This is the material used at the luncheon meeting of the Japanese Aerosol Society (JAAST) held at the Himeji Chamber of Commerce from August 27 to 29 (although it was not displayed on the screen due to system issues). While light scattering particle counters have aspects that are not well-suited for aerosol measurement, they have become essential in the field of contamination control, where in-situ capability, compact size, and ease of use are required. However, they are primarily used in clean rooms, and measuring larger particles in a wider range of environments was previously considered unconventional. We have been using particle plus fine particle counters that can handle high particle concentrations and larger particles in various harsh environments, accumulating various insights. This is a simplified document summarizing some of those insights.

Basics of Air Filters

Particle Plus is expanding its scope from clean rooms in sterile process monitoring, electronics, precision, and chemicals to large particle detection in batteries, painting, and printing, as well as ultra-high concentration areas such as air pollution monitoring. To make it easier to select models, I have created a reverse lookup list.

"5nm Detection Adiabatic Expansion Type Pulse Mode CPC" Adopts new technology different from conventional CPCs, eliminating the possibility of false counts (nucleation-free) to the utmost extent, and detecting particles as small as 5nm.

Particle counters cater to a variety of applications, from high cleanliness environments in clean rooms to large particle detection and air pollution monitoring systems. There are various options available, including detection particle size, flow rate, number of particle size categories, and corresponding concentrations. We have prepared a list of models.

Clean rooms, of course, as well as machining environments, hospital wards, experimental environments, the Antarctic research vessel "Shirase," and atmospheric observations using drones have all come to be used in various settings.

This is the material used in a presentation meeting in Vietnam in March 2025. It includes examples from the optical thin film process and measurements used. The features of the Particle Plus counter, such as its wide concentration range from high purity to ultra-high concentration, long battery life, one-second measurement, and large memory capacity, can be either utilized or wasted depending on how it is used. There are various challenges in aiming for simple high purification in optical processes. Ideas about processes where the counter can be used and know-how to obtain usable data are all present on-site. Please feel free to reach out. We would be happy to collaborate.

The Dascar 200 and Dascar 300 will be discontinued. Discontinuation date: End of March 2022 Replacement products: (1) Dascar 100 Automatically measures foreign particles larger than 100μm in 50μm increments, collected using the Dust Sampler DSW-01 (for Dascar 100). (2) Dascar 100 BLACK Automatically measures foreign particles larger than 100μm in 50μm increments, collected using the Dust Sampler BLACK or the Dust Sampler DSW-01 (for Dascar 100).