1、 Overview
The HJCODet-5000 COD online automatic monitor is an intelligent and automated instrument that monitors the concentration of chemical oxygen consumption in water quality in real time. This instrument is based on the principle of rapid digestion spectrophotometric colorimetric method for detecting COD, which automates the detection process and greatly saves manpower and material resources. The detection results are fast and accurate, suitable for monitoring the COD content in wastewater from enterprises, various water sources, and industrial production processes. The instrument can upload data to the control room for real-time viewing by laboratory personnel.

2、 Technical indicators
Execution standard: GB 11914-1989 Determination of Chemical Oxygen Demand in Water Quality - Dichromate Method;
HJ/T377-2007 Technical Requirements for Environmental Protection Products - Chemical Oxygen Demand (CODcr) Water Quality Online Automatic Monitoring Instrument;
Measurement range: 5~200mg/l, 5~1000mg/l, 5~2000mg/l, 5~5000mg/l four ranges can be freely selected, and the range can also be customized according to customer needs (maximum 5~40000mg/l);
Measurement accuracy: ± 10%;
Resolution:< 1mg/l；
Repetitive error: ＜ 5%；
Detection cycle: continuous, 1h, 2h, 3h 24 hours, triggering three types of sampling;
Anti chloride ion interference: below 40000mg/l is acceptable;
Mean time between failures: ≥ 720h/time;
Range drift: ± 5% F.S
Instrument calibration: manual/automatic (1-7 day interval optional);
Cleaning time: manual/automatic (1-7 day interval optional);
Injection method: Peristaltic injection, equipped with a quantitative analyzer;
Display unit: human-machine interface, 7-inch color high-definition touch screen;
Storage unit: 20000 pieces of data, not lost in case of power failure, automatically overwrite the earliest data when full (can add 40000 pieces of data)
Communication interface: 1 RS232 or RS485 digital interface, supporting MODBUS communication protocol or custom protocol
1 analog signal 4-20mA;
Printing interface: can be connected to an external industrial micro printer (optional);
Dimensions: 600 × 450 × 1610 (mm);
Weight: 80kg;
Power supply: AC 220V ± 20%, 50Hz; Environmental temperature: 5-40 ℃ Environmental humidity: ≤ 85%

3、 Functional Features
1. The instrument has a Chinese environmental protection product certification certificate and a testing report from the Quality Inspection Center of the Ministry of Environmental Protection. The testing results of the instrument have legal validity;
2. Wide detection range, suitable for various municipal and industrial wastewater imports and exports;
3. Strong anti-interference ability, equipped with a preprocessing system and anti chlorine interference design, ensuring accurate and reliable detection results.
4. Constant temperature stability, ensuring complete oxidation of the sample, fast heating of the heating unit, and long lifespan.
5. Support the function of querying historical data, trend charts, alarm records, and calibration parameters, without losing data during power outages.
6. Complete communication interfaces, convenient for connecting with flow meters, central control platforms, data acquisition instruments and other equipment;
7. Support any operation on the instrument that can be queried in the operation log;
8. It has service functions such as cleaning, calibration, emergency stop, etc;
9. It has the function of exceeding the standard alarm prompt, and can be connected to the platform to achieve the function of sending alarm signals.
10. The instrument process is automated, with maintenance intervals greater than one month, low reagent consumption, and low cost, which is popular among enterprise users.