As an air shower supplier, I understand the importance of ensuring that air showers perform optimally. Air showers are critical components in maintaining cleanroom environments, preventing contamination from entering sensitive areas in industries such as pharmaceuticals, electronics manufacturing, and food processing. In this blog post, I will share some key methods to check the performance of an air shower. Air Shower
Air Velocity Measurement
Air velocity is one of the most crucial parameters when it comes to the performance of an air shower. The high – velocity air jets in an air shower are designed to remove particles from personnel and equipment surfaces. To measure the air velocity, we can use an anemometer.
First, it is important to select the right type of anemometer. Hot – wire anemometers are commonly used for measuring air velocity in air showers due to their high accuracy and fast response time. Place the anemometer at different positions within the air shower, especially at the nozzles. The recommended air velocity at the nozzle should typically be between 20 – 25 m/s. This velocity is sufficient to dislodge particles from the surface of the objects passing through the air shower.
Take multiple readings at various locations and heights within the air shower. Record these readings and calculate the average air velocity. If the measured air velocity is significantly lower than the recommended range, it could indicate a problem with the fan, clogged filters, or a malfunction in the air distribution system. For example, if the filters are dirty, the airflow resistance increases, which in turn reduces the air velocity.
Particle Counting
Particle counting is another essential method to evaluate the performance of an air shower. A particle counter is used to measure the number of particles of different sizes in the air. Before starting the air shower operation, take an initial particle count in the area outside the air shower and inside the cleanroom.
Then, have a test subject or a test object pass through the air shower. After the air shower cycle is complete, take another particle count in the cleanroom area adjacent to the air shower exit. Compare the particle counts before and after the air shower operation. A significant reduction in particle count indicates that the air shower is effectively removing particles.
The acceptable particle count levels depend on the specific cleanroom class requirements. For example, in a Class 100 cleanroom, the number of particles larger than 0.5 micrometers per cubic foot of air should not exceed 100. If the particle count after the air shower does not meet the required standards, it may be necessary to check the air shower’s filtration system, air velocity, and the integrity of the air shower enclosure.
Filter Integrity Testing
The filters in an air shower play a vital role in removing particles from the air. Over time, filters can become clogged or damaged, which can affect the performance of the air shower. To check the filter integrity, we can use a particle counter or a filter integrity tester.
One common method for filter integrity testing is the DOP (Dioctyl Phthalate) test. In this test, DOP aerosol is introduced upstream of the filter. A particle counter is then used to measure the particle concentration upstream and downstream of the filter. The ratio of the downstream particle concentration to the upstream particle concentration is used to determine the filter’s efficiency. A high – quality filter should have a very low downstream particle concentration.
Another way to check the filter is by visual inspection. Open the filter housing and inspect the filter for any signs of damage, such as holes or tears. If the filter is visibly dirty or damaged, it should be replaced immediately.
Airflow Pattern Analysis
The airflow pattern within the air shower is also important for its performance. A proper airflow pattern ensures that all surfaces of the objects passing through the air shower are effectively cleaned. To analyze the airflow pattern, we can use smoke tubes or airflow visualization devices.
Introduce a small amount of smoke into the air shower at different locations. Observe the movement of the smoke. The smoke should be evenly distributed throughout the air shower and flow towards the exhaust outlets. If the smoke accumulates in certain areas or does not flow properly, it indicates an uneven airflow pattern.
An uneven airflow pattern can be caused by blocked nozzles, improper air distribution duct design, or a malfunctioning fan. By identifying and correcting the issues causing the uneven airflow pattern, we can improve the overall performance of the air shower.
Door Interlock Functionality
The door interlock system in an air shower is designed to prevent the simultaneous opening of the entry and exit doors, which helps to maintain the pressure differential between the cleanroom and the non – clean area. To check the door interlock functionality, simply try to open the entry and exit doors simultaneously.
The door interlock should prevent both doors from being open at the same time. If the door interlock fails to function properly, it can lead to the entry of unfiltered air into the cleanroom, compromising the cleanliness of the environment. In such cases, the door interlock system should be inspected and repaired or replaced if necessary.
Noise Level Measurement
Although not directly related to the particle – removing performance, the noise level of an air shower can be an important factor, especially in work environments where noise can cause discomfort or interfere with communication. Use a sound level meter to measure the noise level of the air shower during operation.
The acceptable noise level for an air shower typically ranges from 60 – 70 decibels. If the noise level exceeds this range, it could be due to a malfunctioning fan, loose components, or improper installation. Identifying and addressing the source of the excessive noise can improve the working environment for personnel using the air shower.
Regular Maintenance and Calibration
In addition to the above – mentioned performance checks, regular maintenance and calibration of the air shower are essential. Maintenance tasks include cleaning the interior of the air shower, replacing filters at regular intervals, and lubricating moving parts.
Calibration of the sensors and control systems in the air shower should also be carried out periodically. This ensures that the air velocity, particle counting, and other performance parameters are accurately measured. By following a strict maintenance and calibration schedule, we can ensure the long – term reliable performance of the air shower.
In conclusion, as an air shower supplier, I highly recommend that our customers conduct regular performance checks on their air showers. By monitoring air velocity, particle count, filter integrity, airflow pattern, door interlock functionality, and noise level, and by performing regular maintenance and calibration, you can ensure that your air shower is operating at its best. This not only helps to maintain a clean and contamination – free environment but also extends the lifespan of the air shower.
Steel Rolling Shutter If you are in need of an air shower or have any questions about air shower performance checks, feel free to contact us for a detailed consultation. We are committed to providing you with high – quality air shower products and professional technical support.
References
- "Cleanroom Technology Handbook", edited by William D. Davis, CRC Press.
- "Fundamentals of Industrial Ventilation", by John J. McKernan, American Conference of Governmental Industrial Hygienists.
- Manufacturer’s manuals of air shower systems and related equipment.
Suzhou Denasi Intelligent Technology Co., Ltd.
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