분동세척관련 OIML기술기준
Cleaning weights
It is important to clean weights before any measurements are made because the cleaning process may change the mass of the weight. Cleaning should not remove any significant amounts of weight material. Weights should be handled and stored in such a way that they stay clean. Before calibration, dust and any foreign particles shall be removed. Care must be taken not to change the surface properties of the weight (i.e. by scratching the weight).
If a weight contains significant amounts of dirt that cannot be removed by the methods cited above, the weight or some part of it can be washed with clean alcohol, distilled water or other solvents. Weights with internal cavities should normally not be immersed in the solvent to avoid the possibility that the fluid will penetrate the opening. If there is a need to monitor the stability of a weight in use, the mass of the weight should, if possible, be determined before cleaning.
After weights are cleaned with solvents they must be stabilized for the times given in Table B.1.
Table B.1 Stabilization time after cleaning
|
Weight class |
E1 |
E2 |
F1 |
F2 to M3 |
|
After cleaning with alcohol |
7–10 days |
3–6 days |
1–2 days |
1 hour |
|
After cleaning with distilled water |
4–6 days |
2–3 days |
1 day |
1 hour |
Thermal stabilization
Prior to performing any calibration tests, the weights need to be acclimated to the ambient conditions of the labo- ratory. In particular, weights of classes E1, E2 and F1 should be close to the temperature in the weighing area.
B.4.3.1 The mandatory minimum times required for temperature stabilization (depending on weight size, weight class and on the difference between the initial temperature of the weights and the room temperature in the labora- tory) are shown in Table B.2. As a practical guideline, a waiting time of 24 hours is recommended.
Table B.2 [11] Thermal stabilization in hours
|
ÄT* |
Nominal value |
Class E1 |
Class E2 |
Class F1 |
Class F2 |
|
± 20 °C |
1 000, 2 000, 5 000 kg |
- |
- |
79 |
5 |
|
100, 200, 500 kg |
- |
70 |
33 |
4 |
|
|
10, 20, 50 kg |
45 |
27 |
12 |
3 |
|
|
1, 2, 5 kg |
18 |
12 |
6 |
2 |
|
|
100, 200, 500 g |
8 |
5 |
3 |
1 |
|
|
10, 20, 50 g |
2 |
2 |
1 |
1 |
|
|
< 10 g |
1 |
0.5 |
|||
|
± 5 °C |
1 000, 2 000, 5 000 kg |
- |
- |
1 |
1 |
|
100, 200, 500 kg |
- |
40 |
2 |
1 |
|
|
10, 20, 50 kg |
36 |
18 |
4 |
1 |
|
|
1, 2, 5 kg |
15 |
8 |
3 |
1 |
|
|
100, 200, 500 g |
6 |
4 |
2 |
0.5 |
|
|
10, 20, 50 g |
2 |
1 |
1 |
0.5 |
|
|
< 10 g |
0.5 |
||||
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