The fume hood is mainly composed of water, electricity, gas ventilation system, equipped with multifunctional power sockets, easy to use other electrical equipment in the laboratory process, the use of quick-opening valve, so that the laboratory process of water is convenient, the front file plate for the up and down movement of the glass door, the top of the low-speed fan, can be experimental process of smelly gases smoothly discharged, stainless steel sinks are installed at the bottom of the work surface, disinfectant, experimental The bottom of the working surface is equipped with a stainless steel water tank, which can discharge the disinfectant solution and experimental residues from the drainage tank through the father of the water, protecting the experimental environment safely and reliably. And when the operation window is fully closed, the upper and lower part of the wind at the same time, will not be negative pressure caused by noise and glass window vibration phenomenon.
Working principle of fume hood control system:
1. Through the surface air velocity control system to continuously monitor the fume hood actual air discharge, according to the height of the window to calculate the average surface air velocity of the window opening area, when the pressure of the exhaust pipeline changes or changes in the height of the window, the system in ≤ 1S time to make a response, timely adjustment of the damper openings to maintain the window openings area of the average surface wind speed stable. Stable.
2. Different experimental conditions, can be equipped with different parameters on the panel.
3. The system through the infrared monitor, when there is an operator working in front of the fume hood, the surface wind speed control at a certain set value (0.5m/s), when no one operates in front of the fume hood, the system automatically converted to another set value (0.3m/s) in order to save operating costs.
4. When the fume hood door is closed, the air volume valve should maintain the minimum exhaust air volume of the fume hood, 300CMH for 1500mm fume hood.
5. Due to the failure of the surface of the wind speed is too high or too low, there are sound and light alarms.
6. Fume hood temperature is too high with sound and light alarm.
7. Fume hood door level is too high with sound and light alarm.
8. When the face of the abnormal situation, open the emergency discharge mode control, the system will open all the dampers, fume hoods maximum air volume, not subject to the face of the wind speed control.
Because the fume hood needs to be cleaned and disinfected frequently, there is the most important safety issues, in the customization should choose a good quality fume hood, according to the different materials, general common wooden fume hood has been unable to meet the needs of the laboratory, the current use of the more common is the all-steel fume hood, and like some of the cleanliness requirements of the laboratory will choose stainless steel, in the process of experimentation, can better ensure that the experiments are carried out, and can also be used to improve the quality and safety of the fume hood. In the process, can better ensure the quality of the experiment, and better maintenance.
We all know that the Achilles' heel of all-steel fume hoods is easy to rust, contact with water will be rusty, where in the production time, the surface of the steel plate will be sprayed with a layer of epoxy powder, after drying, its surface is smooth, not easy to fall off, in order to achieve the effect of rust, and for some of the higher concentration of chemical reagents in the laboratory, it is recommended that when choosing the material, the combination of the material's corrosion resistance to be selected.
On safety: laboratory personnel for a long time to stay in the laboratory, exposure to different concentrations of reagents, and these reagents are corresponding to some of the hazards and flavor, indoor ventilation has become a very important issue, to maintain the cleanliness of the indoor air is the primary consideration, which also requires the use of the fume hood principle of operation. Secondly, should be set up in the sink next to the eyewash and safety shower, when the experiment reagents accidentally splashed on the skin or eyes, to take emergency measures, can reduce the degree of reagent damage to the experimental personnel.