METER OF PRESSURE DIFFERENCE ( VARIANTS ) Russian patent published in 1999 - IPC

FIELD: instrumentation. SUBSTANCE: meter can be used in the capacity of differential pressure pickup in flowmeters mounted in various service lines. Meter of pressure difference has two chambers with separating membranes installed in them made in case and filled with nematic liquid crystal. Chambers are connected with the use of clear planar capillary having transparent current conductive layer deposited on internal surfaces of its walls. Optocoupler with radiation source and detector is positioned on both sides of capillary. Characteristic feature of meter lies in capillary having variable section. Capillary of variable section can have walls arranged at angle with regard to each other. It can be manufactured by installation of limiting gaskets of variable section. Another variant of meter of pressure difference has two chamber with separating membranes made in case and filled with nematic liquid crystal. Chambers are connected by clear planar capillary having transparent current conductive layer deposited on internal surfaces of its walls. Optocoupler with radiation source and detector is positioned on both sides of capillary. Current conductive layer is made in the form of separate insulated sections to feed voltage of different value to each of them. EFFECT: expanded range of adjustment of sensitivity and possibility of taking of visual readings. 4 cl, 4 dwg