Before using the soil bulk density measurement sampler, you should first obtain a sample with a larger diameter and length, and a sampling depth of 2 meters. It will be easier to drill into the soil with an impact hammer, and it will not be difficult to take it out. The sample is in a relatively loose position. It is very easy to take out from the cylindrical cylinder. By collecting one sample, you can study the entire soil profile, which saves time and reduces sample damage than digging a sampling pit. The soil bulk density sampler can be effectively used for all types of soil. It works in a slit based on the standard impact method and effectively captures microbial aerosol particles of 1 micron or smaller. The patented pneumatic technology ensures that the collected bacteria particles do not overlap.
Free oscillation occurs through the mutual conversion process of electric field energy and magnetic field energy. To maintain the oscillation, an amplification circuit with positive feedback is required. Since the parameters of the auxiliary devices cannot be completely consistent, the states of the two auxiliary samplers change at the moment of power-on. This change becomes more and more intense due to the effect of positive feedback, leading to a temporary steady state. During the temporary steady state, another auxiliary sampler is gradually charged by the capacitor and then turned on or off, and the state flips to another temporary steady state. Therefore, the particle size range it collects is naturally wider than that of a single-stage sampler, which is unmatched by some single-stage soil bulk density samplers. The circular nozzle of the soil bulk density sampler has a higher sampling efficiency than the slit type nozzle. The relative humidity increases step by step during sampling, which is very beneficial to fragile pathogenic microorganisms.