- ISO 4406 PARTICLE COUNT PORTABLE
- ISO 4406 PARTICLE COUNT CODE
- ISO 4406 PARTICLE COUNT ISO
- ISO 4406 PARTICLE COUNT SERIES
By testing systems regularly required cleanliness levels can be maintained and potential warning signs identified. In the case of cleanliness you should consult your oil and/or equipment suppliers to ascertain the recommended cleanliness levels for the equipment being used. Incorrect sampling can introduce extraneous particles into the sample bottle which will lead to incorrect results and impact on maintenance decisions. Regardless of the test method used, it’s critical to take a relevant and representative sample. Gear Motor:20/18/15 filtration 25 microns, pressure <2000psi Servo Valve: 16/14/11 filtration 3 microns, pressure <2000psi Variable piston pump:18/16/13 filtration 6 microns, pressure < 2000psi
ISO 4406 PARTICLE COUNT ISO
Note: ISO 4406 is a classification system, not a test procedure Some example cleanliness targets
ISO 4406 PARTICLE COUNT CODE
Automatic particle counters will print out this code automatically. Each group is then assigned a range code as per the following table. The quantities measured are grouped by their particle sizes (>=4μm(c), >=6μm (c), >=14μm (c))ģ. Particle Count ISO 4406:1999 Why Particle Counting Whether you are looking for early signs of bearing wear, ensuring that a hydraulic fluid is good for service, or evaluating the performance of a filter in the field, particle counting offers a plethora of information for what is by comparison precious little money. The number of “particles” in the oil are counted and measured per ml of oilĢ. Process for making ISO Code Designationġ. In this standard the particles are reported in 3 size categories: >= 4µm/>= 6µm/>= 14µm.įor each category a code is designated. The most common method of reporting the particle count is covered by the global standard ISO 4406. Includes ISO 4406 particle counts of 4 micron, 6 micron, and 14 micron. the above instrument uses a vacuum system to remove any air bubbles. Therefore the area taking the samples and the testing laboratory must be aware of these potential issues and treat the sampling and testing accordingly, e.g. Also samples with a viscosity greater than 320cSt may need pre-treatment. There can be problems with dark fluids, water in the oil, air bubbles or a large number of silt particles (~2µm). This laboratory method uses a laser beam to count and measure the particles as the oil passes through the beam.
ISO 4406 PARTICLE COUNT PORTABLE
These come in laboratory scale units (example pictured below) and portable units for field use. with automatic particle counters calibrated in. In this article we will be discussing the Automatic Optical Particle Counting method as this is the most widely used. International Standard ISO 4406 was prepared by Technical Committee ISO/TC 131, Fluid power systems. There are three basic methods used, Automatic Optical Particle Counting (ISO 11500), Optical Microscopy (ISO 4407), and Pore Blockage Particle Counting (BS3406). It can also be used to look for early signs of bearing wear or evaluating equipment filter performance. Most equipment manufacturers will list guidelines as to what cleanliness code is acceptable, and that’s all you need to know.This technique is typically used for critical hydraulic and turbine systems which have very small clearances, e.g. However, different oils can have different allowances for what we deem “clean” or “dirty.” The chart below shows the clean to dirty ranges for four types of oil:īut wait! How do we arrive at the 18/17/15 or 17/15 range? Using this chart:Ĭonfusing, right? That’s why we use the code. The higher the ISO Code, the dirtier the oil. To make the numbers less cumbersome, they are converted to number codes, as in the following table. The chart does not list the actual number of particles counted at 5 and 15 microns. ISO standard 4406:1999 provides a way of summarizing the distribution of contaminants in a fluid by counting the particles per 100ml sample of hydraulic fluid: the figures are cumulative. Those two numbers (17 and 15) identify a range of particles counted in the size above 5 and 15 microns in size. The ISO 2-number code in this example is 17/15. These three numbers (18, 17, and 15) identify a range of particles counted in the size above 4, 6, and 14 microns, respectively.
The ISO 3-number Code in this example is 18/17/15.
In the chart below, the number of particles larger than 14 microns in size was 169.2. The right column is the number of particles per mL of sample that were found to be larger than each micron size. The left column shows the size in microns. Every particle count test by Blackstone is reported in ISO 4406 (2- and 3-number codes), NAS 1638, and SAE AS4059 formats.
The particles are counted in six different size ranges (see the sample Particle Count test results below). Below is a particle count report for hydraulic oil. In oil laboratories, automatic particle counters determine the ISO code.
ISO 4406 PARTICLE COUNT SERIES
Without the use of the ISO Code, a confusing series of numbers would have to be examined to determine how clean an oil is. The test is commonly referred to as the particle count. The ISO Code is a system for representing particle concentrations in oil.