An aerosol distributor and an arrangement for filter leakage detection in a gas filtration system comprising such aerosol distributor, the aerosol distributor being configured to be positioned in a gas stream upstream of a filter, said aerosol distributor comprising: a hollow housing having at least one aerosol inlet for admitting an aerosol from an aerosol source into a chamber inside said housing, and a plurality of aerosol outlet holes for releasing the aerosol from the chamber into a gas stream surrounding the housing, wherein said housing has a plate like shape having an upstream surface configured to face an incoming gas stream and a downstream surface configured to face a filter, wherein said housing comprises a plurality of channels extending between channel inlets at the upstream surface and channel outlets at the downstream surface of the housing, such that gas from the gas stream can pass through the housing.

An aerosol distributor and an arrangement for filter leakage detection in a gas filtration system comprising such aerosol distributor, the aerosol distributor being configured to be positioned in a gas stream upstream of the filter, said aerosol distributor comprising: a housing comprising a primary chamber in fluid connection with two or more secondary chambers; the housing having an inlet for admitting a test aerosol from an aerosol source into the primary chamber and passages for releasing the test aerosol from the primary chamber into each of the secondary chambers; said secondary chambers being elongated and provided with a plurality of outlet holes along the length thereof for releasing the test aerosol from the secondary chambers into a gas stream surrounding the aerosol distributor; characterized in that the dimensions of the inlet, the primary chamber, the passages, the secondary chambers and the outlet holes are selected such that during operation, the pressure of the test aerosol in the primary chamber will be higher than the pressure of the test aerosol in the secondary chambers.

A system (10) for detecting a level of dirtiness of a filter mat (20) of an airflow cooling system for telecommunications equipment, the system (10) comprising a detector (12) for detecting fluorescent or reflected light backscattered at at least one part in (22) of the filter mat (20) comprising or treated with a fluorescent or reflective material, wherein the detector (12) comprises a light source (12a) for illuminating said at least one part (22) of the filter mat (20) with sampling light, and a photosensor (12b) for detecting fluorescent or reflected light backscattered at said at least one part (22) of the filter mat (20) caused by the illumination thereof with sampling light, wherein the system (10) is configured for inferring the level of dirtiness of the filter mat (20) from the amount of detected fluorescent or reflected light.

Embodiments of the present invention relate to apparatuses and methods for leakage detection for installed filters of a multi-filter containment enclosure, without requiring disassembly of the multi-filter containment enclosure. The containment enclosure of the present invention comprises a filter housing. The filter housing comprises one or more filter compartments for housing at least a first filter and a second filter. The filter housing comprises at least one port which is operatively coupled downstream of the first filter and upstream of the second filter. Typically, the at least one port allows for leak testing of the first filter and the second filter without having to remove the first filter and the second filter from the containment enclosure.

A particulate matter detection circuit includes, a negative resistance circuit that couples to a first antenna inserted in a housing accommodating a first filter that filters an exhaust gas, couples to a second antenna inserted in the housing via a matching circuit that performs an impedance matching and a second filter that narrows the frequency band of a passing signal, and oscillates at a resonance frequency of the housing, and a detection circuit that outputs a voltage value corresponding to a signal strength of a radio wave received by a third antenna or the second antenna inserted in the housing. The resonance frequency of the housing varies depending on an amount of matter adhered to the first filter.

A method of integrity testing a porous material is disclosed, providing a porous material suitable for filtration to be tested, said porous material having a first surface and a second surface; wetting said porous material with a wetting liquid; providing a gas stream comprising at least first and second gases humidified with said wetting liquid below the saturation vapor pressure of said wetting liquid and wherein said humidified gas stream has a humidity of 50-99%; introducing said gas stream to said first surface of said porous material; causing said first and second gases to flow through said porous material; measuring the concentration of at least one of said first and second gases in the permeate stream exiting said second surface of said porous material; and comparing the measured concentration to a predetermined concentration.

A honeycomb body having a porous ceramic honeycomb structure with a first end, a second end, and a plurality of walls having wall surfaces defining a plurality of inner channels. A highly porous layer is disposed on one or more of the wall surfaces of the honeycomb body. The highly porous layer has a porosity greater than 90%, and has an average thickness of greater than or equal to 0.5 m and less than or equal to 10 m. A method of making a honeycomb body includes depositing a layer precursor on a ceramic honeycomb body and binding the layer precursor to the ceramic honeycomb body to form the highly porous layer.

A method of integrity testing porous materials that is non-destructive to the material being tested. The method includes humidifying the inlet gas stream to minimize or prevent the porous material from drying out. The inlet gas stream includes at least two gases, wherein one of the gases has a different permeability in liquid than the other, such as oxygen and nitrogen. The permeate gas stream may be subjected to a driving force such as reduced pressure to increase the flow of gases and reduce test time. Multiple porous materials can be integrity tested at the same time, such as by manifolding a plurality of them together. The integrity test is capable of detecting the presence of oversized pores or defects that can compromise the retention capability of the porous material.

Systems and methods for particle leak detection generally include a separation or collection device configured to filter particulate from a stream and a detection device downstream of the separation or collection device. The detection device can be positioned to detect particulate that passes the separation or collection device and can include a probe configured to detect the solid particles. The particle leak detection systems can be configured to be disposed on moveable systems, such as moveable systems in coke oven operations.

A dryer, particularly for drying clean-room garments and accessories, includes a dryer body, a drying chamber, and a system for circulating air between an air intake and the drying chamber. The system includes an air aspiration device giving a direction of air flow from the air intake towards the drying chamber, a device for heating the aspirated air placed upstream of said drying chamber, and an absolute filter provided upstream of the drying chamber. The dryer further includes, upstream of the absolute filter, a connector arranged so as to be connected to a device for supplying air charged with a predetermined quantity of droplets of an aerosol, and in that it has an access to a space located downstream of the absolute filter and upstream of the drying chamber, the access to a space being arranged so as to be able to receive a measuring device.