Type ERDH.. filter cartridges, suitable for domnick-hunter filter housings, are mainly designed for separating oil vapours from (filtration grade CA with activated carbon filling) or catalytic treatment of (filtration grade CHL with catalyst filling) compressed air flows (dry-type filtration). Both filtration grades are therefore used, if there are no liquid contaminants in the compressed air flow.
ERDH..CA filter cartridges consist of a loose activated carbon granulate filling, ERDH..CHL filter cartridges of a catalyst granulate filling, both embedded between two coarse filter cloths and mesh screens. Furthermore a pleated general purpose filter element (Z) is fully integrated into the cartridge downstream in order to reliably prevent even the finest dust, caused by abrasion, from leaving the filter cartridge.
A transparent perspex cylinder as a main body makes the granulate filling visible, the pleated general purpose filter media is located between two stainless steel cylinders. Both granulate and filter stage are completed / separated by plastic end caps. The adsorptive/catalytic filter stage as well as general purpose filter stage is fully incorporated in a single, compact cartridge unit. As a result a further downstream dust filtration is no longer required.
Cartridges in general offer much higher amounts of granulate fillings compared to same size filter elements. The longish shaped filling bed ensures a long contact time of the compressed air with the granulate and thus a high separation efficiency and long lifetime. The integrated general purpose filter makes a downstream dust filtration by means of a complete separate dust filter unit superfluous (housing and element) and thus re-duces differential pressure and costs - operating as well as investment costs.
All the features mentioned above contribute to a filter cartridge which has a long service life (high granulate amounts) combined with economic efficiency (low differential pressure, investment costs) and maximum operating safety (integrated design).