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Precautions for use of laboratory ultrapure water machine:
1. Reverse osmosis membrane: Reverse osmosis membrane is an important part of ultrapure water machine. Its pore size is very small. Therefore, microscopic substances such as bacteria are often deposited on the surface during use. Generally, pure water machines of various manufacturers have A backwash function designed to wash away contaminants. The water consumption can be washed 3-5 times within 10 liters/day. If it exceeds 10 liters, it should be washed several times. If it is not used for a long time (such as more than 1 month), it needs to be taken out and immersed in the disinfectant to avoid the breeding of bacteria. However, the process is troublesome. It is recommended that even if it is not used, it is often turned on with a small amount of water to allow the inside of the machine. The water forms a circulation, and the deposition time of the dead water is minimized. The life of the reverse osmosis membrane is 2-3 years, which is mainly determined by the customer's water consumption, so the user must choose the matching specifications when purchasing.
2.Precision filter: Precision filter, also known as filter filter, split-line filter and PP melt-blown filter, mainly filter large particles such as sediment in raw water, the filtration accuracy is 5 microns, 1 micron and so on. The new filter element is white. If the surface is long, the surface will be silted, etc., and it will appear brown. This means that the filter element can not be used. After washing the surface sludge with tap water, it can barely continue to use for 1-2 weeks, but it cannot be used for a long time. . The filter element is placed inside the filter bottle. Some filter bottles are transparent. The color change of the filter element can be visually observed. Some filter bottles are opaque and need to be unscrewed to observe the change of the filter element. From the empirical data statistics, the life of the precision filter is generally 36 months. If there is more sediment in the raw water, the life is shorter, and there are fewer particles such as sediment, and the life is slightly longer.
3. Activated carbon filter: Activated carbon filter mainly removes odor and organic matter in water through adsorption. There is residual chlorine in the tap water, which has a great oxidation effect on the reverse osmosis membrane, so it must be removed by activated carbon. There is no intuitive change in the surface of the activated carbon filter. According to experience, it is generally saturated in a year or so and needs to be replaced.
4. Water: Laboratory water purifiers with tap water as the water source generally have two water outlets, namely three-stage water and first-grade water. The water that is reverse osmosis is three-stage water and is stored in the water tank. The grade water is ready to use and is not stored. The tertiary water does not pass through the purification column, and the first stage water passes through the purification column, and the cost of the first stage water is higher than that of the third stage water. Therefore, when customers use it in daily use, they should take water according to the water quality requirements. When using the third-grade water, try not to use the first-grade water to avoid the rising cost.
5. Purification column: The purification column is sometimes called ultra-purification column according to the customer's water quality requirement. The self-acting is deep desalting of reverse osmosis pure water, and the Zui finally reaches the level of first-grade water or ultra-pure water. The principle is ion exchange. The lifetime of the purification column is represented by the resistivity online. Below a certain resistance means that the purification column has expired and is relatively intuitive. Its life is mainly affected by the amount of water used by customers.
Laboratory ultra-pure water machine operation precautions
When the laboratory ultra-pure water machine is used, it needs special attention at 5 o'clock. The working principle of the laboratory pure water machine is that the tap water is pretreated by the precision filter element and the activated carbon filter element to filter the particles such as sediment and the adsorption of odor, so that the tap water becomes cleaner. Then, the water is purified and desalted by the reverse osmosis device, and the purified water is stored in the storage tank, and the water quality can reach the national three-level water standard, and the wastewater produced by the reverse osmosis device is discharged. The reverse osmosis pure water is subjected to deep desalting treatment through the purification column to obtain first-grade water or ultra-pure water. If the user has special requirements after the Zui, the device is added with ultraviolet sterilization or microfiltration or ultrafiltration after the ultra-pure water to remove the water. Residual bacteria, particles, heat sources, etc. The precision filter element, activated carbon filter element, reverse osmosis membrane and purification column are all materials with relative life. The precision filter element and the activated carbon filter element are actually the protection of the reverse osmosis membrane. If they fail, the load of the reverse osmosis membrane is aggravated and the life is reduced. Short, if you continue to boot, 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. The final result of zui is to increase the cost of using ultra-pure water machines.