Portable Water Total Nitrogen Meter

I. Product Overview

The instrument is an integrated portable total nitrogen analyser based on alkaline potassium persulfate digestion combined with chromotropic acid spectrophotometry. It is a dedicated device for fast, accurate determination of total nitrogen in water, integrating high-temperature digestion, colorimetric measurement and smart data management. The optimised chromotropic acid disodium colour method offers high sensitivity and strong specificity. A dedicated wavelength light source, preset curves and a dedicated pre-made reagent pack allow the whole workflow from digestion to measurement to be completed with one key press. A high-capacity battery, an independent digestion module and a thermal printer ensure standalone operation at sewage treatment sites and discharge outlets, while wireless transmission and the data cloud platform provide immediate management and traceability of field results.

II. Measuring Principle

Total nitrogen is determined by alkaline potassium persulfate digestion combined with chromotropic acid spectrophotometry. The digestion step follows the national standard method: in the built-in high-temperature digestion module the water sample reacts with the dedicated alkaline potassium persulfate reagent, oxidising all organic and inorganic nitrogen compounds to nitrate. For the measurement step the instrument uses an independently developed chromotropic acid disodium colour method: under specific acidic conditions the nitrate produced by digestion reacts with the chromotropic acid disodium reagent to form a stable yellow complex, and the absorbance of this yellow solution is measured precisely at 420 nm. The absorbance is proportional to the nitrate concentration (that is, the total nitrogen content), and the built-in standard curve is used to calculate and display the accurate total nitrogen concentration directly.

III. Applications

The instrument is dedicated to rapid determination of total nitrogen in water and is used wherever the total nitrogen load must be monitored efficiently. In wastewater treatment and discharge supervision it serves municipal and industrial wastewater treatment plants for monitoring biological nitrogen removal performance, optimising carbon source dosing and ensuring that effluent total nitrogen stably meets discharge standards. In environmental water monitoring it is used for routine eutrophication assessment and early warning of surface water such as rivers, lakes and reservoirs, as well as for enforcement checks and emergency monitoring of outfalls. It is also suitable for research experiments and aquaculture water management.

IV. 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.

V. Technical Parameters

Performance parameters

Physical parameters

Operating environment