CAPACITIVE LEVEL INDICATOR Russian patent published in 2002 - IPC

FIELD: measurement of level of liquid in transports. SUBSTANCE: capacitive level indicator of liquid has two-electrode variable-capacitance transducer, operational amplifier, stabilized power supply source, single-shot multivibrator and flip-flop. First electrode of two-electrode variable- capacitance transducer and element of negative feedback of operational amplifier are connected to its inverting input. Element of positive feedback of operational amplifier is connected to its non-inverting input. Second electrode of two-electrode variable- capacitance transducer is connected to case. Output of operational amplifier is connected to input of single-shot multivibrator and first input of flip-flop. Output of single-shot multivibrator is coupled to second input of flip-flop. EFFECT: raised accuracy of control over specified level of liquid. 2 dwg