Disinfection Analyzer
Free Chlorine Analyzer

SMR03 series

Free Chlorine Analyzer

The Free Chlorine Analyzer is connected directly via RS485 communication interface, providing simple, reliable, cost-saving process data with remote monitoring, calibration, configuration and diagnostics capabilities.
Free Chlorine meter in a robust IP68 proof enclosure, 1500 N tensile strength Kevlar reinforced cable, up to 1.2 km digital data transmission, the transmitter is ideally used in water/wastewater industry.
  • Robust IP68 Water Submersible Enclosure, Solution Without Cabinet
  • On-line Realtime Measurement
  • Ultra Low Power Consumption, Ideal for Outdoor Applications
  • Temperature Compensation
  • No Moving Parts, High Reliability, Drift Free
  • Surge Protection for Power and RS485 Communication
  • 1.2 Km RS485 Digital Communication, Minimize Cabling and Engineering Cost
  • Software Configuration Calibration and Data Monitoring
  • Standard Modbus RTU Protocol, Direct Connected with PLC, HMI, Eliminate I/O Module Cost
  • Auto Cleaning, Almost No Maintenance
  • No Reagent and Membrane, Almost No Consumable
  • Not Affected by Pressure Fluctuation(1~15kg f/cm2)
  • pH Compensation (pH 5-9)
  • Built-in Flow Regulator and Flow Indicator
  • Integration Additional Sensors such as Conductivity or ORP
  • Onboard memory allowing users to easily calibrate and configure sensor at lab and distribute to various fields sites
SMR03-1/2 Free Chlorine Analyzer 
Measurement range 0~5 mg/L
Accuracy 0.01 ppm (0~0.5 ppm)
0.02 ppm (0.5~2 ppm)
Resolution 0.01 mg/L
Repeatability ±1% FS
Temperature compensation 0~85 °C
Automatic pH compensation 5-9 pH (SMR03-2)
First setup time 4 hours
Process flow rate Min. 0.8 l/min
Auto cleaning rotating glass ball
Electrode material platinum (cathode), copper (anode)
Operating pressure 0~10 Kgf/cm2
Operating temperature 0~85 °C
Response time 3 secs
Protection IP68
Housing Acrylic
pH Sensor
Measurement range 0 ~14 pH
Accuracy ±0.05 pH
Resolution 0.01 pH
Repeatability ±0.01 pH
Temperature Sensor pt1000
Measurement range 0 ~ 60 °C
Accuracy ±0.5°C; ±0.1°C (optional)
Dimension 350(W)x320(H)x155(D) mm
Weight Free chlorine and pH analyzer: approx. 1.5 Kg
cable: 80 g/m
Typical Application
Drinking water, stormwater groundwater, industry, water treatment, wastewater,
gas petrochemical
  • Output Signal: RS485 (Modbus RTU protocol), 19,200 bps, 8 data bits, no parity, 1 stop bit; 4~20 mA
  • Data Resolution: 16 bits (0.001% FS)
  • Surge Protection: 4000 V DC
  • Power: input: DC 3.6~5 V, 20 mA
  • Protection: polarity, overload, short circuit
  • Safety: CE, FCC
  • Drinking water, stormwater groundwater, industry, water treatment, wastewater, gas petrochemical
Measurement Method
  • SMR03-2: The amperometric electrode measurement cell consists of two combination probes that uses a platinum anode and a copper cathode electrode to amperometrically measure free residual chlorine, There is no need for chemical reagents, and the glass balls inside rotates continuously to remove the hydrogen gas from the electrodes.An electrochemical reaction occurs within these electrodes, based on the available chlorine concentration, generating a propotional current. The whole unit includes flow indicator, free chlorine electrode and mounting plate. Optional pH and temperature sensors for compensation are available. SMR03-3: The hypochlorous acid (Hocl) contained in the medium diffuses the sensor membrane and is reduced to chloride ions (Cl-) on the gold cathode. On the silve anode, silver is oxidised to silver chloride. The current is proportional to the free chlorine concentration.
Standard cable length is 3 m, customized length is available upon request