Glossary
ContaminationSensor CS 1939
en
Page 42 /
48
BeWa CS1939 3978342c V100 en-us 2019-10-08.docx
2019-10-08
Note: increasing the measurement reference by 1 causes the particle count
to double.
Example: ISO Code 18 / 15 / 11 says:
Cleanliness class
Particle count / ml
Size ranges
18
1,300
– 2,500
> 4 µm
(c)
15
160
– 320
> 6 µm
(c)
11
10
– 20
> 14 µm
(c)
Overview of modifications - ISO4406:1987 <-> ISO4406:1999
"old" ISO 4406:1987
"new" ISO 4406:1999
Size ranges
> 4 µm
(c)
> 5 µm
> 6 µm
(c)
> 15 µm
> 14 µm
(c)
Dimension
determined
Longest dimension of
a particle
Diameter of the
coextensive circle
ISO 11171:1999
Test dust
ACFTD - dust
1-10 µm ultra
fine fraction
ISO 12103-1A1
SAE Fine,
AC
– Fine
ISO 12103-1A2
SAE 5-80 µm
ISO MTD
Calibration dust
for particle
counters
ISO 12103-1A3
SAE Coarse
Coarse fraction
ISO 12103-1A4
Comparable size
ranges
Old ACFTD calibration Comparable
ACFTD dusts
New Nist calibration
-----
< 1 µm
4 µm
(c)
5 µm
4.3 µm
6 µm
(c)
15 µm
15.5 µm
14 µm
(c)
