Compact online colorimeter for the automatic measurement of Silica


  • Power plants
  • Ultrapure water treatment
  • Cooling water
  • Water steam cycle
  • Condensate analysis
  • High-pressure boiler feedwater
  • Reversed osmosis
  • Turbine protection
  • Demineralization plants


Dual compartment enclosure
To ensure complete separation between the electronics and the wet part.

Low reagent consumption
Minimum operating cost by small reagent consumption, only 2.5L (0.66 for the 16 mm cell / 5L (1.32 for the 26 mm cell of each reagent every 90 days with 15-minute analysis frequency.

Automatic calibration / validation / cleaning
Validation, cleaning and calibration are standard features which significantly reduce downtime and operator intervention ensuring the most accurate results are obtained.
Free selectable validation, cleaning and calibration intervals.

Wide measuring range
The determination ranges of the Silica Analyzer vary from trace μg/L to 150 mg/L using internal dilution module.

Color touchscreen user interface
The Colorimeter is equipped with a graphic touchscreen interface showing measured values and status information. Easy access to menus and functions. Multiple languages. Integrated datalogger with USB download.

Factory tested, ready for installation and operation
Just connect the power, sample, and reagent lines and the analyzer is fully operational.

Multiple streams
Dual streams version available. External Sequencer, switching up to 4 sample streams.


Soluble silica reacts with the molybdate ion in an acid medium to form a green yellow colored silico-molybdic acid complex that in its turn is converted to a blue complex with the addition of the reducing reagent. Oxalic acid is added to minimize the phosphate interference. The absorbance intensity is proportional to the silica concentration in the sample and is determined at 850 nm.


Technical data:

Measured parameter: Si4+ / SiO2 (ppb, ppm, mg/l).
Measuring principle: Differential photometric absorbance
Measuring range:0.5 to 1000 ppb (26 mm cell) 1 to 5000 ppb (16 mm cell) up to 150 mg/L with internal dilution.
Reproducibility: ± 0.5 ppb or ± 5%, whichever is greater (26 mm cell) ± 1 ppb or ± 5%, whichever is greater (16 mm cell)
Analysis frequency: Freely programmable, batch near-continuous analysis.
Cycle time:8-10 minutes, including conditioning before analysis cycle and rinsing after measuring.
Reaction cell: Temperature heated
Sample: Pressure-free from overflow vessel
Temperature: 41 - 122 °F (5 to 50 °C)
Flow Rate: 80 to 500 mL/min
Connection: 6 mm (¼-in.)
Drain:Pressure-free, atmospheric drain
Connection: 12 mm (½-in.)
N° of streams: 1, 2 with integrated switching valve
3, 4 with external sequencer
Dimensions (H x W x D):23.6 x 15.0 x 8.2 poll. / 606 x 380 x 209 mm
Weight:Approx. 44 lbs (20 Kg)
Power supply: Voltage: 100 - 240 VAC 50/60 Hz standard or 24 VDC (option)
Power consumption: max. 80 VA
Outputs: 2 x 4-20 mA outputs for measured data
Modbus RTU RS485
Alarms: 4 SPDT programmable potential free relays
Digital input: Remote start / stop
Operating Temperature: 41 - 113 °F (5 - 45 °C)
Humidity:10 to 90% non-condensing (indoor use, outdoor installation only possible with protective cabinet or shelter not included)
Installation: Wall mount (standard), bench top support or panel mount (options).
Ingress Protection: IP54

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