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Sampling over a precise time period and trending is vital as the difference between a 17/13/9 report and a 18/13/9 report could be 1 particle or it could be 1200. Thus the number of particles in 1 ml of fluid ≥14µ or over is anywhere between 2.5 and 5. This gives us rounded up figures of 2.5 and 5. The ≥14µ or larger particle count is represented by 9 - this equates to the number of particles at that size somewhere between 2 8 2 9 divided by 100 (remember the 256 and 512). The ‘actual’ particle count would be somewhere between ½ of that number and the number. The result is then divided by 100 and rounded to give the maximum number of particles of a certain size or larger that can be expected in a 1 ml fluid sample. Note that the number stated is the power to which 2 is multiplied. The third number gives us the range of particles in the 14µ or larger range in 1 ml of sample. The second number gives us the range of particles in the 6µ or larger range in 1 ml of sample.
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The first number gives us the range of particles in the 4µ or larger range in 1 ml of sample. This gives us two pieces of information both the size and the quantity of the particles.
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Worked example: 17/13/9 (remember each number set is 4µ, 6µ and 14µ respectively) Reverting to the figure the 9 count means we are to expect between 2.5 and 5 counted particles in every 1 ml of sample fluid. This is further complicated as what is actually reported is the maximum contamination level to be found in only 1 ml (i.e. That in itself does not mean there were 512 particles counted – it actually means that the number of particles was between 2 8 (i.e. 512 number of particles and we would record the number 9 as the count. For example, if there was a count of 512 particles in a 100 ml sample of fluid that would be 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 or 2 9 i.e. It is described by a number of particles related to the factor of 2. The concept of particle counting can be confusing as it is not an actual precise count.
ISO 4406 PARTICLE COUNT ISO
If you have any questions do not hesitate to contact us at ISO 4406 Method For engines designed to achieve Euro 2, 3, 4 and 5 emission standards, clean fuel is important. It is also referred to as the ISO cleanliness code.
ISO 4406 PARTICLE COUNT CODE
Please see below a comprehensive explanation of the ISO 4406 method. ISO4406:2017 is the internationally recognised cleanliness code for measuring the solid particulate content of fuel samples and hydraulic fluid. We will cease reporting to NAS1638 for all Marine applications. Reporting at ≥4µ, ≥6µ and ≥14µ as opposed to the two digit code method of ≥5µ and ≥15µ. Particle size, µm(c), n-the projected area equivalent diameter of spherical particles passing through the detecting cell in accordance with ISO 11171.ISO CLEANLINESS CODE FOR HYDRAULIC FLUID CONTAMINATIONĪs part of our program to continually evaluate industry standards to ensure the most accurate analysis for our customers we will now use the ISO 4406 (2017) 3 digit code standard for particle counting. Particle count, n-the sum of the number of solid particles and dispersed water droplets. Particles, n-solid particles and dispersed water droplets which are detected and counted by this test method. ISO 11500, Hydraulic fluid power – Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principleĭefinitions of Terms Specific to This Standard: ISO 11171 Hydraulic Fluid Power- Calculation of Automatic Particle Counter for Liquids ISO 4407 Hydraulic Fluid Power- Fluid Contamination- Determination of particulate contamination by the counting method using an optical microscope The measuring result of an optical particle counter includes as well important ranges that are not covered by International standards such as ASTM, ISO and SAE among others. The optical PAMAS particle counters exceed the requirements of common cleanliness standards and provide a detailed particle size distribution for up to 32 size areas. Proper care should be taken during sample procurement to ensure that the sample obtained is representative of the fluid circulating in the system. These factors include procurement of sample, particle counting accuracy and the sample container (where used), and its cleanliness. Particle counts are affected by a variety of factors. Particles can shorten the lifetime of fuel systems components, fuel pumps, injectors and other devices. A reliable determination of size and particle distribution in hydraulic fluids and other products constitutes a valuable tool not only to more precisely determine the product specifications but also to monitor fuels and in-service oils and optimize preventive maintenance programs of engines and machinery reducing downtime and repair costs avoiding unnecessary unscheduled costly repairs.