SEAL 9U8140 - Caterpillar

Table 2
Beta Ratio     Particles Entering Filter     Particles Passing Through Filter     Filter Efficiency    
Beta 75     75     1     98.67%    
Beta 200     200     1     99.5%    The equation to convert the Beta ratio of a filter to efficiency number is:% Efficiency = 1 - (1 / beta ratio)Filter Capacity
Filter capacity is a measure of the mass of contaminants that can be trapped by the filter media. Filter capacity is dependent on the media type and the amount of the media. Cat filters are high-quality filters and hence offer an optimized filter media area to trap contaminants expected to be generated in a specific compartment. Filter capacity is expressed in a plot of "Delta Pressure" across the filter versus the mass of contaminants in the fluid.When filters reach capacity, the filters start to plug. Some filtration systems are designed with a warning signal to indicate to the operator that the filter is plugged. The warning signal operates by measuring the pressure difference across the filter. If the designated pressure is exceeded, the signal is triggered. Filtration systems that are not equipped with a warning signal are designed to be changed at specific service intervals. Refer to this Special Publication, "Filter Bypass". Refer to the Operation and Maintenance Manual of your machine or engine for the filter service interval.Cat fluid filters are designed with optimized capacity and rating for Cat equipment. Cat offers fluids filters of three efficiency levels:
Standard Efficiency
Advanced High Efficiency
Ultra High EfficiencyTable 3 provides the typical micron rating categories for fluid filters offered by Caterpillar.
Table 3
Cat Fluid Filter Options    
Filtration Type     Standard Efficiency     Advanced Efficiency     Ultra High Efficiency    
Engine Oil Filters     27 - 40 µm (absolute)     10 - 27 µm (absolute)     6 - 12 µm (absolute)    
Hydraulic Filters     27 - 40 µm (absolute)     10 - 27 µm (absolute)     5 - 10 µm (absolute)    
Powertrain Filters     27 - 40 µm (absolute)     10 - 27 µm (absolute)     5 - 10 µm (absolute)    
Fuel Filters     > 10 µm (absolute)     5 - 10 µm (absolute)     < 4 µm    
Fuel/Water Separators     > 20 µm (absolute)     10 - 20 µm (absolute)     5 - 10 µm (absolute)    Note: Substituting a higher-efficiency filter than recommended is typically safe. Substituting a lower efficiency filter than recommended is not acceptable.In order to choose the appropriate filter size, efficiency and capacity, refer to your machine or engine Operation and Maintenance Manual and consult your local Cat dealer.Filter Bypass
When a fluid filter is full of contaminants to the designed capacity, the filter is called plugged and dirty lubricant will bypass the filter. The dirty lubricant will flow through the system without cleaning, if the system is equipped with a bypass valve. If equipped, an alarm is triggered when the filter plugs. Bypass is designed into filter bases so that engines and