E1-12, E3-12, E5-12, E7-12, and E9-12 are classic Hankison precision filter cartridge models for industrial compressed air systems. These cartridges are typically used in series or in combination according to specific air source quality requirements. The number -12 represents the filter's pipe connection specification (or flow rate), while the letter prefixes (E1 to E9) represent different filtration precision levels and functional divisions:
Filter Cartridge Classification and Function Details
E9-12 (Main Line Filter / Coagulation Grade) Function: Used for initial protection of the system's main pipeline. It effectively filters out large amounts of liquid and solid particles up to 3 microns in size. Residual oil content: Maximum permissible residual oil content is 5 ppm w/w.
E7-12 (Air Line Filter / Moisture Removal Grade) Function: Typically installed upstream of a refrigerated dryer, used to filter out liquid water and lubricating oil. Can intercept solid particles as small as 1 micron. Residual Oil Content: Maximum permissible residual oil content is 1.0 ppm w/w
E5-12 (High-Efficiency Oil Removal Filter / Ultra-coagulating Grade) Function: Typically installed downstream of refrigerated dryers or desiccant dryers, providing higher precision protection. Filters out liquid and solid particles as small as 0.01 microns. Residual Oil Content: Maximum permissible residual oil content reduced to 0.01 ppm w/w
E3-12 (Ultra-High Efficiency Oil Removal Filter / Micro-coagulating Grade) Function: Suitable for processes with stringent requirements for air source cleanliness. Intercepts condensates and particles as small as 0.01 microns. Residual Oil Content: Maximum permissible residual oil content controlled at an extremely low level of 0.001 ppm w/w
E1-12 (Activated Carbon Adsorption Filter / Deodorizing Grade) Function: Primarily used to remove oil vapor and odor from the system. Typically must be installed after E3 or E5 filter cartridges for high-level applications such as food, pharmaceutical, and respiratory gases. Residual oil content: The maximum permissible residual oil content is only 0.003 ppm w/w