1. Overview

The total phosphorus water quality online analyzer is a new type of total phosphorus online monitoring instrument developed independently based on magnetic conductivity measurement technology platform, combined with constant temperature optical fiber technology, digestion colorimetric integration technology, etc.

The working principle of this product complies with GB 11893-89 "Determination of total phosphorus in water quality - Ammonium molybdate spectrophotometric method", and it has the characteristics of high reliability, low lower limit of quantification, and good stability. It is widely used in pollution sources, industrial production processes, municipal sewage and other fields.

2. Basic principles

This instrument uses ammonium molybdate spectrophotometry to measure the total phosphorus content in water samples. Dissolve the water sample with potassium persulfate under neutral conditions, and oxidize all the phosphorus content to orthophosphate. In an acidic medium, orthophosphate reacts with ammonium molybdate to form phosphomolybdic acid in the presence of antimony salt, which is immediately reduced by ascorbic acid to form a blue complex. The instrument obtains the total phosphorus value of the water sample through colorimetric measurement.

3. Main features

1) The instrument adopts a 7-inch 1024 * 600 touch screen and uses the Android operating system, with a more beautiful interface and smoother operation;

2) The use of a strong oxidant to digest the sample at high temperature and high pressure at 120 ℃ greatly improved the reaction efficiency;

3) The digestion system has complete protection functions, which can effectively prevent possible leakage and other situations under high temperature and high pressure;

4) According to the actual situation, the digestion temperature and time can be adjusted to ensure sufficient reaction;

5) The use of a patented magnetic conductivity quantification method to quantify samples/reagents fundamentally solves the interference of color turbidity, greatly improving the accuracy and reliability of quantification;

6) The single channel integrated distribution valve island reduces the impact of dead volume on quantitative accuracy, and can be disassembled, cleaned, and replaced in a single channel with low maintenance and cost;

7) The instrument has multiple built-in ranges, and can automatically adjust the range according to the total phosphorus content of the water sample, making the measurement more accurate;

8) The instrument can automatically achieve calibration, cleaning and other functions without user intervention, avoiding measurement errors;

9) When the instrument malfunctions, it has self inspection and maintenance functions to ensure personal safety and equipment safety;

10) When a liquid leak occurs, the device's built-in humidity sensor will sound an alarm and automatically lock;

11) All fault information is recorded at the HMI display terminal, allowing users to query and have a clear understanding of the equipment's operating status;

12) The instrument can be extended with remote upgrade function, and remote maintenance and monitoring of equipment can be achieved through Ethernet port, GPRS port, etc;

13) The instrument has rich external interfaces, and various interfaces used on site (such as Ethernet/4-20mA input, output/RS485/switch input, output, etc.) are available;

14) The instrument has good scalability, allowing for the addition of device functions according to user needs.

4. Main technical indicators

1) Measurement method: Ammonium molybdate spectrophotometric method;

2) Measurement range: 0-2/10/50mg/L (expandable);

3) Zero drift: ± 5%;

4) Range drift: ± 10%;

5) Repeatability: ± 10%;

6) Indication error: ± 10%;

7) Voltage stability: not exceeding ± 10%;

8) Mean time between failures and continuous operation: ≥ 720h/time;

9) Measurement interval: hourly measurement, interval time measurement, and instrument can also be triggered through Modbus;

10) Calibration: Supports manual and automatic calibration. Calibration cycle and time can be set;

11) Temperature for operation and storage: (5-40) ℃, humidity: (65 ± 20)%, no condensation;

12) Power supply and output: (220 ± 22) VAC, (50 ± 0.5) Hz, 200W;

13) Signal output: 1 channel (4-20) mA (expandable to 2 channels), RS232/RS485， 4 multifunctional relays;

14) Signal input: 1 channel (4-20) mA (expandable to 2 channels). 4-channel switch quantity;

15) User maintenance: A single set of reagents can measure 400 samples;

16) Preheating time: 2 hours;

17) Other functions: automatic cleaning, data recording, printing (optional);

18) Instrument size (mm): 500 * 405 * 1400 (excluding wheel height);

19) Packaging size (mm): 600 * 490 * 1510;

20) Instrument weight (kg): 75;

21) Packaging weight (kg): 90.