ISO 11500 Cleanliness Test – Laser Automatic Particle Counter

Hydraulic Fluid Power - Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle

Testing the level of cleanliness is one of the important parameters in the lubricant monitoring program in the system. One method of testing the level of cleanliness is to use an Automatic Particle Counter (APC) with the principle of Light Extinction, it should be noted that this method is not recommended for samples that have two phases, dark in color, and water based oil/free water and are strongly influenced by the presence of bubbles. air. Automatic Particle Counter must be accompanied by Automatic Bottle Sampling (degassing tool) as a tool to remove air bubbles.

Particle sizes that can be measured with this APC tool are >4µm(c), >6µm(c), >10µm(c), >14µm(c), >21µm(c), >25µm(c), >38µm(c ) and >70µm(c). The particle distribution obtained by the tool is reported in the values of ISO 4406 and SAE AS 4059 Tables 1 and 2. The analysis procedure using the laser principle can refer to the Standard Method ISO 11500:2008.