What are the daily maintenance precautions for laminar flow transfer Windows?

The daily maintenance of laminar flow transfer Windows must strictly follow the cleanroom regulations and equipment operation requirements to ensure that the maintenance process does not affect the clean environment, guarantee personnel safety, and maintain the stable performance of the equipment. The following is a detailed description of the key precautions:
I. Safety Operation Specifications
1. Power failure and warning
Before maintenance: The power supply of the equipment must be cut off first (such as turning off the main switch or unplugging the plug), and a "Do Not Close the Switch" warning sign must be hung at the power source to prevent others from making mistakes and causing electric shock or mechanical injury due to sudden startup of the equipment.
Live working restrictions: Only professional electricians are allowed to conduct live testing when necessary (such as circuit connection and disconnection tests), and they must wear insulating gloves and use insulating tools. The one-handed operation should be avoided to prevent electric shock.
2. Protection of mechanical components
Fan maintenance: Before disassembling the fan impeller or air duct, it is necessary to ensure that the impeller has completely stopped rotating. You can manually rotate the impeller to confirm that there is no jamming or lag before operation, and avoid getting your fingers caught in the rotating parts.
Door body operation: When repairing the hinges and door locks of the door body, it is necessary to fix the door body with supports (such as wooden wedges) to prevent the door body from suddenly closing and pinching your hand or getting injured.
Ii. Maintenance of a Clean Environment
1. Personnel dress code requirements
Entering the clean area for maintenance: Maintenance personnel must wear clean suits, shoe covers, masks, and gloves (head covers if necessary) to prevent human hair, dander, or clothing fibers from contaminating the interior of the transfer window and the clean room environment.
Tool cleaning: The tools used (such as screwdrivers and wrenches) should be wiped and disinfected with 75% alcohol in advance, or special dust-free tools should be used to prevent the tools from carrying dust or contaminants.
2. Dust prevention during the maintenance process
Disassembly component handling: When cleaning or replacing components such as filters and fans, operations must be carried out in the designated area outside the clean zone to prevent accumulated dust from falling into the transfer window during the disassembly process.
Opening sealing: If it is necessary to open the side panels or top inspection openings of the box, during maintenance, the openings should be covered with clean plastic sheeting or dust covers to reduce the entry of external dust.
Garbage disposal: Waste generated during maintenance (such as old filters and damaged sealing strips) must be placed in sealed plastic bags and promptly removed from the clean area. It is strictly prohibited to discard it on-site.
3. Key points for filter replacement
High-efficiency filter protection: When handling high-efficiency filters, hold them horizontally to avoid severe vibration or collision and prevent damage to the filter material. Before installation, it is necessary to check whether the sealing rubber strip is complete. After installation, it is necessary to ensure that the frame is closely attached to the box without any gap.
Leak detection test: After replacing the high-efficiency filter, a particle counter or smoke leak detector must be used for leakage detection. Focus on checking the sealing area of the frame and the surface of the filter material. If leakage is found, the filter needs to be reinstalled or replaced.
Iii. Accessories and Tools Management
1. Accessory compatibility
Filter model matching: When replacing the primary and high-efficiency filters, it is necessary to confirm that the size and filtration efficiency grade (such as H13, H14) of the new accessories are consistent with those of the original equipment to avoid abnormal airflow parameters or sealing problems caused by non-compliance with specifications.
Electrical component standards: When replacing electrical components such as switches and relays, products that meet the explosion-proof and fireproof requirements of the clean room (such as sealed components) must be selected to prevent risks or environmental pollution caused by electric sparks.
2. Tool and Consumables Management
Specialized tool identification: Maintenance tools for the clean area should be stored separately and managed by designated personnel. They should also be marked with "Specialized for Clean Area" to prevent contamination caused by mixing with ordinary tools.
Grease selection: When adding grease to the bearings, door shafts, and other parts of the fan, food-grade or medical-grade grease (such as silicon-based grease) should be used to prevent the evaporation of ordinary grease from generating particles or odors and polluting the clean environment.
Iv. Record and Traceability Management
Maintain record archiving
For each maintenance and repair, the ** "Equipment Maintenance Record Form" ** needs to be filled in detail. The contents include:
Date, name of the maintenance personnel;
Maintenance items (such as replacing filters, and tightening circuits);
The model, batch number, and validity period of the replaced parts;
Inspection results after maintenance (such as wind speed values, and pressure difference data);
Description of abnormal situations and handling results.
Records should be properly kept for at least three years to facilitate the traceability of equipment operation status, the prediction of parts replacement cycle, and the response to compliance inspections such as GMP.
2. Trend analysis and prediction
By long-term recording and analyzing the operation data of the equipment (such as the frequency of filter replacement and changes in fan noise), potential problems can be identified in advance. For example:
If the cleaning frequency of the primary filter increases significantly, it may indicate an increase in the environmental dust concentration, and the sealing performance of the upstream clean room needs to be checked.
If the pressure difference of the high-efficiency filter rises at an accelerated rate, it may indicate air leakage in the box or a decline in the performance of the fan. Timely investigation is necessary.
V. Professional Operation Boundaries
1. Situations where unauthorized handling is prohibited
The following complex maintenance should be carried out by contacting the equipment manufacturer or a professional clean equipment service provider. Do not operate it by yourself:
Control system failures: such as abnormal PLC programs, malfunctioning touch screens, and failure of the automatic wind speed adjustment function;
Fan motor burnout or severe bearing wear: Involving professional electrical operations such as motor disassembly and winding replacement;
Box structure modification: such as expanding inspection openings, replacing sealing materials, and other changes that affect equipment performance;
Excessive cleanliness and unknown cause: If the air velocity still fails to meet the standard after multiple filter replacements, it may involve design flaws in the air duct.
2. Training and Qualification Requirements
Ordinary operators can only perform basic maintenance such as surface cleaning, cleaning of primary filters, and simple screw tightening.
Maintenance personnel involved in electrical systems, filter replacement, and performance testing must have received training from the manufacturer or possess qualifications for clean equipment maintenance to prevent equipment damage or clean room contamination due to improper operation.
Vi. Principles of Emergency Response
Emergency response to faults: If during the maintenance process, it is found that the equipment cannot operate normally (such as the fan stopping or the door body being unable to close), a "Fault Out of Service" sign must be hung immediately, and the cleanroom management personnel should be informed to suspend its use until the fault is eliminated and re-tested as qualified.
Pollution spread prevention: In case of pollution incidents such as filter damage or lubricating oil leakage during maintenance, immediately use a lint-free cloth to absorb the contaminants and wipe clean with alcohol. If necessary, disinfect the interior of the transfer window with ozone or expose it to ultraviolet light to ensure environmental safety.
By strictly adhering to the above precautions, the impact of the maintenance process on the clean environment can be minimized to the greatest extent, ensuring the stability and reliability of the laminar flow transfer window, and at the same time avoiding safety accidents or compliance risks caused by improper operation.