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 velocity of dust" and "the gravitational sedimentation velocity 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 velocity of dust ■ Gravitational sedimentation velocity 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 size that can remain suspended in a clean room for a long time (of course, this 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 around 1 micron to 2 microns. For high-density, large particle size particles, gravity has a greater effect than diffusion. Without the influence of airflow, they should fall straight down. The suction force 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 sizes 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, searching for the culprit can lead to measurement results in static particle monitoring that may be "there, but not really there." Even in the presence of lateral airflow, the horizontal speed of the particles is the same as the airflow speed, while the vertical speed will be that of free fall, so again, the larger the particle size, 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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<It's just a particle counter, but it's still a particle counter> Particle Plus Inc. 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.