Control method of the EDI ultra-pure water equipment system:

The control methods of the EDI ultra-pure water equipment system include manual and automatic options, capable of meeting the following requirements:

Automatic Refilling of the Water Tank: The water tank is automatically refilled when the water level reaches the low position, and refilling stops when it reaches the high position.

2. The system activates when the water tank reaches a certain level, and stops when the pure water tank is full.

3. When the water tank is at low water level, activate the low water protection. The cold water machine and system will cease operation entirely. Both manual and automatic operations cannot be performed.

4. The reverse osmosis system undergoes a startup cleaning each time it powers on, with the cleaning duration set around 30 seconds (adjustable), and a scheduled cleaning is performed after the system has been running for a period (adjustable duration).

5. When the pretreatment pressure does not reach 2 kg, the reverse osmosis main unit is protected against low pressure.

6. The water softener undergoes an automatic regeneration process after operating for 72 hours.

6. When the pure water tank is low on water, the EDI system will not operate.

7. When the ultra-pure water tank is full, the EDI membrane stack stops operating.

8. The EDI membrane stack is controlled by the EDI concentrated water flow switch. The stack will automatically shut down when the flow does not meet the requirements.

How EDI Works

EDI membranes and reverse osmosis membranes are quite different. Reverse osmosis membranes allow small particle molecules, pollutants, and ions as well as water to pass through, while EDI membranes, like ion exchange resins, are made of polyphenylene material and only permit ions with appropriate charges to pass through, with water largely unable to pass. The resin is continuously regenerated through separation in water. In an electric field, water molecules in the water are separated into H+ and OH- ions, attracted to opposite charges. High-pressure chillers move H+ ions towards the cathode via the anion resin and OH- ions towards the anode via the cation resin. This migration of H+ and OH- regenerates the resin, and maintenance of the chillers is required. The anion membrane allows H+ to pass into the concentrated water chamber, while the cation membrane allows OH- to pass and also enters the concentrated water chamber, where H+ and OH- combine to form the produced water. The flow of water in the concentrated water chamber carries away the positive and negative ions. The membrane prevents ions with opposite charges from entering the freshwater chamber. As the water flows through the freshwater chamber, ions are removed by the resin, resulting in the production of pure water in the effective side (freshwater chamber).

Ultra-Pure Water Machine Technical Explanation

This water treatment equipment utilizes pretreatment, reverse osmosis technology, ultra-pure treatment, and post-treatment methods to almost completely remove conductive media from water, as well as colloidal substances, gases, and organic matter to a very low degree. The ultra-pure water machine is also known as: ultra-pure water generator, ultra-pure water system, precision chiller, ultra-pure water meter, ultra-pure water system, laboratory ultra-pure water generator, etc. The resistivity of the ultra-pure water produced by the ultra-pure water machine should generally be greater than 10 megohms, water with a resistivity of 10 megohms or more is considered ultra-pure. The high-quality ultra-pure water output can reach 18.25 megohms.

As an essential source of water for daily experiments, ultra-pure water systems are highly utilized lab equipment. A thorough understanding of their common malfunctions and solutions will greatly enhance our experimental efficiency.

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