DEVICE FOR MEASURING CONDUCTIVITY AND IMPEDANCE OF ELECTROLYTE AND BIOLOGICAL FLUIDS SOLUTIONS Russian patent published in 2021 - IPC A61B5/00 

FIELD: medical technology.

SUBSTANCE: invention relates to medical technology. The device for measuring the conductivity and impedance of electrolyte solutions and biological fluids contains two electrodes with the possibility of placing them in a container with an electrolyte solution or in a biological fluid, a constant voltage source, a current meter and an electrode voltage meter, an alternating voltage generator of low and infra-low variable frequency, an alternating voltage generator high frequency, a measuring resistor connected in series with a current meter, a constant voltage source and with electrodes, an AC measuring transformer connected by the primary winding to a measuring resistor, a capacitor connected to the terminals of the secondary winding of the transformer, a narrow-band high-frequency preamplifier connected by an input to the secondary winding of a transformer, a synchronous detector connected by a measuring input to the output of a narrow-band preamplifier, a DC amplifier connected by an input to the output of the synchronous detector, two-coordinate current versus time recorder connected to the output of the DC amplifier, a phase shifter with a voltage phase meter connected by the input to the output of the high-frequency generator, and the output to the control input of the synchronous detector.

EFFECT: invention increases sensitivity of the device for determining the conductivity of electrolyte solutions for direct and alternating current and expanding its functionality.

1 cl, 1 dwg