Abstract: A leak testing device includes a body portion and a purge gas supply. The body portion defines a cavity. The cavity is operable to enclose a portion of a part to be leak tested. The body portion also comprises at least one fluid port operable to deliver a purge gas to the cavity. The purge gas supply is in fluid communication with that at least one fluid port. The purge gas supply is configured to supply a purge gas through the at least one fluid port. The purge gas is operable to purge the cavity of at least a portion of an atmospheric tracer gas contained in the cavity.

Abstract: A fuel vapor leak detection device for detecting a leakage of fuel vapor includes a pump which pressurizes or depressurizes insides of a fuel tank and a canister, a motor which drives the pump, an electrical current detector which detects a current value applied to the motor, a switching valve, and a controller. The switching valve includes an air passage having a narrowing part therein and communicating with atmosphere, a first passage connecting to the pump, a canister connection passage connecting to the canister, and a second passage connecting to the pump. The controller controls a switching operation of the switching valve based on the current value detected by the electrical current detector to select one of a communication between the air passage and the first passage, and a communication between the canister connection passage and the second passage.

Abstract: The present invention relates to a device for testing resist pressure of a vessel wherein gas is stored at a high compressed state, before the use of the vessel, and to a method for testing resist pressure of a vessel by using the testing device. The device includes: the vessel provided as an object to which a resist pressure test is carried out; an elastic tube placed in the interior of the vessel and adapted to fill a liquid into the interior thereof; a pressurizing means adapted to apply a predetermined pressure to the elastic tube to allow the elastic tube to be expanded; and a pressure gauge adapted to gauge the pressure in the interior of the vessel, wherein a gas is filled into the vessel to apply a predetermined pressure to the interior of the vessel by the expansion of the elastic tube.

Abstract: In a method for detecting a leak in a double pipe, a medium located in an intermediate chamber between the interior and exterior pipe is moved toward a first end of the pipe, whereupon the medium flows in from the second end. On the first end the medium is examined for any leakage of a characteristic material, upon the detection of which a leakage signal is generated and a location of the leakage is calculated based on the transport time of the characteristic material from the leakage to the first end and on the mass flow of the medium. A corresponding device contains a conveyor unit for moving the medium through the intermediate chamber. A material sensor is disposed at the first end for examining the medium for the characteristic material. A control and analysis unit is provided for generating a leakage signal and calculating the location of the leakage.

Abstract: Method for locating pressure losses in vacuum bags used in the manufacturing of composite material parts, according to which the vacuum bag with a part in its interior coated by airweave at a pressure lower than atmospheric pressure, is exposed to contact with a gas dispersion at atmospheric pressure of solid suspended tracing particles, preferably tar, which in the event of there being pressure losses in the vacuum bag, are deposited in the airweave areas close to them. The contact between the vacuum bag and the gas dispersion is performed preferably through an applier of said gas dispersion over the vacuum bag through an application device, either in open surroundings or in closed surroundings such as an autoclave.

Abstract: An apparatus for testing a protective mask. The apparatus includes a testing unit for testing a protective mask. The testing unit includes a headform upon which a protective mask to be tested is mounted. The testing unit is configured to take a sample of the challenge from two different locations about the protective mask. The testing unit may also be configured to inflate and deflate a neck seal protective mask when mounted on the headform prior to performing a mask leakage test to eliminate or significantly reduce pockets or folds that may hide a leak.

Abstract: Approaches for a testing apparatus for evaluating a cover of a hard-disk drive. The testing apparatus may detect whether the cover has a defect that prevents the cover from being sufficiently airtight. The testing apparatus includes a base structure that comprises a concave recess shaped to receive the cover to be tested. When the cover is disposed within the concave recess, the cover forms a first chamber in the concave recess between the cover and the base structure. The testing apparatus also includes a removable lid. When the removable lid covers the concave recess with the cover disposed therein, the removable lid forms a second chamber in the concave recess between the cover, the base structure, and the removable lid. The testing apparatus also includes a means for introducing helium gas to one of the chambers and a means for detecting how much helium gas leaks from that chamber.

Abstract: The invention relates to a sniffing leak detector comprising a sniffing line (11) and a feed line (33) that leads to a vacuum pump (16). A distribution point (24) from which a branch line (25) leads to a test gas sensor (15) is provided on the feed line (33). In order for the intermediate pressure (P2) at the distribution point (24) to be independent of feed fluctuations of the vacuum pump (16), a throttle (D2) comprising a supercritically operated orifice (20) is provided between the distribution point (24) and the vacuum pump (16). The pressure drop at the orifice (20) is greater than half the intermediate pressure (P2) at the distribution point (24). The flow at the orifice (20) is thus blocked, wherein the flow (Q) remains constant regardless of changes of the pump pressure (P3). Changes of the intermediate pressure (P2) are thus prevented so that the sensitivity and signal stability of the test gas sensor (15) is unaffected by changes of the pump pressure.

Abstract: A sniffing leak detector which comprises a mass spectrometer, a turbomolecular pump and a forevacuum pump. In case that the sniffing hose with the hand-operated sniffing probe becomes detached from the main device, atmospheric pressure would pass into the gas inlet conduit and disrupt the high vacuum in the mass spectrometer. In order to protect the mass spectrometer and the vacuum pump apparatus, a flow restrictor with an upstream filter is arranged in the gas inlet conduit.

Abstract: To achieve a large measurement range from small up to larger leakage rates, a switchover from normal operation to gross operation occurs. In gross operation, the sucked-in gas flow is separated by different throttles, wherein the throttle that leads to the test gas sensor has a low flow rate. This manner of operation prevents a too large quantity of test gas from reaching the sensor surface and contaminating the sensor. In another alternative, in gross operation the test gas flows only across a part of the sensor surface. The other part is flushed.

Abstract: The present invention relates to methods and systems for detecting leaks in a head space sampling device. One exemplary method for detecting leaks in a head space sampling device includes establishing fluid communication between a head space and a pressurization gas conduit. Gas pressure and flow rate are monitored within the pressurization gas conduit during pressurization of the head space. Changes in monitored gas pressure and flow rate are used to evaluate whether a leak exists within the head space sampling device or the vial containing the head space. One exemplary head space sampling device includes a conduit for receiving a pressurization gas, flow and pressure sensors for measuring gas flow and pressure within the conduit, a ventilation valve, a pressure valve for controlling gas flow through the conduit, and a controller for processing and controlling pressure and flow through the conduit.

Abstract: A system and method for detecting leakage of a refrigerant and chemicals in an air conditioning and heating system. In some cases, a refrigerant may be inadvertently heated via a heating unit to produces dangerous chemicals. A detector can be installed near an air ventilator and can be utilized for detecting the leakage of refrigerant and chemicals that are dispersed in air by a ventilating system.

Abstract: The present invention describes a system and method for accurately measuring the concentration of a substance within a filter housing. A concentration sensor and a communications device are coupled so as to be able to measure and transmit the concentration of a particular substance within the filter housing while in use. This system can comprise a single component, integrating both the communication device and the concentration sensor. Alternatively, the system can comprise separate sensor and transmitter components, in communication with one another. In yet another embodiment, a storage element can be added to the system, thereby allowing the device to store a set of concentration values. The use of this device is beneficial to many applications. For example, the ability to read concentration values in situ allows integrity tests to be performed without additional equipment.

Abstract: A method of measuring the gas flow of an incondensable gas in a flowing mixture of said incondensable gas and a condensable gas comprising the steps of calibrating a leak detector; injecting a known quantity of gauge gas at a known mass flow rate into said flowing mixture of gases; drawing a sample of the said gauge mix off at a sample point; passing said sample through a condenser so as to remove said condensable gas from the gauge mix, resulting in a test mix; passing the said test mix into the leak detector so as to measure the concentration of the gauge gas within the test mix; and calculating the mass flow rate of said incondensable gas within said flowing mixture. There is also provided a method of measuring the rate of ingress of an incondensable gas at an ingress point along a flow path of a flowing mixture of said incondensable gas and a condensable gas.

Abstract: The present invention describes a system and method for accurately measuring the concentration of a substance within a filter housing. A concentration sensor and a communications device are coupled so as to be able to measure and transmit the concentration of a particular substance within the filter housing while in use. This system can comprise a single component, integrating both the communication device and the concentration sensor. Alternatively, the system can comprise separate sensor and transmitter components, in communication with one another. In yet another embodiment, a storage element can be added to the system, thereby allowing the device to store a set of concentration values. The use of this device is beneficial to many applications. For example, the ability to read concentration values in situ allows integrity tests to be performed without additional equipment.

Abstract: A method of testing for leaks in a contained system with an interior containing system gas and system liquid at an operating pressure, the method comprising: pressurizing the interior of the contained system, by introduction of gas comprising tracer gas into the interior, to at least 0.5 pounds per square inch above the operating pressure to disperse the tracer gas throughout the system liquid; and sensing for the presence of the tracer gas using one or more sensors located outside the contained system.

Abstract: A leak detector comprising a base appliance provided with a gas detector, a vacuum pump, and a control device. A sniffer probe is connected to the base appliance. A test leak device containing the supply of test gas is arranged in a separate sub-housing. The sub-housing also contains a temperature sensor, a processor, and a data memory. The processor corrects the measured temperature according to a sample, and modulates the light of a light barrier. The processor is connected to the control device in the base appliance by a data cable.

Abstract: Micro-leaks are detected by means of a sniffer device including, in an original manner, a flat suction capsule (11) with divergent channels where the flow is regular, a resonant optical cavity (15) as a means of detection and a pump (16) with a low flow rate, which is insufficient to create a vacuum which would be required with other means of detection. Much fainter micro-leaks can be detected.

Abstract: In a method for checking the permeability rate of a closed container (3) with respect to a medium, in particular for checking the permeability rate of a film-type container for accommodating a film container for accommodating a pharmaceutical active constituent formulation, the container (3) is filled with a medium, charged with a gas, and the increase in the amount of medium in the gas is then analysed.

Abstract: The present invention describes a system for accurately measuring the concentration of a substance within a filter housing. A concentration sensor and a communications device are coupled so as to measure and transmit the concentration of a particular substance within the filter housing while in use. This system allows the operator to certify the integrity of the filters within the filter housing at the customer site without additional equipment. In one embodiment, a tracer gas, such as helium or hydrogen, is added to a carrier and injected into the system. The concentration of tracer gas at a specific operating transmembrane pressure is indicative of bubble pointing specific pores in the filter. This test will give a more sensitive indication of the bubble point and the presence of defects than a standard diffusion test. In a second embodiment, two gasses, in a known ratio, are introduced into the filter housing.

Abstract: A method for detecting leak from a fuel vapor treating apparatus defining a first area including a fuel tank and a second area including an adsorbent canister has hermetically closing the fist area, measuring internal pressure of the first area comparing an absolute value of differential pressure between the internal pressure of the first area and the atmospheric pressure with a predetermined value, measuring the internal pressure of the first area in a case that the absolute value is equal to or higher than the predetermined value in order to check for leaks from the first area based on changes in the internal pressure of the first area, fluidly communicating the first area with the second area in order to equilibrate internal pressures of the first area and the second area, hermetically closing the second area, and measuring the internal pressure of the second area in order to check for leaks from the second area based on changes in the internal pressure of the second area.

Abstract: A supersonic tracer gas impingement through-wall leak detection system can detect leaks through a barrier without the need for temporary enclosures or interior pressurization. The leak detection system includes a wand that can flow a mixture of compressed gas, such as air, and a tracer gas through a nozzle. The nozzle may be held close to a barrier to be tested and the pressure supplied against the barrier may be adjusted to achieve the desired exit velocity and resulting stagnation pressure on the surface of the tested barrier. A tracer gas detector or soap solution for visual indication of bubbling can be disposed on the other side of the barrier to detect the presence or absence of the tracer gas.

Abstract: A vane pump includes a housing defining a pump chamber; a rotor rotatably arranged in the pump chamber; and a motor to rotate the rotor. An imaginary plane is defined to bisect the pump chamber in an axis direction. The housing has a first inlet port and a second inlet port located symmetrical with each other with respect to the imaginary plane, and the housing has a first outlet port and a second outlet port located symmetrical with each other with respect to the imaginary plane.

Abstract: Disclosed is a method for detecting a leak gas in a flushing device (10), comprising the following steps: the flushing device (10) is disposed on a part (201) that is to be tested; a flushing gas is conducted through the flushing device (10); and the leak gas is detected in the flushing gas that is discharged from the flushing device (10) with the aid of a detector device (30). In order to conduct the flushing gas through the flushing device (10), a predetermined main flushing gas flow (QH) is generated, and said main flow (QH) is separated into a system flow (QS) and a partial flow (QT) on a dividing device (40), the system flow (QS) being fed into the flushing device (10). Also disclosed is a leak testing apparatus (100) for detecting a leak gas in a flushing device (10).

Abstract: Disclosed are a method of detecting a leak of fluoroolefin compositions and sensors used therefor. In particular, the method is particularly useful for detecting a leak of a fluoroolefin refrigerant composition from a cooling system of an automotive vehicle. Such fluoroolefin refrigerant compositions have double bond structures which make them particularly well suited with sensing technologies, including: infrared sensors, UV sensors, NIR sensors, ion mobility or plasma chromatographs, gas chromatography, refractometry, mass spectroscopy, high temperature thick film sensors, thin film field effect sensors, pellistor sensors, Taguchi sensors and quartz microbalance sensors.

Abstract: Methods and apparatus are provided for performing accurate, repeatable leak test measurements in wet, dusty and/or fluid-filled systems, such as a power plant, with no special sampling pumps, carrier gases or separators required. A leak detector probe is installed directly in a pipe or other component carrying a gas flow to be tested and is coupled to the inlet of a leak detector. The leak detector probe includes a test gas permeable membrane, which is positioned in the gas flow to be tested. The test gas permeable membrane may, for example, be positioned in a central region of a pipe in the flow of gas toward the evacuation pump. In some embodiments, the position of the leak detector probe in the pipe or other component may be adjustable.

Abstract: This invention provides a method for detecting contamination of a boiler condensate and/or a boiler feedwater in industrial fermentation processes. The method includes measuring an oxidation-reduction potential at one or more locations in the fermentation process with one or more devices capable of measuring oxidation-reduction potential at operating temperature and pressure. If the measured oxidation-reduction potential is not within an optimum range, an alarm is triggered.

Abstract: An automotive leak detector having a container of pressurized gas with an ultraviolet dye dispersed therein, flexible tubing, a regulator, and a pressure gauge. The container has an outlet to which the first end of the tubing is connected. The tubing also has a second end, with the second end having an outlet port. The regulator regulates the pressure of the gas and is attached to the tubing intermediate the first end of the tubing and the second end of the tubing. The pressure gauge is attached to the tubing intermediate the regulator and the second end of the tubing. The outlet port is dimensioned to facilitate attachment to the vapor recovery system access port of an automotive vehicle. Preferably the gas is a vapor made visible by shining an ultraviolet light thereon. Preferably the pressure gauge has a range of 0.1-20 pounds per square inch. Preferably the regulator maintains the pressure at the outlet of the tubing at approximately 1.5 pounds per square inch.

Abstract: A refrigerant leak detection system is provided for a motor vehicle, in which the system includes a heating, ventilating, and air conditioning (HVAC) module having a refrigerant sensor assembly adapted to be fixed within the drain hole of the sump. The refrigerant sensor assembly includes an elongated sensor element extending into the sump, a flange portion having apertures that allows the condensate to drain from sump, a collar portion with self-tapping threads.

Abstract: Disclosed are a method of determining the components of a fluoroolefin composition, a method of recharging a fluid system in which the composition is used, and sensors used therefor. In particular, the composition may be a fluoroolefin refrigerant composition used within a vapor compression system, where the refrigerant composition is useful in cooling systems as replacements for existing refrigerants with higher global warming potential. Such fluoroolefin refrigerant compositions have double bond structures which make them particularly well suited with sensing technologies, including: infrared sensors, UV/vis sensors, NIR sensors, ion mobility or plasma chromatographs, gas chromatography, refractometry, mass spectroscopy, high temperature thick film sensors, thin film field effect sensors, pellistor sensors, Taguchi sensors and quartz microbalance sensors.

Abstract: A method for optimizing direct wafer bond line width for reduction of parasitic capacitance in a MEMS device by reducing the width of a bond line between a first and a second wafer, exposing the MEMS device to a water vapor for a predetermined time period and at a first temperature capable of evaporating water, cooling the MEMS device at a second temperature capable of freezing the water, and operating the MEMS device at a third temperature capable of freezing the water to determine if there is discontinuity during operation.

Abstract: A device indicates the location of an air leak in a vacuum bag used to process composite parts. The device includes a layer of material on the inner face of the bag that changes in appearance due to an oxidation-reduction reaction in areas of the layer exposed to oxygen caused by a leak in the bag.

Abstract: The invention relates to a method for determining a suppression factor of a suppression system. The suppression system is arranged to suppress migration of a contaminant gas out of a first system. The suppression factor is an indication of the performance of the suppression system. The method includes introducing a tracer gas in the sub-system, providing a detection system configured to detect the amount of tracer gas that has migrated out of the first system, determining a first suppression factor for the suppression system for the tracer gas. The method further includes determining a second suppression factor for the suppression system for the contaminant gas based on the first suppression factor.

Abstract: A leak detector comprises a cell provided with a tracer gas inlet preferably permeable to a tracer gas. In the cell, the tracer gas is caused to assume an energetically higher metastable state. By means of laser spectroscopy the absorption spectrum of the metastable tracer gas is sampled in an optical measuring section, whereby the presence of tracer gas is detected.

Abstract: The leak detection device comprises a plurality of measuring cells (10) in whose interior the absorption of a laser beam (17) is influenced by the presence of tracer gas. All of said measuring cells (10) are connected to a host unit (25) via light-conducting fibers (28,34). In the host unit (25), a laser (26) designed for modulation and a photodetector (37) are arranged. Modulation of the laser radiation is preferably performed by two-tone frequency modulation. This has the effect that the fiber length cannot significantly skew the result of the measurement.

Abstract: For leak testing, a tracer gas is advanced to the outer wall (11) of the hollow test object (10) while the test object (10) is in an evacuated state. The tracer gas is discharged from a blower device (14) in the form of soap bubbles (21). When contacting the outer wall (11), the soap bubbles will burst, thus forming a cloud (27) of tracer gas immediately on the outer wall (11). By the invention, it is made easier to localize the invisible tracer gas in the ambient air. Further, the tracer gas can be used more effectively so that the costs for performing the testing process are reduced.

Abstract: The invention relates to a method for detecting leaks in an underground liquid pipe (T), particularly a water pipe, into which a gas is fed through a diffuser (8) into the liquid of the pipe, the atmospheric content of the gas being low; and the path of the pipe is traced along the pipe surface with a detection system for measuring at consecutive points the content of the air in the injected gas, an abnormally high content constituting a leak indicator. A diffuser (8) is selected having outlet pores for the gas, the mean diameter of which is less than 50 ?m so as to produce gas bubbles, the diameter of which is small.

Abstract: A cradle assembly for a pressure decay leak tester is provided. The assembly operatively receives a printhead integrated circuit carrier having a plurality of printing fluid paths defined therein, respective fluid inlets in fluid communication with respective fluid paths and a locating formation to facilitate correct location of the carrier on the tester. The assembly includes at least one complementary locating formation for engaging the locating formation of the carrier, and at least one fluid outlet for charging the carrier with fluid via a respective fluid inlet of the carrier. Also included is a clamping device for clamping the carrier to the fluid outlet, so that the integrity of the fluid paths is observable via pressure decay testing, and a control system operatively connected to the clamping device for controlling operation of the clamping device.

Abstract: An overall leakage rate of a vacuum system which can be operated continuously or cyclically is determined. The vacuum system includes at least one process chamber (10) and a pumping device (16) connected to the process chamber (10). In a cyclical leakage rate determination technique, the following steps are taken: suppressing a process gas feed to the process chamber (10), feeding a carrier gas to the process chamber (10), conveying the carrier gas and a leakage gas using the pumping device (16), measuring an amount of a gas component in the pumped gas, and determining the overall leakage rate of the vacuum system based on the measured amount of the gas component.

Abstract: A method for leak testing a vessel is described. The method includes providing an environment within the vessel that is at a lower humidity than the environment surrounding the vessel, and using a thermographic imaging system to identify any leaks associated with the vessel. The leaks are identified based on evaporative cooling that occurs when a portion of the lower humidity environment escapes from the vessel and mixes with the higher humidity environment surrounding the vessel.

Abstract: A pneumatic assembly for a pressure decay tester of printhead integrated circuits includes a pressurized air supply. A pneumatic clamping arrangement is in fluid communication with the pressurized air supply for clamping a carrier for the printhead integrated circuits such that the carrier is in fluid communication with the printhead integrated circuits. A valve arrangement applies a predetermined pressure to the carrier. A sensing arrangement senses a static pressure in the carrier. A control system is in communication with the clamping, valve and sensing arrangements to control operation thereof and to generate a discernible signal representing said static pressure such that a decay in said static pressure can be determined.

Abstract: A method of detecting a leak in a curing bladder during a tire curing process provides a curing bladder (40) and tire (42) in a tire mold structure (18). An inert tracer gas (48) is added to a pressurized gas such as nitrogen, with the nitrogen inflating the curing bladder so that the curing bladder engages a portion of the tire. The method detects whether the inert gas is present between the curing bladder and the tire while the curing bladder and tire remain in the tire mold structure. A curing bladder leak detection system (10) for a tire curing press (12) is also provided.

Abstract: The disclosed portable apparatus for determining leaks in air ducts includes a wheeled cabinet having hand-graspable handles for transport. A front, covered equipment readout includes displays for air duct flow, air duct pressure, blower speed, and smoke generator operation. An on-board variable speed blower control knob also is included on the front panel. Housed within the cart is a variable speed blower, a silencer, a smoke generator, power supply, and multiple venturis of different diameter for different sized air ducts to be tested.

Abstract: A method and apparatus for leak testing of liquid and non-liquid filled rigid and semi-rigid nonporous containers wherein a container is enclosed in a conforming test chamber and subjected to vacuum while the pressure within the chamber is monitored by an absolute pressure transducer, alone or in combination with a second differential transducer, to determine if leaks are present in the container and wherein the test apparatus or system remains under low pressure or vacuum conditions while leak tests are not actively in progress such that the system is maintained at an at-rest low vacuum condition to minimize pressure sensor drift and to eliminate build-up of vapors or gases within the apparatus or test system between tests that may hinder the speed and sensitivity of the leak tests.

Abstract: A sniffer leak detector comprising a detector with a quartz window, the window being selectively permeable to a tracer gas. The quartz window is located in a suction chamber that is connected to a vacuum pump. To reduce the response time, a gas guidance plate is situated in the suction chamber, the guidance plate and quartz window together delimiting a narrow gas guidance chamber.

Abstract: The gas sensor has a selectively permeable membrane which is composed of silicon material and is provided with a heating device on the outside. The membrane closes an evacuated housing which contains a pressure sensor. When evacuating the area surrounding the housing, the heat dissipation is changed as a result of the quick change in the total pressure of the surrounding air, with the result that signal drift arises despite temperature regulation of the membrane. The disclosure provides at least one second heating device whose temperature is regulated independently of the first heating device. As a result, the membrane temperature is highly constant even in the case of severely changing total pressure in the housing.

Abstract: A method and device for determining the hydraulic leakage rate of liquid-conveying parts, in particular injection valves for internal combustion engines, place the liquid-conveying part into a test body, and the liquid-conveying part is charged with a test liquid under a particular pressure, and a carrier gas stream is provided in a flow duct of the test body, and a vapor mixture behind the liquid-conveying part is conducted to an analyzer, and a measurement and analysis are carried out, using the analyzer, of the hydraulic leakage rate of the liquid-conveying part via the concentration of test liquid in the vapor mixture, the carrier gas stream being brought in via a nozzle element close to the leakage point of the liquid-conveying part, and/or a heating of the vapor mixture being provided behind the liquid-conveying part for complete conversion into the gas phase.

Abstract: A vane pump has an upper casing, a lower casing, a rotor and a motor. First to fourth points are defined on an outer peripheral end of a lower flat surface of the lower casing. The first point is farthest from an intersection between an axis of a shaft of the motor and the lower flat surface. A suction passage passing through the third point and a discharge passage passing through the second point are formed between the upper casing and the lower casing. The fourth point is defined in a range from the third point to the first point. The lower flat surface is provided to incline with respect to the axis of the shaft of the motor such that the fourth point is farthest from a motor case of the motor among points on the outer peripheral end.

Abstract: A tool for assisting the leak testing of an enclosed volume is disclosed. The tool may comprise an outer seal defining inside its perimeter an attachment face of the tool. A vacuum port defined in the attachment face is configured to be fluidly coupled to a vacuum source. A nozzle disposed in the attachment face may be coupled to the test port, in fluid communication with the enclosed volume. A primary connection in fluid connection with the nozzle may be placed in fluid connection with the external conduit. A nozzle seal is disposed in the attachment face around the perimeter of the nozzle, such that when the nozzle is coupled to the test port, the nozzle is fluidly isolated from said vacuum port. A leak-test system incorporating at least one tool and a method for leak testing an enclosed volume using the tool are disclosed.

Abstract: A process is described for producing a clean gas, which is provided, in particular, for testing a pressurized construction component (100) for leaks, which process includes the steps of providing a liquefied gas mixture (1) which contains the clean gas (2) and at least one foreign gas (3) in a gas separation unit (20), enriching the clean gas (2), wherein the at least one foreign gas (3) is transferred to a surface region of the liquefied gas mixture (1), and taking off the enriched clean gas (2), wherein the enriched clean gas (2) flows out of a volume region of the gas separation unit (20) via a guide unit (22), and wherein a foreign gas barrier (23) is formed at the guide unit (22), using which the foreign gas (3) in the liquefied gas mixture (1) is passed out from an opening in the guide unit (22). A device for producing a clean gas, a noble-gas-free gas composition and a process for testing a construction component pressurized with a test gas for leaks are also described.