FCU 8000 series
Overview - ISO 4406 / SAE AS 4059 and NAS 1638 classes
HYDAC FILTER SYSTEMS GMBH
en(us)
Page 106/112
BEWA FCU8000 3109776d en-us 2011-06-10.doc
2011-06-10
Note: increasing the measurement reference by 1 causes the particle count to
double.
Example: ISO class 18 / 15 / 11 means:
Cleanliness class
Particle count / 100 ml
Size ranges
18
130.000 – 250.000
> 4 µm
(c)
15
16.000 – 32.000
> 6 µm
(c)
11
1.000 – 2.000
> 14 µm
(c)
Are in 100 ml of the analyzed sample.
Overview of the differences between ISO 4406:1987 and ISO 4406:1999
"old" ISO 4406:1987
"new" ISO 4406:1999
Size ranges
> 5 µm
> 15 µm
> 4 µm
(c)
> 6 µm
(c)
> 14 µm
(c)
Dimension
determined
Longest dimension of a
particle
Diameter of the
area-equivalent
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
calibration
New NIST
calibration
-----
< 1 µm
4 µm
(c)
5 µm
4,3 µm
6 µm
(c)
15 µm
15,5 µm
14 µm
(c)
