Total phosphorus monitor

1.Principle of total phosphorus monitor

The principle of the total phosphorus monitor is that in the presence of a catalyst, phosphate ions form a colored complex in a strong acid solution containing molybdate. The analyzer detects the color change and converts this change into total phosphorus. The value is output. The amount of colored complex formed is equivalent to the total phosphorus amount. Under high temperature and high pressure conditions, the sample is digested with potassium persulfate, and all phosphorus-containing compounds in the sample are converted into orthophosphate (this step is not required for measuring orthophosphate). In 5%-8% nitric acid solution, orthophosphate forms a soluble phosphorus vanadium molybdenum yellow complex with ammonium metavanadate and ammonium molybdate. Its absorbance is measured at a specific wavelength. The absorbance is consistent with the orthophosphoric acid content of the sample. There is a linear relationship with salt concentration. Based on this relationship, the absorbance can be converted into the total phosphorus (TP) or orthophosphate (PO4) concentration value of the sample.

2. Product features of total phosphorus monitor

The new photoelectric quantitative technology is not affected by interference such as large chroma, suspended solids, and bubbles. It has high reliability, accuracy, and strong anti-interference ability.

The detection accuracy is high, the lower limit of measurement is low, and the long-term drift of the instrument is small.

It has one-click self-test function and self-diagnosis function.

Using a single-channel highly integrated valve group, maintenance and cleaning are simple and fast.

All-weather networking function allows you to monitor the operating status of the instrument anytime and anywhere.

It has alarm function, quality control function and reverse control function.

Equipped with automatic cleaning function and automatic calibration function.

Equipped with whole point measurement, interval measurement and external control measurement.

It will work automatically after power failure and recovery.

Automatic prompts and automatic reset functions for faults and lack of reagents (samples).

With fault recording function.

Can save more than 3 years of historical data.

Meet the requirements of separate discharge of cleaning liquid and waste liquid

3. Technical parameters of total phosphorus monitor

Measurement method: Ammonium molybdate spectrophotometry (HJ670-2013)

Measuring range: 0-2 mg/L; 0-10 mg/L; 0-50 mg/L; range can be customized

Indication error: ≤±3% Detection limit: 0.010mg/L

Repeatability: ≤±3% Waste liquid volume: 4.5mL/time

Memory effect: ≤±1% Actual water sample comparison: ±8%

Constant temperature time: 900 seconds Voltage stability: ≤±5%

Measurement period: 39 minutes Calibration period: any specified time

Maintenance cycle: ≥720h/time Maintenance workload: <2 hours/month

Reagent consumption: 3 months/500ml Display output: Equipped with 10.1-inch color LCD touch screen

Color temperature: The recommended temperature is 120°C, which can be set according to the actual water sample conditions

Data export: Measured values ​​can be imported into a U disk and saved through the USB port.

Signal output: RS485/RS232/USB interface/standard configuration: 2 channels of 4-20mA output/standard configuration of two channels of switching input and output

Environmental requirements: Temperature-controlled indoors, recommended temperature (5-28°C), humidity ≦90% (no condensation)

Power supply and power: (220V±22)V/AC, (50±0.5Hz), 5A, 150W

Instrument size: upper cabinet 600*450*300mm; upper cabinet 700*450*300mm