What are the precautions for using xenon light transfer Windows?

The use of xenon light transfer Windows should take into account both the disinfection effect and equipment maintenance while ensuring the safety of operators. The following are the key points to note during use, covering aspects such as operation norms, maintenance and care, and safety protection:
I. Preparation and Inspection before Operation
Confirmation of equipment status
Check whether the interlocking functions of the two doors of the transfer window are normal (make sure they cannot be opened simultaneously) to prevent direct air circulation between the clean area and the non-clean area.
Check if the xenon lamp is lit up normally. If it flickers, does not light up or the brightness is significantly reduced, the lamp tube needs to be replaced in time (the lifespan of xenon lamps is usually 5,000 to 8,000 hours, subject to the manufacturer's parameters).
If a fan and an air filtration system are equipped, check whether there is any abnormal noise from the fan operation and whether the differential pressure gauge reading of the high-efficiency filter (HEPA) is within the normal range (replacement is required if it exceeds the rated resistance).
Pre-treatment of items
The items to be transferred need to be surface-cleaned first to remove obvious dust, stains, or liquid residues, so as to avoid contaminants affecting the disinfection effect or damaging the equipment.
When placing items, ensure there is no overlap or obstruction to guarantee that the xenon light can evenly illuminate the surface. If necessary, use trays or racks to place them in layers.
Ii. Normative Requirements during the Operation Process
Disinfection time and dosage control
Set the disinfection time strictly by the equipment manual or verified parameters (commonly 3 to 10 minutes), and do not shorten it at will to avoid incomplete sterilization. For items with a high risk of microbial contamination (such as biological samples), the time can be appropriately extended, but it is necessary to pay attention to the impact of ultraviolet rays on some materials (such as plastic aging and rubber hardening).
If the transfer window is equipped with an ultraviolet intensity monitoring device, it needs to be calibrated regularly to ensure that the irradiation dose meets the requirements (such as ≥20000μW · s/cm²).
The usage rules of the door
Follow the principle of "close first, then open": Close the outer door immediately after putting in the items, and then open the inner door after disinfection is completed. After taking out the items, close the inner door in time and then open the outer door for the next transfer to avoid contamination of the clean area caused by keeping the door open for a long time.
It is strictly prohibited to forcibly open interlocked doors to avoid damaging the mechanical structure or electronic control system.
Airflow system operation
If the transfer window is equipped with a fan and positive pressure airflow function, the fan should be started before disinfection to create a positive pressure inside (usually maintained at 5-10Pa), reducing the infiltration of external contaminants. After the disinfection is completed, the fan can continue to operate for 30 seconds to 1 minute to blow away the particles on the surface of the items.
Iii. Safety Protection and Personnel Operation
Ultraviolet protection
When the xenon lamp is turned on, the operator should avoid looking directly at the lamp tube to prevent ultraviolet rays from burning the eyes (which may cause electric ophthalmia) or the skin (causing redness, swelling, and peeling).
When the transfer window is in operation, ensure that the observation window is made of UV-resistant material. If close operation is required, wear UV-resistant goggles and gloves.
Electrical safety
The equipment needs to be well grounded to avoid the risk of electric leakage. Regularly check if the power cord is damaged and if the control panel buttons are sensitive. Do not operate in a humid environment.
Special item transfer
When transferring flammable and explosive items (such as ethanol and acetone), it is necessary to ensure that the equipment has no potential hazards of electric sparks and avoid generating static electricity during the disinfection process. When transferring high-temperature items, it is necessary to confirm the temperature resistance of the box material (stainless steel can usually withstand temperatures above 100℃, but long-term high temperatures should be avoided to prevent the sealing parts from being affected).
Iv. Maintenance and Troubleshooting
Daily cleaning
Wipe the inner walls of the transfer window, door seals, and trays with a neutral cleaner (such as 75% alcohol) every day to remove surface dust and microbial residues. Avoid using strong acid or strong alkali cleaners to prevent corrosion of the stainless steel surface.
If stains (such as fingerprints or dust) are found on the surface of the lamp tube, they should be wiped with a clean soft cloth dipped in ethanol to ensure the ultraviolet transmission rate.
Regular maintenance
Check the aging condition of the door sealing rubber strips every quarter, replace the hardened or damaged rubber strips in time, and maintain the sealing performance of the box.
Annual leakage detection (such as the PAO test) should be conducted on the high-efficiency filter. If the filtration efficiency declines or it has been in use for more than 2-3 years (depending on the frequency of use), it needs to be replaced as a whole.
Record the usage time of xenon lamps and replace them in advance before reaching their service life cycle to avoid a decline in disinfection effect due to the attenuation of the lamp tubes.
Common Fault Handling
Door interlock failure: Check the door lock sensor or circuit connection. If it is a mechanical fault, contact the manufacturer for repair.
If the xenon lamp does not light up: First, check the power supply and switch. If they are normal, it may be that the lamp tube is damaged or the ballast is faulty. Professional personnel need to replace the parts.
Abnormal airflow: If the fan makes abnormal noises or the air volume decreases, it may be due to clogged filters or worn fan bearings. The filter needs to be cleaned or the fan replaced.
V. Environmental and Compliance Requirements
Installation environment
The transfer window should be installed in a flat and dry area to avoid severe vibration. The pressure difference between the clean area and the non-clean area on both sides should meet the design requirements (such as 10-15Pa) to ensure the correct direction of the airflow.
Verification and Recording
For new equipment or after major overhauls, disinfection effect verification (such as biological indicator testing) is required to confirm the inactivation rate of ultraviolet dose on target microorganisms (such as ≥6 log).
Each time it is used, the disinfection time, item type, operator, and other information should be recorded to facilitate traceability and quality control.
Summary
The correct use of xenon light transfer Windows should start from three aspects: operation norms, safety protection, and maintenance. It is necessary to ensure the effectiveness of ultraviolet disinfection while avoiding equipment failure and personnel injury. Regular inspection and record-keeping can help identify potential problems promptly, maintain the stable operation of equipment in a clean environment, and ultimately ensure the safety of transferred items and environmental compliance in the clean area.