METHOD AND DEVICE FOR CONTROL OF GAS LEAKAGE Russian patent published in 2007 - IPC G01M3/00 

FIELD: measuring technique.

SUBSTANCE: method comprises displacing fluid from the tank with the calibrated cross-section, controlling the level of fluid in the tank by a contactless pickup whose output signals provides comprises two informative parameters (amplitude and frequency). The signals from the pickup are processed and the results are control and indicated (recorded) with a microprocessor device having an analogue-digital converter and frequency meter. The device also has a code-controlled gas volume controller, and two informative parameters from the pickup are processed simultaneously. The pickup has measuring vessel with pressure-tight lid. The dielectric plate with two flat inductive coils underlies the lid. The first coil is connected with the self-excited oscillator, and the second coil is connected with the input of the amplitude detector. The high-conducting nonmagnetic shield is mounted on the float parallel to the plane of the coils. The branch pipe with the three-way electromagnetic valve is set at the level of the liquid-gas interface. The gas from the object to be controlled is supplied to the vessel through the valve, or an excess of the fluid is drained through the valve when the vessel is filled. The bottom section of the vessel is provided with the second branch pipe with the three-way electromagnetic valve through which the vessel is filled with water or the liquid (water) displaced by gas is drained. The frequency at the outlet of the self-excited oscillator and amplitude at the outlet of the detector change by varying the space between the shield and coils. The amplitude signal is amplified by means of a scale amplifier.

EFFECT: enhanced precision and expanded functional capabilities.

6 cl, 5 dwg