DEVICE FOR MEASURING PRESSURE Russian patent published in 1995 - IPC

FIELD: test equipment. SUBSTANCE: in order to provide the device with self-calibration function, the device has hollow thin-wall cylinder 1 which is placed into measuring chamber 7 and is driven into oscillation by means of electromagnet excitation system 2; vibrations of cylinder's wall are measured. Saturated vapors reference pressure source 4 is placed into thermostat 3 and connected to internal cavity of the cylinder and to input of additional chamber through special cock 5 Additional chamber has gas-proof shutter. Measuring chamber 7 has the cavity. The device is self-calibrated during operation by means of checking its graduating characteristic. For the purpose saturated vapors reference pressure source 4 is used; vapors of some pure matter are used as usual. The source is placed into thermostat 3 and has additional chamber 6 with gas-proof shutter. EFFECT: improved precision of measurement. 1 dwg