D.2.3

Begin with the group with the best metrological characteristics (in this example, B10) and in accordance with R 60-2, 2.4.2, select the next largest capacity between 5 and 10 times that of the nearest smaller capacity load cell which has been selected. When no capacity meets this criterion, the selected load cell shall be that having the smallest capacity exceeding 10 times that of the nearest smaller capacity load cell which has been selected. Continue this process until all load cell capacities in the group have been considered.

In this example, select and identify:

B10 —  (full evaluation test required)

D.2.4

Move to the group with the next best characteristics (in this example, C6) and, in accordance with R 60-2, 2.4.2 select the next largest capacity between 5 and 10 times that of the nearest smaller capacity load cell which has been selected. When no capacity meets this criterion, the selected load cell shall be that having the smallest capacity exceeding 10 times that of the nearest smaller capacity load cell which has been selected. Continue this process until all load cell capacities in the group have been considered.

In this example, there is no change to the load cells selected. The capacities of the load cells C6 —  and C6 —  exceed the capacity of the load cell C6 —  by greater than 5 times but not greater than 10 times. However, a load cell of better metrological characteristics (from group B10) has already been selected. Therefore, in order to minimise the number of load cells to be tested according to R 60-2, 2.3.1, neither cell is selected.

D.2.5

Again, and repeating this process until all groups have been considered, move to the group with the next best characteristics (in this example, C3) and in accordance with R 60-2, 2.4.4, select the next largest capacity between 5 and 10 times that of the nearest smaller capacity load cell which has been selected. When no capacity meets this criterion, the selected load cell shall be that having the smallest capacity exceeding 10 times that of the nearest smaller capacity load cell which has been selected. Continue this process until all load cell capacities in the group and all groups have been considered.

In this example, select and identify:

C3 —  (full evaluation test required) Proceeding from smallest to largest capacity, the only capacity of load cell which is greater than 5 times the capacity of an already selected load cell but less than 10 times that capacity is the C3 —  load cell. Since the capacity of the C3 —  load cell does not exceed 5 times the capacity of the next smaller selected load cell, which is C3 — , according to R 60-2, 2.4.3 it is presumed to comply the requirements of this Recommendation.

D.2.6

After completing steps D.2.2 to D.2.5 and identifying the load cells, compare load cells of the same capacity from different groups. Identify the load cells with the highest accuracy class and highest in each group (see shaded portion of table below). For those load cells of the same capacity but from different groups, identify only the one with the highest accuracy class and and lowest .

Inspect the values of , , and for all cells of the same capacity.

If any load cell of the same capacity has a lower or higher than the identified load cell, that load cell (or load cells) is also liable for partial evaluation testing, specifically the conduct of additional temperature effect on minimum dead load, and barometric pressure effect tests.

If any load cell of the same capacity has a higher than the selected load cell, that load cell (or load cells) is also liable for partial evaluation testing, specifically the conduct of additional creep and DR tests.

In this example, the load cells identified above also have the best characteristics of lowest , highest and highest . This is normally the case, but not always.

D.2.7

If applicable, select the load cell for humidity testing in accordance with R 60-2, 2.4.5, that being the load cell with the most severe characteristics, for example the greatest value of or the lowest value of .

In this example, the load cell with the greatest value of or the lowest value of is the same load cell, therefore select:

B10 —  (humidity test required)

D.2.8

If applicable, select the load cell for the additional tests to be performed on digital load cells in accordance with R 60-2, 2.4.6, that being the load cell with the most severe characteristics, for example the greatest value of or the lowest value of .

2+h| D.2.9 Summarising, the load cells selected for test are:

In this example, no load cell in the family is equipped with electronics.