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Free Chlorine Analyzer with pH

  • Waterworks Treatment and Distribution
  • Wastewater Tertiary Discharge
  • Industrial Water


  • Compliant with EPA Method 334.0 amperometric Free Chlorine analysis
  • Low maintenance costs
  • Real-time measurement
  • Specialized electrode protection technology with membrane cap
  • pH auto compensation function calculates accurate free chlorine concentration
  • Extremely short polarization time, 30 minutes to 90% of signal strength

Free Chlorine Sensor

Reference Electrode Surface Coating with ion-permeable polymer film

Differential pH Sensor

Reference Electrode Surface Coating with ion-permeable polymer film

Product Specifications


Controller System Performance

EnclosureNEMA 4X (IP65), Panel-mount / Wall-mount
Display4.3 TFT Color Touch LCD
Sensor ConnectionsPlug & Play, 1st Sensor standard, 2nd Sensor Optional
ParametersTurbidity, Free Chlorine, pH, Conductivity & Temperature
Power110/220 VAC, 50/60 Hz
Outputs3 x 4-20 mA, 3 x Relays
CommunicationsRS232/RS485 Modbus, USB Port, SD Card Slot

Operational Environment

Temperature Range-5°C to 50°C (Water Temperature),
-20°C to 60°C (Air Temperature)
Flow Range200-500 mL/min

Calibration & Options

Auto CompensationTemperature auto compensation, pH 4~9 auto compensation
CalibrationZero Calibration, Span Calibration


Sensor Measurement System Performance

Measurement MethodPolarographic Amperometric Method (Reagent-less)
Measurement Range0 ~ 2/10/20 mg/L
Resolution0.001 mg/L
Accuracy±0.01 mg/L
Measurement Unitsmg/L (ppm), Temperature (°C, °F)
Response Time90%, Within 90 Seconds

Materials of Construction

Chlorine ElectrodeElectrode Protection by membrane cap
Chlorine SensorElectrode: Cathode - Gold, Anode - Silver (Anodizing) Membrane: PTFE
pH ElectrodeDifferential type with built-in salt bridge
Temperature ElectrodePlatinum Thermometer (PT1000Ω)
Sensor HousingsWaterproof (IP68), Acetal (corrosion and chemical resistance)