Find the right air filter for your application – but where are air filters actually used?
Every modern and powerful machine or vehicle requires compatible high-performance fluid filters, air filters, and filter components. Our air filters can be used in a wide variety of sectors – construction machinery, agricultural machinery, compressors, vacuum pumps, general mechanical engineering, engine and transmission construction, locomotives, commercial and special vehicles – so it goes without saying that ELSÄSSER Filtertechnik can offer and supply tailored concepts and solutions that meet your specific requirements.
How does an air filter work?
The contaminated air hits the air filter cartridge via the air-intake nozzle. Ideally, this air is drawn in via a cyclone or is directed into the air filter housing via a dust discharge valve that allows most of the impurities to be removed by means of tangential flow filtration. The residual dirt is then removed by the filter cartridge. The cleaned air is sucked through the clean-air nozzle to the consumer, e.g., the engine, driver’s cab, equipment compartment or engine room.
Which filter media are available?
Standardized cellulose filter media are primarily used in automotive, construction, agricultural machinery, and compressor applications. Alternative options include polyester media and high-efficiency glass fiber media – and more recently, also nanoweb media.
Which materials are used for the air filter housings?
The filter manufacturers are now exclusively using various plastics for their new products, usually with a glass fiber mix. Naturally, the ELSÄSSER Filtertechnik product range includes all kinds of plastic filter housings as well versions made from other materials, such as painted steel, galvanized steel, chemically nickel-plated steel as well as V2A and V4A – and other materials on request.
How is the dust capacity of an air filter calculated?
The dust capacity is determined by the available filter surface. The air volume or flow rate (nominal flow rate) is specified, e.g., in m³ / min, cfm, l/h; the available filter area is specified in cm² or m², and the expected amount of dirt in mg/m³ or g/m³. These variables are then evaluated in relation to each other. On the test bench, they can be used to determine the filter’s laboratory service life, laboratory dust capacity, dust concentration, and operating hours. Special ISO test dust is used as the test medium. This is a standardized test dust that is available with various precisely defined particle sizes and quantities in ISO fine and ISO coarse variants.
The filter’s effective flow resistance is calculated by comparing its initial and final flow resistance when it is subjected to dust loads. When calculating the initial flow resistance, the additional flow resistance caused by pipes, pipe elbows, flexible intake lines, cyclones, and rain caps must also be taken into account. The final resistance is specified by the manufacturer of the engine or equipment.
The air filter can be subjected to different dust concentrations on the test rig. This enables the test engineers to calculate the expected operating hours with great accuracy. In turn, this allows us to give our OEM customers very precise recommendations with regard to maintenance intervals and service hours.
The engineers at ELSÄSSER Filtertechnik GmbH will be glad to answer any questions you may have.
Air filter maintenance
An air filter must be checked after a specified maintenance interval, which is determined by the machine manufacturer. A maintenance switch, service indicator, visual maintenance indicator or even electronic service indicator can also be used to constantly monitor the air filtration system. The filter element should be replaced when the specified number of operating hours or maximum mileage is reached. Likewise, the service indicator shows when a filter change is recommended.
Why are air filters necessary?
Air filters are used to filter air for combustion in engines, intake air for compressors, as pollen filters, aerosol filters, and activated carbon filters for cabin air filters and engine room filters, for equipment ventilation, as vent filters and breather filters in hydraulic systems, as dust-removal filters, in air-conditioning systems and painting systems, and in vacuum filters!
What types of air filters are there?
A distinction is made between:
Main air filters
Main filter elements
Secondary air filters
Safety air filters
Safety elements
Oval filters, filter cells
Filter mats
Pre-filters
Main filters
Cyclones
Fine filters
Dry filters
Wet filters
Centrifuges
Single-stage filters
Two-stage filters
Combination filters
Hybrid filters
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