UNIT FOR MEASURING PRESSURE Russian patent published in 1994 - IPC

FIELD: measuring instruments. SUBSTANCE: unit has pressure gauge having case, diaphragm provided with the first bridge circuit that includes resistance strain gauges 11-14 and two temperature-sensitive resistors 15,16 connected in opposite arm of the third bridge circuit. The unit also has power source, the first, second and third amplifiers 25,32,,28, adder 26, comparator unit 29, the first and second controller dividers 30,31, voltage controller 24, and recorder 27. The unit has additional diaphragm 6 provided with the second bridge circuit that includes resistance strain gauges 19-22. Opposite side of the diaphragm is formed with space 7 coupled with the atmosphere through passage 8 and insulated from fluid to be measured. EFFECT: enhanced accuracy. 3 dwg