Automatic Total Phosphorus/Total Nitrogen Analyzer TPN-6200
The TPN-6200 is an automatic total phosphorus/total nitrogen analyzer which quickly and accurately measures total phosphorus and total nitrogen content in factory wastewater or river water in online mode.
This system has low reagent consumption, and can provide automatic neutralization treatment of waste liquid (optional). A dilution function can be built-in, and the system achieves space-savings and low running cost.
Features
- Measures total phosphorus and total nitrogen with just one unit. Low-cost and space-saving.
- Measurement system conforms to the official method, with heating at 120 °C for 30 minutes.
- Load calculation function is standard equipment.
- Equipped with high-performance data processing functions enabling trend data display.
- Equipped with a data printing function for recording measurement values, daily reports and other data, and a high-performance self-diagnosis function.
- Equipped with easy calibration mode to greatly reduce calibration time.
- Equipped with a sample removal port for manual analysis and cross checking.
- The system can also measure 3 components (COD, TP, TN) if a UV analyzer is added (optional).
- We can also supply systems which measure only one component, TP or TN.
Principle of Measurement
An alkali aqueous solution of potassium peroxodisulfate is added to the sample, which is then heated and decomposed at 120 °C. Nitrogen compounds are decomposed into nitrate ions, and phosphorus compounds are decomposed into phosphate ions.
For total nitrogen, this solution is cooled, and the absorbance of two wavelengths is measured: 546 nm for turbidity correction, and 220 nm for nitrogen measurement. The total nitrogen value is obtained from a calibration curve for absorbance and total nitrogen stored beforehand in the signal processing unit.
For total phosphorus, ammonium molybdate solution and L-ascorbic acid solution are added to this solution to develop molybdenum blue. Then the absorbance of 880 nm is measured, and the total phosphorus value is obtained from a calibration curve for absorbance and total phosphorus stored beforehand in the signal processing unit.
Specifications
| Measurement range | Total phosphorus (TP): 0-0.25 / 1.0 mgP/l Total nitrogen (TN): 0-2.0 / 5.0 mgN/l |
|---|---|
| Dilution function | 2-200 times *1 |
| Measurement stream | 1 stream (Standard), 2/3 streams *1 |
| Measurement modes | Shortest repeat, Measurement every hour on the hour, Cycle measurement(1-99 hours) |
| Measurement method | Total phosphorus (TP): 120 °C decomposition - molybdenum blue absorption spectroscopy Total nitrogen (TN): 120 °C decomposition - UV absorption spectroscopy |
| Calibration method | Manual calibration (Zero, Span) High-speed calibration (3 times/hour) Process calibration Automatic calibration (Option) |
| Display | 6-digit digital display, 3-digits after the decimal point |
| Recording system | Built-in printer (Data is saved for about 2 weeks) |
| Load calculation function | Built-in |
| Waste liquid neutralization function | Built-in (Option) |
| Construction | Standalone console, with casters |
| Dimensions | 700W × 600D × 1600H mm |
| Weight | Approx. 160 kg |
| Standard liquid | Total phosphorus (TP): Potassium dihydrogen phosphate aqueous solution Total nitrogen (TN): Potassium nitrate aqueous solution |
| Repeatability | Within ±3％ of full scale |
| Zero stability | Within ±3％ of full scale/day |
| Span stability | Within ±3％ of full scale/day |
| Ambient temperature variation | Within ±3% of full scale/5°C |
| Measurement value output | External output: DC4-20mA Range ID signal no-voltage contact: AC125V, 1A |
| Error alarm indication | Panel display, Closed contact output in case of error (AC125V, 1A) |
| Alarms | Temperature error No sample (Option) Out of reagent (Option) Out of washing water (Option) |
| Sample conditions | Online measurement: 0.02-0.1 MPa, 500 ml/min or higher Offline measurement: Normal pressure, 300-500 ml/3 times |
| Reagents/Utilities | Potassium peroxodisulfate Ammonium molybdate Sulfuric acid mixed liquid L-ascorbic acid Sodium hydroxide |
| Power | AC100V±10V 50/60Hz Approx. 450VA |
| Set up conditions | Indoors 5-35 °C during operation (Temperature gradient 5 °C/hour or less) 65±20%RH (No condensation) |
Specifications are subject to change due to product improvements.
*1 The dilution function is an option.
