Instrument principle
This automatic monitoring device is developed based on the national standard HJ/T 399-2007 "Determination of Chemical Oxygen Demand in Water Quality - Rapid Digestion Spectrometric Method" and incorporates our company's years of dedicated research and achievements in the field of environmental analysis instruments. It is an intelligent water quality monitoring device. The instrument adopts the classic chromic acid method. In a concentrated sulfuric acid medium, silver sulfate is used as a catalyst, and after high-temperature and high-pressure digestion, the COD value is determined by spectrophotometry.
Application scope
This automatic monitor is widely used for monitoring industrial sewage, domestic sewage, Rivers and Lakes, surface water, tap water and other water bodies.
Technical Parameter

project	specifications	project	specifications
test method	Potassium dichromate rapid digestion spectrophotometric method
Detection range	（0～5000）mg/L	MTBF	≥ 720h/time
accuracy	±10%	communication interface	RS232、（4～20）mA
repeatability	±5%	Insulation impedance	Above 20M Ω
zero drift	±5mg/L	Power Supply	AC（220±22）V，（50±1）Hz，5A
Span Drift	±10%	power waste	150W
Measurement period	（30～50）min	Size	1470mm×550mm×450mm