ISO 4406 is a three part code (e.g. 18/17/13), where the first number encodes the number of particles greater than 4µm in size, the second number refers to particles greater than 6µm, and the third number quantifies particles greater than 14µm (4/6/14). The ISO Code numbers themselves are quantified in the below table. Cleanliness levels are defined by three numbers divided by slashes (/). These numbers correspond to 4, 6 and 14 micron, in that order. Each number refers to an ISO Range Code, which is determined by the number of particles for that size (4, 6 and 14 micron) and larger present in 1 ml of fluid. ISO/FDIS 4406:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical.
ISO 4406:1999 Code Chart Range Particles per milliliter Code More than Up to/including 24 0 8000 4000 200 100 50 2500 17 640 1300 16 320 640 15 160 320 14 80 160 13 40 80 12 20 40 11 10 20 10 5 10 9 2.5 5 8 1.3 2.5 7 0.64 1.3 6 0.32 0.64 UNDERSTANDING ISO CODES.
ISO 4406:2017ISO 4406:2017 specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system. ISO 4406 CODE From To 26 320,000 640,000 25 160,000 320,000 24 80,000 160,000 23 40,000 80,000 22 20,000 40,000 21 10,000 20,000 20 5,000 10,000 19 2,500 5,000 18 1,300 2,500 17 640 1,300 16 320 640 15 160 320 14 80 160 13 40 80 12 20 40 11 10 20 10 5 10 92.5 5 81.3 2.5 70.6 1.3 60.3 0.6 Number of Particles Table 1: ISO 4406:99 Fluid.
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ISO 4406:2017 specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system.
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- Publication date : 2017-08
Corrected version (en) : 2018-03 - Number of pages : 6
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By Barry Verdegan, Ph.D., Research Fellow, Cummins Filtrations, Inc. and Chair, ISO TC 131/SC 6
It has been estimated, in commonly available literature1, that between 75 and 90 percent of hydraulic system failures may be attributed to contamination issues. Automatic particle counting provides a cost-effective way to monitor fluid cleanliness levels and ensure reliable equipment operation. Particle count data is expressed in terms of the number concentration of particles larger than a certain size per unit volume of fluid. Unfortunately, interpretation of the raw particle count data is not always straightforward. Analysts must consider concentration data for at least three different particle sizes.
As shown in Fig. 1, the magnitudes of the concentration data for these sizes typically ranges over 2 to 3 orders of magnitude, while the slope of concentration versus size data provides important context for the interpretation. Fortunately, ISO 4406 provides a simplified method of communicating this complex information in a way that facilitates both interpretation and understanding of particle count data.
ISO 4406 provides a standardized method of reporting particle count data. Commonly known as the ISO Code, ISO 4406 reports data in the form of X/Y/Z, where X, Y, and Z are integers whose values correspond to the number concentration of particles larger than 4, 6, and 14 µm(c). For hydraulic, engine, and aerospace applications involving petroleum-based fluids, particle size is reported in µm(c) to indicate that the particle counter was calibrated according to NIST-traceable ISO 11171. The values of the integers are obtained by relating the actual particle count data to values given in the standard (refer to Table 1 from ISO 4406).
An increase of one ISO code unit corresponds to a doubling in particle concentration. Consider, for example, an oil sample taken from a system that contains 2364 particles per mL larger than 4 µm(c), 876 particles per mL larger than 6 µm(c), 166 particles per mL larger than 10 µm(c), 59 particles per mL greater than 14 µm(c), and 14 particles per mL greater than 21 µm(c). These results are graphically represented in Fig. 1.
To most, this is information overload. On the other hand, this same sample corresponds to an ISO code of 18/17/13. This tells us how clean the oil is and that there are twice as many particles larger than 4 µm(c) as at 6 µm(c) particles, and 16 times as many larger than 6 µm(c) than at 14 µm(c) particles. This can be quickly compared to system cleanliness specifications to determine what, if any, service is required.
ISO 4406 is widely used in hydraulic and diesel fuel applications. It is used to report cleanliness levels and verify pass/fail criteria for new hydraulic oil and diesel fuel shipments. ISO code data from equipment rolling off assembly lines can be used as a quality tool to ensure system cleanliness and reduce warranty costs. It is also used as a tool to track historical fluid cleanliness levels in operating equipment. This enables operators to monitor equipment condition, troubleshoot problems, optimize service intervals, and reduce unscheduled downtime.
Iso 4406 Pdf
Given the importance of contaminant control for hydraulic and diesel engine applications, the value of ISO 4406 in communicating fluid and system cleanliness in a clear, concise manner cannot be overstated.
For more information:Contact Denise Rockhill at drockhill@nfpa.com. Learn more about NFPA and ISO standards at www.nfpa.com/standards.
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1www.machinerylubrication.com/Read/957/hydraulic-fluids-contamination
www.servokinetics.com/over-90-percent-of-all-hydraulic-failures-are-caused-by-this
www.machinedesign.com/hydraulics/contamination-hydraulic-system-enemy-no-1
www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/ct_233707.pdf
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