Argo-Hytos OPCom - 17. Classification Systems; 17.1.1 ISO 4406:17 Classes

Subject to change · V 2.02.20 · EN
Page 54
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17. Classification systems
ISO-MTD > 4 µm(c) > 6 µm(c) > 14 µm(c) > 21 µm(c) > 38 µm(c) > 70 µm(c)
ACFTD > 2 µm > 5 µm > 15 µm > 25 µm > 50 µm > 100 µm
17.1.1 Cleanliness classes according to ISO 4406:17
The values are added in cumulated form (all particles >4 µm. all particles > 6 µm. …).
Concentration in particles / ml
ISO 4406:17 Display OPCom
From up to and including
2,500,000.00 > 28 28
1,300,000.00 2,500,000.00 28 28
640,000.00 1,300,000.00 27 27
320,000.00 640,000.00 26 26
160,000.00 320,000.00 25 25
80,000.00 160,000.00 24 24
40,000.00 80,000.00 23 23
20,000.00 40,000.00 22 22
10,000.00 20,000.00 21 21
5,000.00 10,000.00 20 20
2,500.00 5,000.00
19 19
1,300.00 2,500.00 18 18
640.00 1,300.00 17 17
320.00 640.00 169 16
160.00 320.00 15 15
80.00 160.00 14 14
40.00 80.00 13 13
20.00 40.00 12 12
d=17 µm
Particle
A=153,9 µm²
A= 153,9 µm
2
d=14 µm(c)
Table 35: Comparison of particle size ISO-MTD - ACFTD
ACFTD particle size ISO MTD particle size
definition (ISO 4402:1991) definition (ISO 11171)
Fig. 31: Particle size definition
The automatic particle counter (APC). which is used for the calibration of the OPCom particle monitor is primary calibrated according
to ISO 11171.
The ordinal numbers of the OPCom particle monitor are displayed according to ISO 4406. these are determined by the measured
particle concentration for 4. 6. 14 and 21 µm(c).
For the successor of NAS. SAE AS and for the GOST standard. other size classes are used. The sizes can be converted with a small
loss of accuracy.
17.1 Definition of particle sizes
In industrial hydraulics. the particle numbers are coded according to ISO 4406:1999. With the replacement of the test dust ACFTD by
ISO MTD. the particle sizes have been redefined.
The size specification in µm(c) is the diameter of a circle having the same area as the projected area of the detected particle.
The size specifications of ISO-MTD and ACFTD can be converted into each other. See table below.
Table 35: Comparison of particle size ISO-MTD-ACFTD