A filter, a method of operating and a method of making is provided. The filter includes multiple filter layers in plurality with the structural integrity of the filter as a whole. The layers are perforated to allow any type of filtering such as but not limited to osmosis filtering, reverse osmosis filtering, static filtering, and sifting or sieve-like filtering effect as the media being filtered passes through the layers as the outermost layer collects most debris. The layers further have an adhesive relationship with each other layer and an optional base layer, so that each layer may be individually removed and the one beneath is exposed as a cleaner filter surface.

A method for determining an airflow volume through an air filter is presented. A negative pressure is created within a system housing of an air handling system. Particulate matter is filtered on a filter media of an air filter. A displaceable baffle is progressively moved baffle in proportion to an accumulation of particulate matter on the filter media, wherein the displaceable baffle is movably mounted within a bypass conduit of an airflow sensor device. An output voltage is identified from a magnetic field sensor, wherein the output voltage is proportional to a magnetic flux density of a magnetic field from an actuation magnet mounted on the displaceable baffle. A position of the displaceable baffle is determined based on the output voltage generated by the magnetic field sensor. An accumulation of particulate matter on the filter media is determined based on the position of the displaceable baffle.

A method for predicting the residual useful life of an air filter arrangement is described. The method comprises the following steps: providing a plurality of predetermined reference degradation curves; measuring a degradation parameter of the filter arrangement; estimating the residual useful life of the filter arrangement by comparing the predetermined reference degradation curves and an actual degradation curve defined by measured values of the degradation parameter.

A trap bowl is provided to accumulate liquid droplets from a filter, as a liquid content. The trap bowl includes a transparent vertical prism. The transparent vertical prism includes a face that forms a vertical transparent surface facing against a content of the section. The face can provide a first angle of total reflection when content of the section is a type of gas, and a second angle of total reflection when the content of the section is the liquid content. A light source may emit a light beam incident on the face at an angle of incidence. The angle of incidence results in reflection of the light beam, striking the light receiver, when the face has the first angle of total reflection, and results in refraction of the light beam, missing the light receiver, when the face has the second angle of total reflection.

A centrifugal liquid separating system broadly comprises an insert cartridge including a housing, an inlet, one or more flow guides, a stator, a compression nozzle, an expansion nozzle, and an outlet. The flow guides guide liquid flowing into the inlet past the stator into the compression nozzle. The stator induces a rotational vortex into the liquid flow. Liquid with heavier particles in the liquid flow is urged to the outside of the rotational vortex. Liquid with lighter particles and cleaner liquid is urged to the inside of the rotational vortex. The compression nozzle and the expansion nozzle are aligned to cooperatively form an annular liquid channel. The liquid with the heavier particles flows through the annular liquid channel and the liquid with the lighter particles and the cleaner liquid flows to the expansion nozzle to the outlet.

An air purification unit is provided for individuals seated at a table that has a unit body adapted to be mounted at a mounting height at or above the approximate head height of individuals seated at the table, and in a position between the individuals. A motorized fan system is provided within the unit body that is configured to draw air from at least one inlet proximate the bottom of the unit body. A filter is positioned in communication with the inlet and the fan system for filtering air drawn through the inlet. The unit body has at least two ducted outlets disposed radially or axially for discharging filtered air toward the individuals, while the unit prevents cross-flow of breath air between the individuals.

An air cleaning device is provided. The air cleaning device includes: a main body; a filter configured to be disposed in the main body to purify air; and an image transmitter configured to show a state of the filter to an outside of the main body.

The invention discloses a dust detection method and system and a signal processing unit thereof to detect the dust in the net gas output by different gas-solid separation units. The method according to the invention comprises a signal acquisition section acquiring the target signal with the dust detection components arranged at the net gas output sides of different gas-solid separation units, a signal transmission section transmitting the target signal acquired by the signal acquisition section, and a signal processing section receiving and processing the target signal transmitted by the signal transmission section and outputting the detection results; the dust detection components of the signal acquisition section are arranged on the confluence channel that is connected with the net gas output sides of the different gas-solid separation units, and are respectively arranged behind the connection points on the confluence channel for connecting with the net gas output sides of the different gas-solid separation units.

Disclosed is a system for suctioning braking particles from a friction braking system of a vehicle, the suction system including a negative-pressure source, a suction mouth, a filter, a pneumatic circuit connecting the suction mouth to the negative-pressure source, and a control unit configured to control the negative-pressure source, the suction system also including a pressure sensor for measuring the pressure prevailing in the pneumatic circuit, the control unit controlling the negative-pressure source so that the pressure in the pneumatic circuit reaches or tends to meet a predetermined negative-pressure setpoint, and an associated method.

The invention relates to a filter arrangement comprising a filter cartridge, having an opening and a wall which is formed by a filter medium and has an inner side delimiting a clean side of the filter and an outer side delimiting a raw side of the filter, a fan for conveying air to be purified first through the wall and subsequently through the opening of the filter cartridge, and a purification device, which is configured to convey a jet of compressed air through the opening into the filter cartridge and through the out of the filter cartridge, for conveying dirt away from an outer wall of the wall. The invention also relates to a method for detecting a leak of a filter cartridge, wherein the filter cartridge has an opening and a wall which is formed by a filter medium and has an inner side delimiting a clean side of the filter and an outer side delimiting a raw side of the filter.