FluidControl Unit - FCU 1000 Series
HYDAC Filtertechnik GmbH
en
Page 57
BeWa_FCU1000_3371346a_en.doc
2007-12-04
Note: increasing the measurement reference by 1 causes the particle count to double.
Example: ISO class 18 / 15 / 11 means:
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)
found in 1 ml of an analyzed sample.
15.1.2 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 ultrafine
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)