PH meter and conductivity meter are commonly used scientific analysis instruments widely used in scientific experiments, environmental monitoring and production. The use and verification of PH meter and conductivity meter are inseparable from their respective solutions, and the pH value and conductivity of the solution are closely related to temperature. When the temperature changes, the PH value and conductivity will change differently. In the process of metrology verification, we found that the correct use of the temperature compensator of the two instruments has a great influence on the measurement results, and some instrument users, due to incorrect understanding of the principle of the temperature compensator and the difference between the two, use Improper, resulting in inaccurate measured data, so it is crucial to correctly understand the principle and difference of temperature compensator.

COD is an indicator that measures the amount of organic matter in the water. The higher the COD, the more serious the water body is polluted by organic matter. Toxic organic matter enters the water body, which not only harms the organisms in the water body such as fish, but also can be enriched in the food chain and then enter the human body, causing chronic poisoning.

dissolved oxygen is very important in the process of water quality monitoring.For fish in water, dissolved oxygen needs to be greater than 4 mg/L to ensure their normal life activities,The main measurement methods of dissolved oxygen in water are: iodine measurement method, electrochemical probe method, conductivity method and fluorescence method. Iodine measurement was the first method used to measure dissolved oxygen in water and is the benchmark method for measuring dissolved oxygen in water.When water contains reducing substances such as sodium nitrite, sulfide, thiourea, humic acid, or tannin, it can greatly interfere with the iodine titration data. In this case, the electrochemical probe method is recommended. Electrochemical probe method is widely used in practical work due to its fast measurement speed, stable results, accurate data and less interference.

Principle and function of temperature compensator for pH meter and conductivity meter

Chloride ion concentration in water,Widely used in sewage treatment, hot springs, mineral development, metallurgical industry, industrial wastewater treatment process control and other discharge monitoring fields.