Product Information
Intelligent Online Free Chlorine Monitor System with CS4 Sensor for Tap Water
Application Fields
Tap water: 0 - 2mg/L;
Swimming pool water: 0 - 5mg/L for the measurement of cyanuric acid;
Medical water: 0 - 0.5mg/L; with a conductivity as low as 10μS/cm;
Sewage treatment: 0 - 20mg/L;
Fruit and vegetable disinfection: 0 - 200mg/L;
Seawater: with a conductivity as high as 50mS/cm;
High - salt seawater: brine or seawater with a concentration greater than 3.5% (>50mS), and the salt content can be up to approximately 26%;
Pipeline disinfection: 0 - 2.5mg/L with a water temperature as high as 70℃;
Industrial water treatment: 0 - 2000mg/L, etc.
Functional Features
Standard - equipped with imported sensors, ensuring accurate measurement and stable performance.
One-key calibration, historical data recording and export.
Standard MODBUS RTU communication protocol.
Dual high-impedance pre-amplifiers: High input impedance, noise-proof, and strong anti-interference ability.
Stable zero-point. Only one-point calibration is required on-site, and multiple calibration methods are also provided.
Human-machine interaction: Menu-based operation structure, allowing users to operate following the on-screen prompts.
Multi - parameter display on the same screen: Simultaneously display the main measured value, pH value (optional), current output, and working status.
Two-way output signals: The software can select from three output modes: 4 - 20mA / 20 - 4mA / 0 - 20mA.
Free setting of the measurement range and alarm upper and lower limits; High and low limit over-range alarm prompts.
Three sets of relay control switches with an adjustable hysteresis control range.
Self - set password: Users can set or modify passwords to avoid misoperation.
Technical Parameters
Specification | Detailed information | |
Measurement | Measurement Parameters | Chlorine , pH (optional) |
Measuring Ranges | 0.005～0.500mg/L;0.005～2.000mg/L;0.05～5.00mg/L;0.05～10.00mg/L;0.05～20.00mg/L;0.5～200.0mg/L0.03～2.5mg/L；20～2000mg/L（special application） | |
Lower Limit of Measurement | 0.005mg/L | |
Resolution | 0.001～1mg/L（depending on the measuring range） | |
Accuracy (@25℃, pH 7.2) | In the measurement range of 0 - 1ppm, when calibrated at 0.5ppm, the error is ±2% of the measured value or ±0.03ppm.（take the larger one） | |
In the measurement range of 1 - 2ppm, when calibrated at 1.5ppm, the error is ±2% of the measured value or ±0.03ppm.（take the larger one) | ||
In the measurement range of 0 - 10ppm, when calibrated at 5.0ppm, the error is ±2% of the measured value or ±0.3ppm.（take the larger one) | ||
In the measurement range of 10 - 20ppm, when calibrated at 15.0ppm, the error is ±5% of the measured value or ±0.5ppm.（take the larger one) | ||
Response time | T90≈2 minutes | |
Drift | Approximately - 1% per month (after calibration at 25℃ and pH = 7.2) | |
PH range | 4.0 - 12.0 (depending on the electrode) | |
Maintenance Cycle | ≥90days | |
Conductivity range | 10μS/cm - 50mS/cm (Special applications for values > 50mS/cm) | |
Electrical | Display | LCD liquid - crystal screen |
Data Storage | It has an automatic storage function and data protection in case of power failure. In total, it can store 110,000 pieces of data. | |
Power supply | 105～235VAC，50±1Hz/24VDC±5%(DC is optional) | |
Power | ≤3W（including the sensor） | |
Analog Output | Two-way analog output, with optional signals: 4 - 20mA / 20 - 4mA / 0 - 20mA (load resistance < 500Ω) | |
Digital output | RS485 interface, MODBUS RTU protocol | |
Relay output | Three-way relay 3A 250VAC; 3A 28VDC or 120VAC | |
Physical prosperities | Material | Powder - coated steel plate |
Size | 300*250*165mm（H*W*D） | |
Weight | 6kg | |
Waterway interface | 2-inch or 3-inch hose （custom made） | |
Ambient performance | Flow rate | In flow chamber：250～500mL/min |
Protection level | IP43 | |
Water pressure | ≤6 bar（matching a pressure - reducing valve with the instrument） | |
Working humidity | <90%，no condensation | |
Working temperature | Instrument：-15℃～50℃；senseor water temperature：0.1℃～45℃（0.1°C to 70°C for special applications） | |
Storage temperature | Instrument：-20°C～60°C；sensor：0.1°C～55°C | |
FAQ – Frequently Asked Questions
1. Where are your products manufactured?
Our products are proudly designed and manufactured in China, following international quality standards and certified processes.
2. Can you provide OEM/ODM services for international clients?
Yes, we offer customized solutions and private labeling to meet your brand’s needs worldwide.
3. Are your products compliant with international safety and quality standards?
Absolutely. Our products are tested to meet CE, RoHS, and other international certifications.
4. How do you handle shipping and delivery for overseas orders?
We cooperate with major international couriers to ensure fast and reliable delivery to your location.
5. Can I get product samples before placing a large order?
Yes, we provide samples so you can evaluate product quality before committing to bulk orders.
6. What is the typical lead time for production and delivery?
For standard products, we usually ship within 5–7 days after order confirmation. Customized products may take slightly longer.
7. How do you support clients after the purchase?
We offer 24/7 technical support, product guidance, and warranty service to ensure smooth operation.
8. Do you provide support for international clients after purchase?
Yes, we offer remote technical assistance, manuals in English, and prompt solutions to any issues, ensuring smooth use worldwide.
9. How can I place an order if I am located overseas?
You can contact our sales team directly via email or website inquiry. We provide professional guidance throughout the ordering process.
10. Why should I choose your company over other suppliers in China?
We combine over 30 years of manufacturing experience, advanced technology, strict quality control,
and global customer service to deliver reliable, high-quality solutions.
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