FCU 8000 series
Overview - ISO 4406 / SAE AS 4059 and NAS 1638 classes
HYDAC FILTER SYSTEMS GMBH
en(us)
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BEWA FCU8000 3109776d en-us 2011-06-10.doc
2011-06-10
Specifying a cleanliness code for each particle size
Example: cleanliness class to AS 4059: 7 A / 7 B / 6 C / 5 D
Cleanliness class
Particle count / 100 ml
Size A ( > 1 µm / > 4 µm
(c)
)
100.000
Size B ( > 5 µm / > 6 µm
(c)
)
38.900
Size C ( > 15 µm / > 14 µm
(c)
)
3460
Size D ( > 25 µm / > 21 µm
(c)
)
306
Specifying the highest cleanliness code measured
Example: Cleanliness code according to AS 4059 6 A – F
The 6 A – F specification requires a particle count in size ranges A – F.
The respective particle concentration of cleanliness code 6 may not be exceeded in
any of these ranges
NAS 1638
Like ISO 4406, NAS 1638 describes particle concentrations in liquids. The analysis
methods can be applied in the same manner as ISO 4406:1999.
In contrast to ISO 4406, certain particle ranges are counted in NAS 1638 and
attributed to measurement references.
The following table shows the cleanliness classes in relation to the particle
concentration determined:
Maximum particle count / 100 ml
2…5
µm
5…15
µm
15…25
µm
25…50
µm
50…100
µm
> 100
µm
00
625 125
22
4
1 0
0
1.250
250
44
8
2
0
1
2.500 500
88
16
3 1
2
5.000
1.000
178
32
6
1
3
10.000 2.000
356
64
11 2
4
20.000
4.000
712
128
22
4
5
40.000 8.000
1.425
253
45 8
6
80.000
16.000
2.850
506
90
16
7
160.000 32.000
5.700
1.012
180 32
8
320.000
64.000
11.400
2.025
360
64
9
640.000 128.000
22.800
4.050
720 128
10
1.280.000
256.000
45.600
8.100
1.440
256
11
2.560.000 512.000
91.200
16.200
2.880 512
12
5.120.000
1.024.000
182.400
32.400
5.760
1.024
13
10.240.000 2.048.000
364.800
64.800
11.520 2.048
Clean
lin
ess class
14
20.480.000
4.096.000
729.000
129.600
23.040
4.096
Increasing the class by 1 causes the particle count to double on average.
