Routine maintenance of laboratory ultrapure water machine

They are three-stage water and first-grade water, respectively. The ultra-pure water system with tap water as the water source generally has two outlets. The water that has been reverse osmosis is tertiary water and is stored in the water tank, while the first 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 interest 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 prevent the increase of the cost.

Regardless of imported or domestic equipment,

First of all, simply understand the ultra-pure water machine. The principle is the same. 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, and then the water is purified and desalted by the reverse osmosis device, and the purified water enters the water storage tank. When stored, the water quality can reach the national three-level water standard, and the wastewater from the reverse osmosis device (also known as “concentrated water” is discharged. The reverse osmosis pure water is deeply demineralized through the purification column to obtain first-grade water or ultra-pure. After water, after the user has special requirements, add ultraviolet sterilization or microfiltration, ultrafiltration and other devices behind the ultrapure water to remove the remaining bacteria, particles, heat sources, etc. in the water.

The precision filter element and the activated carbon filter element are actually the maintenance of the reverse osmosis membrane. The precision filter element, the activated carbon filter element, the reverse osmosis membrane and the purification column are all materials with relative life. If it fails, the load on the reverse osmosis membrane will increase and the life will be shortened. If the water is continuously turned 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. The final result of zui is to increase the use of ultra-pure water machine.

Ultra pure water machine is used, so. There are things like the following that need attention.

Precision filter

Split wire filter and PP melt blown filter, precision filter is also called filter. It mainly filters large particles such as sediment in raw water, and its filtration precision is 5 micrometers, 1 micrometer, and the like. The new filter element is red. If the time is long, the surface will be silted, etc., and it will appear brown. This means that the filter can't be washed out with tap water and can be used for 1-2 weeks, but it can't be used temporarily. 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 before they can observe the change of the filter element. From the empirical data statistics, the life of the precision filter is generally in March and June. 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.

2. Activated carbon filter

Remove odor, organic matter, etc. from the water. There is residual chlorine in the tap water, and the activated carbon filter mainly passes the adsorption. It has a large oxidation effect on the reverse osmosis membrane and must be removed via activated carbon. The activated carbon filter has no visual change from the outside. According to experience, it generally reaches saturation adsorption in about one year and needs to be replaced.

3. Reverse osmosis membrane

Its pore size is very small, and the reverse osmosis membrane is an important part of the ultrapure water machine. Therefore, in the course of use, microscopic substances such as bacteria are often deposited on the surface. Generally, the pure water machines of various manufacturers have a backwashing function, aiming to wash away the pollutants. The water consumption is within 10 liters/day, and it can be washed 3-5 times. If it exceeds 10 liters, it should be washed several times. If it is not necessary for a long time (such as more than 1 month), it needs to be taken out and immersed in the disinfectant to prevent the growth 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. Water forms a circulation and minimizes the accumulation of stagnant water for too long. The life of the reverse osmosis membrane is 2-3 years, which is mainly determined by the customer's water consumption. Therefore, users must choose the matching specifications when purchasing.

4. Purification column

Self-acting is the deep desalination of reverse osmosis pure water. The purification column is sometimes called ultra-purification column according to the customer's water quality requirements. Zui eventually 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. In addition to anti-customer water consumption, the life of the ion exchange resin and the ion exchange resin itself are particularly important for each manufacturer.

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