At present, there are many kinds of moisture analyzers with different principles on the market. Many customers choose the moisture meter when they choose the moisture meter, which is more suitable for their own use. As the computer network speeds up the communication and release of information, it also causes the real producers and distributors in the market to mix their eyes. Many dealers have not published the formal technical and after-sales training of the manufacturers, and they directly publish themselves on the website. Business, it is difficult to help end users choose the moisture meter that suits them. After the end user receives the moisture meter, they will find that the goods are not on the board and some counterfeit OEM products. At the same time, most dealers will call the manufacturer after-sales service. Changed to your own company phone, this will result in end users' technical support and after-sales service without timely and effective. Most customers encounter problems that are easy to solve in operation, but because the dealers are not willing to tell the end users to the manufacturers, the end users can not find the manufacturers, which makes the end users cause a big misunderstanding to the manufacturers. First of all, the product is not accurate and the stability is poor. Secondly, the after-sales service of the manufacturer is not good, not timely, not in place, and the attitude is poor. Therefore, it is recommended that customers purchase products directly, and try to directly choose the manufacturer to cooperate, so that the service is timely. Let's take a brief introduction to the principles and uses of various moisture meters so that you can choose the moisture meter that best suits your needs.
The moisture meter can be roughly divided into:
1. Halogen moisture analyzer,
2. Infrared moisture meter,
3. Far infrared moisture analyzer,
4. Near-infrared moisture analyzer,
5, Karl Fischer moisture analyzer,
6, capacitance moisture meter,
7, resistance moisture analyzer,
Brief description:
1, resistance moisture meter: is based on the size of the resistance to determine the size of the water. The shape of the product is rectangular, and the instrument is usually a long probe or two probes.
Features: easy to carry, cheap. There are tens of yuan, but also a few hundred yuan, the highest is only 2,000 yuan.
Use environment: generally used in the field, or a large number of incoming inspections (such as several tons or dozens of tons)
Use industry: grain acquisition, timber acquisition, chemical, paper batch incoming inspection.
Disadvantages: no precision, large error, only moisture measurement range, such as 3%-25%. Can only be used as an auxiliary tool.
2, capacitance moisture meter: the principle of the moisture meter is generally similar to the cup. The sample is poured in and the result will be available soon.
Features: cheap, fast. More than a thousand, the highest is only 2,500 yuan.
Use environment: In the wild, many small businesses are used for laboratory testing.
Use industry: grain purchase, tea purchase, etc.
Disadvantages: no precision, large error, only the approximate moisture measurement range, and a large number of standard samples for different samples before testing, there are strict requirements for the product accumulation state, so there is no truth. There are more food households in the Central Plains, and there are a small number of users in the Northeast.
Note: The above two moisture meters are currently used mainly in acquisitions in the market, but many growers now know that this moisture meter is inaccurate, so the product is facing a severe test.
3. The history of Karl Fischer Moisture Analyzer was in 1935, as long as it was used in the chemical industry to test the moisture of volatile substances. The preliminary period is mainly the capacity analysis and determination. Domestically produced cheaper two or three thousand dollars, but the quality of the producers mainly have Shandong Zibo split instruments, prices vary. Foreign is more expensive.
Karl Fischer can be divided into:
(1), volume method: divided into visual method and electricity method (2), Coulomb method: products with large water use this method is not very good.
Use industry: Karl Fischer moisture analyzer is suitable for moisture testing in volatile materials, such as toluene, xylene, paint and other industries.
Note: The moisture meter of this method requires consumables, and the consumables are chemical reagents, which are harmful to the human body. Therefore, enterprises that purchase this product generally need to provide certain protective measures for specific operators. So as not to cause serious consequences.
4. Near-infrared moisture analyzer: The moisture meter is an online moisture tester. It is mainly used on the production line to monitor the moisture of the product in real time. The near-infrared moisture meter requires high uniformity of the sample. A database should be established before installation. If the sample is replaced during the test, the data should be replaced. This product is often calibrated with an infrared fast moisture analyzer. In other words, when buying an online moisture meter, you should also buy a standard infrared moisture meter, and often calibrate the online moisture meter. At present, domestic production is less, mainly imported, but the price is very expensive, hundreds of thousands, this price is not affordable for ordinary companies.
Online moisture meter foreign technology matures earlier, especially in agriculture, because foreign agricultural products are mostly one variety, and there are many varieties in the same area in China, so the test is difficult. Representatives are from the UK and Germany.
Principle: According to the principle that the near-infrared wavelength will be absorbed by water molecules, the near-infrared energy change at a specific wavelength is analyzed.
Use industry: tobacco, ore, agriculture, etc.
5, far infrared moisture analyzer: generally used for laboratory product testing, but this type of product testing time is long, slow temperature rise, for some products with strict requirements and high moisture value, such as seeds, distiller's grains, etc., time too Long logarithmic values ​​have a big impact.
6, infrared moisture analyzer: the biggest difference between infrared and far infrared and near infrared is that its wavelength is not the same.
Infrared has a strong penetrating ability. Because the heated and dried substance absorbs far-infrared radiant energy at the same depth and at the same time, the self-heating effect is generated, so that the solvent or water molecules evaporate and the heat is uniform, thereby avoiding the thermal expansion. The deformation and qualitative changes caused by different degrees keep the appearance, physical and mechanical properties, fastness and color of the material intact.
The most representative manufacturer in the market: Shenzhen Guanya Electronic Technology Co., Ltd.
7, halogen rapid moisture analyzer: halogen moisture meter is a new variety in recent years, once listed, it has been favored by many companies. The heating source adopts a ring-shaped halogen tube, and 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. Industry: flammable, explosive, volatile, except for the use of the environment: laboratory, production line, etc. based on the above and the high cost performance of the halogen moisture meter, it also created a lot of domestic distribution. Manufacturers of counterfeit OEMs and third- and fourth-line manufacturers advertised on the Internet and used counterfeit halogen moisture meters for sale. After the customer buys it back, it is found that the goods are not right or even difficult to distinguish whether it is a halogen moisture meter. The market in Guangdong and Shanghai is particularly chaotic. Many dealers sell electric heating wire products to customers who say they are halogen moisture meters. Customers pay a few times more price. Because they are counterfeit and OEM products, they can’t reach the original. With halogen technical indicators, dealers generally do not dare to do phone tracking services and technical support work. It is recommended that customers buy products when they ask about the product's performance, brand, manufacturer and whether there is a production license for measuring instruments issued by the quality and technical supervision department. When signing the contract, the above content will be written into the paper to facilitate the later resolution of the dispute.
In addition, the three-wire and four-wire manufacturers use balanced magnetic sensors, which have the advantages of low price and disadvantages: easy to age and unstable. Customers can choose two or three thousand to choose this type.
8. At present, the domestic manufacturers of high-end moisture meters are as follows, which is convenient for everyone to refer to:
(1), Shenzhen Guanya Electronic Technology Co., Ltd. (2), Shanghai Precision Scientific Instruments
(1): METTLER (2): Sartorius