DEVICE FOR VACUUM TESTING Russian patent published in 1995 - IPC

FIELD: testing equipment. SUBSTANCE: device is manufactured in the form of measurement chamber 1 placed into solenoid 2. Heat-sensitive element is fabricated in the form of flat pyroelectric converter 3, it and flat heater parallel to it are positioned in chamber. Thermal resistance of heater 4 forms arm of D. C. Whetstone bridge 5 which is pressure meter based on Pirani principle and is fed from source 6. D. C. amplifier 7 located together with pyroelectric converter in screening sleeve 8 is connected to pyroelectric converter so that form one structure - pyromodule. Source 10 of pulsating current can be linked to solenoid 2 by means of commutation device 9 and flow measuring selective amplifier 11 tuned to frequency of pulsating current of source 10 and flow measuring amplifier 12 of pulse signals can be connected in turn to D. C. amplifier 7. Pyroelectric converter 3 is heat-insulated from walls of chamber 1. Electric leads of elements of device can be made bifilar. EFFECT: expanded application field. 3 cl, 2 dwg