The design principle of the airborne microbial sampler is based on the particle impact principle and isokinetic sampling theory. Its core is to efficiently capture microbial particles in the air through physical means and ensure that the sampling results truly reflect the concentration of environmental microorganisms. The following is a detailed analysis of its design principles and advantages:

1、 Design principle of airborne bacteria sampler:

1. Principle of particle impact

The sampler draws in air at a constant flow rate through a built-in air pump. When the airflow passes through a microporous membrane or impact plate, suspended microorganisms are intercepted due to inertia. Some devices use graded impact technology (such as Anderson impact method) to classify and capture microorganisms of different particle sizes, improving detection accuracy. For example, a certain model of sampler impacts bacterial containing air onto the agar surface of a culture dish through 397 micropores, achieving dynamic rehydration and separation of microorganisms for cultivation.

2. Isokinetic sampling theory

The sampling port wind speed should be consistent with the ambient wind speed (with an error of<± 5%) to avoid data deviation caused by airflow differences.

3. Kinetic energy rehydration and cultivation

After sampling is completed, the culture dish is sealed and placed in the incubator. Microorganisms recover and reproduce by absorbing water from the agar, forming visible colonies for analysis. This process shortens the detection time and improves efficiency.

2、 Core advantages of air floating bacteria sampler:

1. High sampling efficiency

Efficient capture of microorganisms: The principle of particle impact ensures that microbial particles are directly intercepted, and the sampling efficiency is increased by more than 40% compared to traditional equipment. For example, a certain brand of sampler has a capture rate of up to 92% for fragile microorganisms such as mycoplasma.

Graded capture technology: By using graded impact plates or microporous designs, microorganisms of different particle sizes can be classified and captured to improve detection accuracy, making it suitable for monitoring complex environments.

2. High data accuracy

Isokinetic sampling design: The sampling port wind speed is consistent with the environmental wind speed to avoid data deviation caused by airflow differences and ensure that the sampling results truly reflect the concentration of environmental microorganisms.

Intelligent airflow control: Real time monitoring of flow rate through PID closed-loop control system, automatic adjustment of pump speed to counteract the effects of temperature and air pressure changes. For example, a certain model of equipment has been tested in high-altitude areas at an altitude of 3000 meters, and the flow stability is better than ± 2%.

3. Convenient operation and intelligence

Humanized operation interface: equipped with a touch screen, supporting bilingual operation in Chinese and English, built-in GMP/ISO14698 and other standard templates, can automatically generate electronic reports that comply with FDA 21 CFR Part 11 specifications.

Data management and export: Supports exporting ≥ 500 sets of data from USB flash drives for convenient historical analysis; Some models are equipped with thermal printers that can print data on site.

Flexible sampling mode: Users can choose sampling time, flow rate, and volume based on environmental characteristics to meet diverse detection needs.

4. The air floating bacteria sampler has strong adaptability and high safety

Explosion proof and sterilization design: For flammable environments such as chemical workshops, some models use explosion-proof batteries and sealed structures; The sampling head supports high-temperature and high-pressure sterilization at 121 ℃ to avoid cross contamination.

Wide environmental adaptability: The AC/DC dual-use design is matched with a large capacity lithium battery, which can continuously sample and is suitable for environments ranging from -20 to 50 ℃.

Portability: With a light overall weight and compact size, it is easy to carry to different places for sampling work.

5. Economy and scalability

Save consumable costs: You can use 90mm standard culture dishes to make consumables in the laboratory, reducing long-term usage costs.

Multi functional scalability: supports different culture media to detect various bacteria in the air, meeting the diverse needs of microbial testing.