Handheld Water Total Phosphorus Meter

I. Product Overview

The handheld total phosphorus system is designed for fast and accurate on-site determination of total phosphorus in water. It consists of a handheld main unit and an accessory case containing a 6-position digester. The main unit combines a multi-wavelength optical system optimised for total phosphorus with a smart operating system and supports both the phosphomolybdenum yellow and phosphomolybdenum blue colorimetric methods; the separate digester ensures that sample pre-treatment complies with the national standard method.

II. Measuring Principle

The measuring principle is based on the national standard ammonium molybdate spectrophotometric method. The water sample is first digested at high temperature with an oxidising agent such as potassium persulfate in the accessory-case digester, converting all forms of phosphorus into orthophosphate. Two colorimetric options are then available: 1. Phosphomolybdenum yellow method — orthophosphate reacts directly with ammonium molybdate in an acidic medium to form a yellow complex, measured at a specific wavelength; 2. Phosphomolybdenum blue method — a reducing agent is added to the yellow complex to form a blue complex measured at a longer wavelength with higher sensitivity. The meter measures the absorbance and applies the Lambert-Beer law with its built-in standard curve to calculate the total phosphorus concentration directly.

III. Applications

Monitoring the efficiency of chemical or biological phosphorus removal and ensuring compliant total phosphorus in the effluent of municipal and industrial wastewater treatment plants; routine eutrophication monitoring, trend analysis and early warning for lakes, reservoirs and rivers; on-site screening and compliance checks of agricultural diffuse sources, urban runoff and industrial outfalls; and rapid, accurate analysis in aquaculture and laboratory research.

IV. Key Features

1. Android operating system with an elegant interface and user-friendly operation.

2. 4.3-inch high-definition touch screen combined with a visual graphical interface that greatly improves operating efficiency.

3. High-reliability imported LED light source: no warm-up required and stable long-term performance.

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

5. 16 GB internal memory stores more than 10,000 records; an optional Bluetooth printer prints results on site.

6. Wi-Fi and Bluetooth connectivity plus a USB port for fast batch upload of data to a PC.

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

8. Standard USB-C 5 V 2.1 A input with BC 2.1 charging protocol support: compatible with third-party phone chargers, cables and power banks, with intelligent lithium-battery charge management for continuous mains operation.

9. Bilingual Chinese / English operating system.

V. Technical Parameters