Target disinfectant
Specify free chlorine, total chlorine, chlorine dioxide or the required combination.
Browse by parameter
Online residual chlorine analyzers
Control disinfection using continuous free chlorine, total chlorine or chlorine dioxide measurement matched to the water chemistry and sample system.
Cl₂Residual chlorine measurement
01
The disinfectant and sample chemistry matter
Free chlorine, total chlorine and chlorine dioxide are not interchangeable measurement targets. Selection depends on the disinfectant, concentration range, sample pH, conductivity, temperature and whether a controlled flow-cell installation is available.
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Confirm these conditions before selection
Concentration range
Provide normal dosing concentration and the maximum expected level.
Sample chemistry
Confirm pH, conductivity, temperature and whether the sample is freshwater or seawater.
Flow and calibration
Plan the flow cell, stable sample flow and reference test used for slope calibration.
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Typical applications
Drinking-water disinfectionDistribution monitoringSwimming poolsCooling waterWastewater disinfectionSeawater applications
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Five verified FUNEL analyzers
CL-201
Free / total chlorine and active oxygen analyzer
DPD colorimetric analyzer with automatic cleaning and a 7-inch touchscreen.
Verified facts- DPD colorimetry
- 0–20 mg/L total chlorine
- 0.005 mg/L active-oxygen detection
PDCL-400
Free chlorine / chlorine dioxide analyzer
Constant-voltage amperometric measurement for clean-water and pool applications.
Verified facts- 0–2 mg/L; 0–20 mg/L optional
- Sample pH 5–8
- 30–60 L/h flow
PDCL-500M
Micro-MEMS disinfectant analyzer
Compact electrochemical sensor for treated water and secondary-supply projects.
Verified facts- 0–2 / 0–5 mg/L
- 0.01 mg/L resolution
- Conductivity ≥100 µS/cm
PDCL-700
Covered-membrane free chlorine analyzer
Three-electrode free-chlorine configuration designed to reduce pH effects.
Verified facts- 0.05–20.00 mg/L
- Sample pH 4–9
- IP68 sensor
PDCL-600
Composite-membrane disinfectant analyzer
Digital membrane electrode for free chlorine, total chlorine or chlorine dioxide configurations.
Verified facts- 0–2 / 0–20 / 0.5–200 mg/L
- DPD-1 slope calibration
- 4–20 mA / Modbus RS485
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Residual chlorine selection questions
Can one sensor measure every chlorine parameter?+
No. The exact sensor configuration must be selected for free chlorine, total chlorine or chlorine dioxide and the relevant sample conditions.
Why is sample flow important?+
The membrane or amperometric measurement requires a stable sample condition. The specified flow cell and flow range help maintain repeatable readings.
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