Multi-stage liquid level conductivity measurement device for nonuniform solution

Abstract

The invention discloses a multi-stage liquid level conductivity measurement device for a nonuniform solution. The multi-stage liquid level conductivity measurement device comprises a multi-electrode glass tube, a multi-channel switcher, a gear switcher, a temperature collector, a microcontroller and a PC (Personal Computer) upper computer, wherein the multi-channel switcher is used for switching a plurality of independent channels on the multi-electrode glass tube, the gear switcher is responsible for regulating the gear suitable for the current liquid level, the temperature collector is used for collecting temperatures of an environment and the channels, the microcontroller is used for generating drive signals, coordinating the control relationship between the modules and collecting and calculating the conductivity value of each liquid level, and finally the microcontroller is used for transmitting the conductivity value and the temperature value of each liquid level to the PC upper computer through a serial port for being displayed and analyzed. The multi-stage liquid level conductivity measurement device ensures that no common port exists among the channels which are completely independent, and avoids errors caused by mutual influence of multiple drive signals in the solution. The multi-stage liquid level conductivity measurement device has the advantages of simple structure, good measurement accuracy and low manufacture cost.

Description

technical field [0001] The invention relates to the technical field of automatic measurement and control, in particular to a device for automatically measuring the conductivity of different liquid surfaces of inhomogeneous solutions at the same time. technical background [0002] Most of the solution conductivity measuring instruments currently on the market are for the measurement of the conductivity of uniform solutions. The general measurement method is to insert a pair of electrodes into the measurement solution, and continuously apply excitation signals between the electrodes to convert the conductivity. conductivity value of the liquid surface. Even a general multi-channel measuring instrument simply replicates the above-mentioned single-channel mode. Because its multiple pairs of electrodes usually have a common terminal and are not independent, there are excitation signals between multiple pairs of electrodes at the same time. This method is generally applicable to ...

AI Technical Summary

Problems solved by technology

If the above method is used to install multiple electrodes of ordinary equipment or multi-channel equipment on different liquid levels of a solution for measurement at the same time, due to the mutual interference of multiple excitation signals between multiple pairs of electrodes, the measurement results will be affected. Large deviation, and the equipment and instruments required for measurement are complex, occupy a large volume, and cost high

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