Inficon Gmbh

Leybold Aktiengesellschaft

Oerlikon Leybold Vacuum Gmbh

Unakis Balzers Ag

Norbert Rolff

Daniel Wetzig

Randolf Paul Rolff

Silvio Decker

Werner Grosse Bley

Hjalmar Bruhns

Sandra Seitz

Ralf Kilian

Jörn Liebich

Norbert Moser

Rudolf Stocker

Thomas Böhm

Ludolf Gerdau

Stefan Mebus

Michael Dauenhauer

Jochen Puchalla-König

Heike Hilgers

Ernst Franke

Martin Bohn

Jochen Puchalla

Thomas Boehm

Jochen Puchalla-könig

Randolf Rolff

The disclosure provides a gas detector with an ionizing device for producing ions depending on a gas to be detected. The gas detector includes a catcher for receiving the electrical current produced by the ions, and a measuring device with an electrical measuring resistor. The electrical measuring resistor produces an electrical measuring potential from the current and is surrounded, at least in part, by an electrical shield resistor, denoted by R. The same potentials, up to a deviation of at most 25%, are applied in the longitudinal direction of the electrical measuring resistor to mutually opposed regions of the electrical measuring resistor and the electrical shield resistor.

Gas detector with an ionizing device

A method for testing a test specimen for the presence of a leak using a film chamber for accommodating the test specimen, wherein the film chamber comprises walls enclosing a film chamber volume, which walls include at least one flexible wall area, comprising the steps of:

Method for leak testing using a film chamber with ventilated measuring volume

Method for testing a test piece for the presence of a leak using a foil chamber, wherein the foil chamber has walls having at least one flexible wall region to which a measurement volume adjoins and is arranged on that side of the flexible wall region opposite the foil chamber volume and is hermetically separated from the foil chamber volume, having the following steps: placing the test piece in the foil chamber, closing the foil chamber, evacuating the foil chamber and monitoring the measurement volume during evacuation of the foil chamber, using the result of the monitoring to reach a conclusion regarding the magnitude of a leak, characterized in that a venting valve connecting the measurement volume to the atmosphere is closed when the pressure in the measurement volume is below a predefined threshold value, and is opened as soon as the pressure exceeds the threshold value.

Method for leak testing with a foil chamber with vented measurement volume

The invention relates to a method for the gross leak measurement of an at least partially incompressible test object () in a film chamber () that comprises at least one flexible wall region and is connected, in a gas-conducting manner, to a pressure sensor (), a vacuum pump () and, by way of a calibration valve (), to a calibration chamber () enclosing a calibration volume (), comprising the steps of evacuating the film chamber (), measuring the pressure curve within the film chamber () after the evacuation is completed, connecting, in a gas-conducting manner, the calibration volume () to the inner volume of the film chamber () during the measurement of the pressure curve, the pressure being measured before the gas-conducting connection is established, and with the gas-conducting connection established, to the film chamber (), and the pressure in the calibration chamber () prior to the connection to the film chamber () being higher or lower than the pressure in the film chamber (), characterized in that the pressure difference &#x394;pbetween the pressure before the gas-conducting connection is established and the pressure with a gas-conducting connection to the film chamber (), in the case of an empty film chamber () comprising no test object (), is compared to the corresponding pressure difference &#x394;pwhen a test object () is present in the film chamber ().

Gross leak measurement in an incompressible test item in a film chamber

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.

Gas leak search using a test gas spray device

A film chamber for receiving a test object which is to be tested with respect to the presence of a leak, wherein the film chamber has walls enclosing a film chamber volume, said walls having at least one flexible wall region, wherein a measuring volume adjoining the flexible wall region is arranged on the side of the flexible wall region which is situated opposite the film chamber volume and is hermetically separated from the film chamber volume.

Film chamber with measuring volume for gross leak detection

A sniffer leak detector includes a mass spectrometer for analyzing hydrogen or helium, a turbomolecular pump which is connected with said mass spectrometer and whose outlet is connected with a prevacuum pump, and a sniffer probe which includes a plurality of intake lines and is connected with said inlet of said turbomolecular pump, wherein a vacuum pump includes at least three stages whose inlet stage defines said prevacuum pump and is connected with said outlet of said turbomolecular pump via a blocked throttle, wherein, between adjacent stages of said vacuum pump, an intermediate inlet each is provided, wherein each intermediate inlet is connected with a different intake line of said sniffer probe and at least one of the intake lines as a suction line is connected with said inlet of said turbomolecular pump for obtaining different gas flows.

Sniffer leak detector with multi-stage membrane pump

A simplified device for voltage supply of the cathode of a mass spectrometer comprises a push-pull transformer, wherein, apart from the normal rectifier diodes (), a controlled rectifier () is provided. The gate of the first transistor () is connected to the second output (), and the gate of the second transistor () is connected to the first output () of the transformer. A voltage supply device, consisting of at least one voltage multiplier, is connected via capacitors () to the output of the transformer and feeds, amongst others, the emission current measurement device.

Device for supplying voltage to the cathode of a mass spectrometer

A fast method for determining molecular mass using mass spectrometry has the following steps: specifying a first adjusting value (M1) of the mass spectrometer, recording the associated signal amplitude (A1), specifying a second adjusting value (M2) which is different to the first, measuring the associated second signal amplitude (A2), specifying a third adjusting value (M3) which is different to the first (M1) and the second (M2) adjusting value, measuring the associated third signal amplitude (A3), determining a quadratic function containing the measured amplitude values as y-values and the specified adjusting values as x-values, determining the maximum of the quadratic function, wherein the searched adjusting value is determined from the x-value of the maximum.

Method for determining the maximum mass peak in mass spectrometry

A leak detection method using a specimen filled with a test gas positioned in front of a suction opening. Air is suctioned along the entire surface of the specimen and takes up test gas in the case of a leak. The test gas is recognized by a test gas detector. According to the invention, full mobility of the specimen is ensured during the testing process so that the leak detection method can be carried out while the specimens are moving past the suction opening.

Leak detection method

A sniffing leak detector which comprises a first suction line in a sniffing probe, the line leading to a main device, is provided with a larger second suction line through which gas is sucked in from the sniffing tip by a gas delivery pump. By connecting the second suction line, the distance sensitivity is increased. By disconnecting the second suction line, on the other hand, the sensitivity is increased. Thus, it is possible to first search for leaks by use of a high gas throughput and subsequently exactly determine the leaks under the quantitative aspect by use of a reduced flow.

Sniffing leak detector

An illumination device is provided at the handle-piece of a sniffing probe, in which the illumination device illuminates the region to be inspected. This incorporation considerably facilitates handling of the sniffing probe in difficult-to-access and poorly illuminated regions, for sniffing probes used for detecting gases, for example, for detecting a gas leakage in a cooling device of a motor vehicle.

Sniffing probe

Usually, a sniffing leak detector must be calibrated for each tracing gas. The calibration comprises ranging of the spectral positions into the mass spectrum and the amplitude height. At least one mass line is determined with a calibrating gas. The mass lines lying between two mass lines and/or between a zero point and a line are determined by interpolation and/or extrapolation. In this manner, a sniffing leak detector can be used for such tracing gases which have not previously been used for calibration purposes.

Method for calibrating a mass spectrometric sniffing leak detector

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.

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.

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Horrem, Germany

Norbert Rolff