Experimental analysis of the characteristics and principles of the moisture analyzer
1. Capacitance moisture meter: The appearance of this principle of moisture meter is generally similar to that of a tea cup. The sample is poured in, and the result will be available soon.
Features: cheap and fast. More than one thousand, the highest is 2,500 yuan.
Use environment: In the wild, many small enterprises are used for laboratory testing.
Use industry: grain purchase, tea purchase, etc.
Disadvantages: no accuracy, large error, only approximate moisture measurement range, and a large number of standard samples must be made for different samples before testing. There are also strict requirements for the accumulation state of the product, so there is no authenticity. Grain households in the Central Plains use more, and there are a few users in the Northeast.
Note: The above two types of moisture meters are currently mainly used for acquisition in the market, but now many growers know that this kind of moisture meter is inaccurate, so the product is facing a severe test.
2. Resistance Moisture Meter: Determine the size of moisture based on the resistance value. This type of product has a rectangular shape. Generally, there is a very long probe on the instrument, and some are two probes.
Features: easy to carry and cheap. There are dozens of yuan, there are hundreds of yuan, the highest is only 2,000 yuan.
Use environment: generally used in the field, or a large number of incoming materials inspection (such as a few tons or dozens of tons)
Use industry: grain purchase, wood purchase, chemical industry, paper batch incoming inspection, etc.
Disadvantages: no accuracy, large error, only moisture measurement range, such as 3% -25%. Can only be used as an auxiliary tool.
3. The history of Karl Fischer Moisture Analyzer is from 1935, as long as it was used in the chemical industry to test the moisture of volatile substances. The early stage was mainly capacity analysis. The domestically produced prices are two or three thousand dollars cheap, but the good quality manufacturers mainly include Zibo Zifen Instrument in Shandong, with prices ranging. Foreign countries are more expensive.
Karl Fischer can be divided into:
(1), volume method: divided into visual method and electricity method
(2). Coulomb method: products with high water content are not very effective with this method.
Use industry: Karl Fischer moisture analyzer is suitable for moisture testing of volatile substances, such as: toluene, xylene, paint and other industries.
Note: The moisture meter of this method requires consumables. The consumables are chemical reagents, which are harmful to the human body. Therefore, companies purchasing this product generally need to provide certain protective measures for specific operators. So as not to cause serious consequences.
4. Near-infrared moisture analyzer: This moisture analyzer is an online moisture testing instrument. Mainly used in production line to monitor the moisture of products in real time. The near-infrared moisture analyzer requires high sample uniformity, and a database must be established before installation. If the sample is replaced during the test, the data should also be replaced. This product should often use infrared fast moisture analyzer to calibrate the data. In other words, when buying an online moisture meter, you must also buy a standard infrared moisture meter, which often calibrates the online moisture meter. At present, domestic production is relatively small, mainly imported, but the price is very expensive, hundreds of thousands, this price is not affordable by ordinary enterprises.
The foreign technology of the online moisture meter is relatively early, especially in agriculture, because foreign agricultural products are mostly one variety, and many varieties can appear in the same area in the country, so the test is more difficult.
Representatives are Britain and Germany.
Principle: According to the principle that near-infrared wavelengths are absorbed by water molecules, the change of near-infrared energy at a specific wavelength is analyzed.
Use industry: tobacco, ore, agriculture, etc.
5. Infrared moisture analyzer: The biggest difference between infrared and far infrared and near infrared is their different wavelengths.
Infrared has a strong penetration ability, because the heated and dried substances absorb the far-infrared radiant energy at the same time in the interior and surface molecules of a certain depth, resulting in a self-heating effect, which evaporates the solvent or water molecules and generates heat uniformly, thereby avoiding thermal expansion The deformation and qualitative change caused by different degrees keep the appearance, physical and mechanical properties, fastness and color of the material intact.
6. Far infrared moisture analyzer: generally used for laboratory product testing, but this type of product has a long test time and slow heating, which is not suitable for some products with strict requirements and high moisture value, such as seeds, lees, etc., the time is too The length has a great influence on the value.
7. Halogen Moisture Analyzer: Halogen moisture analyzer is a new type in recent years, which has been favored by many companies once it is listed. The heating source adopts a ring-shaped halogen tube, the heating is relatively uniform, and the performance is stable. But the price is slightly more expensive than infrared.
Features: ring heating, stable performance, short test time
Use industry: except for flammable, explosive and volatile industries
Use environment: laboratory, production line, etc.
(Organization of China Educational Equipment Purchasing Network)
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