Abstract: A leak detector for detection of leaks from an object to be tested by detection of a tracer gas, the leak detector including: an inlet of gases; a pumping device; a pumping line connecting the inlet of the gases to the pumping device; a device for detection of tracer gas fitted to the pumping line, as bypass of the pumping device, the device for detection of tracer gas including a probe configured to ionize the gas molecules and to measure current of the ionized gas molecules, and a separating membrane arranged upstream of the probe. The separating membrane is a monoatomic layer of graphene deposited on a gas-permeable substrate of the device for detection of tracer gas including selection orifices, the greatest dimension of which is less than 5 angstroms, made in the monoatomic layer of graphene.

Abstract: A leak detector for detection of leaks from an object to be tested by detection of a tracer gas, the leak detector including: an inlet of gases; a pumping device; a pumping line connecting the inlet of the gases to the pumping device; a device for detection of tracer gas fitted to the pumping line, as bypass of the pumping device, the device for detection of tracer gas including a probe configured to ionize the gas molecules and to measure current of the ionized gas molecules, and a separating membrane arranged upstream of the probe. The separating membrane is a monoatomic layer of graphene deposited on a gas-permeable substrate of the device for detection of tracer gas including selection orifices, the greatest dimension of which is less than 5 angstroms, made in the monoatomic layer of graphene.

Abstract: The leak detection device using hydrogen as a tracer gas is intended to be connected to an object to be tested. The leak detection device includes a hydrogen sensor placed in a low-pressure enclosure and includes a diode, a resistor, a MOS-type transistor whose gate is covered with a palladium catalyst, a pump connected to the low-pressure enclosure, a pressure gauge configured to measure the pressure in a vacuum line formed by the low-pressure enclosure connected to the pump, and a multiway valve having a first port allowing admission of the gas flow containing the tracer gas into the vacuum line, and a second port allowing the admission of neutral gas. The method makes it possible to stabilize the pressure of the vacuum line in order to avoid fluctuations in the hydrogen measurements.

Abstract: The invention relates to a method for monitoring a leak detector comprising: a secondary vacuum pump designed to be connected to a primary vacuum pump, the secondary vacuum pump comprising a motor, a rotor and a stator, the said rotor being capable of being rotated in the stator by the motor when the motor is powered, and at least one information means capable of being powered electrically, in order to inform a user of the operating state of the leak detector, characterized in that, in the event of the motor power supply being cut off, the kinetic energy of rotation of the secondary vacuum pump rotor in the form of electrical power (101) is recovered in order to power the information means (102). The invention also relates to a leak detector (1) using the said monitoring method.

Abstract: The leak detection device using hydrogen as a tracer gas is intended to be connected to an object to be tested. The leak detection device includes a hydrogen sensor placed in a low-pressure enclosure and includes a diode, a resistor, a MOS-type transistor whose gate is covered with a palladium catalyst, a pump connected to the low-pressure enclosure, a pressure gauge configured to measure the pressure in a vacuum line formed by the low-pressure enclosure connected to the pump, and a multiway valve having a first port allowing admission of the gas flow containing the tracer gas into the vacuum line, and a second port allowing the admission of neutral gas. The method makes it possible to stabilize the pressure of the vacuum line in order to avoid fluctuations in the hydrogen measurements.

Abstract: The invention relates to a method for monitoring a leak detector comprising: a secondary vacuum pump designed to be connected to a primary vacuum pump, the secondary vacuum pump comprising a motor, a rotor and a stator, the said rotor being capable of being rotated in the stator by the motor when the motor is powered, and at least one information means capable of being powered electrically, in order to inform a user of the operating state of the leak detector, characterized in that, in the event of the motor power supply being cut off, the kinetic energy of rotation of the secondary vacuum pump rotor in the form of electrical power (101) is recovered in order to power the information means (102). The invention also relates to a leak detector (1) using the said monitoring method.

Abstract: In a system in accordance with the invention for detecting leaks, a mass spectrometer is connected to the aspiration side of a secondary pump whose discharge side is connected to the aspiration side of a primary pump driven by a rotational drive system adapted to vary the rotation speed of the primary pump between at least two different rotation speeds. An aspiration inlet is selectively connected by control valves either to the aspiration side of the primary pump or to the aspiration side or an intermediate area of the secondary pump. Variation of the rotation speed of the primary pump is used to perform faster pre-evacuation before the test, to detect grosser leaks, to compensate for a high level of outgassing or to adapt the sensitivity of the device, and equally to eliminate helium background noise from the primary pump.