Third-party clean room testing for electronic dust-free workshops

Third-party Clean room Testing for Electronic dust-free workshops generally requires comprehensive clean-related testing capabilities, and can provide third-party testing, debugging, consulting and other professional technical services for dust-free clean workshops and clean plants such as pharmaceutical GMP workshops, electronic dust-free workshops, food and drug packaging material workshops, sterile medical device workshops, hospital clean operating rooms, biological general laboratories, health food GMP workshops, cosmetics/disinfectant workshops, animal laboratories, veterinary GMP workshops, and drinking bottled water workshops.

The scope of dust-free clean workshop testing generally includes: dust-free clean workshop environmental grade assessment, project acceptance testing, including food, health products, cosmetics, bottled water, milk production workshops, electronic product production workshops, GMP workshops, hospital operating rooms, animal laboratories, biosafety laboratories, biosafety cabinets, Clean benches, dust-free workshops, sterile workshops, etc.

Third-party clean room testing for electronic dust-free workshops Testing items: Wind speed and volume, ventilation times, temperature and humidity, pressure difference, suspended particles, floating bacteria, settling bacteria, noise, illumination, etc. For details, please refer to the relevant standards for dust-free clean workshop inspection.

Third-party clean room inspection for electronic clean workshop

1. Wind speed, air volume, ventilation times

The cleanliness of dust-free clean workshops and clean areas is mainly achieved by supplying a sufficient amount of Clean air to replace and dilute the particulate pollutants generated in the room. For this reason, it is necessary to measure the air supply volume, average wind speed, air supply uniformity, air flow direction and flow pattern of dust-free clean workshops or clean facilities.

One-way flow mainly relies on clean air flow to push and replace polluted air in the room and area to maintain the cleanliness of the room and area. Therefore, its air supply section wind speed and uniformity are important parameters affecting cleanliness. Higher and more uniform cross-sectional wind speeds can remove pollutants generated by indoor process faster and more effectively, so they are the main inspection items of concern.

Non-unidirectional flow mainly relies on the clean air supplied to dilute and dilute pollutants in the room and area to maintain its cleanliness. Therefore, the greater the number of ventilation times, the more reasonable the air flow pattern, the more significant the dilution effect, and the corresponding improvement in cleanliness. 

Therefore, the air supply volume and corresponding ventilation times of non-single-phase flow dust-free clean workshops and clean areas are the main airflow test items of concern.

In order to obtain repeatable readings, record the time average of the wind speed at each measuring point.

Ventilation times: calculated by dividing the total air volume of the dust-free clean workshop by the volume of the clean room

2. Temperature and humidity

The temperature and humidity measurement of dust-free clean workshops or clean facilities is usually divided into two levels: general test and comprehensive test. The first level is suitable for the delivery and acceptance test in an empty state, and the second level is suitable for static or dynamic comprehensive performance test. This type of test is suitable for occasions with strict requirements on temperature and humidity performance.

This test is carried out after the air flow uniformity test and the air conditioning system adjustment. When this test is carried out, the air conditioning system is fully operational and all conditions are stable. At least one humidity sensor is set in each humidity control area, and the sensor is given sufficient stabilization time. The measurement should be suitable for the purpose of actual use. The measurement should be started only after the sensor is stable, and the measurement time should not be less than 5 minutes.

3. Pressure difference

The purpose of this test is to verify the ability to maintain the specified pressure difference between the completed facility and the surrounding environment, and between the spaces in the facility. This test is applicable to all three occupancy states. This test needs to be conducted regularly.

The pressure difference test should be conducted with all doors closed, from high pressure to low pressure, starting from the inner room farthest from the outside world in the plane layout, and then tested outward in sequence; there are holes connecting adjacent dust-free clean workshops (areas) of different levels, and the holes should have reasonable airflow directions, etc.

a. Pressure difference test requirements:

• The static pressure difference measurement is required to be carried out with all doors in the clean area closed.

• On the clean plane, it should be carried out in order from high to low cleanliness, and the test should be carried out until the room directly connected to the outside.

• The measuring pipe mouth can be set anywhere in the room without airflow influence, and the measuring pipe mouth surface is parallel to the airflow streamline.

• The measured and recorded data should be accurate to 1.0Pa.

b. Pressure difference detection steps:

• Close all doors first.

• Use a micro differential pressure gauge to measure the pressure difference between each dust-free clean room, between the corridors of the dust-free clean room, and between the corridor and the outside world.

• Record all data.

c. Pressure difference standard requirements

Determine the positive or negative pressure value of the dust-free clean room to be tested according to the design or process requirements of the dust-free clean room.

• The static pressure difference between dust-free clean rooms or clean areas of different levels and non-dust-free clean rooms (areas) should not be less than 5Pa.

• The static pressure difference between the dust-free clean room (area) and the outdoors should not be less than 10Pa.

• For unidirectional flow dust-free clean rooms with air cleanliness levels stricter than level 5 (level 100), when the door is opened, the dust concentration of the indoor working surface at 0.6m inside the door should not be greater than the dust concentration limit of the corresponding level.

• If the above standards are not met, the fresh air volume and exhaust air volume should be readjusted until they are qualified.

The above content is about the wind speed and volume, ventilation times, temperature and humidity, and pressure difference in the test items of the third-party dust-free clean room testing agency. I hope it will be helpful to you.