Water consumption The ultra-pure water machine on the market currently has a water production of 5-20 liters / hour, and more than 20 liters are non-standard models. The customer should choose the specifications of the ultra-pure water machine according to the actual water consumption, generally following the principle of double relationship. If the water consumption is 20 liters / day, choose a machine with a specification of 10 liters / hour. If the specification is too small, the consumables of the ultra-pure water machine will consume quickly. If the specification is too large, it will result in waste. If the concentrated water consumption is large, you need to buy a larger pure water bucket, otherwise the water production can not keep up with the water quality. The national laboratory standard water has three types of water quality: first-level water, second-level water, and third-level water, but most laboratories use Two types of water quality are sufficient. One is tertiary water, such as distilled water, used for cleaning glassware, etc. The second is first-grade water, which is mainly used for chemical analysis or precision instrument analysis such as liquid phase and atomic absorption. Customers should choose the grade of ultra-pure water machine according to the actual water quality requirements. The ultrapure water machine with tap water as the source has two (two water quality) outlets, one is pure water, that is, three-level water; the other is first-grade water, that is, ultra-pure water (strictly speaking, first-level water Resistance is greater than 10 megohms, while ultra pure water resistance is greater than 18 megohms) Most customers are unclear about their water quality requirements. Although the relevant national departments have various water quality standards, they do not have complete quantitative indicators for specific experimental projects or instrumental analysis of water use. They often find the water quality after purchasing an ultrapure water machine not to standard. According to experience, you can follow the following principles of purchase, corresponding to it.
The content of the experiment is divided into inorganic experiments and organic experiments. Inorganic experiments only need water with a resistance greater than 18 megohms, and organic experiments usually need to remove organic substances in the water, so in addition to the resistance greater than 18 megohms, an index of total organic carbon is also required . If it is a biological experiment, remove bacteria in the water.
Instrument type Customers can choose the ultrapure water machine according to the type of instrument used. The resistance of the liquid phase water is greater than 18 megohms; and organic matter must be removed; the water for atomic absorption, atomic fluorescence and environmental monitoring instruments is greater than 18 megohms; the water for life science instruments such as PCR needs to be sterilized in addition to the resistance greater than 18 megohms. In addition to organic matter, heat source.
Current water source If the customer's current water use is qualified, the source of pure water can also be notified to the ultra-pure water machine manufacturer, and its technical staff will recommend the corresponding specifications and models according to the situation.
The above three principles are based on actual application experience and can be referenced, but the most accurate model selection is to provide detailed water quality parameters, such as resistance, trace elements, bacteria, and total organic carbon level.
Raw water quality customers must provide the raw water quality status when purchasing ultra-pure water machine, such as more sediment, high hardness, groundwater, etc. The process of the ultra-pure water machine is determined according to the quality of the raw water. If there is much sediment, a pretreatment device should be added, the hardness is high, a softening device should be added, the salt content is high, and the secondary reverse osmosis process should be used. If you choose an ultra-pure water machine that uses pure water as the source, you only need to provide water quality requirements and water consumption.
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