Handheld Water COD, Ammonia Nitrogen and Total Phosphorus Meter

I. Product Overview

This product is a handheld COD, ammonia nitrogen and total phosphorus three-parameter water quality testing system, designed for simultaneous on-site determination of three key pollution indicators. The system comprises a handheld main unit and a multi-purpose accessory case: the main unit integrates an intelligent detection module and switches between the three parameters with one key for colorimetric analysis, while the 6-position digester in the accessory case supports the digestion pre-treatment required for COD and total phosphorus. Operators can therefore rapidly assess organic pollution (COD), nitrogen pollution (ammonia nitrogen) and phosphorus pollution (total phosphorus) on a single platform, meeting the multi-parameter requirements of complex water quality scenarios.

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 adopts the spectrophotometric principle and determines each parameter according to the corresponding national standard method. COD: potassium dichromate high-temperature digestion spectrophotometry. Ammonia nitrogen: Nessler's reagent or salicylic acid spectrophotometry. Total phosphorus: ammonium molybdate spectrophotometry, supporting both phosphomolybdenum blue and phosphomolybdenum yellow colorimetry. A high-precision optical path measures the absorbance of each reaction product at its specific wavelength and the concentration is calculated automatically from the stored curve according to the Lambert-Beer law.

IV. Applications

Industrial wastewater: influent, process units and outfall monitoring at wastewater treatment stations in electroplating, printing and dyeing, pharmaceutical and food processing plants.
Municipal sewage: influent, biological units, effluent and reuse water inspection at wastewater treatment plants.
Environmental water bodies: rivers, lakes, reservoirs and wetlands, groundwater monitoring wells and private water sources — routine monitoring and pollution screening.
Drinking water safety: drinking water source protection areas, backup sources and rural centralised water supply facilities.
Enforcement and emergency response: surprise sampling at enterprise outfalls, park outfall patrols, on-site screening of sudden water pollution incidents and pollution plume tracking.
Research and teaching: water quality research, process optimisation and on-site testing and data collection for teaching experiments.

V. Key Features

1. Android-based operating system with an elegant, user-friendly interface.

2. 4.3-inch HD touch screen with visual graphical pages, greatly improving operating efficiency.

3. High-reliability imported LED light source requiring no warm-up and offering long-term stability.

4. 10 mm × 10 mm large-area photocell for high sensitivity and a low detection limit.

5. 16 GB internal memory for more than 10,000 records; an optional Bluetooth printer allows results to be printed on site.

6. Wi-Fi and Bluetooth, plus a USB port for direct high-speed batch upload to a PC.

7. Water-resistant housing; the measuring chamber resists ingress of 0.5 mL of liquid.

8. Standard USB-C 5 V 2.1 A with BC 2.1 charging protocol support — compatible with third-party phone chargers, cables and power banks; intelligent lithium battery charge management allows long periods of mains-powered operation.

9. Bilingual Chinese/English operating system.

VI. Technical Parameters