1COD_Cr Fully automatic online analyzerTresCon COD-3250

（1） Measurement principle

The mixed solution of samples and reagents175℃Under high temperature, complete digestion occurs, and the color of the solution changes. The degree of change depends on the sampleCODThe value is proportional. The optical system measures the absorbance values before and after changes, directly displaying the sample'sCODValue.

（2） Typical Applications

Pollution sources, surface water, municipal sewage, and industrial wastewaterCODOnline monitoring.

（3） Performance advantages

1、 Compliant with relevant national standards, the classic potassium dichromate digestion spectrophotometric method

2、 Adopting negative pressure inhalation method, peristaltic pump tube and reagent/Water sample non-contact, greatly extending service life

3、 Precise optical quantification system ensures accurate quantification of reagents and samples

4、 The measurement interval can be flexibly set for easy operation

5、 Long term stability and accuracy

6、 Equipped with automatic calibration, diagnosis, and alarm functions

7、 Touch screen

（4） Technical indicators

1、 Measurement principle: Classic potassium dichromate digestion spectrophotometric method

2、 Measurement range:(20~1500 mg/L¹)

3、 Accuracy:≥30mg/LWhen,≤The measured values±10%；＜30mg/LWhen,≤ ±5mg/L

4、 Operating temperature:(5~40)℃

5、 Display: Touch screen

6、 Communication interface:(4~20) mA；RS232；(RS485、MODBUS RTUOptional)

7、 Alarm output: optional high concentration/Low limit, water shortage sample or system failure; Equipped with automatic or manual reset

8、 resolving power:0.1 mg/L

9、 Lower limit measurement cycle:35 min

10Measurement interval:(35~9999) minadjustable/integral point/external trigger

11Calibration interval:(35~9999) minadjustable/integral point/external trigger

12Power supply:(220±22) VAC，(50±0.5) Hz

13External dimensions:500mm×370mm×750 mm(Long)×wide×High)

14Additional features: expandable to5000 mg/L

2、 Supporting sample pretreatment system COD 6000

（1） Product Introduction

The pretreatment system is a sample pretreatment device for water quality online analysis instruments, which can be used in conjunction with various water quality online monitoring instruments, effectively protecting the online analysis instruments, greatly reducing the failure rate of the online analysis instruments, and lowering the maintenance costs of the instruments.

The preprocessing system includesPLCCircuit control part (shared with instruments) and water collection and distribution pipeline part. causePLCControl the water pump to collect water samples, which pass through After the first filter removes larger particles and sediment, it enters the second filter to remove suspended fiber impurities. The water sample is stored in the overflow sampler for instrument sampling and analysis. After each sampling is completed, turn off the water pump, create negative pressure in the inlet pipe, and empty the remaining water sample to ensure real-time online characteristics of each sampling.

（2） Technical indicators

1、 Sampling water pump：350W~550WSelf priming pump or submersible pump (single configuration)

2、 internet traffic：(5~10) m³/h

3、 lift：6.5m

4、 ambient temperature：(5~10) m³/h

5、 ambient humidity：10%~90% RH

6、 External dimensions：560 mm ×350 mm ×850 mm(Long)×wide×High) polarographic formula