There is still no device for directly measuring the water activity by putting it inside the food. The water activity is determined by an indirect method, in which the sample is placed in a closed container until the apparent balance is reached (sample constant weight) After the pressure or relative humidity in the container is measured. The main application detection methods and instruments are: water activity meter (or improved new water activity automatic detector), diffusion method, solvent extraction method, formula simulation method and freezing point method.
The traditional diffusion method is China's national standard method. The feature is higher accuracy, but the method is old, time consuming, and complicated to operate. The most widely used method in the world is the mirror condensation dew point instrument method. China is also aligning with international standards. In the past two years, it is also about to introduce the instrumental methods for measuring the grain water activity and drug water activity. The new water activity standard, using the most widely used Aqualab mirror condensation dew point instrument, will greatly improve measurement accuracy and measurement time. The accuracy is 0.003 and the measurement time is 5 min. This instrumentation method is not only accurate and repeatable, but also easy to operate and time-consuming. It will be more suitable for process control on the production line for fast and accurate inspection.
Beijing Jiuzhou Space Science & Trade Co., Ltd. specializes in the production and sales of online groundwater monitors, Caipos weather monitoring and agricultural environmental instruments, online dust noise automatic monitors, tubular soil moisture temperature monitors / multi-layer soil monitoring systems, mobile automatic runoff observation systems , online soil erosion monitor, dump automatic flow meter / community dump runoff, small diameter flow sediment automatic monitor, steel ruler water level gauge, automatic rainfall station, portable flow meter, portable weather station, soil nutrient speed meter, gas sampling Cylinders, lubricants, three-stage filter barrels, etc.
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