Working Principles (I) Analytical principles In the classical Karl Fischer capacity titration process, iodine reacts with sulphur dioxide in the presence of water as follows:

H2O I2 SO2 CH3OH 3RN→2RN·HI RN·HS04CH3 ....................... (1)

The iodine required for the reaction is supplemented by the addition of a standard solution containing iodine.

This instrument is a coulometric method. After the sample is dissolved in an electrolyte containing a certain solvent containing certain iodine, water is consumed as iodine. The required iodine is no longer titrated with standard iodine-containing reagents, but through the electrolysis process. To oxidize the iodide in solution to iodine:

2I———2e—→I2..................................................................(2)

The iodine produced reacts with the water in the sample and the end point is indicated with a double platinum electrode. When the concentration of iodine in the electrolyte returned to its original concentration, the electrolysis was stopped. Then according to Faraday’s law of electrolysis:

m=×=

Where: m - weight of water in the sample, mg;

C - Electricity consumed by electrolysis, mc;

M - the molecular weight of water;

n - number of electron transfer;

i - electrolytic current, mA;

t - electrolysis time, s;

96500 - Faraday constant;

10722 - The amount of electricity consumed to electrolyze 1mg of water, mc.

By entering the required parameters into the instrument microcomputer, the moisture content of the analysis sample can be expressed in ppm or %, μg.

Micro moisture analyzer is the latest generation of intelligent moisture analyzer combined with micro-coulomb principle and single-chip microcomputer technology. It features high sensitivity, fast analysis speed, accurate results and easy operation. Widely used in petroleum, chemical fertilizers, chemical industry, electric power, metallurgy, medicine, geology, college teaching and other fields. Executive Standard: SH/T0246.

Second, performance characteristics:

High sensitivity, fast analysis, accurate results, and easy operation.

High and low moisture content can accurately measure the trace moisture analyzer is a new generation of intelligent moisture analyzer based on microcoulomb titration principle, dual platinum electrode detection titration process, using micro-computer control electrolysis and data processing system.

The instrument automatically corrects the baseline. The operating parameters and analysis results are displayed on the printer in addition to the liquid crystal display. The instrument has the advantages of high sensitivity, good stability, accurate results, simple operation and rapid analysis. The instrument can be used for the analysis of water content in petroleum and petrochemical products. It can also be used to monitor the moisture content of substances in the production and scientific research of chemical, food, electric power, metallurgy, medicine, health and environmental protection systems.

An excavator is a construction machine used to excavate soil. This is to use the bucket teeth on the bucket to cut the soil and put it into the bucket. After filling the soil, lift the bucket and turn it to the unloading site to unload the soil. Then the turntable is rotated, and the bucket is lowered to the excavator surface for the next time. Operation.
Mainly used for engineering construction. Such as: highways, bridges, buildings, breeding ponds, underground engineering, emergency excavation and so on. The main features of excavators are that they are powerful and efficient. They can complete projects that cannot be completed by human beings and improve work efficiency. General engineering teams, construction industry, emergency departments, and even private individuals (excavation and breeding, roads, reclamation) all need excavators.
According to statistics, 60% of the earthwork in construction is done by excavators. In addition, the excavator can also perform various operations such as lifting, piling, ramming, pulling piles, pouring, installation, crushing, demolition, and crushing after replacing the working device.