Portable 4-parameter Water Quality Analyzer

I. Product Overview

This instrument is a highly integrated portable water quality analyser based on spectrophotometry, designed for the simultaneous rapid determination of the four key pollution indicators — chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN) and ammonia nitrogen (NH₃-N). Complex sample pre-treatment (high-temperature digestion) and high-precision optical detection are combined in one unit, with independently optimised optical channels and stored standard curves for each parameter, plus a complete set of pre-prepared reagents. Through an intuitive smart interface the whole process from digestion to measurement is completed with one touch. The design fully meets the need for immediate, interlinked analysis of multi-dimensional water quality data in wastewater process control, comprehensive environmental supervision and field emergency monitoring.

II. Applicable Standards

HJ 535-2009 《Water quality — Determination of ammonia nitrogen — Nessler's reagent spectrophotometric method》
HJ 536-2009 《Water quality — Determination of ammonia nitrogen — Salicylic acid spectrophotometric method》
HJ/T 399-2007 《Water quality — Determination of chemical oxygen demand — Rapid digestion spectrophotometric method》
GB 11893-89 《Water quality — Determination of total phosphorus — Ammonium molybdate spectrophotometric method》

III. Measuring Principle

The instrument strictly follows the national standard spectrophotometric principles and uses mature, reliable methods for each of the four parameters. COD: potassium dichromate high-temperature digestion spectrophotometry — the sample is oxidised by potassium dichromate in a strongly acidic medium and the consumed oxidant is quantified from the change in absorbance of chromium ions at a specific wavelength. Total phosphorus and total nitrogen: both require high-temperature potassium persulfate oxidative digestion. After digestion all phosphorus forms are converted to orthophosphate and determined by ammonium molybdate spectrophotometry (phosphomolybdenum blue or yellow); all nitrogen compounds are converted to nitrate and determined by chromotropic acid disodium spectrophotometry. Ammonia nitrogen: Nessler's reagent or salicylic acid spectrophotometry, forming a pale reddish-brown or blue complex for colorimetric determination. The instrument measures the absorbance of each reaction product at its characteristic wavelength and calculates the concentration from the stored standard curve according to the Lambert-Beer law.

IV. Applications

The four-parameter combination covers the core indicators for evaluating organic pollution and eutrophication. Comprehensive monitoring of wastewater treatment processes: widely used in municipal and industrial wastewater treatment plants as a core tool for monitoring biological system performance (COD removal) and nitrogen and phosphorus removal (TN, TP, NH₃-N), providing immediate data for process optimisation such as carbon source and chemical dosing and ensuring that effluent reliably meets the standards. Comprehensive assessment and supervision of water environment quality: suitable for routine monitoring, eutrophication assessment and early warning of rivers, lakes and reservoirs; environmental authorities can use it for integrated enforcement inspection of outfalls, pollution source tracing in catchments and rapid emergency monitoring of sudden water pollution incidents, obtaining a key pollution profile in a single pass. Other applications: aquaculture management, agricultural non-point-source pollution surveys, research analysis and enterprise self-monitoring.

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 and 6-position cooling fan with independent control for rapid digestion and cooling.

3. Measurement, digestion and cooling can be carried out simultaneously, greatly improving efficiency.

4. Factory-prepared reagents are supplied: simply add the water sample to the tube.

5. Favourite parameters can be pinned to the top of the item list, avoiding repeated searching.

6. Portable all-in-one design with a large-capacity lithium battery: digestion and measurement can both be carried out in the field with a single instrument.

7. Built-in thermal printer supporting automatic and batch printing, freely selectable and editable print content, and QR-code printing.

8. Built-in instructional videos let users watch the procedure while operating the instrument.

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

10. Data cloud platform for online storage and short- and long-term trend analysis.

11. GPS positioning displays the longitude, latitude and landmark of the sampling point in real time; the coordinates are saved with the data and can be uploaded to the cloud platform.

VI. Technical Parameters

Performance parameters

Physical parameters

Operating environment