METHOD OF DETERMINATION OF LEVEL OF LIQUID AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 1996 - IPC

FIELD: measurement technology. SUBSTANCE: electrodes connected to three-phase power supply source are dipped into tested medium and value of current flowing through electrodes is found. Resistance of first electrode is changed K times as compared with resistances of second and third electrodes which are fabricated identical. In agreement with first version value of change of resistance R_f, of first electrode with which summary current flowing through electrodes when they are connected to three-phase power supply source by star-to-star circuit with zero wire is equal to zero is determined. In compliance with second version value of change of resistance R_f is found with which difference of potentials between zero points of three-phase power supply source and "star" of electrodes when they are connected by star-to-star circuit without zero wire. Level of liquid l_x is found by formula l_x, where 1 is length of electrodes; S is area of cross-section of electrodes; ρ is specific resistance of electrodes. Device for implementation of method is described in formula of invention. EFFECT: enhanced authenticity of method and reliability of device. 3 cl, 11 dwg