1. Do not start the counter when the inlet tube is covered or blocked. 2. The laser dust particle counter should be used in a clean environment to prevent damage to the laser sensor. 3. Do not measure mixed gases (such as hydrogen and oxygen) that may react. This gas may also explode inside the counter. To test these gases, contact the manufacturer for more information. 4. No high pressure decompression equipment (such as high pressure diffuser) should not sample compressed air. All particle counters are designed to operate at one atmosphere. 5. Water, solution or other liquids cannot enter the sensor from the inlet tube. 6. The particle counter is mainly used to test the clean environment of the purification workshop. When the measured material has loose particle material, dust source and spray, it must be kept at least twelve inches away from the inlet pipe. In order to avoid contamination of the sensor and piping with the above particles and liquids. 7. At the time of sampling, the gas contaminated by the gas discharged from the counter itself or by the counter is sampled. 8. When connecting an external printer or connecting an external temperature and humidity sensor, you need to turn off the counter first; when performing the printing operation, the printer must have printing paper, otherwise the print head will be damaged. The standards for airborne particles in each of the above categories are as follows: Cleanliness level suspended particles maximum allowable number / cubic meter Static dynamic ≥0.5μm≥5.0μm≥0.5μm≥5.0μm Class A 352020352020 Class B 3520293520002900 C grade 3520002900352000029000 Class D 352000029000 is not regulated and is not specified. Wholesale Theater Furniture Bossgoomall wholesale theater furniture, the main products havetheater furniture，furniture，cheap theater furniture，theater furniture，furniture. theater furniture made in China is of high quality and sold overseas. Bossgoomall not only sells furniture, but also sells accessories. On Bossgoomall you can buy cheap and good-quality goods. Theater Furniture,Furniture,Cheap Theater Furniture