Disclosed is a device for testing airtightness of a fuel cell stack. The device for testing airtightness of a fuel cell stack including a first reaction gas inflow portion and a first reaction gas outflow portion which a first reaction gas flows in or out, respectively, and a second reaction gas inflow portion and a second reaction gas outflow portion which a second reaction gas flows in and out, respectively, includes i) a detection gas supplier supplying a detection gas to the first reaction gas inflow portion, ii) an intake installed to be movable in a sequential stacking direction of fuel cells in the second reaction gas outflow portion, iii) a detection gas concentration detector intaking a detection gas through the intake and detecting a concentration of the detection gas, and iv) a controller determining an airtightness-defective cell based on a position of the intake by analyzing the detected concentration value of the detection gas detected by the detection gas concentration detector.

Disclosed is a mass-spectrometry leak detector including a multi-stage turbomolecular pump, a mass spectrometer connected to the suction side of the turbomolecular pump, a preliminary vacuum pump connected to the pressure side of the turbomolecular pump, and a booster pump stage. The suction side of the booster pump stage has a connection for a test object and the pressure side is connected to the pressure side of the turbomolecular pump and to the suction side of the preliminary vacuum pump by means of a gas line path. The stages of the turbomolecular pump and the booster pump stage are arranged on a common shaft and have a common drive and the gas line path is interrupted, by means of a separation, between the pressure side of the booster pump stage and the suction side of the pump stage of the turbomolecular pump connected to the mass spectrometer.

The present invention relates to a mass spectrometer (10) for detecting leakages via a tracer gas, said spectrometer (10) comprising:an ionising means (3) intended to ionise said tracer gas;at least one magnetic-field source (501) that generates a magnetic field (I) that is dependent on the electric current I supplied to said source (501) and that is intended to sort ionised elements;a means (7) for detecting said tracer gas once ionised; characterized in that said spectrometer comprises a means (II) for adjusting the magnetic field, said adjusting means being configured to allow at least two separate adjustments, said adjustments having different sensitivities.

A gas injector apparatus and method for use with a tracer gas airflow measurement system that allows for large, continuous tracer gas flow rates while avoiding operation at very cold temperatures that will damage equipment. The controlled and variable heating of high pressure tracer gas flow before a gas regulator allows all points in the system to remain above freezing, and within a safe temperature range. The system has a tracer gas source and a heater that heats the gas isobarically at high pressure (>100 psi) and the hot gas is expanded across a pressure regulator to a lower working pressure to 30 psi. The gas flow is modulated using a mass flow controller with a high turndown ratio and injected into a bulk fluid flow with an injector.

A method for leak detection of a test specimen includes providing an evacuable film test chamber which is operatively coupled to a pressure measuring device, and at least one processor operatively coupled to the pressure measuring device; measuring a pressure within the evacuable film test chamber by the pressure measuring device at predetermined times during a measurement period of time; calculating by the processor, a first or higher order derivative of a pressure change with respect to time at a first predetermined time, and a first or higher order derivative of a pressure change with respect to time at least at a second predetermined time during the measurement period of time, to provide at least a pair of derivative values; and categorizing by the processor a leaky or tight state of the specimen under test by a pattern recognition process based on the pair of derivative values.

A headspace sampler includes: a sample gas collection channel whose one end communicates with a needle; a pressure gas introduction channel and an exhaust channel that communicate with the other end of the channel in parallel via a branching pipe; a pressure control device that delivers pressure gas to the pressure gas introduction channel at a predetermined pressure; solenoid valves provided in the pressure gas introduction channel and the exhaust channel, respectively; and switching means for switching a state where a measuring pipe is inserted in the sample gas collection channel and a state where the measuring pipe is shorted away from the channel, wherein a pressure sensor is provided on an upstream side of the solenoid valve in the exhaust channel.

The invention relates to a gas leakage search device including a test gas spray device for spraying a test object with a test gas, a vacuum assembly for evacuating the test object, wherein the vacuum assembly has a vacuum pump and a gas detector downstream of the test object for measuring the test gas proportion, and an analysis unit which evaluates the measurement signal of the gas detector. The invention is characterized in that a data communication connection is established between the spray device and the analysis unit; the spray device is designed to detect at least one point in time of the spraying process and to transmit same to the analysis unit, and the analysis unit is designed to output the corresponding measured test gas proportion at the transmitted point in time of the spraying process.

The invention is directed to improved systems, methods, and computer readable media for detecting gas leaks. More particularly, the invention detects gas leaks or discharges, such as methane or any other suitable gases, by analyzing reflected or direct light that passes through a region of enhanced target gas concentration. The invention collects light and processes spectral data of the light. All molecules are subject to rotational motions, vibrational motions, and/or combinations thereof (rovibrational motions), in which the atoms in the molecule are vibrating with respect to each other and/or rotating around each other. When the light passes through the region of the target gas, a portion of the light with certain wavelengths will be absorbed by the target gas due to the rovibrational motions of the target gas molecules. By analyzing the magnitude of absorption at certain wavelengths, one can determine the concentration of certain target gas or gases.

Systems, devices and methods including a handheld sensing device comprising: a sensor configured to measure ambient methane, ethane, propane, butane, and/or pentane concentrations; and a handle, where the sensor is disposed on a first end of the handle; control electronics comprising: a processor having addressable memory, the processor in communication with the sensor, where the processor is configured to: receive the measured ambient gas concentrations; and detect elevated ambient gas concentrations that may be attributed to a natural gas emissions source based on the measured ambient gas concentrations.

Methods for testing the integrity of a containment sump in contact with a matrix with a testing apparatus are provided. The testing apparatus may include an underground fixture positioned in contact the matrix, a test chamber, a conduit structure providing fluid communication between the underground fixture and the test chamber, and a pressure source for exerting a pressure that is communicated to the underground fixture via the conduit structure. In some embodiments, a method may include: releasing a test media into the containment sump; generating a negative pressure within the testing apparatus for a time period; and testing for the presence of test media within the testing apparatus. In other embodiments, a method may include: releasing a test media into the testing apparatus; generating a positive pressure within the testing apparatus for a time period; and testing for the presence of test media within the containment sump.