Flow selection of dust particle counter

In clean environment monitoring, the flow rate selection of dust particle counters directly determines measurement accuracy, efficiency, and compliance. 2.83L/min, 28.3L/min, 50L/min, and 100L/min are the four most commonly used flow rate specifications in industrial and scientific research fields. The selection core should revolve around three dimensions: cleanliness level, monitoring range, and standard requirements, combined with scientific matching of instrument performance and scene characteristics. The following is a detailed technical analysis.

2.83L/min: The first choice for small flow precise monitoring. As the mainstream flow of handheld portable models, its core advantages are low disturbance and high precision, suitable for local areas and daily inspections. This flow rate can accurately capture the particle distribution in small spaces such as ultra clean workbenches and precision instruments, especially suitable for ISO 6-9 clean environments, meeting the strict requirements of semiconductor and optical component manufacturing for micro environments. According to GMP standards, the minimum gas production volume for C/D grade clean areas is only 6.9L, and the 2.83L/min model can complete sampling in 3 minutes, balancing efficiency and accuracy. Its lightweight design (usually within 1.5kg) and long-lasting battery make it more suitable for mobile inspection. Domestic equipment occupies over 90% of the market share with its high cost-effectiveness.

28.3L/min: Medium flow universal main force, 28.3L/min (equivalent to 1CFM) is the golden flow rate for online monitoring and routine detection, with both sampling efficiency and data representativeness, widely used in industries such as pharmaceuticals and electronics. This flow rate perfectly matches the ISO 14644-1 standard and can meet the minimum gas production requirement of 12L in Class B clean areas. It can be used for online fixed monitoring in sterile rooms or for multi-point sampling through portable models. Its resistance to VHP (vaporized hydrogen peroxide) and explosion-proof design make it a standard configuration for sterile rooms in biopharmaceuticals, enabling continuous data acquisition without affecting production, balancing detection coverage and environmental adaptability.

50L/min: A high flow and efficient detection tool, designed for large areas of Class A/B clean areas, pharmaceutical filling lines, and other scenarios. A flow rate of 50L/min can significantly shorten the detection cycle. According to ISO standards, a sampling volume of 1 cubic meter only takes 20 minutes, which is 40% more efficient than 28.3 L/min. It is suitable for clean room acceptance and periodic monitoring with multiple sampling points and a wide area. This flow model usually has dual flow switching function (50L/28.3L), compatible with different standard requirements, built-in high-precision digital flow sensor, ensuring flow stability under complex working conditions (error ≤± 5%), and is the preferred choice for efficient compliance monitoring in high-end manufacturing fields.

100L/min: Optimal for large-scale and rapid testing with ultra large flow rate. The 100L/min flow rate is designed to adapt to ISO 1-5 high cleanliness environments and large clean rooms. Its sampling efficiency is 3.5 times that of 28.3 L/min, and it only takes 10 minutes to sample 1 cubic meter, which can significantly reduce the time cost of multi area and high-frequency detection. This model is mostly designed for portable use, equipped with large capacity batteries and million level data storage. It supports automatic generation of UCL reports and fully complies with FDA 21 CFR Part 11 and GMP regulations. It is particularly suitable for scenarios such as aerospace assembly workshops and high-end pharmaceutical workshops that require high testing efficiency and data integrity.

Key principles for selection: prioritize selecting 50L/100L high flow rate for high cleanliness levels (ISO 1-5) to ensure sample representativeness; Choose 2.83L/28.3L for medium to low cleanliness levels (ISO 6-9) to balance cost and accuracy; Online monitoring is preferred at 28.3L/min, mobile inspection is preferred at 2.83L/min, and large-scale acceptance is recommended at 50L/100L. Strictly follow industry standards and instrument calibration specifications to ensure flow stability and data accuracy.