What should I pay attention to when using a fume hood?

The following points should be paid attention to under the correct use of the fume hood: 1. When the fume hood is in use, make up air for 10 minutes every 2 hours (that is, open the window for ventilation); If the use time is more than 5 hours, open the window and pay attention to avoid negative pressure in the room. 2. The laboratory should also be ventilated from time to time when the fume hood is not in use, which is beneficial to the health of the test personnel; 3. When more than 2 fume hoods use 1 fan, in order to avoid operation errors or impropriety, the "on" and "off" of the fan can only be controlled by 1 operator; If another fume hood is not in use or is to be discontinued, an air volume control valve can be used to close the vent; Avoid repeating "on" and "off" the fan repeatedly, which not only damages the life of the fan, but also makes the experiment inaccurate.

4. When the fume hood is in use, avoid the interference of the countercurrent wind direction caused by the movement of personnel to the fume hood; 5. The indoor air temperature is between -5 and +40, and the average value for 24 hours does not exceed +25;

1. Before using the fume hood, you must check whether the power supply voltage is in accordance with the regulations of the fume hood, and regularly check the exhaust motor. If you are sure that it is correct, turn on the exhaust fan before you can carry out laboratory work in the cabinet.

2. When using the fume hood, it must be operated on the working surface, and do not do dangerous and toxic experiments outside the cabinet, so as to avoid toxic gases volatilizing into the room and endangering the safety of the staff.

3. When using the electric stove in the fume hood, it is recommended to pad asbestos pads or heat insulation boards under the electric stove. When operating the experiment, do not use your head, hands and other parts of your body, or even other hard objects to hit the glass movable panel. When doing low and splash experiments, the movable panel of the fume hood glass must be closed, and it is strictly forbidden to carry out strong experiments in the cabinet to ensure the safety of the operator.

4. After the experimental operation is completed, the exhaust fan should continue to run for about 1-2 minutes to ensure that all the toxic gases and residual exhaust gases in the cabinet are discharged. Turn off all power and clean the fume hood to remove any debris and solution left on the countertop or side panels, and do not clean it when the electricity is live or the motor is running.

The above are the points that we should pay attention to when using a fume hood.

1. Before using the all-steel 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 source and the inside of the cabinet are normal.

3. Turn on the exhaust fan and listen to whether the operation is normal within about 3 minutes.

4. When the all-steel fume hood is inspected in the above order, if there is any problem, please suspend the use immediately and notify the maintenance unit to deal with it.

5. Before the all-steel fume hood is shut down, the exhaust fan should continue to run for a few minutes to completely eliminate the exhaust gas in the cabinet.

6. After the fume hood is used, wipe the inside and outside of the cabinet clean, and close the 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 experimenters.

8. When the fume hood is in use, 10 minutes of air supply (i.e., open the window for ventilation) every 2 hours If the use time exceeds 5 hours, the window should be opened to avoid negative pressure in the room.

9. It is forbidden to do experiments in the fume hood when the fume hood is not opened.

10. It is forbidden to put your head into the fume hood to operate or check when doing experiments.

11. It is forbidden to store or experiment with flammable and explosive materials in the fume hood.

12. It is forbidden to place the mobile plug-in strip or wire in the fume hood.

13. It is forbidden to do experiments on the mixing of organic substances prohibited by the state and high-chlorine compounds in the all-steel fume hood.

14. It is forbidden to place the tested substance in the fume hood for experiments without safety, and once the chemical substance is splashed out, the power supply should be cut off immediately.

15. When moving the upper and lower windows, it is necessary to operate slowly and gently, so as not to crush the hand with the door handle.

16. During the experiment, it is advisable to keep the window 100-150 mm away from the table.

17. The operation area of the all-steel fume hood should be kept unblocked, and items should be avoided around the fume hood.

18. When the operator does not use the fume hood, the all-steel ventilated counter should avoid storing too much experimental equipment or chemicals, and it is forbidden to stack it for a long time.

When ventilating, we must pay attention to some of these cabinets, and when using them, they must not affect other people and other customers.

In the process of use, attention should be paid to try to be as low-key as possible, and it is safest and most effective to use in a ventilated place.

Here's how to use a fume hood:

1. The fully open state of the glass window is only allowed to appear when assembling and debugging internal instruments and equipment or cleaning the blind space in the cabinet, which is the "debugging state".

2. The glass window is opened to the user's elbow, so that the operator's hand can reach into the cabinet to operate the experiment, and the chest above is protected by the glass window safety tempered glass, which is the "normal operation state".

3. Adjust the door to open to the lowest opening, and the operator leaves, so that the experimental program in the cabinet reacts or pauses the experiment by itself, which is the "standby state".

4. When the experimenter is in the fume hood experiment, he should avoid sticking his head into the adjustment door to avoid danger.

5. Avoid placing too many non-essential items and equipment in the fume hood, so as not to interfere with the normal flow of air and cause disturbance (turbulence).

6. When the experimental items and equipment are placed in the fume hood, they should be about 150mm away from the inside of the adjustment door to ensure smooth exhaust.

7. Before finishing the work and leaving the fume hood, the operator should turn off the power supply of the equipment in the fume hood, turn off all the water, electricity and gas switches, and reduce the adjustment door to the lowest position before leaving.

8. Although the fume hood is made of polymer corrosion-resistant materials, proper cleaning and maintenance is necessary to prolong the service life of the silver chain. If there are reagents and drugs splashed during ordinary use, they should be wiped and removed immediately, and the inside should be wiped clean with clean water before stopping work every day and leaving, and the deflector should be removed for cleaning and inspection at least once every three months. God and not.

1. Strong electrical insulation performance, strong corrosion resistance and excellent heat resistance. The whole inner hollow has no dead ends, and has the functions of high strength, light weight, corrosion resistance and heat resistance (100-300;

2. The top light pipe and bracket are equipped with a glass fiber reinforced plastic lampshade, and the bottom is equipped with a 5 cm tempered clear glass, which plays the role of protecting the light pipe and the bracket

3. The design of the deflector plate can make the harmful gases with different specific gravity generated in the experiment be discharged according to different discharge channels, eliminate the exhaust dead angle, avoid the negative pressure in the cabinet or the vortex of harmful gases, and provide a safe laboratory;

4. The surface and inner plane of the appearance are smooth and flat, unobstructed, easy to handle and easy to clean.

5. Overall: Strong corrosion resistance, FRP has a wide range of corrosion resistance, it is suitable for acid and alkali gases, toxic and harmful gases and organic solvent gases.

6. Countertop: thick core physical and chemical board, acid and alkali resistance, moisture resistance, impact resistance.

7. Door frame: safety tempered glass, stepless balanced lifting, up and down, left and right push and pull can stay in any position.

8. Lighting: anti-corrosion fluorescent lamp, the light source is isolated from the gas inside and outside, and the fluorescent lamp (equipped with tempered glass and corrosion-resistant FRP lampshade on the top).

9. Control circuit board: light switch, fan on off switch, damper adjustable, and time and date display, three 220V 10A-16A multi-function sockets.

10. Aging resistance, long life, and can be renewed.

As an important ventilation equipment in the laboratory, the fume hood plays an irreplaceable role in the laboratory, through the exhaust air supply system.

Create a good experimental environment for Minzu to protect technicians from toxic and harmful gases. For such important ventilation equipment as fume hoods, laboratory staff must use and maintain them correctly to prevent damage.

1. Minimize air interference: Airflow interference in the laboratory will reduce the ventilation and exhaust efficiency of the fume hood. Therefore, the fume hood should be placed in the correct and reasonable position to maximize efficiency, and it is recommended to place it in a position that can avoid cross-drafting, and it is reasonable to place it according to the laboratory space.

2. Ensure normal exhaust: The staff should check whether the exhaust ventilation function of the fume hood is normal before the formal start of work in the fume hood, and then start running the fume hood after ensuring that it is correct.

The wind speed is m s when toxic and harmful pollutants are produced in the experiment, the wind speed is m s when the experiment produces highly toxic or a small amount of radioactivity, and the wind speed is 1m s when the gas is produced in the experiment, and the particle is 1m s.

3. Correct operation: jujube slippery fume hood.

There are many types or special customizations, and the products have different functions, and to get the most out of the fume hood, following the correct operating procedures is key. Each type of fume hood has a set of relevant instructions and procedures, so staff should read the instructions carefully before using them to operate and use them correctly.

4. Maintenance and maintenance: As a kind of precision experimental equipment, the fume hood should be arranged to inspect and calibrate its components and various performances, and if it is found that the parts are damaged and aging, they should be replaced in time, and if the failure occurs, it should be reported in time and contact the manufacturer for maintenance.

In the chemical laboratory, various harmful gases, odors, moisture and flammable, explosive and corrosive substances are produced during the experimental operation. To protect the safety of users and prevent contaminants from experiments from spreading to the lab, fume hoods should be used close to the source of contamination. Fume hoods are an essential type of laboratory furniture.

It plays a role in ventilation in the laboratory.

1.Before using the power supply, the fume hood should be checked to see if the water, gas pipes and various switches are normal;

2.Turn on the lighting system equipment and check whether the visual source and the internal control of the cabinet can be normal;

3.The operation of the heater is normal after turning on the fan for about 3 minutes;

4.Check the fume hood according to the above sequence, and if the problem requires immediate stop operation and notify the maintenance treatment;

5.Before the fume hood is shut down, the exhaust fan should continue to run for a few minutes, so that the exhaust gas in the cabinet can be completely not eliminated;

6。After the fume hood is used, clean the fume hood in time.

7.In the laboratory, the fume hood is often opened when not in use, which can protect the entire laboratory air environment.

8.When the fume hood is in use, 10 minutes of supplemental air (i.e., open the window for natural ventilation) every 2 hours If the use time can exceed 5 hours, a window should be opened to avoid negative pressure due to the interior design;

9.When the fume hood is not opened, it is forbidden to experiment in the fume hood;

10.When the experiment is forbidden head into the fume hood for operation or view;

11.It is forbidden to store or experiment with flammable and explosive materials in the ventilation control cabinet;

12.It is forbidden to place moving wires or wires in the fume hood;

13.It is forbidden for the state to prohibit the discharge of fibers and hidden electricity experiments with high chlorinated substances mixed with organic substances in fume hoods;

14.It is forbidden to place the tested substances in the fume hood for experiments without safety, and once some chemical research substances are splashed out of the enterprise, the power supply should be cut off immediately through the hall;

15.Move the upper and lower windows slowly and gently to avoid crushing the handles;

16.During the experiment, appropriate windows are 100-150 mm away from the table;

17.The operation area of the fume hood should be kept unblocked, and the materials can be stacked around the fume hood;

18.When the fume hood is not used by the operator, avoid storing too much test equipment or chemicals on the ventilated countertop, and prohibit long-term stacking.

Risestar Laboratory System Equipment (Suzhou)****.

Take the town as follows:1. Exhaust fume hood.

After circulating in the cabinet through the indoor air intake, it is called full exhaust type, which is a type that is very widely used.

2. Make-up fume hood.

When the fume hood is set up in a room that requires heating or temperature and humidity control, in order to save heating and air conditioning energy consumption, the method of taking the supply air from the outside and circulating it in the cabinet and discharging it outside is called the make-up fume hood.

3. Variable air volume fume hood.

The ordinary constant air volume system needs to manually adjust the air valve with fixed blades, adjust the exhaust air volume of the fume hood, and achieve the desired ground wind hand sensitivity speed when adjusting the valve to a certain angle. Variable air volume control is to change the air volume to achieve a given surface wind speed by adjusting the sensor of the valve, of course, the standard type has low cost and high variable air volume cost, and is suitable for occasions that require high accuracy.

What are the precautions for the use of fume hoods? Why.

What are the precautions for the use of fume hoods? Why: Precautions for use of fume hoods:

1.Before using the fume hood, turn on the exhaust air before operating in the fume hood. 2.

When operating reagents with strong acids, strong alkalis and volatile harmful gases, it is necessary to pull down the movable baffle of the fume hood glass for operation. It is strictly forbidden to conduct ** sex experiments in the fume hood, and pay attention to protecting your own safety. 3. When operating the experiment, do not use your head, hands and other parts of the body, or other hard objects to collide with the glass movable baffle.

4.When using a fume hood, it must be operated at the worktop in the fume hood. Do not conduct dangerous and harmful poison experiments outside the fume hood, so as to avoid toxic gases emitting to other working areas of the laboratory and causing health harm to other staff.

5.When using heating equipment in a fume hood, it is recommended to place an asbestos mat or heat shield underneath the equipment. Calendar do 6

After the experimental operation is completed, Wang Heng should immediately turn off the exhaust. Exhaust should continue for 1-2 minutes to ensure that all harmful gases and residual exhaust gases in the fume hood are discharged. 7.

When the experiment is complete, turn off all power and clean the fume hood. Remove debris and residual solution from the fume hood. Do not clean up when the motor is live or running.

8.No flammable or explosive materials shall be placed in the ventilation tomb.