The TS type clean room is a laminar flow using air unidirectional air flow (horizontal parallel flow), and is purified by multiple stages, and then the air is sent to the working area by the air supply unit, so that the cycle is repeated. Cleanliness clean room. The TS clean room is also equipped with a TSFL type air shower room. The air shower room is installed at the entrance of the clean room. When the operator enters the clean room, it must first pass through the air shower room. When the air is sprayed, the polluted air is filtered through the medium and high-efficiency air filter, and the filtered clean air is blown to the various parts of the human body through the nozzle at a high-speed rotation and tangential direction, and the dust attached to the overalls is blown off.
The clean room has a purification area of 13m3; the cleanliness level is 100 (≥0.5μ total dust particles ≤3.5 grains/L; total air volume ≈6000m3/h, fresh air volume 5%; working area average cross-section wind speed ≥0.35 m/s; gas exchange times about 180 times / h; indoor positive pressure ≥ 0.5 mm water column; noise <70 decibels (A floor); power supply is FL-1 air shower 10.1kW, 380V, DY- Type 1 clean air supply unit 1kW, 380V, 220V lighting and 380V power socket, etc. The clean room and air shower room circuits are controlled by electrical box, which is equipped with 75A ammeter and 450V voltmeter. The equipment has the characteristics of high cleanliness, good sealing, good rigidity, light and beautiful, not easy to accumulate dust, and can build a clean working environment in a short time. Therefore, it is widely used in electronics, precision instruments, instruments and medicines. And various production sites that require high air cleanliness; they are also commonly used in quality inspection, sanitation and epidemic prevention, hospitals and other departments to require clean rooms and operating rooms with high air cleanliness.
Since the power supply of the device is relatively large, the current and voltage meter should be regularly sent to the metrology department for verification during use, and the device should not be overloaded when working. Always observe the working state of the device on the electrical control box. Whether the current and voltage indicated by the current and voltmeter match the current and voltage in actual use. If the current used is large and the current indicated by the ammeter is small, stop using it immediately, and send the ammeter to the metrology department for verification. ,service. Also pay attention to the clean room and air shower room cleaning, before and after the experiment with 5% of the Sulfur dilution wipe the filter air supply, return air purification unit, equipment inner wall, work surface and air shower filter, wall And the spout, the purification unit filter should be removed and cleaned frequently to ensure the normal operation of the clean air supply unit. In addition, the clean room air cleanliness should be tested frequently. This test requires some instruments. For example, the cleanliness level (dust concentration in clean indoor air) needs to be measured by a dust particle counter; the average wind speed of the section needs heat.
The ball anemometer is used for the determination; the indoor positive pressure is measured by a tilting micrometer; the noise is measured by a precision sound level meter and the like. According to the above test method, the clean room is measured, and the test result is accurate. However, since the test method requires more instruments, and the unit of use of the device generally cannot fully meet the test condition, it is impossible to Clean room for testing. So, how do users use the clean room air cleanliness? How to create a pollution of the clean room? How to make the test results true and accurate? The following is a simple method for determining the cleanliness of a clean room by testing the settled bacteria in clean indoor air. The method--the sedimentation method is to collect the microbial particles in the air by the principle of natural sedimentation in a glass plate of a high-pressure bacteria, and add a nutrient agar medium at a temperature of 45 ° C, after cooling by the heart, after a certain time under suitable conditions. Let it breed to visible colonies for counting, and determine the number of viable microorganisms in the clean environment by colonies in the dish, and thereby assess the dust concentration of the clean room.
First, the required equipment:
High-pressure bacteria sterilizer (use the sterilizer instructions strictly according to the instructions), constant temperature incubator (the thermometer of the incubator must be sent to the metrology department for regular inspection), culture dish (usually Φ90mm × 15mm borosilicate glass culture dish), medium - Nutritional agar.
1. Medium formula
10 g of egg folds, 3 g of beef extract, 5 g of sodium chloride, 18 g of agar, and 1000 ml of distilled water.
2. System of law
Deeply add the ingredients other than agar to distilled water, add about 2 ml of 15% sodium hydroxide deep solution, adjust the pH to 7.2-7.4, add agar, heat and boil, dissolve the agar, and dispense in a conical flask, 121 Autoclave at °C for 15min, cool and place in the refrigerator at 2~5 °C for storage.
Second, the test steps
1. Sampling method
The petri dish which was autoclaved at 121 °C for 30 min was placed in the front, back and middle positions on the clean bench surface. The placement method is shown in Figure 1. (The surface of the sampling point should be evenly distributed to avoid sampling points in a certain local area. Concentrated or too sparse). Place 2 Petri dishes at each test point. The culture dishes should be numbered and indicate the area tested. After the culture dish was placed as shown in Fig. 1, the culture dish cover was opened, and the culture dish was exposed for 0.5 h, and then the culture dish cover was covered. Note that all test equipment must be sterilized during sampling, and artificial contamination of the sample should be prevented to ensure the reliability and accuracy of the test.
