The fourdrinier Paper Making Machine is mainly used for making top grade corrugated base paper, test liner paper,medium paper, high quality light-weight paper (culture paper, newsprint, light weight specialty paper). This kind of peper machine needs to chosse papermaking type, dewatering structure of press section, arrangement of dryer cylinder group, sizing and finishing equipment according to different paper grades and operating speed requirements.
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The soil nutrient quick-detecting instrument has selected the product of the measuring instrument prototype test certificate and the measuring instrument manufacturing license. The country has strict management of the measuring instrument production. The soil-fertilizer instrument belongs to the measuring instrument and must be performed by the measurement product supervision and inspection department on the performance of the prototype. The reliability is verified by inspection. On the basis of qualified inspection of prototypes, the technical supervision department shall also assess production conditions such as production facilities, personnel technical level, technical documents, verification conditions, and management systems, and rectify deadlines that do not meet the requirements; The issuance of a measuring instrument manufacturing license. These two certificates are basic guarantees for product quality. Unlicensed products or products with incomplete certificates are irregular products and illegal products. It is dangerous to purchase such products.
It is important to check the stability of the soil nutrient tester. When the error is purchased, besides knowing the performance indicators through the publicity materials, it is important to check the stability of the instrument in the field. The method of inspection is: !! Turn on the power to warm up the instrument) (%$min., "Shutter the lid of the instrument, adjust the instrument so that the display reads zero, # observe changes in the reading of the instrument," the maximum and minimum readings of the instrument in minutes. The difference is divided by the full-scale reading, which is the stability error of the instrument.As the saying goes, the instrument is not afraid of inaccuracy, it is not afraid of instability, and instruments with unqualified stability cannot be used.
The speed measurement is based on the economical point of view under the premise of satisfying the test precision, so the accuracy test and evaluation must be based on routine analysis. Therefore, it does not have and cannot have the authority of the referee. This limits its application area. Therefore, it is worthwhile to analyze the accuracy of the soil nutrient tester. It is necessary to compare and analyze the soil nutrient tester to purchase the appropriate product.