Inficon Gmbh

Sandra Seitz

Werner Grosse Bley

Randolf Paul Rolff

Norbert Rolff

Daniel Wetzig

Rudi Widt

Thomas Böhm

Norbert Moser

Thomas Boehm

Randolf Rolff

A stack () of fuel cells () is to be tested for tightness of the fuel cell membranes. For this purpose, a tracer gas is introduced into the fuel feed channel () of the stack (). The fuel discharge channel () is either open or it is closed. A carrier gas is fed to the feed air channel. () and led through the exhaust air channel () to a gas sensor () where a determination is made whether the carrier gas contains amounts of tracer gas. A defective fuel cell () can be located by introducing a lance comprising a sniffing probe into the corresponding channel () and determining the position of the probe.

Method for checking the seal of a stack of fuel cells

The sniffing leak detector comprises a sniffing probe, a suction device and gas detector. An operator-activated switch initiates the beginning of a measuring operation. The switch starts a time measurement, wherein an alarm signal is generated by a signal transmitter at the end of a predetermined measuring period. The sniffing leak detector allows for an operator guidance from measuring point (MP) to measuring point, wherein the measuring period is predetermined and an adherence to the measuring period is monitored.

Sniffing leak detector

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.

Leak detector with a leak detector testing device

The leakage search assembly has a main device which contains a vacuum pump and a test gas sensor, and a hand-held sniffing probe. Capillary lines which connect the sniffing probe to the basic assembly contain valves by means of which these lines can be selectively opened. In a leakage search mode, the capillary line having the larger cross section is open. This results in leaks also being found from a greater distance. The dead time before response of the test gas sensor is shortened. Once a leak has been located, the assembly is switched to the leakage rate measurement mode, in which only the capillary line with the smaller cross section is open. This results in quantitative determination of the leakage rate with high accuracy and high stability.

Leakage search assembly having a sniffing probe

A leak test apparatus includes a housing having an interior sized for retaining a plurality of instrument components including a control unit. A sniffer gun is linked to the instrument components, the sniffer gun having an intake point, and a test leak includes a gas reservoir, a constriction, an opening suited for introducing the intake point of said sniffer gun, and a temperature sensor. The temperature sensor is linked, either by means of a wired connection or wirelessly to the control unit for signal transfer.

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Duesseldorf, Germany

Sandra Seitz