The Measuring Instruments Regulations 2016

[F1 CHAPTER VI E+W+S Automatic Rail Weighbridges

Textual Amendments

F1 Schs. 1A-1K inserted (E.W.S.) (31.12.2020) by The Product Safety and Metrology etc. (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/696), reg. 1, Sch. 27 para. 49 (with Sch. 27 para. 50(a)) (as amended by S.I. 2020/676, regs. 1(1), 2); 2020 c. 1, Sch. 5 para. 1(1)

Accuracy classes E+W+S

1.   Instruments are divided into four accuracy classes as follows: 0.2; 0.5; 1; 2.

MPE E+W+S

2.1.   The MPEs for weighing-in-motion of a single wagon or a total train are shown in Table 8. E+W+S

Table 8

Accuracy class	MPE
0.2	± 0.1 %
0.5	± 0.25 %
1	± 0.5 %
2	± 1.0 %

2.2.   The MPEs for the weight of coupled or uncoupled wagons weighing-in-motion shall be one of the following values, whichever is the greatest: E+W+S

• — the value calculated according to Table 8, rounded to the nearest scale interval;

• — the value calculated according to Table 8, rounded to the nearest scale interval for a weight equal to 35 % of the maximum wagon weight (as inscribed on the descriptive markings);

• — one scale interval (d).

2.3.   The MPEs for the weight of train weighing-in-motion shall be one of the following values, whichever is the greatest: E+W+S

• — the value calculated according to Table 9, rounded to the nearest scale interval;

• — the value calculated according to Table 9, for the weight of a single wagon equal to 35 % of the maximum wagon weight (as inscribed on the descriptive markings) multiplied by the number of reference wagons (not exceeding 10) in the train, and rounded to the nearest scale interval;

• — one scale interval (d) for each wagon in the train, but not exceeding 10 d.

2.4.   When weighing coupled wagons; the errors of not more than 10 % of the weighing results taken from one or more passes of the train may exceed the appropriate MPE given in paragraph 2.2, but shall not exceed twice the MPE. E+W+S

Scale interval (d) E+W+S

3.   The relationship between the accuracy class and the scale interval shall be as specified in Table 9.

Table 9

Accuracy class	Scale interval (d)
0.2	d ≤ 50 kg
0.5	d ≤ 100 kg
1	d ≤ 200 kg
2	d ≤ 500 kg

Measurement range E+W+S

4.1.   The minimum capacity shall not be less than 1 t, and not greater than the value of the result of the minimum wagon weight divided by the number of partial weighings. E+W+S

4.2.   The minimum wagon weight shall not be less than 50 d. E+W+S

Performance under influence factor and electromagnetic disturbance E+W+S

5.1.   The MPE due to an influence factor shall be as specified in Table 10. E+W+S

Table 10

Load (m) in verification scale intervals (d)	MPE
0 < m ≤ 500	± 0.5 d
500 < m ≤ 2,000	± 1.0 d
2,000 < m ≤ 10,000	± 1.5 d

5.2.   The critical change value due to a disturbance is one scale interval.] E+W+S