Process analyzers for Orthophosphate measurement
The WATERLINE PO4-10 and PO4-20 process photometers can be used for the monitoring and control of the concentration of orthophosphate (PO4 3-) in water. Measurement principle is the photometric detection of the color change of a water sample after the formation of a molybdoblue-phosphoric acid complex (PO4-10) or a molybdovanadate-phosphoric acid complex (PO4-20).
Main applications for the photometers are the monitoring of surface water, treated water, waste water or process water and the control of phosphate dosing plants. The analyzers consist of a control unit with touchscreen and an analysis unit with measuring chamber, valve, dosing pumps and all required tube connections. The control unit includes a microprocessor which controls the automatic measurement incl. sampling, rinsing, reagent dosing and surveillance of the photodetection system.
Advantages:- Automatic measurement incl. self-test and drift compensation
- Easy operation via touchscreen
- Adjustable limit value and alarm value
- Programmable analog output (0/4-20 mA), optionally with USB port for easy data storage
- Adjustable break time between two analysis
- External start/stop of an analysis possible
- No external calibration required
- External plug connections (IP65) for alarm relay, limit relay, analysis relay, external start/stop, analog output 0/4-20 mA
- Multi range power supply (110–230 Volt, 50–60 Hz)
- Including polycarbonate wall cabinet
| Parameter | Orthophosphate (PO4 3-) | |
| Description | Automatic microprocessor controlled analyzer for the photometric determination of dissolved orthophosphate | |
| Typical Applications | Monitoring of surface, treated and clarified water Control of phosphate dosing plants | |
| Analysis Method: | Molybdoblue method | Molybdovanadate method |
| Analyzer type | WATERLINE PO4-10 | WATERLINE PO4-20 |
| Measuring Range | 0,05 – 10 ppm | 0,5 – 50 ppm |
| Resolution | 0,01 ppm | 0,1 ppm |
| Accuracy | 2 % of end value | |
| Reproducibility | 1 % of end value | |
| Zero-point Stability | automatic adjustment | |
| Number of Samples | 1 | |
| Sample | ||
|---|---|---|
| Operating Pressure | 0,1 - 10 bar | |
| Temperature | 5 - 30 °C | |
| Sample Volume | 25 ml per analysis (excluding rinsing) | |
| Sample Condition | clear, filtrated | |
| Chemical Demands | pH 4-8 | |
| Drain | pressure free into open drain | |
| Reagents | ||
| Number | 2 | 1 |
| Storage Temp. | 0 - 30°C | 0 - 30°C |
| Usage/analysis | appr. 1,35 ml each reagent | appr. 2,7 ml |
| Reagent volume | 500 ml | 500 ml |
| Suitable for | appr. 370 analysis | appr. 185 analysis |
| Analysis | ||
| Cycle (approx.) | 3 - 12 min (incl. rinsing) | |
| Sample interval | 1 – 99 min or external start/stop | |