From Feedback Method to Establishing Feedforward Method
The water quality of the water source shows a trend of complex pollution, and there is a demand for advanced and strict chlorine treatment and management in water purification processes. The traditional feedback method of seeking appropriate values after chlorine injection has posed health and economic issues. Therefore, it is desirable to establish a feed-forward method that captures the chlorine consumption of raw water in advance and processes it. From sampling to measurement, the system automatically and continuously measures the chlorine demand of all substances in raw water, such as ammonia nitrogen, iron, manganese, and organic matter, in a short time. It can be used as a monitor for surveillance and, in combination with chlorine injection equipment, for accurate chlorine injection control as an automatic proportional injection system. 【Features of the CD-12MF model】 - Improved rotating platinum electrode for residual chlorine detection - No pre-treatment by filtration required for high turbidity samples - Continuous measurement of chlorine demand in raw water - Capable of following rapid changes in raw water quality - Expanded screen size for improved visibility - Easy operation via touch panel - Equipped with USB functionality
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basic information
Measurement target: Chlorine demand of raw water Measurement method: Ultraviolet accelerated continuous electric titration method Measurement range: 0–10 / 0–20 mg/L (ppm) automatic two-stage switching (or 0–15 / 0–30 mg/L (ppm)) Output signal: DC 4–20 mA Response speed: Within 15 minutes (90% response time for a step input of 0→8 mg/L) Ambient temperature: 0–35 °C Ambient humidity: 0–85% Water sampling rate: 6 mL/min Reagent flow rate: 2 mL/min Reagent: 2.5 mol/L sodium chloride solution (50L in reagent tank) Detection electrode: Rotating platinum electrode (2Φ spot type) Reference electrode: Silver electrode (10Φ×4mm) Reaction acceleration: Ultraviolet irradiation method Required water volume: 5 L/min, below 0.2 MPa (approximately 2 kg/cm²) Required power supply: AC 100V, 50Hz/60Hz, 5A Power consumption: Below 500 VA Connection pipe diameter: Water supply inlet VP20A×1 port, drainage outlet VP25A×3 ports Operating weight: Approximately 200 kg Installation method: Indoor floor anchor bolt type (4 bolts)
Applications/Examples of results
Water purification treatment
Detailed information
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- Schematic Diagram Continuously sample the test water, mix it with a reagent (saltwater) that has been electrolyzed to produce chlorine water, and perform ultraviolet irradiation to promote the chlorine consumption reaction of the raw water (reaction tank). Detect the residual chlorine at the outlet of the reaction tank and control the electrolysis current of the chlorine generator to ensure a certain level of free residual chlorine remains, allowing the chlorine generation to follow the changes in chlorine demand of the test water. Calibrate the zero point using distilled water as the test water and the span using a standard chlorine demand solution, then measure the chlorine demand of the unknown test water.
Line up（1）
| Model number | overview |
|---|---|
| C00008301 | Chlorine Demand Meter CD-12MF Type |
Company information
Since our establishment in 1967, we have been committed to the development and dissemination of water quality measuring instruments that anyone can use quickly, easily, and with high precision. In today's world, where effective utilization of the limited resource of water is required alongside environmental conservation, we aim to be a total solution provider that responds to all water environments by leveraging our water quality measuring instruments, technology, and services. Additionally, we are dedicated to utilizing the latest technology and our years of expertise to deliver user-friendly and reliable water quality measuring instruments more affordably, quickly, and widely.