METHOD FOR CREATION OF PRESSURE DIFFERENCE AND DEVICE FOR ITS REALISATION Russian patent published in 2009 - IPC G01L19/00 

FIELD: physics, control.

SUBSTANCE: invention is related to method for creation of gas mixture pressure drop, and also to device for its realisation, and may be used for instance to perform tests on detection of error in different facilities of pressure difference measurement, also for their check-up, graduation and calibration. Suggested method is realised in the following manner. Measurement reservoir V₁ is combined with both cavities of pressure difference measurement facility, measurement reservoir is filled up to initial pressure P₁, one of pressure measurement facility cavity is isolated from measurement reservoir, dosing reservoir is filled once to pressure P₂, permanent gas temperature is provided by balancing of initial temperature of working gas mixture in measurement and dosing V₂ reservoirs with ambient air temperature, dosing reservoir is once connected to measurement one, and pressure balancing is expected in measurement and dosing reservoir. Device for method realisation includes measurement V₁ and dosing V₂ reservoirs of calibrated volumes, valves and connecting pipelines, which connect these reservoirs to each other and to pumping system to pressure source, cavities of pressure difference measurement facility, and manometre for measurement of initial pressure in reservoirs, which differs by the fact that additional elements are introduced in it - valve and connecting pipeline for connection of pressure difference measurement facility to measurement reservoir, measurement and dosing reservoir and other mentioned elements of device included into combined volumes are made of materials with high heat conductivity, besides shapes and dimensions of mentioned elements are selected based on condition for provision of quite fast balancing of initial temperature of working gas mixture with ambient air temperature. In order to reduce effect of adsorption-desorption processes that might result in variation of initial pressure in cavity of pressure difference measurement facility, additional buffer reservoir may be connected to this cavity.

EFFECT: maximum simplification of pressure difference creation between two cavities of pressure difference facility and increase of its efficiency.

4 cl, 2 dwg