FLD-ISCODT1 Online COD TOC Sensors


The COD sensor is a new generation of environmentally friendly COD/TOC sensor that requires no reagents, no pollution, and is more economical and environmentally friendly. Small size and easy installation, water quality monitoring is available online. Automatic compensation for turbidity disturbances, with automatic cleaning devices, excellent stability even for long-term monitoring.

Measuring principle

Many organic substances dissolved in water absorb ultraviolet light. Therefore, the total amount of organic pollutants in water can be measured by measuring the absorption of these organic substances by ultraviolet light at a wavelength of 254 nm. COD sensors use two light sources, one 254nm ultraviolet light and one 550nm infrared light, which can automatically compensate the optical path attenuation and turbidity effects, thus achieving more stable and reliable measurement values.

COD sensor Feature 

  • Digital sensor, RS-485 output, supports MODBUS.
  • Can measure COD, TOC and temperature parameters.
  • No reagents, no pollution, more economical and environmentally friendly.
  • Small size and easy to install, water quality monitoring can be performed online. 
  • It automatically compensates for turbidity interference and has excellent test performance.
  • Internal rotation cleaning brush for pipe self-cleaning and submersible self-cleaning


COD sensor technical data

Principle  Ultraviolet fluorescence method
COD Measuring range  0.75 to 370mg/L equiv.KHP
COD Resolution  0.01mg/L equiv.KHP
COD Accuracy <5% equiv.KHP
TOC  measure range  0.3 to 150mg/L equiv.KHP
TOC Resolution  0.1mg/L equiv.KHP
TOC Accuracy <5% equiv.KHP
Temperature range 0 ~ 45°C
Power Supply DC12V, current <50mA (when there is no cleaning brush)
Output signal RS485,MODBUS protocol
Calibration method 1 or 2 point calibration
Maximum pressure 1bar
Shell material POM, 316L
Cable length 5M (default)
Response time 10s
Protection grade IP68
Sensor diameter 50mm 
Sensor length 214mm 
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