Systems and methods for measuring air restriction in a vehicle are provided. In some aspects, a method includes providing an electrically operable, air restriction device configured to measure an air restriction in at least a portion of a vehicle's air system, and operating the electrically operable, air restriction device using power provided by a power system on the vehicle. The method also includes controlling power to the electrically operable, air restriction device using a hood switch that is connected to the power system.

A filtering detection device mainly comprises a filter, a fan and a detector. The filter is disposed on a machine housing of an electronic device, the fan is disposed at a position corresponding to the filter inside the machine, and the detector is disposed between the fan and the filter. The present invention uses the detector to detect the air flow velocity or flow rate of outside air entering the machine through the filter when the outside air is pumped into the machine through the filter. The detector determines whether the filter is clogged or not by detecting if the air flow rate or flow rate detected by the detector is reduced, then an alarm device electrically connected with the detector can be used to notify a user to replace the filter.

The present disclosure relates, according to some embodiments, to methods of marker based direct integrity testing of at least one membrane comprising: (a) dosing a feed fluid of a loop with at least one marker comprising at least one challenge particle, the loop comprising: the feed fluid; a pump comprising an outlet stream; a membrane module comprising the at least one membrane and a membrane module outlet stream, wherein the membrane module is in fluid communication with the outlet stream; a marker recycle stream in fluid communication with the membrane module outlet stream and the pump; and a means to measure particle concentrations; (b) circulating the feed fluid through the membrane module at least once to produce a filtrate comprising a filtered at least one marker; (c) measuring a filtrate particle concentration of the filtered at least one filtered marker in the filtrate to produce a filtrate concentration measurement; and (d) calculating a log removal value from the filtrate concentration measurement and the feed concentration measurement; wherein the log removal value is less than about 3 m.

A filter monitoring system for a filter in a vehicle air conditioner includes a first temperature sensor to detect an air temperature of intake air drawn into an air conditioner case through the filter, a second temperature sensor to detect an evaporator temperature of the evaporator, and a processor coupled to the first and second temperature sensors and coupled to a memory. The processor is configured to calculate an actual change-rate of the evaporator temperature while a compressor is in operation, calculate an expected change-rate of the evaporator temperature based on the air temperature and operation levels of a blower and the compressor by using predetermined data with a properly functioning filter, calculate a degradation degree of the filter by comparing the actual change-rate to the expected change-rate, and output a signal indicating degradation of the filter upon determining that the degradation degree is out of an acceptable range.

There is disclosed a method of generating an alert relating to a hydraulic actuation system for actuating a hydraulic cylinder, the hydraulic control system comprising a hydraulic fluid tank and a hydraulic fluid filter. The method comprises monitoring the pressure drop over the hydraulic fluid filter; determining a rate of change characteristic relating to the rate of change of pressure drop over at least one time period in which there is a hydraulic fluid flow through the hydraulic fluid filter; determining whether the hydraulic fluid is dirty based on at least the rate of change characteristic; and generating an alert if it is determined that the hydraulic fluid is dirty.

Apparatus and methods for redundant filtration assemblies containing filters comprising a multi-purpose vent port are disclosed, wherein the redundant filtration assemblies reduce the amount of components and overall size of the assemblies, promoting the minimization of product losses. A method(s) to conduct pre-use post-sterilization integrity test (PUPSIT) are also disclosed.

An adjustable filtration assembly performs water filtration tests from a sample point. A container contains a water solution. An inlet valve enables a flow of the water solution into the container. An adjustable pressure regulator valve regulates the flow. A relief valve releases a portion of the water solution when a pressure of the water solution exceeds a threshold pressure. A differential pressure gauge displays a current pressure reading of the water solution in the container, receives adjustments specifying a specific pressure to be maintained, maintains the specific pressure of the water solution, and triggers the relief valve when the pressure exceeds the specific pressure. An outlet valve, when opened, outputs a measured volume of the water solution. A filter membrane mounted in the outlet valve filters solids from the measured volume. A relative plugging index (RPI) of the water solution is determined based on a weight of the solids.

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 monitoring system is disclosed for a heating, ventilation, or air conditioning (HVAC) system of a residential or commercial building. The monitoring system includes an evaporator unit device including a first current sensor that measures current supplied to a circulator blower. The measured current from the first current sensor is used to diagnose a problem with the circulator blower. The monitoring system includes a first temperature sensor that measures refrigerant temperature between a condenser and an expansion valve. The monitoring system includes a second temperature sensor that measures refrigerant temperature between an evaporator and a compressor. The monitoring system includes a condenser unit device that communicates with the evaporator unit device. The condenser unit device includes a second current sensor that measures current supplied to the compressor. The evaporator unit device transmits sensor data to a remote monitoring service over a data network.