In this method, a volume of fluid is passed through a mesh screen with a clearly defined pore size, commonly 10 microns. The pore blockage method is a widely used method of obtaining an automatic particle count.
ISO 4406 PARTICLE COUNT ISO
Instead, most laboratories and users use light blockage for its perceived ease of use regarding sample volumes and its compliance with ISO standard references. Most laboratories offer a package of tests and generally question the value of particle counting when asked specifically to perform this test. However, this comes at a significant cost in terms of time and materials. In all of these cases, these problems can be overcome.
This can be overcome by a method of solvent dilution as prescribed by oil analyzers (CSI’s 5200 Minilab is one such tool).
ISO 4406 PARTICLE COUNT PORTABLE
As the technique was readily available, a number of suppliers provided units for either portable or laboratory applications. Historically, the light extinction principle enjoyed success due to its reference in the ISO standards. Maintaining lower levels of particulates can increase the operational life of lubricated equipment.Īpplications: Systems that rely on clean fluid for proper operation.Ī critical factor to particle counting is how and where the sample is obtained – for samples that will include the particle count test it is recommended that samples be obtained from a turbulent zone such as on an elbow of the return line. High levels of particulates can lead to accelerated machine wear due to abrasive conditions. Higher levels of particulates in the sample may indicate machine health issues, a high rate of external particulate ingression or filter inefficiency.
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. Particle size, µm(c), n-the projected area equivalent diameter of spherical particles passing through the detecting cell in accordance with ISO 11171.Particle Count ISO 4406:1999 Why 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.