤ 10 000
1.5%
10 000 ˂ m ≤ 15 000
150 grams
15 000 ˂ m
1%
(2) In sub-paragraph (1), (x) shall be 1 x 10k, 2 x 10k, 5 x 10k, k being a positive or negative whole number or zero.
(3) For in-service testing, when the reference particle mass exceeds 0.1 of the maximum permissible in-service deviation, the values derived from the table in sub-paragraph (1) shall be increased by 1.5 times the value of the reference particle mass. However the maximum value of the maximum permissible deviation shall not exceed (x) by 9%.
(4) Particle mass correction is not applicable to limits which are derived from the table in sub-paragraph (1) including influence quality tests and zero setting.
(5) The table in sub-paragraph (1) is illustrative of the maximum permissible deviation where the class designation factor is 1.

---
Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/6/paragraph/23 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-6/paragraph-23
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.