Specifications

ContaminationSensor CS 1000 Cleanliness classes - brief overview
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en(us)
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BeWa CS1000 3764916 300 en-us 2012-08-29.doc 2012-08-29
Cleanliness Class - NAS 1638
Like ISO 4406, NAS 1638 describes particle concentrations in liquids. The analysis
methods can be applied in the same manner as ISO 4406:1987.
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
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.