The study found that organic matter has a maximum absorption value in the ultraviolet region of 254 nm, so the absorbance value of this wavelength can be measured. Suspended matter absorbs visible light at 900 nm, while the absorption machine of organic matter is almost zero, so it can be divided into two channels. The COD value of the water quality can be obtained by measuring the absorption degree of the two paths of light.

COD parameters: (default 485 output) output signal RS485, MODBUS/RTU protocol

Response time

10 seconds T90

Resolution

0.1mg/L or 0.01mg/Lequiv.KHP

COD accuracy

Soil 5% F.S.equiv. KHP

Protection class IP68, water depth 10m

COD range

0.3~370mg/L equiv.KHP

Calibration method

Two point calibration

Repeatability

±1%F.S.equiv.KHP

Turbidity range

0~100NTU

flow rate

less than 3m/s

working conditions

0.1~50℃, <0.1MPa

cable length

5m (default), can be customized