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The manufacturer shall specify the rated operating conditions for the instrument as follows:
For the measurand:
The measuring range in terms of its maximum and minimum capacity.
For the electrical supply influence quantities:
In case of AC voltage supply | : | the nominal AC voltage supply, or the AC voltage limits. |
In case of DC voltage supply | : | the nominal and minimum DC voltage supply, or the DC voltage limits. |
For the mechanical and climatic influence quantities:
The minimum temperature range is 30 °C unless specified otherwise in the following chapters of this Annex.
The mechanical environment classes according to Annex I, point 1.3.2 are not applicable. For instruments which are used under special mechanical strain, e.g. instruments incorporated into vehicles, the manufacturer shall define the mechanical conditions of use.
For other influence quantities (if applicable):
The rate(s) of operation.
The characteristics of the product(s) to be weighed.
The required performance and the critical change value are given in the relevant Chapter of this Annex for each type of instrument.
The conformity assessment procedures referred to in Article 17 that the manufacturer can choose between are:
For mechanical systems:
B + D or B + E or B + F or D1 or F1 or G or H1.
For electromechanical instruments:
B + D or B + E or B + F or G or H1.
For electronic systems or systems containing software:
B + D or B + F or G or H1.
X or Y
as specified by the manufacturer.
XI, XII, XIII & XIIII
and
Y(I), Y(II), Y(a) & Y(b)
which shall be specified by the manufacturer.
The manufacturer shall specify the factor (x), where (x) shall be ≤ 2 and in the form 1 × 10k, 2 × 10k or 5 × 10k, where k is a negative whole number or zero.
Category Y applies to all other automatic catchweighers.
Net Load (m) in verification scale intervals (e) | Maximum permissible mean error | Maximum permissible error | |||||||
---|---|---|---|---|---|---|---|---|---|
XI | Y(I) | XII | Y(II) | XIII | Y(a) | XIIII | Y(b) | X | Y |
0 < m ≤ 50 000 | 0 < m ≤ 5 000 | 0 < m ≤ 500 | 0 < m ≤ 50 | ± 0,5 e | ± 1 e | ||||
50 000 < m ≤ 200 000 | 5 000 < m ≤ 20 000 | 500 < m ≤ 2 000 | 50 < m ≤ 200 | ± 1,0 e | ± 1,5 e | ||||
200 000 < m | 20 000 < m ≤ 100 000 | 2 000 < m ≤ 10 000 | 200 < m ≤ 1 000 | ± 1,5 e | ± 2 e |
Maximum permissible value for the standard deviation of a class X (x) instrument is the result of the multiplication of the factor (x) by the value in Table 2 below.
Net Load (m) | Maximum permissible standard deviation for class X(1) |
---|---|
m ≤ 50 g | 0,48 % |
50 g < m ≤ 100 g | 0,24 g |
100 g < m ≤ 200 g | 0,24 % |
200 g < m ≤ 300 g | 0,48 g |
300 g < m ≤ 500 g | 0,16 % |
500 g < m ≤ 1 000 g | 0,8 g |
1 000 g < m ≤ 10 000 g | 0,08 % |
10 000 g < m ≤ 15 000 g | 8 g |
15 000 g < m | 0,053 % |
For class XI and XII (x) shall be less than 1.
For class XIII (x) shall be not greater than 1.
For class XIIII (x) shall be greater than 1.
a For i = r the corresponding column of Table 3 applies with e replaced by er. | ||||
Accuracy classes | Verification scale interval | Number of verification scale intervals | ||
---|---|---|---|---|
Minimum valuea | Maximum value | |||
XI | Y(I) | 0,001 g ≤ ei | 50 000 | — |
XII | Y(II) | 0,001 g ≤ ei ≤ 0,05 g | 5 000 | 100 000 |
0,1 g ≤ ei | 5 000 | 100 000 | ||
XIII | Y(a) | 0,1 g ≤ ei | 500 | 10 000 |
XIIII | Y(b) | 5 g ≤ ei | 50 | 1 000 |
Where:
=
1, 2, … r
=
partial weighing range
=
total number of partial ranges
In specifying the measurement range for class Y instruments the manufacturer shall take account that the minimum capacity shall not be less than:
class Y(I) | : | 100 e |
class Y(II) | : | 20 e for 0,001 g ≤ e ≤ 0,05 g, and 50 e for 0,1 g ≤ e |
class Y(a) | : | 20 e |
class Y(b) | : | 10 e |
Scales used for grading, e.g. postal scales and garbage weighers | : | 5 e |
For automatic operation; as specified in Tables 1 and 2,
For static weighing in non-automatic operation; as specified in Table 1.
For each load in automatic operation; as specified in Table 1,
For static weighing in non-automatic operation; as specified for category X in Table 1.
For class XI and Y(I) the minimum range is 5 °C,
For class XII and Y(II) the minimum range is 15 °C.
Value of the mass, m (g), of the fills | Maximum permissible deviation of each fill from the average for class X(1) |
---|---|
m ≤ 50 | 7,2 % |
50 < m ≤ 100 | 3,6 g |
100 < m ≤ 200 | 3,6 % |
200 < m ≤ 300 | 7,2 g |
300 < m ≤ 500 | 2,4 % |
500 < m ≤ 1 000 | 12 g |
1 000 < m ≤ 10 000 | 1,2 % |
10 000 < m ≤ 15 000 | 120 g |
15 000 < m | 0,8 % |
The calculated deviation of each fill from the average may be adjusted to take account for the effect of material particle size.
For instruments where it is possible to pre-set a fill weight; the maximum difference between the pre-set value and the average mass of the fills shall not exceed 0,312 of the maximum permissible deviation of each fill from the average, as specified in Table 5.
Instruments are divided into four accuracy classes as follows: 0,2; 0,5; 1; 2.
Accuracy class | MPE of totalised load |
---|---|
0,2 | ± 0,10 % |
0,5 | ± 0,25 % |
1 | ± 0,50 % |
2 | ± 1,00 % |
The totalisation scale interval (dt) shall be in the range:
0,01 % Max ≤ dt ≤ 0,2 % Max
The minimum totalised load (Σmin) shall be not less than the load at which the MPE is equal to the totalisation scale interval (dt) and not less than the minimum load as specified by the manufacturer.
Instruments that do not tare weigh after each discharge shall have a zero setting device. Automatic operation shall be inhibited if zero indication varies by:
1 dt on instruments with automatic zero setting device;
0,5 dt on instruments with a semi-automatic, or non-automatic, zero setting device.
Operator adjustments and reset function shall be inhibited during automatic operation.
On instruments equipped with a printing device, the reset of the total shall be inhibited until the total is printed. The printout of the total shall occur if automatic operation is interrupted.
Table 7 | |
Load (m) in totalisation scale intervals (dt) | MPE |
---|---|
0 < m ≤ 500 | ± 0,5 dt |
500 < m ≤ 2 000 | ± 1,0 dt |
2 000 < m ≤ 10 000 | ± 1,5 dt |
Instruments are divided into three accuracy classes as follows: 0,5; 1; 2.
800 d for class 0.5,
400 d for class 1,
200 d for class 2.
Where d is the totalisation scale interval of the general totalisation device.
Accuracy class | MPE for totalised load |
---|---|
0,5 | ± 0,25 % |
1 | ± 0,5 % |
2 | ± 1,0 % |
The speed of the belt shall be specified by the manufacturer. For single-speed beltweighers, and variable-speed beltweighers having a manual speed setting control, the speed shall not vary by more than 5 % of the nominal value. The product shall not have a different speed than the speed of the belt.
It shall not be possible to reset the general totalisation device to zero.
Instruments are divided into four accuracy classes as follows:
0,2; 0,5; 1; 2.
Table 9 | |
Accuracy class | MPE |
---|---|
0,2 | ± 0,1 % |
0,5 | ± 0,25 % |
1 | ± 0,5 % |
2 | ± 1,0 % |
the value calculated according to Table 9, rounded to the nearest scale interval;
the value calculated according to Table 9, 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).
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.
The relationship between the accuracy class and the scale interval shall be as specified in Table 10.
Accuracy class | Scale interval (d) |
---|---|
0,2 | d ≤ 50 kg |
0,5 | d ≤ 100 kg |
1 | d ≤ 200 kg |
2 | d ≤ 500 kg |
Table 11 | |
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 |