Updated: 52 min 9 sec ago
There are three principal methods to measure the contamination level in a component, circuit, or system. The methods are Gravimetric Measurement (ISO 4405); Particle Size Distribution Analysis (ISO 4406 or NAS 1638); Maximum Particle Size Analysis (ISO 4407).
Maximum Particle Size Analysis (ISO 4407)
This evaluation is done using a microscope. A microscope is used to identify and measure the size of individual pieces of contaminant. Particle size is important in reference to maximum clearances of hydraulic components.
Whether hydraulic assembly cleanliness applies to you or not, it is worthwhile to understand the significant impact that contamination levels can have on the life of hydraulic system components.
Implementing a thorough cleanliness system may have a significant impact on warranty returns for hydraulically powered equipment.
There are three principal methods to measure the contamination level in a component, circuit, or system.
The methods are: Gravimetric Measurement (ISO 4405); Particle Size Distribution Analysis (ISO 4406 or NAS 1638); Maximum Particle Size Analysis (ISO 4407). This discussion will cover Gravimetric Measurement.
Gravimetric Measurement (ISO 4405) is a reporting method that references the total mass ofcontaminant found in a hydraulic component. This total mass of contaminant measurement is then normalized by the total internal component surface area of a hydraulic component. A fluid is used to dislodge contamination in a hose assembly and is then poured through a membrane catch filter.
An analytical balance is used to measure the total mass of contaminate which has been flushed out of a component. The total mass of contaminate and is referenced to the surface area or volume of the assembly.
Gates currently offers a system of four Gravimetric measurement (ISO 4405) levels of cleanliness for hydraulic assembly that can be used to meet or exceed cleanliness requirements.