DEVICE FOR MONITORING TECHNICAL STATE OF ELECTRIC CENTRIFUGAL PUMPING PLANT Russian patent published in 1999 - IPC

FIELD: diagnosis of subsurface sucker-rod pumps and measuring level of liquid in wells. SUBSTANCE: device includes primary converter with piezoelectric ceramic sensor and secondary recording device made in form of circuit induction suppressor, low-pass filter, adjustable amplifier and recording unit connected in series. Tape-movement mechanism is connected to second input of unit; time calibrator is connected additionally to amplifier input. Connected in series to sensor output in primary converter are: symmetrizing unit, signal limiter, preamplifier and voltage follower. Switching unit is additionally connected to input of circuit induction suppressor in secondary recording device. Adjustable amplifier is made with fixed positions of gain factor whose magnitudes are selected in the following rations: 1:1, 1:2, 1: 4, 1: 8, 1: 16, 1:32, 1:64 and 1:128. EFFECT: possibility of recording and measuring level of vibrations in annulus space of wells which depends on mode of operation of pumping unit. 1 dwg