First, the use of ultra-pure water machine
1. Turn on the tap and the water pressure will gradually decrease. After a few seconds, the purifier discharged water normally, which proved that the water inlet solenoid valve was good.
2. Close the inlet ball valve, stop the water purifier and open the inlet ball valve. After tens of seconds, the water purifier is turned on, which proves that the low-voltage switch of the water purifier is intact and effective.
3. After everything is normal, fill the pressure storage tank with pure water, turn on the tap, and let the pure water wash the activated carbon until the water quality is clean. Turn off the tap and let the machine run normally.
Matters needing attention in the use of ultra-pure water machine
The actual water output of ultra-pure water machine will be affected by raw water pressure, raw water temperature and other conditions, among which raw water temperature has a great influence on it. Low temperature will reduce water production. Please operate the equipment at ventilated and dry room temperature to avoid dust pollution; Avoid long-term operation of equipment below zero degrees Celsius.
Second, how to buy ultra-pure water machine
Pure water difference
Before choosing the ultra-pure water machine in the laboratory correctly, we must understand the following concepts: What is pure water? What is ultrapure water? What's the difference between them?
Pure water, also known as pure water, refers to water that meets the sanitary standard of drinking water, is sealed in a container, contains no additives, is colorless and transparent, and can be directly drunk by electrodialysis, ion exchange, reverse osmosis, distillation and other appropriate treatment methods. The space water and distilled water sold in the market are pure water.
Ultra-pure water is water in which the conductive medium in water is almost completely removed on the basis of pure water, and the undissociated colloidal substances, gases and organic substances in water are also removed to a very low degree. The resistivity is greater than 18mω* cm, or close to the limit value of 18.25mω* cm. Ultra-pure water is difficult to achieve by ordinary processes. Through reasonable process design and equipment selection, two or more of microfiltration technology, ultrafiltration technology, reverse osmosis technology, EDI technology and ion exchange technology can be used to produce ultra-pure water, and the resistivity can reach 18.20 mω * cm.
Ultrapure water equipment is a device for preparing pure water for laboratory inspection and quarantine. Laboratory ultra-pure water machine is suitable for testing centers, scientific research institutes, universities, hospitals, and laboratories of enterprises, and provides water needed for analytical testing, reagents, experiments, and analytical instruments. ? In inorganic and analytical chemistry experiments, the requirements for water purity are different according to different tasks and requirements. Pure water can be divided into "pure water" and "ultrapure water".
In the process of purchasing ultra-pure water equipment, people often confuse these two concepts, which leads to difficult selection and unreasonable increase in material supply costs. Pay attention to the following points when purchasing ultra-pure water equipment:
1. When purchasing ultra-pure water equipment, it is best to meet the requirements of effluent quality according to the nature of your enterprise and the purpose of the experiment, so as to choose the model for you according to previous sales experience;
2. The reference index of purchasing ultra-pure water equipment model should follow the principle of "high is not low";
3. The general water quantity is calculated as 8 hours per day. If the water output of ultra-pure water equipment is 15L/ hour, its daily water output should be120l;
Super pure water machine brand
At present, the domestic ultra-pure water machine market has changed from the situation of dominating the world in the past to the situation of "one is dominant and a hundred schools of thought contend". Domestic ultra-pure water machine manufacturers have made great progress, but the overall technical level is relatively low, and there are still few manufacturers who can really do ultra-pure water. Many manufacturers raise the resistivity to 18.2? mω。 It is a misunderstanding that cm pure water is understood as ultrapure water. Because many organic molecules, bacteria and particles do not exist in the form of ions, it will not affect the determination of resistivity. As a result, when the resistivity reading is good, water may still be contaminated by organic substances and bacteria. Such water can't be called ultrapure water. Real ultrapure water contains almost no impurities. Nowadays, the domestic ultra-pure water machine market is booming, and a large number of manufacturers are striving to improve their technical level and open up new horizons.
Third, the maintenance of ultra-pure water machine
Utilization of water
Ultra-pure water machines with tap water as water source generally have two water outlets, namely tertiary water and primary water. The water after reverse osmosis is tertiary water, which is stored in the water tank. The primary water is reserved and not stored. The tertiary water did not pass through the purification column, but the primary water passed through the purification column, and the cost of the primary water was higher than that of the tertiary water. Therefore, in daily application, water should be taken according to the quality requirements, and the first-class water should not be used when the third-class water can be used, so as to avoid increasing the use cost.
Precision filter element
Precision filter element, also known as filter element, wire wound filter element and PP melt-blown filter element, mainly filters large particles such as sediment in raw water, and its filtering accuracy is 5 microns, 1 micron, etc. The new filter element is white. If the surface is still brown after a long time, it means that the filter element cannot be used. After the surface sludge is washed off with tap water, it can barely continue to be used for 1-2 weeks, but it cannot be used for a long time. The filter element is placed in the filter bottle. Some filter bottles are transparent, and the color change of the filter element can be observed intuitively. Some filter bottles are opaque and need to be unscrewed to observe the change of filter element. According to empirical statistics, the life of precision filter element is generally 3-6 months. If there is more sediment in raw water, the life will be shorter, and if there are less particles such as sediment, the life will be slightly longer.
Activated carbon filter element
Activated carbon filter is made of high-quality shell carbon and coal-based activated carbon as raw materials, supplemented by food-grade adhesive, and processed by special technology. It integrates adsorption, filtration, interception and catalysis, and can effectively remove radioactive substances such as organic matter and residual chlorine in water, and has the effects of decolorization and odor removal. It is an ideal new generation product in liquid and air purification industry. Types: white-headed sintered activated carbon filter, black-headed belt skeleton, sintered activated carbon filter, granular activated carbon filter, etc. On the surface, the activated carbon filter element has no intuitive change. According to experience, it usually reaches saturation adsorption in about one year and needs to be replaced.
Reverse osmosis membrane
Reverse osmosis membrane is a very important part of ultra-pure water machine, and its pore size is very small, so trace substances such as bacteria are often deposited on its surface during use. Generally, water purifiers of various manufacturers have backwashing function to wash away pollutants. If the water consumption is within 10L/ day, it can be washed 3-5 times, and if it exceeds 10L, it can be washed several times more. If you don't use it for a long time (for example, 1 month or more), you need to take it out and soak it in disinfectant to avoid bacterial growth. However, this process is more troublesome. It is suggested that even if water is not used, a small amount of water should be used frequently to circulate the water inside the machine and minimize the deposition time of accumulated water. The life of reverse osmosis membrane is 2-3 years, which is mainly determined by water consumption, so the matching specifications must be selected when selecting.
purification column
Purification column is sometimes called ultra-purification column according to customer's water quality requirements, and its function is to deeply desalt reverse osmosis pure water, and finally reach the level of first-class water or ultra-pure water. Its principle is ion exchange. The life of the purification column is represented by online resistivity. If the resistance is lower than a certain value, it means that the purification column has expired, which is more intuitive. In the production design of various manufacturers, in addition to water consumption resistance, its service life is particularly important to the filling amount and quality of ion exchange resin.
After reading the above introduction, everyone should have a clear understanding of the use of ultra-pure water machine. If you don't understand the details, you can consult the manual. If it's not in the manual, then Baidu. If you don't even have Baidu, you can only find after-sales service. So much for the introduction of ultra-pure water machine. Want to know more, please continue to pay attention to Tuba rabbit decoration!
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