| Many people are blind in choosing the pure water machine in the laboratory. Is it good to choose the one with high price? Is it really affordable at a low price? The following small series tell you in the laboratory pure water machine selection to pay attention to the problem. 1、 Raw water quality When purchasing ultrapure water machines, customers must provide the manufacturer with the quality of raw water, such as sediment, hardness, groundwater, etc, Ultrapure water machine The process is determined according to the quality of raw water. If there is too much sediment, the pretreatment device should be added; if the hardness is high, the softening device should be added; if the salt content is high, the two-stage reverse osmosis process should be adopted. 2、 Water consumption
At present, the water production capacity of ultrapure water machines on the market is generally 5-20 L / h, and those with more than 20 L are non-standard models. Customers should choose the specification of ultra pure water machine according to the actual water consumption, and generally follow the principle of double relationship. If the water consumption is 20 L / D, the machine with the specification of 10 L / h will be selected. If the specification is too small, the consumables consumption of the ultrapure water machine will be very fast, and if the specification is too large, it will be a waste. If you choose a large water bucket, you will need a large amount of water. 3、 Water quality National laboratory standard water has three kinds of water quality: Grade I water, grade II water and grade III water, but most laboratories can use two kinds of water quality: one is grade III water, such as distilled water, used for cleaning glassware; the other is grade I water, mainly used for chemical analysis or liquid phase, atomic absorption and other precision instrument analysis. Customers should choose the grade of ultrapure water machine according to the actual water quality demand. The ultrapure water machine with tap water as its source has two kinds of water outlets: pure water, namely grade III water; grade I water, i.e. ultra pure water (strictly speaking, the resistance of primary water is greater than 10 megohm, while that of ultra pure water is greater than 18 megohm). Most customers are not very clear about their own water quality requirements. Although the relevant national departments have various water quality standards, they do not have complete quantitative indicators for specific experimental items or instrument analysis water. They often find that the water quality is not up to the standard after purchasing the ultra pure water machine. According to experience, the following principles can be followed for reference only: 1. The content of the experiment Inorganic Experiment and organic experiment are divided into inorganic experiment and organic experiment. Inorganic experiment only needs water quality with resistance greater than 18 megohm, while organic experiment usually needs to remove organic matter in water. Therefore, in addition to resistance greater than 18 megohm, it also needs the index of total organic carbon. If it is a biological experiment, the bacteria in the water should be removed. 2. Types of instruments Customers can choose ultrapure water machine according to the type of instrument used. The resistance of liquid phase water is more than 18 megohm, and the organic matter should be removed; the water for atomic absorption, atomic fluorescence and environmental monitoring instruments should be greater than 18 megohm; in addition to the resistance greater than 18 megohm, the water for life science instruments, such as PCR, should also be sterilized, in addition to organic matters, in addition to heat sources. 3. Current sources of water If the customer's current water use is qualified, the manufacturer of ultra pure water can also be informed of the source of the pure water, and its technicians will recommend the corresponding specifications and models according to the situation. The above three principles are based on practical application experience, but the most accurate model selection is to provide detailed water quality parameters as far as possible, such as resistance, trace elements, bacteria, total organic carbon level, etc. I believe you can buy a satisfied pure water machine after reading this article. "Three" Laboratory Pure water machine It is a laboratory pure water preparation system independently developed and produced on the basis of the advantages of laboratory pure water machines of world-class companies such as milipore, Pall and sartorius of Germany. The performance of Sanda series pure water machines is stable, High purity water can be directly prepared from tap water. The effluent quality standard is high, the price is cheap, and the operation cycle is long. There is no need to frequently maintain and replace various spare parts. The operation is extremely quiet. Our company has specially customized a series of small deionized water equipment for these customers. The water output is small, which can meet the requirements of laboratory water and small measurement of cleaning water. The water quality can be customized according to the requirements of customers and the specific needs of customers, which can produce different water quality and quantity.