HYDAC International CS1000 Series, Инструкция по эксплуатации и техническому обслуживанию

Страница: 88 / 100

Tables - ISO 4406 / SAE AS 4059 / NAS 1638
HYDAC Filtersysteme GmbH en Page 86
BeWa CS1000 3247149l en.doc 2007-02-01
17 ISO 4406 / SAE AS 4059 / NAS1638 Classes
17.1 ISO 4406:1999
In ISO 4406:1999 particle counts are determined cumulatively, i.e. > 4 µm(c), >6 µm(c) and >14 µm
(c) (manually by filtering the fluid trough an automatically using particle counters) and allocated to
measurement references.
The goal of allocating particle counts to references is to facilitate the assessment of fluid cleanliness
ratings.
In 1999 the "old" ISO 4406:1987 was revised and the size ranges of the particle sizes undergoing
analysis redefined. The counting method and calibration were also changed.
This is important for the user in his everyday work: Even thought the measurement references of the
particles undergoing analysis have changed, the cleanliness code will change only in individual cases.
When drafting the "new" ISO 4406:1999 it was ensured that not all the existing cleanliness provisions
for systems had to be changed.
17.1.1 ISO 4406 table
Allocation of particle counts to cleanliness classes:
Particle count / 100 ml Particle count / 100 ml
Class More than Up to (and including) Class More than Up to (and including)
0 0 1 15 16,000 32,000
1 1 2 16 32,000 64,000
2 2 4 17 64,000 130,000
3 4 8 18 130,000 250,000
4 8 16 19 250,000 500,000
5 16 32 20 500,000 1,000,000
6 32 64 21 1,000,000 2,000,000
7 64 130 22 2,000,000 4,000,000
8 130 250 23 4,000,000 8,000,000
9 250 500 24 8,000,000 16,000,000
10 500 1,000 25 16,000,000 32,000,000
11 1,000 2,000 26 32,000,000 64,000,000
12 2,000 4,000 27 64,000,000 130,000,000
13 4,000 8,000 28 130,000,000 250,000,000
14 8,000 16,000
Note: increasing the measurement reference by 1 causes the particle count to double.
Example: ISO class 18 / 15 / 11 means that the following are found in 1 ml of an analyzed sample:
Contamination level Particle count / ml Size range
18 1,300 – 2,500 > 4 µm(c)
15 160 – 320 > 6 µm(c)
11 10 – 20 > 14 µm(c)