FluidControl Unit - FCU 1000 Series
HYDAC Filtertechnik GmbH
en
Page 59
BeWa_FCU1000_3371346a_en.doc
2007-12-04
15.2.2.2
Specifying a cleanliness class for each particle size
Example: Cleanliness class according to AS 4059: 7 B / 6 C / 5 D
Cleanliness class
Particle count / 100 ml
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
15.2.2.3
Specifying the highest cleanliness class measured
Example: Cleanliness class according to AS 4059 6 B – F
The 6 B – F specification requires a particle count in size ranges B – F. The respective
particle concentration of cleanliness class 6 may not be exceeded in any of these ranges.
15.3 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 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
Cleanliness 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.
