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On the principle of grain viscometer by measuring
The time of issue:2012-06-21 9:47:06 view number:
Abstract: The grain is the survival of this very important, good storage, the viscosity change of the grain is an important guidance for safe grain storage. Use grain viscometer good determination of the viscosity changes, and the article describes the grain viscometer functional characteristics, design methods and parameters to help people understand to use instruments.
Grain during storage, its physical, chemical, physiological, biochemical nature prone to change, while the viscosity is one of the grain is extremely important physical properties, with the extension of storage time, the viscosity of grain will result in significantly decreased, while the gelatinization elevated temperature and water absorption, tasting score lower quality deterioration occurs. Therefore, the determination of grain viscosity is a sensitive indicator of the assessment of grain quality and storage stability, an extremely important significance in guiding the safe grain storage.
Determination of grain viscometer (GB/T5516-85) using Ostwald capillary viscometer method in the determination of the thermostatic device, pasting device, instrument parts and complicated operation, and poor control of the gelatinization process. In recent years, with scientific and technological progress inspection into the orbit of the instrumental analysis. LN-II viscometer, with a convenient, fast and accurate, gelatinization two sample results with good reproducibility, the ideal instrument for the determination of grain viscosity.
Grain viscometer capillary viscometer, and grain samples by grinding, pasting, filtration, and determination of the required time of the gelatinization flow through the capillary viscometer up and down the ball marking viscometer coefficient calculated by multiplying the grain viscosity. The main technical parameters of the grain viscometer as follows: Temperature range: room temperature for any set of ¡× 120 ¡æ; Temperature accuracy: ¡À 0.1 ¡ã C; timing accuracy: ¡À 0.1s; timing resolution: 0.1s; heating power: the main heater: 800W, auxiliary heater: 1000W; constant temperature bath: 20L, double; temperature sensors: precision platinum resistance, sub Number: PT100; stirring speed: 1300 rev / min; Working power supply: 220V ¡À 10%; 50Hz; ambient temperature: ¡× 40 ¡ã C at room temperature, relative humidity less than 85%.