Handheld Water COD Meter

I. Instrument Overview

This instrument is a handheld chemical oxygen demand (COD) testing system designed for rapid and accurate on-site determination of COD in water. The system consists of a handheld testing main unit and an accessory case containing a 6-well digestion instrument. The lightweight and portable handheld main unit integrates a dedicated optical channel for COD testing and an intelligent operating system; the independent digestion instrument ensures that sample pretreatment meets the requirements of the national standard method. This split design combines operational flexibility with testing professionalism, enabling operators to efficiently complete the entire workflow from sample digestion to concentration determination in laboratories, plants or on-site environments with power supply.

II. Applicable Standard

HJ/T 399-2007 Water Quality - Determination of Chemical Oxygen Demand - Rapid Digestion Spectrophotometric Method

III. Testing Principle

The testing principle strictly follows the national environmental protection standard HJ/T 399-2007 Water Quality - Determination of Chemical Oxygen Demand - Rapid Digestion Spectrophotometric Method. After a dedicated COD pre-prepared reagent (containing potassium dichromate, sulfuric acid, etc.) is added to the water sample, high-temperature rapid digestion is carried out in the digestion instrument of the accessory case. During this process, reducing substances (mainly organic matter) in the water sample are oxidized by potassium dichromate, and the resulting chromium ions at a specific valence state have characteristic absorption at a specific wavelength. The instrument accurately measures the absorbance at this wavelength through a high-precision optical path system, and automatically matches the built-in standard curve according to the Lambert-Beer law to directly calculate the COD concentration of the water sample.

IV. Applications

This instrument is a professional device dedicated to the determination of chemical oxygen demand (COD). Its application scope focuses precisely on scenarios requiring rapid and accurate assessment of the degree of organic pollution and oxidation demand of water. In the field of industrial wastewater treatment, it is widely used in electroplating, printing & dyeing, pharmaceutical, food and chemical industries to monitor process effluent, evaluate treatment facility efficiency and ensure that the COD at the final discharge outlet stably meets standards. In municipal wastewater treatment plants, it is a key tool for monitoring influent concentration, regulating biochemical treatment processes (such as aeration rate and sludge load) and verifying effluent quality. For environmental supervision and emergency monitoring, environmental protection authorities can rely on its portability and speed to conduct on-site law-enforcement inspections, pollution source screening and emergency assessment of pollution accidents at various outfalls and surface water bodies, quickly determining the organic pollution status. In addition, it is also suitable for rapid COD analysis of batch water samples in the laboratory.

V. Instrument Features

1. Based on the Android operating system, with a beautiful interface and friendly operation;

2. Equipped with a 4.3-inch high-definition touch screen combined with visualized graphical operation pages, greatly improving operational efficiency;

3. Uses high-reliability imported LED light source, requiring no warm-up and offering stable long-term performance;

4. Equipped with a large 10 mm × 10 mm photocell, offering high sensitivity and a low detection limit;

5. The instrument has 16 GB onboard memory and can store more than 10,000 records; an optional Bluetooth printer is available for on-site printing of test results;

6. Features Wi-Fi and Bluetooth, and a USB port for direct connection to a PC for rapid batch data upload;

7. The body is waterproof, and the testing chamber is protected against the intrusion of 0.5 mL of liquid;

8. Uses standard USB-C 5 V 2.1 A supporting the BC 2.1 charging protocol, compatible with third-party mobile phone chargers, charging cables and power banks; features intelligent lithium battery charging management for long-term plug-in use;

9. Bilingual Chinese/English operating system.

VI. Technical Parameters