The Weighing Equipment (Automatic Rail-weighbridges) Regulations 2003

regulation 9(3)

SCHEDULE 6 E+W+S (Prescribed limits of error)

The maximum permissible errors for weighing-in-motion shall be as specified in Table 1.

Table 1

Accuracy class	Percentage of mass of single wagon or total train, as appropriate
	Initial verification	In-service
0.2	±0.10%	±0.2%
0.5	±0.25%	±0.5%
1	±0.50%	±1.0%
2	±1.00%	±2.0%

On initial verification of an automatic rail-weighbridge weighing coupled wagons, the errors of not more than 10% of the weighing results taken from one or more passes of the test train may exceed the appropriate maximum permissible error given in Table 1 but shall not exceed two times that value.

Application of maximum permissible errors (weighing-in-motion) E+W+S

Wagon weighing (Clause 2.8.2.1 of Part 1 of OIML R 106)

The maximum permissible error for coupled or uncoupled wagon weighing, shall be one of the following values, whichever is greater:

• • the value calculated according to Table 1, rounded to the nearest scale interval;

• • the value calculated according to Table 1, rounded to the nearest scale interval for the weight of a single wagon equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings), or

• • 1 d.

Train weighing (Clause 2.8.2.2 of Part 1 of OIML R 106)

The maximum permissible error for train weighing shall be one of the following values, whichever is greater:

• • the value calculated according to Table 1, rounded to the nearest scale interval;

• • the value calculated according to Table 1, 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 in the train (not exceeding 10 wagons) and rounded to the nearest scale interval, or

• • 1 d for each wagon in the train but not exceeding 10 d.

The maximum permissible errors on static weighing for increasing or decreasing loads shall be the appropriate values in Table 2.

Table 2

Maximum permissible errors	Load (m) expressed in numbers of scale intervals
±0.5d	0 �?� m �?� 500
±1.0d	500 < m �?� 2 000
±1.5d	2 000 < m �?� 10 000

Scale interval (d) (Clause 2.3 of Part 1 of OIML R 106) E+W+S

For a particular method of weighing-in-motion and combination of load receptors, all weight indicating and printing devices on an automatic rail-weighbridge shall have the same scale interval.

The relationship between the accuracy class, the scale interval and the maximum wagon weight divided by the scale interval shall be as specified in Table 3.

Table 3

Accuracy class	D (kg)	(maximum wagon weight)/d
		minimum	maximum
0.2	�?� 50	1 000	5 000
0.5	�?� 100	500	2 500
1	�?� 200	250	1 250
2	�?� 500	100	600

The scale intervals of the indicating or printing devices shall be in the form of 1 × 10^k, 2 × 10^k or 5 × 10^k, “k” being a positive or a negative whole number or zero.