The WATERLINE SIO2-01 process photometer is specially developed for the measurement of very low SiO2 concentrations in water. The measurement principle is the photometric determination of dissolved silicic acid after forming of a reduced β-silico-molybdo-acid complex. Main applications for the analyzer are the monitoring of the steam quality and the control of ion exchange plants.
The analyzer consists 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 systems. The analysis results can be used for the monitoring and control of a supervised process.
- Automatic measurement incl. self-test and drift compensation
- 3 different measurement ranges available for Si and for SiO2
- Easy operation via touchscreen
- Adjustable limit value and alarm value
- Programmable analog output (0/4-20 mA), optional with USB port for easy data storage
- Adjustable break time between two analysis
- External start/stop of analysis possible
- No external calibration required
- External plug connections (IP65) for alarm relay, limit relay, analysis relais, external start/stop, analog output 0/4-20 mA
- Multi-range power supply (110–230 Volt, 50–60 Hz)
- Including 2-part polycarbonate wall cabinet
Parameter | Silica/Silicic Acid | ||
Description | Microprocessor-controlled analyzer for the determination of dissolved silica (Si)/silicic acid (SiO2) in water | ||
Typical Applications | Monitoring and control of steam quality in steam-generating plants. Monitoring and control of ion exchange plants | ||
Analysis Method: | Photometric determination of the dissolved Si/SiO2 by formation of a reduced ß-molybdosilicic acid complex | ||
Analyzer type | Si05/SiO2-05 | Si10/SiO2-10 | Si20/SiO2-20 |
Measuring Range | 2 – 100 ppb Si 4 – 200 ppb SiO2 | 2 – 500 ppb Si 4 – 999 ppb SiO2 | 0,01 – 1,5 ppm Si 0,02 – 3 ppm SiO2 |
Resolution | 1 ppb | 1 ppb | 0,01 ppm |
Accuracy | 2 % of end value | 3 % of end value | |
Reproducibility | 1 ppb/2 ppb | 2 ppb/4 ppb | 0,01 ppm/0,02 ppm |
Zero-point Stability | automatic adjustment | ||
Number of Samples | 1 | ||
Sample | |||
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Operating Pressure | 0,1 - 10 bar | ||
Temperature | 18 - 30 °C | ||
Sample Volume | 25 ml per analysis (excluding rinsing) | ||
Sample Condition | clear, with particles < 0.5 g/l ; < 50 µm | ||
Chemical Demands | pH 4-8, PO4 3-,NH3 < Si | ||
Drain | pressure free into open drain | ||
Reagents | |||
Number | 2 | ||
Storage Temp. | 10 – 30°C | ||
Usage/analysis | 0,3/1,2 ml | ||
Reagent volume | 250/500 ml | ||
Suitable for | appr. 400 analysis | ||
Analysis | |||
Cycle (approx.) | 13 min., incl. rinsing | ||
Sample interval | 1 – 99 min or external start/stop |