2, water demand
First of all, we must understand how much water you can use a day in general, is continuous water or intermittent water, high-end ultrapure water instrumentation is generally how many liters of water per hour, which is equipped with a water tank, the general storage of water in the 20L-100L or so, the flow rate of the water is generally 1.5L/min -1.8 L/min or so, according to their total daily water consumption to choose the water production of ultrapure water machine.
3, the laboratory's raw water conditions
In order to ensure the long-term stable operation of the ultrapure water machine, the need for different raw water using different pretreatment, such as coarse filtration, softening, secondary desalination, etc.. The life of the pretreatment mainly depends on the condition of raw water and water consumption. Timely replacement of pretreatment can effectively protect the reverse osmosis membrane, extend the life of reverse osmosis membrane.
4, in the selection of ultrapure water machine should pay attention to the key components to understand the selection of choice
The key components of ultrapure water machine that is the microcomputer control system, reverse osmosis membrane and ultra-purification column group, imported reverse osmosis membranes and imports of ultra-purification column group is the key to the most important.
(A) reverse osmosis membrane
Reverse osmosis is an applied pressure on the high concentration of solution than the osmotic pressure difference between the pressure, water molecules will be forced to pass through a semi-permeable membrane to the side of the low concentration of reverse osmosis can be filtered out 90% -99% of the majority of pollutants, including inorganic ions, including the quality of the reverse osmosis membrane directly determines the quality of the life of its water quality and the good and bad. The quality of its effluent water directly affects the service life of the ultra-purification column, so the reverse osmosis membrane must choose a better brand.
(B) ultra-purification column
Ultra-purification column is through the principle of ion exchange exchange, that is, the positive ions in the water with the ion exchange resin in the H + ion exchange, the negative ions in the water with the ion exchange resin on the OH - ion exchange, so as to achieve the purpose of water purification. Removing ions by ion exchange can theoretically remove almost all ionic substances, and the resistivity of the effluent water can reach 18.25MΩ.cm at 25°C. The quality of the effluent water through the ultra-purification column mainly depends on the quality of the ion exchange resin loaded inside. Ultra-purification column mission by the quality of the ion exchange resin and filling the number of decisions, ion exchange resin filling the number of its service life is directly proportional to the relationship, so be sure to choose a good ion exchange resin.
Select the ultrapure water machine suitable for their use, on the one hand, to meet the use of the premise of saving procurement costs, on the other hand, can reduce the operating costs of the later.