A device for cleaning an end face of an optical fiber may receive a first pressure signal from a first pressure sensor, wherein the device includes a pneumatic circuit, wherein the pneumatic circuit includes: one or more circuit components, the first pressure sensor, and a second pressure sensor. The device may receive a second pressure signal from the second pressure sensor. The device may determine, based on the first pressure signal and the second pressure signal, whether a pressure difference across a circuit component, of the one or more circuit components, satisfies a threshold. The device may perform, based on the pressure difference across the circuit component not satisfying the threshold, one or more actions.

The present invention relates to method of testing the bacterial filtering efficiency of a fabric, the method including the steps of preparing a solution including bacteria, peptone water and NaCl, feeding said solution including bacteria to a nebulizer, generating an aerosol of said bacterial solution and flowing said solution through a cascade impactor to provide a plurality of bacteria colonies in a plurality of plates present in a plurality of stages of said cascade impactor, characterized in that the concentration of NaCl in the peptone water used to prepare said bacterial solution is in the range of 30 g/L to 150 g/L and in that the temperature of said cascade impactor is in the range of −15° C. to 15° C.

The level of cleanliness of a hollow fiber membrane device is evaluated before it is installed in an ultrapure water production system. A method of evaluating the level of cleanliness of the hollow fiber membrane device includes capturing fine particles in permeating water by means of a first filter membrane, wherein the permeating water is ultrapure water that permeates through the hollow fiber membrane device before the hollow fiber membrane device is installed in an ultrapure water production system; and analyzing the fine particles that are captured by the filter membrane.

An embodiment provides a method for determining a filter life, including: introducing an aqueous sample into a filtration device comprising at least one filter and one or more sensors located upstream of the at least one filter, wherein the one or more sensors are capable of measuring a component of the aqueous sample; measuring the component of the aqueous sample using the one or more sensors; identifying a load on the at least one filter based upon the measuring of the component of the aqueous sample and at least one filtration characteristic; and determining the filter life of the at least one filter based upon the identifying. Other aspects are described and claimed.

A method of assessing a membrane, including calculating fluid dynamic characteristics of at least one of a membrane and a material to be passed through the membrane, where the material comprises particles; obtaining characteristic of at least one force acting on the particles of the material to be passed through the membrane due to the interaction between the particles and the membrane, the at least one force being an intermolecular force; combining the calculated fluid dynamic characteristic and the obtained characteristics to assess the flow of the material through the membrane; and optimizing at least one characteristics of the membrane in relation to the material. The membrane includes a plurality of rows and a plurality of teardrop structures arranged in the plurality of rows. The teardrop structures in each row are arranged at substantially the same angle with respect to an anticipated direction of flow through the membrane.

A bioprocessing filtration experiment system for filtering a liquid test medium as part of a filtration experiment in a filtration experiment section of the filtration experiment system, which filtration experiment section runs from a receptacle for holding the test medium to be filtered to a fluid outlet for the filtered test medium, wherein the filtration experiment system is designed to ascertain, as part of the filtration experiment, sensor data as experiment data for at least one filter, said experiment data being able to be taken as a basis for selecting and/or dimensioning the filter of a target system according to predetermined scaling criteria. It is proposed that the filtration experiment system can be preassembled on an at least partially programming-related and/or circuit-related, at least partially fluidics-related and/or at least partially sensor-related basis.

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.

Provided is a lifetime prediction device and a machine tool that enable simple prediction of the lifetime of a filter while suppressing a prediction error with respect to a true value. A lifetime prediction device (88) according to one embodiment is provided with: a pressure acquisition unit (90) that acquires in time series a pressure value of a liquid applied to a filter (52); a time acquisition unit (92) that acquires processing time of a designated process; a calculation unit (94) that calculates the amount of pressure change during the processing time; and a prediction unit (96) that predicts a lifetime period before an upper limit value of the pressure of the liquid applied to the filter (52) is reached, by using the pressure value, the processing time, and the pressure change amount at the time of completion of the designated process.

Improved inspection techniques are described herein for identifying leaks in a plugged honeycomb body. The improved inspection techniques utilize a pore impediment and a test gas. The pore impediment is injected into the plugged honeycomb body, and the test gas is forced into the plugged honeycomb body. A thermal detector is used to collect thermal data from an inspection region of an outlet end of the plugged honeycomb body, and the thermal data is used to identify defects in the plugged honeycomb body.

Provided is a fan filter unit with which the performance of a HEPA filter can be measured at multiple points with ease and in a short time. The fan filter unit has a first HEPA filter, a second HEPA filter, and exhaust means installed between the first HEPA filter and the second HEPA filter. The first HEPA filter, the second HEPA filter, and the exhaust means are integrated by a housing.