Degree of machine contamination

The requirements for a high-pressure unit vary greatly depending on the degree of machine soiling. By developing the following symbols, we want to enable you to determine the right high-pressure unit at a glance, so to speak, in relation to the degree of machine contamination. Due to different configuration options in terms of flow rate and filtration, certain high-pressure units can be the right choice for several requirements. Basically, we differentiate between four machine contamination levels, which are based on the chip volume and chip types within your machining processes.

Degree of contamination for metals (according to fine/coarse chip division)	High-pressure filter concept (combiloop and combistream)	Chip conveyor concept (chipstream and combistream)	Process sequence (empirical values)	Müller contamination symbolism
Up to 30% fine chips	Interchangeable filter 25, 40 or 60 µm	BK10 BK30	Filter cleaning (change) up to once a month Machine tank cleaning up to once a month BK30: Machine tank floor cleaning (manual cleaning maximum twice a year)
Fine chip volume 30 - 50%	Spin-on filter as double changeover filter 25, 40 or 60 µm	BK10 BK30	Filter cleaning (change) possible several times a month Machine tank cleaning up to once a month BK30: Machine tank floor cleaning (manual cleaning maximum twice a year)
Fine chip volume 30 - 70% (high wool / random chip content, fine chip content)	Automatic filter 30 or 40 µm	BK30	Filter cleans itself automatically Floor cleaning Machine tank (manual cleaning maximum twice a year)
Fine chip volume 30 - 70% (high wool / random chip content, fine chip content of floating chips, e.g. aluminium)	Automatic filter 30 or 40 µm	BK30	Filter cleans itself automatically Full-flow filtration Floor cleaning machine tank (manual cleaning maximum twice a year)
Fine chip volume greater than 70%	Automatic filter 30 or 40 µm	BK11 BK31	Filter cleans itself automatically Machine tank cleaning up to once a month BK31: Machine tank floor cleaning (manual cleaning maximum twice a year)
Fine chip content 100% (fine chip brass, high milling content)	Automatic filter 30 or 40 µm	BK31	Filter cleans itself automatically Full-flow filtration Bottom cleaning of machine tank (manual cleaning maximum twice a year)
Ultra-fine contamination over the entire machining process (graphite machining, ultra-fine finishing, high sludge volume, high proportion of grinding processes)	Vacuum rotation filter 6 - 10 µm	BK31	Discharge of chips and sludge via full-flow filtration Machine tank floor cleaning (manual cleaning maximum twice a year)