The industrial online conductivity meter is a kind of online water quality monitor with a microprocessor. The meter is equipped with conductivity electrodes of different types and constants for continuous monitoring and control of the conductivity and temperature of aqueous solutions. Widely used in power plants, petrochemicals, metallurgy, paper, environmental protection and water control, light industry, and other fields. For example, it is used in power plant cooling water, make-up water, saturated water, condensate water and furnace water, seawater distillation, and other water-making equipment raw water and water quality monitoring and control. The instrument has current or voltage output, the measuring range can be set arbitrarily, the high and low over-limit alarm and two sets of relay control switches, can adjust the hysteresis range; According to the needs of users, various forms of installation process conductivity electrodes such as [flow] [tube] [sink] [flange] can be provided.