Laboratory pure water machines generally use advanced reverse osmosis technology to manufacture pure water. The working principle of the laboratory pure water machine is to apply a certain pressure to the water, so that the water molecules and ionic mineral elements pass through the reverse osmosis membrane, and most of the inorganic salts (including heavy metals), organic matter and bacteria, dissolved in the water Viruses cannot penetrate the reverse osmosis membrane, so that the pure water that has penetrated and the concentrated water that has not penetrated are strictly separated.
The pore size of the reverse osmosis membrane is only 0.0001 microns, and the diameter of viruses is generally 0.02-0.4 microns, and the diameter of ordinary bacteria is 0.4-1 microns. The water from the laboratory pure water machine meets the drinking water standard. Laboratory pure water machine is based on reverse osmosis technology, adding ion exchange and terminal treatment technology. Some also have deep ion desalination, ultrafiltration and UV photo-oxidation equipment, and the water quality is better than the national standard GB / T6682-2008 water quality requirements for laboratory first-class water.
The working principle of the laboratory pure water machine reverse osmosis is to use a high-pressure pump to provide a pressure greater than the osmotic pressure of the high-concentration solution. The water molecules will be forced to pass through the semi-permeable membrane to the low concentration side. 99% of most pollutants including inorganic ions, because of its superior purification efficiency, reverse osmosis is a very effective technology in water purification systems, because reverse osmosis can remove most of the dirt, so it is often Used as a pretreatment method, the laboratory pure water machine can significantly extend the use time of the deionization exchange column. In view of the fact that reverse osmosis is very critical in the process of water purification and the replacement price of reverse osmosis membranes is relatively high, we recommend that users must choose laboratory pure water machines with protective functions for reverse osmosis membranes.
In order to extend the service life of the reverse osmosis membrane as much as possible and improve the filtration efficiency of the reverse osmosis membrane, the laboratory pure water machine adopts a unique technology, combined with the leading reverse osmosis current limiting design, and a limited flow valve at the water outlet to keep the reverse osmosis membrane always Soaked in water, will not affect the life due to drying out. Extending the life of the reverse osmosis membrane is to ensure the quality of the effluent, and also improve the cost performance of the laboratory pure water machine. The quality of the reverse osmosis membrane has a great impact on its life and the life of the ultra-purification column, so we recommend that users pay attention to the brand of reverse osmosis membrane, such as Dow and GE.
The working principle of the laboratory pure water machine, terminal processing mainly produces ultra-pure water of ultra-low organic type, aseptic type, non-heat source type, etc. according to the special requirements of customers. There are various treatment methods for different requirements, such as ultrafiltration filtration method for removing heat sources, dual-wavelength ultraviolet oxidation method for reducing total organic carbon (TOC) in water, microfiltration to remove bacteria, etc. Ultrafiltration (UF) membrane is a molecular sieve. Based on the size, it allows the solution to pass through a very fine filter membrane to achieve the purpose of separating molecules of different sizes in the solution. It can reduce the heat source content in ultrapure water to 0.001EU / ml or less. The dual-wavelength ultraviolet oxidation method can use light to oxidize organic compounds to reduce the total organic carbon concentration in ultrapure water to below 5 ppb.
The laboratory pure water machine used in the laboratory uses tap water as the influent water quality, and is pretreated by a precision filter cartridge and an activated carbon filter cartridge, which can filter out the sediment and other particles in the raw water and absorb odors. The laboratory pure water machine makes the water quality meet The water quality requirements of the reverse osmosis system. The laboratory pure water machine uses a reverse osmosis device to carry out deep purification and desalination treatment of the water quality. The purified water enters the storage tank for storage, and its water quality can reach the national third-level water standard. At the same time, the wastewater produced by the reverse osmosis device is discharged.
Reverse osmosis pure water passes through the purification column for deep desalination treatment to obtain first-grade water or ultra-pure water. Finally, if the user has special requirements, ultraviolet sterilization or microfiltration, ultra-filtration and other devices are added after the ultra-pure water to remove residual water Bacteria, particles, heat sources, etc.
Operation instructions for the correct use of laboratory pure water machine
The power of the laboratory pure water machine is very small, generally between 30 and 200W. The laboratory pure water machine has to undergo strict insulation resistance value test, electrical strength test and leakage current test before leaving the factory, but the safety of electricity is also required Pay attention to prevention.
As long as it is safe under normal use, be careful not to use electricity in violation of the rules. Do not manually cut the working power cord when the plug is placed in the socket. If it is operated, it may cause short circuits and sparks. Fire may cause serious consequences.
The chassis of the ultrapure water machine equipment is insulated and has been tested. Customers who use electricity safely must keep in mind that, for example, they must not use water-soaked hands to pull out and plug in the power plug, or splash water on the plug.
Ultra-pure water machine accessories such as precision filter elements, activated carbon filter elements, reverse osmosis membrane elements, and purification columns are consumables with relatively long life. The precision filter elements and activated carbon filter elements are actually protection of reverse osmosis membranes. If they fail, then the reverse osmosis membranes The load will increase, and the life will be shortened. If you continue to turn on, the quality of the pure water produced will decrease, which will increase the burden on the purification column, and the life of the purification column will be shortened, which eventually leads to the water quality of the laboratory pure water machine. decline. Therefore, regular inspection and cleaning of accessories is an important link to ensure the normal and stable operation of laboratory pure water machine.