Remote on-line analytic detector for conductivity, pH value and oxygen dissolving value

Abstract

The remote on-line analysis and detection instrument for conductivity, pH value and oxygen dissolving value includes primary meter electrode probes and secondary instrument. It features the network interface RJ45 for the connection of CPU to upper computer; the CPU connected to RS485 bus via output module with analog quality output of 4-20 mA, display interface as processor digital bus, and the connection between the CPU and CAN bus; the in-situ data acquisition, front end multistage operation amplifiers and A / D converter set inside the electrode probe of the primary meter; and the split primary meter and the secondary instrument. The CPU is embedded ARM chip and thus has less peripheral devices, less signal interference and high reliability. The present invention has rich industrial interface, the flexible configuration of electrode with the secondary instrument, DCS, industrial control computer and other industrial control equipment and system, multimode display of the acquired signal, etc.

Description

technical field [0001] The invention relates to a remote on-line analysis detector for continuous monitoring of conductivity value, pH value and dissolved oxygen value of softened water, steam condensed water, seawater distillation, raw water, power plant supply water and deionized water, etc., belonging to the instrument technology field. Background technique [0002] Online analysis and detection instrument monitoring has become the main means of water vapor quality supervision in factories and enterprises, supplemented by a small amount of manual analysis. After the online instrument is put into use, the operating personnel should regularly check and maintain, adjust the temperature and flow of the water vapor sample, and when the instrument shows a certain change in the data, manually analyze whether the water vapor sample has quality changes, and judge whether the online instrument has occurred. Fault. When it is confirmed that the online instrument is faulty, it shou...

AI Technical Summary

Problems solved by technology

Electrodes of online meters are easily scalded by high-temperature water samples. If the temperature of water samples is too high (sometimes up to 60°C), it is difficult to compensate the temperature of the meter. The activity of the measured substance in the water samples is also affected, and the accuracy of online meters decreases.

In addition, due to the pollution of aqueous solution, etc., the maintenance and replacement of the meter electrode is extremely cumbersome.

Due to the above factors, the application and maintenance costs of the existing online instruments are relatively high, and the existing on-line detection instruments such as conductivity meters, PH meters, dissolved oxygen meters, etc. Large size, slow detection speed, low precision, signal is subject to external interference, unable to connect with modern communication networks, etc.

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