Portable Water COD Meter

I. Product Overview

This instrument is an integrated portable COD analyser based on the national standard spectrophotometric method. It is a dedicated, reliable device that integrates high-temperature digestion, optical measurement and smart data transmission. A dedicated wavelength light source and preset standard curves are built in, and with the COD-specific pre-made reagents a single key press completes digestion and measurement so the COD concentration is read directly. The design centres on efficient on-site testing for rapid, accurate chemical oxygen demand analysis in wastewater treatment and environmental supervision. A high-capacity battery, an independent digestion module and a thermal printer allow the whole workflow to be completed independently in the field or outside the laboratory, while 4G/Wi-Fi wireless transmission and the data cloud platform close the loop from on-site testing to report generation and data management.

II. Applicable Standards

1. HJ/T 399-2007 Water quality — Determination of chemical oxygen demand — Rapid digestion spectrophotometric method

III. Measuring Principle

Chemical oxygen demand is determined by the potassium dichromate spectrophotometric method specified in the national standard. Its core is a built-in optical system at specific wavelengths, optimised for the COD colour reaction. During testing the water sample is fully digested and oxidised in the dedicated COD pre-made reagent (containing potassium dichromate and sulfuric acid) in the built-in high-temperature digestion module. In this process the reducing substances in the sample (mainly organic matter) are oxidised by potassium dichromate, and the amount of oxidant consumed is proportional to the concentration of the specific valence state chromium ions produced, which show a characteristic colour. The high-precision optical system then measures the change in absorbance of the coloured solution at a fixed wavelength and, strictly following the Lambert-Beer law, automatically matches the stored standard working curve to calculate the accurate COD concentration directly.

IV. Applications

The instrument is dedicated to determination of chemical oxygen demand and focuses on all scenarios that require rapid, accurate assessment of the organic pollution level and oxidation demand of water. In industrial wastewater treatment it is widely used in electroplating, printing and dyeing, pharmaceutical, food and chemical industries to monitor process effluent, evaluate treatment efficiency and ensure stable compliance at the final outfall. In municipal wastewater treatment plants it is a key tool for monitoring influent concentration, regulating biochemical processes such as aeration rate and sludge load, and verifying effluent quality. For environmental supervision and emergency monitoring, its portability and speed allow authorities to carry out on-site enforcement checks, pollution source screening and emergency assessment at outfalls and surface water bodies. It is also suitable for rapid batch COD analysis of water samples in the laboratory.

V. Key Features

1. Android 7.1.1 smart operating system for a smoother interactive experience, faster response and greater stability.

2. Built-in 6-position digester with a 6-position cooling fan, independently controlled for rapid digestion and cooling.

3. Detection, digestion and cooling can run simultaneously, greatly improving efficiency.

4. Portable all-in-one design with a built-in high-capacity lithium battery: digestion and measurement can both be completed in the field.

5. Factory-prepared reagents: simply add the water sample to the tube to start the measurement.

6. Built-in thermal printer with automatic and batch printing, editable print content and QR code support.

7. Built-in instructional videos: users can follow the demonstration while operating, which makes learning much easier.

8. Wi-Fi and 4G modules for wireless data upload.

9. Data cloud platform that receives measurement data for online storage and short- and long-term trend analysis.

10. GPS positioning shows the longitude, latitude and landmark of the measuring point in real time; the position is saved with the data and can be uploaded to the cloud platform.

VI. Technical Parameters

Performance parameters

Physical parameters

Operating environment