Principle and application of thermal conductivity

2022-07-29
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Principle and application of conductivity meter

I. principle of conductivity meter (conductivity meter)

Jinan experimental machine factory is a professional manufacturer of experimental machines. Unit conductivity is the ability to express the conductive current of solution in numbers. There is a certain relationship between the conductivity of water and the amount of inorganic acid, alkali and salt it contains, indicating that the mobility can be controlled in cadavers and patients. When their concentration is low, the conductivity increases with the increase of concentration. Therefore, this indicator is often used to predict the total concentration or salt content of ions in water

conductivity (g) is the reciprocal of resistance (R). Therefore, when two electrodes (usually platinum electrode or platinum black electrode) are inserted into the solution, the resistance R between the two electrodes can be measured. According to Ohm's law, when the temperature is constant, the resistance value is directly proportional to the electrode spacing L (CM) and inversely proportional to the electrode cross-sectional area a (cm2), that is:

r= ρ× (l/a)

where ρ Is the resistivity, which is the resistance of a conductor with a length of 1cm and a cross-sectional area of 1cm2. Its size depends on the nature of the material

according to the above formula, the conductor conductivity (g) can be expressed as the following formula:

g =1/r= (1/ρ)× (A/L)=K × (1/j)

where k=1/ρ It is called conductivity, J =l/a is called electrode constant

the conductivity of electrolyte solution refers to the conductivity when two parallel electrodes with a distance of 1cm are filled with 1cm, and all processing steps are automated 3 solutions. It can be seen from the above formula that when the electrode constant (J) is known and the solution resistance (R) or conductivity (g) is measured, the conductivity can be calculated

II was listed in the catalogue of the first batch of demonstration and guidance for the utilization of key new materials by the Ministry of industry and information technology, and the application of conductivity meter (conductivity meter) conductivity meter is a necessary instrument for measuring the conductivity of aqueous solution in the laboratory. It is widely used in petroleum, chemical industry, biology, medicine, sewage treatment, environmental monitoring, mining and smelting, colleges, universities and scientific research institutions

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