A leak detection system comprising a substantially sealed accumulation chamber adapted to accommodate a single gas container, the accumulation chamber being sealed so that when a gas container is in the accumulation chamber gas leaked from that container accumulates. An optical detector is provided for detecting leaked gas, the detector including an optical cell. A controller directs a reference sample to the optical cell and subsequently directs a sample from the from the accumulation chamber to the optical cell. The optical detector is operable use both the reference sample and the accumulation chamber sample to detect leaked gas.

A gas detection apparatus for cell module assemblies accurately and rapidly detects a damaged cell of a cell module assembly and the damaged position of the damaged cell. The gas detection apparatus includes a gas detection chamber configured to receive a cell module assembly; and a sliding die configured to be movable to the lower part of the gas detection chamber in the state in which the cell module assembly is disposed at the upper end thereof. The gas detection apparatus further includes a gas sensor provided in the gas detection chamber, the gas sensor including a plurality of gas sensors disposed so as to correspond to positions of cells of the cell module assembly. A gas detection method for cell module assemblies uses the gas detection apparatus for cell module assemblies.

The present invention provides a method for leak testing by which occurrence of fine leakage from a work as a test object can be determined without being affected by a released tracer gas that is also released from a non-defective work. The method for leak testing includes a series of steps including a gas bombing step wherein a work W as a test object is soaked in a pressurized tracer gas, a work setting step wherein the work subjected to the gas bombing is set in a hermetically sealed container 10, a vacuum suctioning step wherein the hermetically sealed container 10 is vacuum suctioned by a suction device 20 and a measuring step wherein tracer gas measurement data are obtained by measuring a vacuum suctioned tracer gas with a detector 30. Tracer gas measurement data for a non-defective work are preliminarily obtained by performing the series of steps for the non-defective work having same specifications as the work W as the test object. The tracer gas measurement data for the work W as the test object are compared with the tracer gas measurement data for the non-defective work in the measuring step, and thereby, occurrence of fine leakage from the work as the test object is determined.

A method for ascertaining the presence of cracks in sealed containers includes steps of defining a detection zone (13) in which a sealed container (CT) will be placed, placing a container (CT) in the detection zone (13), ascertaining the presence of a thermal gradient determined by the container in the detection zone (13), the thermal gradient being indicative of the presence of a crack in the container (CT).

The invention relates to a device for vacuum leak detection, comprising a vacuum pump (18), a test chamber (12) which is designed to accommodate the test specimen and can be evacuated by means of the vacuum pump (18), and a gas detector (16) which detects the gas evacuated from the test chamber (12) by means of the vacuum pump (18), wherein the test chamber (12) has a plurality of vacuum connections (26) provided with the vacuum pump (18) in order to evacuate the test chamber (12), characterized in that a common pump volume (28) which is connected to the vacuum connections (26) is fluidically provided between the vacuum connections (26) and the vacuum pump (18) and is evacuated by means of the vacuum pump (18).

To provide a leakage detector that can improve energy efficiency by making it possible to suppress an increase in the number of man hours required in a process of producing a fuel cell stack. A leakage detector 1, 61 includes: a presser 15 configured to press cells of a fuel cell FC, the cells being laminated together and being housed in a fuel cell case C that has a first end that is closed and a second end that is not being closed by a lid; a feeder 61 configured to feed gas to the fuel cell case C while the presser 15 presses the cells of a fuel cell FC at a pressure equal to or higher than a predetermined pressure; and a detector 61 configured to detect leakage of the gas from the fuel cell case C to which the gas is being fed by the feeder 61.

The invention relates to a test chamber and to a method for operating a test chamber for conditioning air, in particular a temperature control chamber, a climate chamber or the like, the test chamber comprising a temperature-insulated test space, which can be sealed from an environment and serves to hold test material, and a temperature control device for controlling the temperature of the test space, the temperature control device being configured to establish a temperature in a temperature range of 50 C. to +180 C. within the test space, the temperature control device having a heating feature and a cooling feature with a cooling circuit with a refrigerant, a heat exchanger in the test space, a compressor, a condenser and an expansion member, the refrigerant being a hydrocarbon or a refrigerant mixture of hydrocarbons, the test chamber being provided with a machine room physically separated from the test space, the cooling circuit with the compressor being at least partially disposed in the machine room. The test chamber comprises a ventilation system having a detector with at least one gas sensor for detecting refrigerant in the test space, the ventilation system comprising a fan and an exhaust duct, the exhaust duct being connected to the test space in such a manner that the fan can transport air from the test space into the exhaust duct, the fan comprising a fan motor and a fan impeller, the fan motor being disposed in an air-tight enclosure, or the exhaust duct being connected to the test space and the machine room in such a manner that the one fan can transport air from the machine room and the test space into the exhaust duct.

A fitting assembly includes a fitting comprising a housing and a connector assembly arranged within the housing. The connector assembly comprising a hollow interior and configured to be movable between an unactuated position and an actuated position. In the actuated position, the connector assembly is connectable to a pipe receivable within the hollow interior. An adapter coupled to the fitting includes a biasing mechanism configured to bias the connector assembly from the actuated position to the unactuated position.

An object of the present invention is to provide a chamber in which workpieces of different sizes can be positioned. A chamber according to an aspect of the present invention is a chamber for a leak tester, the chamber housing in the interior thereof a workpiece having an opening, the chamber including: a first member having a recess that forms a housing space for the workpiece; a second member adapted to close an open end of the recess; and a positioning mechanism for positioning the workpiece within the housing space such that the opening is in a predetermined position, wherein the positioning mechanism holds the workpiece apart from the first member and the second member.