PRESSURE TESTING DEVICE Russian patent published in 1999 - IPC

FIELD: measurement technology. SUBSTANCE: invention can be used to test pressure ( excessive, absolute, expansion, pressure differential ) of neutral and corrosive media. Proposed device includes measurement generator in which measurement tuning fork quartz vibrator is driven, reference generator in which reference tuning fork quartz vibrator is driven. Both vibrators are located in sealed bellows filled with inert gas. Device also has units multiplying frequencies of measurement and reference generators by n times, circuit isolating difference frequency made in the form of CD flip-flop and indicator of difference frequency made in the form of frequency-to-voltage converter with analog indicator which numbered scale carries segments corresponding to critical values of pressure. Such design of device provides for graphical visual indication of measured pressure with keeping of good operational characteristics. EFFECT: graphical visual indication of measured pressure with keeping of good operational characteristics. 1 dwg