Publish Time: 2022-01-21 Origin: Site
When experimenting in the laboratory, there may be a lot of easily volatile harmful objects. If the minimum threshold of these easily volatile harmful objects reaches 50 parts per million, the laboratory must be opened quickly. Fume hood or some other equipment capable of exhausting air.
If there are some toxic gases or volatile substances in the fume hood, even if the fume hood is not in use, has not been opened, or there is no test operator in front of it, there is no way to determine the safety in the laboratory. Therefore, the fume hood cannot be turned off.
In this way, it can be ensured that the staff in the laboratory will not be corroded by the uncomfortable objects and toxic gases in the fume hood. The fume hood also has a very good function, which is when the fume hood is used normally. , If there is a splash reaction of chemical substances in the laboratory, the fume hood will immediately turn on its own protective function, which can protect the safety of laboratory staff.
If there are often tests involving chemical substances in the laboratory, which are prone to produce various harmful substances, on average, every two experiment workers need to be equipped with a fume hood, and the fume hood must be large enough to be able to do so. Ensure that each test staff can have a range of activities of 0.8 size. If the laboratory is too small and cannot meet this condition, it is necessary to configure other local types of exhaust devices.
We must always limit and monitor the production of harmful objects in the laboratory. The best thing is to leave the fume hood open for a long time, so that the safety factor is greater.
1. Before using the fume hood, check whether the power supply, water supply and drainage, gas and other switches and pipelines are normal;
2. Turn on the lighting equipment and check whether the visual light source and the inside of the cabinet are normal;
3. Turn on the exhaust fan, and within 3 minutes, listen to whether the operation is normal;
4. When the fume hood is checked in the above order, if there is any problem, please stop using it immediately and notify the maintenance unit to deal with it;
5. Before shutting down the fume hood, the exhaust fan should continue to run for a few minutes to completely remove the exhaust gas in the cabinet;
6. After using the fume hood, wipe clean the inside and outside of the cabinet, and close all switches and windows;
7. The laboratory should also be ventilated frequently when the fume hood is not used, which is beneficial to the health of the test personnel;
8. When the fume hood is in use, make up for 10 minutes every 2 hours (that is, open the window for ventilation) for more than 5 hours, open the windows to avoid negative pressure in the room;
9. It is forbidden to do experiments in the fume hood when the fume hood is not turned on;
10. It is forbidden to put your head into the fume hood to operate or check during the experiment;
11. It is forbidden to store or experiment with flammable and explosive materials in a fume hood;
12. It is forbidden to put the mobile power strip or wire in the fume hood;
13. It is forbidden to do experiments in the fume hood that mix organic substances and high-chlorine compounds prohibited by the state;
14. It is forbidden to place the tested substance in a fume hood for experiments without safety. Once the chemical substance is splashed out, the power supply should be cut off immediately;
15. When moving the upper and lower windows, operate slowly and gently to prevent the door handle from crushing your hands;
16. During the experiment, it is advisable to place the window 100-150 mm away from the table;
17. The operating area of the fume hood should be kept unobstructed, and no objects should be stacked around the fume hood;
18. When the operator is not using the fume hood, avoid storing too much test equipment or chemical substances on the ventilated countertop, and it is forbidden to stack it for a long time.