B.89.809 Rev C
23
© Parker Hannifin, 2015
www.parker.com/hfde
For example: code 20/18/13 indicates that there are between 500,000 and 1,000,000 particles larger than 2 microns, and
between 130,000 and 250,000 particles larger than 5 microns, and between 4,000 and 8,000 particles larger than 15
microns.
Reference ISO 4406:1999
When the raw data in one of the size ranges results in a particle count of fewer than 20 particles, the scale number for that
size range is labelled with the symbol ‘>’.
For example, a code of
14/12/>7
signifies that there are more than 8,000 and up to and including 16,000 particles equal to
or larger than 4µm(c) per 100 ml and more than 2,000 and up to and including 4,000 particles equal to or larger than
6µm(c) per 100 ml. The third part of the code, >7 indicates that there are more than 64 and up to and including 130
particles equal to or larger than 14µm(c) per 100 ml. But the 14µm(c) part of the code could actually be 7, indicating a
particle count more than 130 particles per 100 ml.
ISO4406 particle distribution chart
Including various ISO level contamination grades.
24
8 x 10
6
8 x 10
6
23
4 x 10
6
16 x 10
6
22
2 x 10
6
4 x 10
6
21
1 x 10
6
2 x 10
6
20
500 x 10
3
1 x 10
6
19
250 x 10
3
500 x 10
3
18
130 x 10
3
250 x 10
3
17
64 x 10
3
130 x 10
3
16
32 x 10
3
64 x 10
3
15
16 x 10
3
32 x 10
3
14
8 x 10
3
16 x 10
3
13
4 x 10
3
8 x 10
3
12
2 x 10
3
4 x 10
3
11
1 x 10
3
2 x 10
3
10
500
1 x 10
3
9
250
500
8
130
250
7
64
130
6
32
64
5
16
32
4
8
16
3
4
8
2
2
4
1
1
2
Summary of Contents for icountBS
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Page 30: ...B 89 809 Rev C 30 Parker Hannifin 2015 www parker com hfde ...
Page 31: ...B 89 809 Rev C 31 Parker Hannifin 2015 www parker com hfde ...
Page 32: ...B 89 809 Rev C 32 Parker Hannifin 2015 www parker com hfde ...
