A laboratory ultrapure water machine is a water purification device for laboratory use, which removes all solid impurities, salt ions, bacteria, viruses, etc., from water through methods such as filtration, reverse osmosis, electrodialyzers, ion exchangers, and UV sterilization.
Laboratory ultrapure water equipment is widely used in industries such as pharmaceuticals, electronics, chemicals, and biological and physical laboratories. Laboratory ultrapure water machines typically produce both pure water and ultrapure water.
Working Principle of Laboratory Ultrapure Water Machines
The working principle of a laboratory ultrapure water machine involves pretreatment of tap water through precision filter cartridges and activated carbon filter cartridges to filter out particles like sediment and adsorb odors, making the tap water cleaner. Then, the water undergoes purification and desalination via a reverse osmosis device. The purified water is stored in a storage tank, meeting the national三級(jí) water standard, while the wastewater from the reverse osmosis device is discharged. Reverse osmosis pure water is further desalinated through a purification column to obtain Grade I water or ultrapure water. Finally, if there are special requirements, UV sterilization or microfiltration, ultrafiltration, etc., are added after the ultrapure water stage to remove residual bacteria, particles, pyrogens, etc. Precision filter cartridges, activated carbon filter cartridges, reverse osmosis membranes, and purification columns are materials with relatively limited lifespans. The precision filter cartridge and activated carbon filter cartridge actually protect the reverse osmosis membrane.
The principle and steps for preparing ultrapure water with an ultrapure water system are roughly as follows:
1. Feed water: Tap water, ordinary distilled water, or ordinary deionized water can be used as feed water.
2. Mechanical filtration: Removes mechanical impurities such as rust and other suspended solids through sand core filter plates and fiber columns.
3. Activated carbon filtration: Activated carbon is a broad-spectrum adsorbent that can adsorb gas components, such as residual chlorine in water, as well as bacteria and certain transition metals that can damage the reverse osmosis membrane. Therefore, every effort should be made to remove them completely.
4. Reverse osmosis membrane filtration: Filters out over 95% of electrolytes and macromolecular compounds, including colloidal particles and viruses. The removal of most ions significantly extends the lifespan of the ion exchange column.
5. UV digestion: Uses short-wave (180nm-254nm) ultraviolet radiation to break down small organic compounds that are not easily adsorbed by activated carbon, such as methanol and ethanol, converting them into CO2 and water to reduce the TOC level.
6. Ion exchange unit: Mixed ion exchange beds are known to be the decisive means of removing ions from water. Obtaining ultrapure water through multi-stage mixed beds is not difficult. However, the TOC level of the water mainly comes from the resin bed. Therefore, high-quality ion exchange resin becomes the key to success. High-quality resin refers to resin with excellent chemical stability, no decomposition, and free of oligomers, monomers, and additives. So-called "nuclear-grade resin" likely falls into this category. The higher the quality of the resin, the better.
7. 0.2μm membrane filtration: Removes particles in the water to 1 per milliliter (smaller than 0.2μm). The water produced after the above steps is ultrapure water and should meet the requirements for various instrumental analyses, high-purity analyses, and measurements.

The principle and steps for preparing ultrapure water with an ultrapure water system are roughly as follows:
1. Feed water: Tap water, ordinary distilled water, or ordinary deionized water can be used as feed water.
2. Mechanical filtration: Removes mechanical impurities such as rust and other suspended solids through sand core filter plates and fiber columns.
3. Activated carbon filtration: Activated carbon is a broad-spectrum adsorbent that can adsorb gas components, such as residual chlorine in water, as well as bacteria and certain transition metals that can damage the reverse osmosis membrane. Therefore, every effort should be made to remove them completely.
4. Reverse osmosis membrane filtration: Filters out over 95% of electrolytes and macromolecular compounds, including colloidal particles and viruses. The removal of most ions significantly extends the lifespan of the ion exchange column.
5. UV digestion: Uses short-wave (180nm-254nm) ultraviolet radiation to break down small organic compounds that are not easily adsorbed by activated carbon, such as methanol and ethanol, converting them into CO2 and water to reduce the TOC level.
6. Ion exchange unit: Mixed ion exchange beds are known to be the decisive means of removing ions from water. Obtaining ultrapure water through multi-stage mixed beds is not difficult. However, the TOC level of the water mainly comes from the resin bed. Therefore, high-quality ion exchange resin becomes the key to success. High-quality resin refers to resin with excellent chemical stability, no decomposition, and free of oligomers, monomers, and additives. So-called "nuclear-grade resin" likely falls into this category. The higher the quality of the resin, the better.
7. 0.2μm membrane filtration: Removes particles in the water to 1 per milliliter (smaller than 0.2μm). The water produced after the above steps is ultrapure water and should meet the requirements for various instrumental analyses, high-purity analyses, and measurements.
Features of XINRUI Water Treatment Ultrapure Water Instruments
1. Equipped with a complete purification unit, it uses tap water as feed water and produces pure water and ultrapure water as output. It produces water of different standards to meet the water needs of various laboratories.
2. The new laboratory ultrapure water machine produces 40 times more ultrapure water per unit than similar imported products, with a water production cost one-fiftieth of other products.
3. If the feed water quality is less than 2000μs and hardness ≦450ppm, the produced water quality can be stably maintained below 5μs/cm, and the feed water utilization rate can reach 60%-80%.
4. Users can also quantitatively draw pure water and ultrapure water. By setting the desired amount, the ultrapure water machine will automatically produce the appropriate quantity of water. The draw volume can be freely set from 10 milliliters to 200 liters, with quantitative drawing accuracy of ±2ml.
5. Users can store and query data in real time through the fully intelligent monitoring system, enabling trend analysis. The fully intelligent monitoring system supports multiple languages and multiple users, with separate data recording.
6. True-color LCD touch screen with a graphical human-machine interface allows one-step operation and online information query. All monitoring data of the entire system is collected in real time and can be viewed online without the need for an external computer for storage. Data storage capacity exceeds one year.
7. Reasonable placement of consumables in the purification unit and plug-and-play components facilitate calibration, maintenance, cleaning, disinfection, and sampling during system validation.
Performance Features of the RUPC Series Ultrapure Water Machines
■ Large color touch screen display and user-friendly interface allow full monitoring of the instrument's working status and real-time data.
■ Fully automatic control, low-pressure alarm shutdown protection, and automatic stop of water production when the tank is full.