INDICATOR OF EQUAL PRESSURE OF TWO MEDIA Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: indicator has flat flexible diaphragm 1 placed between base surfaces of two parts 2 and 3 of split housing. Base surface of part 2 is flat and that of part 3 is concave. Electric contact member 6 is made in the form of flexible resilient rod provided with screw 7 and passed through central hole in flat base surface for interaction with diaphragm. Screw 7 is free to move inside cylindrical bushing 8 secured rigidly in part 2 by means of nut 9 and insulated electrically therefrom by spacers 10. Housing is hermetically sealed by plug containing capillary tube 11 with electric conductor 12 passed through. Capillary tube 11 is connected with input 13 for feeding indicator with counterpressure and for output of electrical circuit. Indicator is connected with medium to be tested via pipe union 14. Pressure of medium under test presses diaphragm against flat base surface and makes it close circuit with electric contact rod 6. Feed of counterpressure forces diaphragm from flat base surface and straightened contact rod thus breaking electric circuit. Then counterpressure is slowly reduced and its value is registered at the moment of repeated closure of electric circuit. EFFECT: improved accuracy. 2 cl, 1 dwg