How to choose a laboratory ultrapure water machine?
How to choose a laboratory ultrapure water machine?
How to choose a laboratory ultrapure water machine? Author: laboratory ultra-pure water for the laboratory and offers great convenience needed water, but many institutions in the choice of laboratory ultrapure water machine, when there will be a lot of errors, leading to the procurement of equipment can not meet the test Room water demand. So, how should companies choose laboratory ultrapure water machines? Today, the environmental protection customer service will take you to find out. 1. Water consumption The water production capacity of ultrapure water machines currently on the market is generally 5-45 liters/hour. Customers should choose the specifications of the ultrapure water machine according to the actual water consumption, and generally follow 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 ultrapure water machine will be consumed quickly, and if the specification is too large, it will be wasted. If the concentrated water consumption is large, you need to buy a larger pure water bucket, otherwise the fresh water cannot keep up. 2. Water quality The national laboratory standard water is divided into first, second and third grades, but most laboratories use two kinds of water quality, one is the third grade water, such as distilled water, used for cleaning glassware, etc.; It is the first grade water, mainly used for chemical analysis or liquid phase, atomic absorption and other precision instrument analysis. Customers should choose the grade of ultra-pure water machine according to actual water quality requirements. The ultra-pure water machine that uses tap water as the water source has two (two types of water) outlets, one is pure water; the other is first-level water, that is, ultra-pure water (strictly speaking, the resistance of the first-level water is greater than 10 trillion Ohms, while the resistance of ultrapure water is greater than 18 megohms). Most customers are not clear 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. They often find the water quality after purchasing an ultra-pure water machine. not to standard. According to experience, you can follow the following shopping principles, and you can correspond. 1. The experiment content is divided into inorganic experiment and organic experiment. Inorganic experiment only needs water quality with resistance greater than 18 megohms, while organic experiment usually removes organic matter in water, so in addition to resistance greater than 18 megohms, total organic carbon index is also required. . If it is a biological experiment, it is necessary to remove bacteria in the water. 2. Type of instrument; Customers can choose the ultrapure water machine according to the type of instrument used. The resistance of the liquid water is greater than 18 megohms; and organic matter must be removed; the water used for atomic absorption, atomic fluorescence and environmental monitoring instruments is greater than 18 megohms; the water used for life science instruments needs to be sterilized in addition to the resistance greater than 18 megohms, except for organic matter , In addition to the heat source. 3. Current water source If the customer’s current water is qualified, he can also inform the ultrapure water machine manufacturer of the source of the pure water, and his technical staff will recommend the corresponding specifications and models based on the situation. The above three principles are based on actual application experience and can be referred to, but the most accurate model selection is to provide detailed water quality parameters, such as electrical resistance, trace elements, bacteria, total organic carbon level, etc. 3. Source water quality. When purchasing ultra-pure water machines, customers must provide the manufacturer with the water quality of the source water, such as heavy sand, high hardness, and groundwater. The process of ultra-pure water machines is based on the quality of the raw water. To be sure, there is a lot of sand, a pretreatment device is needed, the hardness is high, a softening device is added, the salt content is high, and the two-stage reverse osmosis process must be used. If you choose an ultrapure water machine that uses pure water as the water source, you only need to provide water quality requirements and water consumption.
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