What are the replacement and maintenance methods for the lighting fixtures of fume hoods?

Replacement method

Preparatory work

Power-off operation: To ensure safety, the power supply of the fume hood must be turned off before replacing the lamps. The power control switch of the fume hood can be found and turned off, or the main power switch of the entire laboratory can be turned off.

Prepare tools: According to the type and installation method of the lamp, prepare the corresponding tools, such as screwdrivers (flat-head or cross-head), wrenches, insulating tape, etc.

Disassemble the old lamps

Determine the fixing method of the lamps: Observe the fixing structure of the lamps. Some lamps may be fixed to the top or side of the fume hood with screws, while others may be installed in a snap-on manner.

Removing screws: If the lamp is fixed with screws, use an appropriate screwdriver to rotate the screws counterclockwise to unscrew all of them. Be sure to keep the screws well for use when installing a new lamp.

Unfasten the buckle: For button-type lamps, gently press the buckle or follow a specific operation method to remove the lamp from its installation position. During the operation, be careful to avoid excessive force that may damage the installation parts of the lamps or fume hoods.

Disconnect the power connection: After removing the lamp, find the connection wire between the lamp and the power supply, and loosen the connection wire with a screwdriver or other tools. If the connecting wire is wrapped with insulating tape, carefully tear off the insulating tape first, and then perform the disconnection operation. When disconnecting, be sure to remember the connection position of each wire to ensure correct connection when installing new lamps.

Install new lamps

Connect the power cord: Connect the power cord of the new lamp to that of the fume hood in the way you remembered before. If the colors of the connecting wires are different, the principle of "live wire to live wire, neutral wire to neutral wire, and ground wire to ground wire" is generally followed. After the connection is completed, wrap the connection with insulating tape to ensure a firm connection and good insulation.

Fixed lighting fixtures: Install the new lighting fixtures at the installation positions of the fume hood. If it is fixed with screws, align the screws with the installation holes and tighten them clockwise with a screwdriver. If it is a snap-fit installation, align the lamp with the snap-fit position, gently press it or follow the specific operation method to fix it firmly.

Check the installation: After the installation is completed, carefully inspect whether the lamp is firmly installed, whether the power cord connection is correct, and whether the insulation is good. Gently shake the lamp to make sure it doesn't loosen.

Power-on test

Turn on the power of the fume hood and check whether the lamp can light up normally. If the lamp doesn't light up, first check whether the power connection is correct and whether there is any loosening or poor contact. Check again whether the lamp itself is damaged, such as whether the bulb is burned out, etc.

Maintenance method

Daily cleaning

Cleaning frequency: Clean the surface of the lamps at least once a week.

Cleaning method: Use a clean damp cloth to gently wipe the surface of the lamp to remove dust and stains. For some hard-to-clean areas, such as the gaps in lamps or heat dissipation holes, a small brush or cotton swab can be used for cleaning. Be careful not to directly rinse the lamps with overly damp cloths or water to avoid damaging the electrical components of the lamps.

Check the status of the lamps

Inspection frequency: Check the working condition of the lamps once a month.

Inspection content: Observe the lighting condition of the lamps to see if there is any flickering, uneven brightness or local non-lighting. Check whether the fixed parts of the lamp are loose and whether the power cord is damaged or aged. If abnormal lighting is detected in the lamp, it might be due to the expiration of the bulb's lifespan or a circuit failure. In such cases, the bulb needs to be replaced or repaired promptly. If any damage to the power cord is found, stop using it immediately and replace it with a new one.

Change the light bulb

Bulb selection: Choose the appropriate bulb based on the specifications and requirements of the lamp. Note that the parameters such as the power, voltage and interface type of the bulb should match those of the lamp.

Replacement steps: First, turn off the power and wait for the bulb to cool down before replacing it. Some lamps' bulbs can be unscrewed directly, while others may require opening the lamp's casing first before replacement. When replacing a light bulb, operate carefully to avoid damaging the bulb or other components of the lamp. After the replacement is completed, power on the lamp again to check if it can light up normally.

Heat dissipation maintenance

Ensure good ventilation: The lamps of the fume hood will generate a certain amount of heat when in operation. It is necessary to ensure that there is a good ventilation environment around the fume hood to allow the lamps to dissipate heat. Do not stack any miscellaneous items around the fume hood to affect air circulation.

Clean the heat dissipation components: Regularly clean the heat dissipation components of the lamps, such as heat sinks and heat dissipation holes. You can use a vacuum cleaner or a small brush to remove dust and debris from the heat dissipation components to ensure the heat dissipation effect. If the heat dissipation components are clogged with dust, it will cause the lamp to overheat, affecting the lifespan of the bulb and the safety of the lamp's use.