The method for judging the normal state of the differential pressure gauge of the air shower transfer window The differential pressure gauge of the air shower transfer window is mainly used to monitor the resistance changes of the high-efficiency filter. Whether its reading is normal directly affects the purification effect of the air shower system and the operating status of the equipment. The following judgment methods are explained step by step and are applicable to on-site operation, maintenance and training scenarios. I. Prerequisite: Confirm that the foundation condition of the differential pressure gauge is normal Appearance and installation inspection The dial is undamaged, the scales are clear, and the hands are not stuck. Correct installation position: It should be installed vertically at an easily observable position outside the transfer window. The pressure guiding pipe should be firmly connected without any bends or air leaks. The interface of the pressure guiding pipe should be free from dust and oil stains. The positive pressure end should be connected upstream of the high-efficiency filter, and the negative pressure end should be connected downstream (or connected as indicated in the equipment manual). Zero position calibration verification When the equipment is completely powered off and

I. Standard Operating Procedures 1. Preparations before operation Check the appearance of the equipment: no damage, the door body closes tightly, and the indicator light of the interlock device is normal. Function check: Turn on the power, confirm that the fan starts up, the air outlet of the air shower nozzle is normal, and the differential pressure gauge shows within the qualified range (usually ≥10Pa). Environmental confirmation: Personnel in the clean area and non-clean area on both sides of the transfer window have all taken clean protective measures, and the surface of the items to be transferred is clean. 2. Item transfer process Operations on the non-clean area side Open the side door of the non-clean area (the side door of the clean area will automatically lock and the interlock will take effect). Place the items on the storage platform inside the transfer window to ensure that they do not block the nozzles or clog the return air passage. Close the side door of the non-clean area. Once the door is in place, the air shower system will start automatically (or manually press the “Air Shower Start” button). Air shower process The air shower time is set at 10 to

I. Core Clean Industry Scenarios Electronic semiconductor industry: Production workshops and warehousing logistics areas for precision components such as wafers, PCB boards, and chips (fast passage + dust removal and anti-static to avoid particle contamination); Pharmaceutical and biological industry: Pharmaceutical production workshops (API raw materials, finished preparations), medical device workshops, biological laboratories (high aseptic requirements, well-sealed winding doors to reduce cross-contamination); Food and beverage industry: Aseptic food processing area, health product workshop, beverage filling line (dust removal before raw material entry and finished product exit, in compliance with GMP hygiene standards); Precision manufacturing industry: Optical instrument, precision machinery, automotive electronic parts workshops (frequent turnover of goods, quick opening and closing of winding doors, no impact on production efficiency); Cosmetics/daily chemical industry: Aseptic cosmetics production lines, skin care product filling workshops (to avoid dust and microbial contamination and ensure product cleanliness). Ii. Logistics and Warehousing Scenarios Clean area logistics transition: Goods channels between clean warehouses and non-clean areas, automated logistics lines (with AGV carts), cold chain clean areas (with good insulation of winding doors for rapid isolation); E-commerce/cold chain logistics: High-cleanliness e-commerce warehouses (such as medical consumables, precision parts), cold chain food turnover areas (reducing temperature loss + dust removal). Iii.

The cleanliness grade classification of the rapid winding type cargo air shower is mainly based on the particulate matter control standards that the goods meet after air shower, and at the same time matches the grade requirements of the clean area they are connected to. The common classification system refers to the ISO 14644-1 international standard and the domestic GB 50073 specification. The specific classification is as follows: I. Core Classification Basis Particle size: Focus on two key particle sizes of 0.5μm and 5μm (core control indicators for clean environment); Particulate matter concentration limit: The maximum number of particles allowed in a unit volume of air. Air shower effect: Nozzle air velocity ≥25m/s, air shower time adjustable from 10 to 30 seconds, ensuring that the removal rate of adhering particles on the surface of goods is ≥95%. Ii. Common Cleanliness Grades and Applicable Matching Cleanliness grade (ISO 14644-1) Core control indicator (particle count /m³) The scenarios suitable for the air shower room ISO Level 5 (formerly Level 100) 0.5μm particles ≤3520; 5μm particles ≤29 Electronic semiconductor wafer workshop, biosafety level 1 laboratory, sterile production area for high-end medical devices ISO Level 6 (formerly Level 1000) 0.5μm particles ≤ 35,200; 5μm

Daily Operation and Maintenance Manual for Automatic Double-Opening Air Shower I. Daily Operation Specifications (Implemented Daily) Check before startup Confirm that the power supply and compressed air are normal (air pressure 0.4-0.6MPa); Check the door body’s sensing sensitivity and interlocking function (both doors cannot be opened simultaneously). Observe that there is no abnormal noise during the operation of the fan and the air output from the nozzles is uniform. Use the operation process The goods are pushed into the material shower room. After the sensor door closes automatically, the shower starts (the duration can be adjusted from 10 to 30 seconds). The goods should be placed evenly to avoid blocking the nozzles and sensing probes. After the sprinkler is over, unlock the other side door before pushing out the goods. It is strictly prohibited to force the door open. In-operation monitoring Observe the operation status of the equipment in real time. If there is a door jamming or spray fault, stop the machine immediately for inspection. Record the operation duration and the number of faults to form a daily operation ledger. Ii. Key Points of Daily Maintenance (Executed Weekly) Cleaning and maintenance Wipe the interior of the box, the glass

I. Door body malfunction The sensor door cannot open automatically Troubleshooting steps Check whether the induction probe is blocked by goods, dust, or the probe wiring is loose. Verify whether the double-door interlock function is triggered (when one side door is not fully closed, the other side door cannot be unlocked); Confirm whether the compressed air pressure is within the range of 0.4-0.6MPa (the pneumatic door needs sufficient air pressure to drive). Check whether the fuse in the control circuit has blown or whether the contactor is faulty. Solution Clean the dust on the surface of the probe and re-fix the loose wiring. Make sure that both door bodies are completely closed and the interlocking state is released. Adjust the pressure of the air compressor to the standard range, inspect and repair the leakage points in the air pipe. Replace the blown fuse, repair or replace the faulty contactor. 2. The door does not close tightly or gets stuck Troubleshooting steps Check whether there are any foreign objects blocking the door body guide rails or if the guide rails are deformed. Check whether the sealing strip is damaged, fallen off, or the door hinge is loose. Test whether the thrust

The overall general service life of the DOP laminar flow transfer window (laminar flow transfer window with DOP detection port) is 5 to 10 years. With high-quality materials and standardized maintenance, it can be extended to more than 10 years. The following are explanations by dimensions: I. Overall Lifespan and Key Influencing Factors Influencing factors Explanation The impact on lifespan Material and manufacturing process High-quality 304/316 stainless steel main body, precisely manufactured The main framework can last for more than 10 years Usage frequency and environment High cleanliness, low dust environment, and reasonable usage intensity Extend service life and reduce component wear and tear Maintenance and upkeep level Regular cleaning, replacement of consumables, and standardized maintenance for leak detection and testing can extend the service life A service life of 3 to 5 years Ii. Core Component Replacement Cycle (Parallel to Overall Lifespan) Component Replacement cycle Explanation High-efficiency Filter (HEPA 6 to 12 months The differential pressure gauge should be replaced in a timely manner when its reading drops significantly Sealing strip 1 to 2 years Replace immediately when aging or damage is found Ultraviolet lamp tube About 5,000 hours Places with high biosafety requirements need to be replaced regularly

The core basis for determining whether the high-efficiency filter (HEPA) of the DOP laminar flow transfer window needs to be replaced is the pressure difference change, performance test results, and actual usage status. Specifically, it can be comprehensively judged through the following dimensions: I. Core Judgment Basis: Differential Pressure Monitoring (the most direct indicator) The resistance of high-efficiency filters will increase as the amount of dust accumulated. The differential pressure gauge (or pressure gauge) that comes with the transfer window is a key monitoring tool. Initial pressure difference record: After the new filter is installed, the initial pressure difference at the rated air volume (usually the “initial resistance” of the high-efficiency filter, approximately 200-250Pa) should be recorded as the reference value. Final resistance triggers replacement: When the operating pressure difference displayed by the differential pressure gauge reaches twice the initial resistance (400-500Pa), it indicates that the filter is saturated with dust and must be replaced. In some high-demand scenarios (such as GMP workshops in the pharmaceutical industry), the final resistance threshold is set at 1.5 times the initial resistance, and industry standards must be followed. Abnormal pressure difference investigation: If the pressure difference suddenly drops significantly (far below the initial

The automatic double-opening goods air shower, as a key purification device between the clean area and the non-clean area, removes dust particles adhering to the surface of goods through high-speed air flow sweeping, preventing contaminants from entering the clean environment. It is widely used in industries such as medicine, electronics, food, and precision manufacturing. The daily application and maintenance of science can not only ensure its purification effect, but also extend the service life of the equipment and reduce the failure rate. I. Daily Application Norms 1. Requirements for operation procedures Before the goods enter: Make sure that the doors on both sides of the goods shower room are closed, and check whether the fan, nozzle, lighting and interlock device are normal (no fault indication on the indicator light). The goods should be placed stably to avoid blocking the nozzles or obstructing the channels. The height and width should not exceed the rated size of the goods shower room (usually a 10cm allowance should be reserved). During operation: After the goods are pushed in, the entrance door is closed, and the system automatically triggers the purging program (the conventional purging time is 15-30 seconds, which can be set as needed).

The cleaning cycle of the automatic double-opening air shower should be classified based on the type of components, the dust concentration in the usage environment, and the operating frequency of the equipment. The core cleaning/maintenance cycle is as follows: 1. Internal cleaning (wall panels, floor, nozzles Basic cycle: Clean after daily use (wipe with a lint-free cloth to remove surface dust and debris); Enhanced cleaning: Deep wiping every week (targeting dead corners such as nozzle gaps and grooves of door body sealing strips); Special scenarios: If it is applied in industries with a large amount of dust (such as building materials, metal processing) or used more than 10 times a day, it should be changed to cleaning per shift (once in the morning and once in the evening). 2. Pre-filter (Primary filter) Cleaning cycle: Once a week (blow with compressed air or rinse with clean water, dry and reinstall); Replacement threshold: When the number of water washes reaches 3 times or the pressure difference is ≥200Pa, replace directly (no further cleaning is required). Special scenarios: In high-dust environments, reduce the purging to once every three days. Replace in a timely manner when the pressure difference rises rapidly. 3. High-efficiency filter

The core working principle of the automatic winding filter device is to achieve continuous and uninterrupted air filtration through the automatic winding and replacement of filter materials, and to complete automated operation and maintenance in combination with differential pressure feedback control. The specific disassembly is as follows: 1. Basic filtration mechanism (consistent with conventional air filters) When dusty air passes through the air inlet side of the device, the airflow passes through the filter material (usually non-woven fabric, glass fiber mat and other primary/medium efficiency filter materials). Dust particles are intercepted by the fibers of the filter material (interception mechanisms include: inertial collision, diffusion effect, direct interception, electrostatic adsorption, etc.). The filtered clean air is discharged from the air outlet side, completing the basic gas-solid separation. 2. Core automated winding drive system The device is equipped with a built-in drum-type filter material assembly: The filter material is pre-wound on the “original drum” at the top of the device, and a “waste drum” is set at the bottom. One end of the filter material is fixed on the waste drum. When dust accumulates on the surface of the filter material, the filtration resistance gradually increases, and the differential pressure sensor of

The advantages and disadvantages of the dynamic winding type filtration device need to be analyzed in combination with its core design (automatic winding, continuous filtration) and actual application scenarios. The following is a clear summary: I. Core Advantages It enables continuous and uninterrupted filtration without the need to stop the machine to replace filter materials. The automatic winding mechanism completes the filter material update during the filtration process. It is particularly suitable for scenarios such as chemical engineering, coating, and data centers that require 24-hour continuous operation, avoiding production interruption or equipment failure caused by stopping the machine to replace filter materials. Significantly reduce manual operation and maintenance costs by replacing the traditional manual inspection, replacement, and disassembly processes of filters. Only the filter material rolls need to be replaced as a whole at regular intervals (the frequency is much lower than that of a single filter material replacement), reducing human input. It is especially suitable for working conditions with high dust concentration and fast filter material consumption (such as metallurgical and cement workshops). The filtration efficiency is stable and controllable. The pressure difference is taken as the core trigger condition for filter material replacement, avoiding the subjectivity of manual