Silica

SiO2

Applications

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

Description

The determination ranges of the silica analyzer vary from trace μg/L to 150 mg/L using the (optional) internal dilution module.

Method

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.

Features

Measured parameter SiO2

Range

(Ø 26 mm) 0.5 - 1000 ppb
(Ø 16 mm) 1 - 5000 ppb
(with dilution) 0.05 - 150 ppm

Reproducibility*

* if two values take whichever is greater.
(Ø 26 mm) ± 0.5 ppb / ± 5%
(Ø 16 mm) ± 1 ppb / ± 5%
Limit of detection 0.5 ppb
Wavelength 850 nm
Demineralized water Not required
Number of reagents 4
Min. analysis time 10 minutes
Default analysis time 15 minutes

Reagent consumption**

** per month, at the default analysis frequency.
(Ø 26 mm) 2.6 L
(Ø 16 mm) 1.4 L

Reagents and standards

Technical Specifications

Model 3S-CL
Sampling Mode Batch, with freely settable frequency.
Sample Pressure: Atmospheric
Temperature: 5 ‐ 45°C (41 ‐ 113°F)
Flow Rate: 80 to 500 mL/min
Connection: 6 mm (¼-in.)
Drain Pressure-free drain
Connection: 12 mm (½-in.)
Input Streams 2
Material Epoxy-coated stainless steel AISI 304
Dimensions (H x W x D) 604 x 380 x 210 mm (23.6 x 14.8 x 8.2 in)
Weight 20 kg (44 lbs)
Power Supply Input Voltage: 115 VAC,230 VAC,24 VDC
Power consumption: max. 80 W
Output signals 2 x 4-20 mA analog outputs
Modbus via RS485,Ethernet
Alarms 2 SPDT programmable voltage-free relays
Digital Input None, Online, Start Extra, Skip Idle, Emergency Stop
Ambient Temperature 5 - 45 °C (41 - 113 °F)
Ambient Humidity 10 - 90 % RH (non-condensing)
Protection Grade IP54 (indoor only, outdoor use possible with external cabinet, not included)

Documentation

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