It is the settling distance per unit time by particle diameter! The particle counter detects "suspended particles" that enter the sensor, but it cannot capture those that are falling.
This document introduces particle sedimentation and particle counters. It presents "the gravitational and centrifugal sedimentation velocities of dust" and "the gravitational sedimentation velocities of fine particles" along with graphs. Additionally, it provides a detailed explanation of "the sedimentation distance of particles per unit time." We encourage you to read it. 【Contents】 ■ Calculated sedimentation distance of particles (density 1.0g/1.0cm3) ■ Gravitational and centrifugal sedimentation velocities of dust ■ Gravitational sedimentation velocities of fine particles ■ Sedimentation distance of particles per unit time *For more details, please refer to the PDF document or feel free to contact us.
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For example, the particle diameter that can remain suspended in a clean room for a long time (which of course depends on density) is not very large. Empirically, particles that can remain suspended for hours or even tens of hours, assuming a density of 1.5, are at most about 1 micron to 2 microns in size. For high-density, large particle diameter particles, gravity has a greater effect than diffusion. Without the influence of airflow, they should fall vertically downwards smoothly. The suction power of a particle counter cannot bend this line segment to suck them in. In other words, please consider that the concept of constant-speed suction for small particle diameters does not hold. Depending on where you observe in the time series (for example, in exhaled breath with intense interaction with the environment), what size particles you target, and to put it more bluntly, the search for culprits can lead to measurement results in static particle monitoring that may be "there, but not there." Even in the presence of lateral airflow, the horizontal velocity of the particles is the same as the airflow velocity, while the vertical direction will be at free fall speed, so again, the larger the particle diameter, the quicker it will fall nearby. However, this description only pertains to solid particles.
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For more details, please refer to the PDF document or feel free to contact us.
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"Just a particle counter, but still a particle counter" Particle Plus Co., Ltd. designs and manufactures particle counters and air quality monitoring instruments equipped with advanced sensors and a wealth of features. We provide technology, expertise, and services to production environments and living spaces that require clean environments, such as life sciences, food and beverage, pharmaceuticals, indoor air quality, atmospheric environment, industrial hygiene, cosmetics, semiconductors, aerospace, and data storage industries. Our company helps you stay ahead of the times by offering unique particle sensors, counters, and insights based on cutting-edge technology.