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Conventional Pollution Online Monitoring Instrument
COD ammonia nitrogen 2-in-1 online analyzer
product details

System Overview


COD-NH3N-8000-COD ammonia nitrogen 2-in-1 online analyzer is a new generation of online analyzer in line with domestic standards and industry standards. The instrument and the realization of an instrument can simultaneously determine the chemical oxygen demand (COD) in water and ammonia nitrogen in water, and the online determination of the two pollution factors are in line with the current national standards and industry requirements, saving the user 50% of the use cost.

Potassium dichromate was used for high temperature digestion and colorimetric determination. The analytical process and results were in line with the national standards and industry requirements of GB11914-89 and HJ/T399-2007. The on-line ammonia nitrogen analyzer adopts the method of Knoll reagent or salicylic acid optical colorimetric determination. The analysis process and analysis results meet the national standards and industry requirements of HJ536-2009 and HJ/T101-2003.


System Features


· Simultaneous determination of chemical oxygen demand (COD) and ammonia nitrogen content in water;

· Two-in-one monitoring of COD and ammonia nitrogen, saving 50% of the use cost;

· Flexible calibration of standard solution to ensure high accuracy;

· Unique optical quantitative algorithm ensures high repeatability;

· The flexible setting of reaction time ensures that any water sample can be accurately monitored;

· Long service life of the injection pump, only need to replace the syringe once a year;

· The external sampling adopts two ways: submersible pump and self-priming pump;

· Online monitoring methods are diversified, which can realize manual measurement at any time, automatic timing measurement, automatic periodic measurement and other measurement methods.

· Advanced self-diagnosis, alarm system, when the sample suddenly interrupted, there is a prompt signal.

· Simple operation and maintenance.


Technical Parameters


Measurement methods: chromium method, Knoll reagent method or salicylic acid method;
Test range: COD (0-1000) mg/L;

Ammonia nitrogen: (0-50) mg/L;

Accuracy: COD measurement <10% when concentration >100mg/L, <±6mg/L when concentration <100mg/L;

the concentration of ammonia nitrogen was <10% when the concentration was >10mg/L, <±1mg/L when the concentration was <10mg/L;

Repeatability: the COD measurement is <5% when the concentration is >100mg/L, <±5mg/L when the concentration is <100mg/L;

the concentration of ammonia nitrogen was <5% when the concentration was >10mg/L and <±1mg/L when the concentration was <10mg/L;

Response time (>90%) : can be adjusted according to the water sample, at least 15min;
Test method: timing, equal interval, manual, continuous measurement;
Correction mode: automatic timing correction or manual correction;
Pretreatment maintenance: automatic cleaning, or manual cleaning;
Daily maintenance: clean the filter of the external sampling pump every three months;

clean the quantitative tube every six months or choose to replace the quantitative tube;

The syringe and digestion tank can be replaced once a year;

replace the filter module in the pretreatment unit once a year;

Self-test system: self-monitoring of leaks;

Instrument status self-diagnosis;

Analog output: 4– 20mA analog output;
Relay control: 2 24V 1A relay high and low point control;
Data transmission mode: 4-20 mA, RS232, RS485, GPRS;
Display: 8.0 inch LCD display, touch screen, resolution 800×600;
Data storage: five years of valid data;
Operating temperature: +0 ~ +40°C;
Power supply: 220 VAC ±10%/50-60Hz;
Power consumption: about 100W;
Size: 590×700×360mm;
Weight: about 35kg.