Application of laser dust particle counter in biological clean room

With the development of modern biotechnology, biosafety has attracted the close attention of scientists and technicians in the biological field. Generally speaking, for the safety of biological experiments, experiments are usually carried out in clean rooms. A clean room is a place where people can work when the air cleanliness reaches a specified level, and its function is to control particulate pollution. Generally speaking, it can be divided into industrial clean room and biological clean room according to usage. The industrial clean room takes inanimate particles as the control object, while the biological clean room mainly controls the contamination of the work object by microorganisms.

The design and construction of the clean room should meet the standards. In order to improve the cleanliness level of the clean room, companies can reserve some rooms for future development, but the air purification system cannot be turned on at ordinary times; it should be designed and constructed according to the different requirements of different production processes and different production processes for environmental cleanliness.

It is worth noting that: 1. The "send back" method is not recommended. The benefits of "upload and return" are low cost and money saving, but it has many problems, such as too many particles, low wind speed in the working area, difficult to reach the standard, and longer self-cleaning time. 2. Pay attention to the air changes in the clean room. Air exchange rate, pressure difference and number of suspended particles are the basic requirements of a clean room. Whether it is turbulent dilution or single-phase flow displacement, the clean room needs to control and realize various parameters through the amount of clean air. Therefore, the air exchange rate of the clean room should not be too low.

In addition, the clean room also needs a lot of purification equipment, such as air inlet system, return air system, self-cleaning device, clean shed, buffer zone, etc. All of these are to produce and manufacture products in a good environmental space. In a clean room, we need instruments to measure the number and size distribution of dust particles in the air, which can provide a basis for the assessment of air cleanliness. The laser dust particle counter is an instrument that measures the number and particle size distribution of dust particles in the air.

The laser dust particle counter is a measuring instrument used to detect the air cleanliness level of clean room workshops, which can meet the needs of the pharmaceutical industry (pharmaceutical factories, drug control institutes, hospital operating rooms, etc.); electronics industry (semiconductor factories, precision machinery production and processing, etc.) ; Food hygiene industry (finish processing of dairy products, plastic-sealed meat food, seasoning food, agricultural products, etc.); filter manufacturers, inspecting the quality and efficiency of filters, etc.; finishing and precision testing in the fields of optics, aerospace, etc. The required clean room (area) testing needs.

According to the detection principle, laser dust particle counter can be divided into: light scattering method detection (white light, laser), microscope method detection, weighing method detection, DMA method detection (particle size analyzer), inertial method detection, diffusion method detection, condensed nucleus Method detection (CNC) and so on. According to the flow rate, it can be divided into: small flow 0.1cfm (2.83L/min) and large flow 2cfm (50L/min). According to the shape and size, it can be divided into: portable, handheld, and online. According to the test channel, it can be divided into: single channel (only test a certain particle diameter); dual channel (test two particle diameters); multi-channel (test multiple particle diameters).