CL-201 Free Chlorine, Total Chlorine and Active Oxygen Online Analyzer
Model: CL-201
DPD colorimetric online analyzer for high-accuracy free chlorine, total chlorine, residual chlorine, and active oxygen monitoring in drinking water, clean process water, and disinfectant dosing systems.

CL-201
DPD colorimetric online analyzer for high-accuracy free chlorine, total chlorine, residual chlorine, and active oxygen monitoring in drinking water, clean process water, and disinfectant dosing systems.
Best for: Free chlorine and total chlorine monitoring in tap water, circulating cooling water, swimming pool water, and disinfectant dosing processes, Active oxygen monitoring in drinking water, process water, and disinfectant residual control applications, Online disinfectant monitoring in water plants, building water supply, and clean water distribution systems.
Specifications
- Free chlorine range: 0-10 mg/L
- Free chlorine accuracy: 0-5 mg/L: ±5% or ±0.03 mg/L, whichever is greater; 5-10 mg/L: ±10%
- Free chlorine repeatability: ≤5%
- Free chlorine detection limit: 0.03 mg/L
- Total chlorine / total residual chlorine range: 0-10 mg/L
- Total chlorine accuracy: 0-5 mg/L: ±5% or ±0.03 mg/L, whichever is greater; 5-20 mg/L: ±10%
- Total chlorine repeatability: ≤5%
- Total chlorine detection limit: 0.03 mg/L
- Active oxygen range: 0-1 mg/L
- Active oxygen accuracy: ≤±5% or ±0.02 mg/L, whichever is greater
- Active oxygen repeatability: ≤5%
- Active oxygen detection limit: 0.005 mg/L
- Display: 7-inch touchscreen
- Calibration: Factory default calibration curve
- Operating condition: Sample flow: 200-400 mL/min; sample inlet pressure: 0.1-5 bar; sample temperature: 5-40°C
- Power supply: 220 VAC ±10%, 50/60 Hz or DC 24 V
- Output: 4-20 mA
- Communication: MODBUS RS485
- Relay: 2 relays with alarm configuration
- Storage temperature: -15 to 60°C
- Storage humidity: 10-90%, non-condensing
- Size: 350 x 177 x 450 mm (W x D x H)
- Weight: Approx. 16 kg
- Installation: Wall mounted
Applications
- Free chlorine and total chlorine monitoring in tap water, circulating cooling water, swimming pool water, and disinfectant dosing processes
- Active oxygen monitoring in drinking water, process water, and disinfectant residual control applications
- Online disinfectant monitoring in water plants, building water supply, and clean water distribution systems
- Drinking water applications
- Tap water applications
- Swimming pool water applications
- Wastewater treatment applications
- Industrial process water applications
- Circulating cooling water applications
- Disinfection control applications
Benefits
- DPD standard colorimetric method for reliable disinfectant residual measurement
- 7-inch touchscreen display with simple operation and clear interface
- Automatic cleaning, low reagent consumption, and low maintenance workload
- MODBUS RS485 output for automation and remote monitoring
- Built-in data storage, curve display, measurement mode selection, and alarm relay functions
- Supports online measurement of free chlorine, total chlorine, residual chlorine, and active oxygen depending on configuration
Frequently asked questions
What does the CL-201 measure?
CL-201 is configured for Free chlorine range: 0-10 mg/L; Free chlorine accuracy: 0-5 mg/L: ±5% or ±0.03 mg/L, whichever is greater; 5-10 mg/L: ±10%; Free chlorine repeatability: ≤5%; Free chlorine detection limit: 0.03 mg/L.
Where is the CL-201 used?
Typical applications include Free chlorine and total chlorine monitoring in tap water, circulating cooling water, swimming pool water, and disinfectant dosing processes, Active oxygen monitoring in drinking water, process water, and disinfectant residual control applications, Online disinfectant monitoring in water plants, building water supply, and clean water distribution systems, Drinking water applications.
How do I select or order the CL-201?
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