In scientific research laboratories, invisible dangers often pose a greater threat than visible risks, and intelligent air purifying fume hoods are the first line of intelligent defense against such threats. The mortality rate of laboratory workers is 42.7% higher than that of the general population, and their average life expectancy is reduced by 10 years. The air pollution level in rooms containing chemical drugs is 100 to 400 times higher than that in ordinary rooms. Behind these shocking data lies the harsh reality of long-term exposure of researchers to harmful gas environments. As an efficient laboratory safety equipment, the intelligent clean air type fume hood adsorbs toxic and harmful gases and dust through molecular filters, forms clean air, and emits it, becoming a modern laboratory safety guarantee.

1、 Working principle and technical characteristics

The core working principle of intelligent air purifying fume hood is based on two concepts: source control and molecular level filtration. The air in the laboratory enters the cabinet through the inclined front door opening, and 1-4 fans are installed to form an internal circulation system. The fume hood creates a negative pressure environment inside the cabinet through the operation of fans, making it difficult for external air to easily enter the cabinet. This design ensures that toxic and harmful chemical gases, dust, and other pollutants generated during the experimental process are extracted into the filtration system of the fume hood. The filtration system is the technical core of intelligent air purifying fume hoods. Activated carbon, as the main filtering material, has a well-developed internal pore structure and a huge specific surface area. After 1 gram of activated carbon material is unfolded, the surface area can reach up to 800-3000 square meters. This structure endows activated carbon with excellent adsorption performance, and its working principle relies on the intermolecular interaction force (van der Waals attraction). When a molecule is captured by the pores of activated carbon, more molecules will be attracted until the pores inside the activated carbon are filled.

2、 Main structure and technical parameters of the equipment

The structural design of intelligent air purifying fume hood balances safety and practicality. The main body of the equipment is made of galvanized steel plate with acid and alkali resistant coating. The front and side plates are mainly made of ≥ 6mm acrylic plate, which has excellent chemical resistance performance. The countertop of the fume hood is made of epoxy resin, which has excellent chemical stability, corrosion resistance, and high temperature resistance. The standard sizes of fume hoods are diverse to meet the needs of different laboratories. Common models include 8006202080mm (YB-DS800), 16207501345-1514mm (633 model), etc. The key performance parameters include an air handling capacity of generally 230m ³/h (up to 690m ³/h for large models), an average surface wind speed maintained within a safe range of 0.4-0.6m/s, and compliance with standards such as AFNOR NF X15-211:2009. In terms of electrical parameters, the equipment voltage is generally between 220V-240V, the power is between 42W-160W, PSC fan is used, the current is 24 volts, the performance is stable and silent.

3、 Intelligent monitoring and security warning system

The prominent feature of modern intelligent air purifying fume hoods is their intelligent monitoring system. Taking the Elab SMART series as an example, information is transmitted through the flashing of the halo on the top of the fume hood. A stable halo indicates normal operation, while a flashing halo indicates an alarm state. The intelligent fume hood is equipped with multiple sensors and alarm functions, which can monitor the surface wind speed, fan operation status, filter saturation, etc. in real time. When abnormal situations such as abnormal wind speed, fan failure, or filter saturation occur, the equipment will alert the user through different alarm sounds. Some models are equipped with a seven inch LCD touch screen, which can display real-time temperature and humidity, VOC concentration environmental data, and equipment operating status. Some products also support eGuard application, which enables remote online monitoring of the status of fume hoods. Users can receive alarm reminders and make program settings through their mobile phones, tablets, and computers. The monitoring of filters is particularly precise, equipped with specialized alarms for different types of chemicals, such as Molecode S for organic, Molecode A for inorganic, and Molecode F for formaldehyde saturation detection.

4、 Maintenance and usage suggestions

The normal operation of intelligent air purifying fume hood relies on regular maintenance. After daily use, it is necessary to clean the surface and filter of the fume hood, including the outer shell and wiping the glass door. It is crucial to regularly clean the entire interior of the fume hood and keep the work area clean. High efficiency filters can adsorb small particles such as dust and odors in the air, and need to be replaced at regular intervals to ensure filtration efficiency. For the electrical system of the fume hood, all electrical facilities related to the fume hood, such as power lines, control systems, and lighting fixtures, should be regularly inspected to ensure normal operation and avoid accidents caused by electrical failures. The sealing strip of the cabinet door needs to be cleaned regularly, as dust and debris may accumulate in the gaps, leading to a decrease in sealing performance. It is recommended to clean the glass door with soapy water to maintain transparency and sealing. In addition to daily maintenance, professional maintenance is also required within the prescribed time period, including replacing mechanical components, lubricating bearings, calibrating sensors, etc. For the maintenance of key components, it is recommended to hire manufacturers or professionals to ensure long-term stable operation of the equipment.