During a calibration cycle, the calibration solution flows into the sample cell. The analyzer adds the
reagents, measures the color of the calibration solution and calculates the slope of the calibration
curve. The analyzer uses the slope to calculate the concentration of samples.
In the heteropoly blue method
1
, an acidic molybdate reagent reacts with silica and phosphate to form
molybdosilicic and molybdophosphoric acids. A citric acid/surfactant reagent removes the
phosphomolybdic acid complexes. The surfactant prevents the formation of air bubbles on the
sample cell walls. The analyzer uses the absorbance of this solution as the zero reference, which
corrects for interference from background turbidity or color, changes in lamp intensity or optical
changes of the sample cell. An amino acid reagent reduces the molybdosilicic acid to a blue color.
The analyzer measures the intensity of the blue color and calculates the silica concentration.
More information is available on the manufacturer's website.
Installation
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Mechanical installation
D A N G E R
Risk of injury or death. Make sure that the wall mounting is able to hold 4 times the weight of the
equipment.
W A R N I N G
Personal injury hazard.
Instruments or components are heavy. Use assistance to install or move.
The object is heavy. Make sure that the instrument is securely attached to a wall, table or floor for a
safe operation.
This instrument is rated for an altitude of 2000 m (6562 ft) maximum. Use of this instrument at an
altitude higher than 2000 m can slightly increase the potential for the electrical insulation to break
down, which can result in an electric shock hazard. The manufacturer recommends that users with
concerns contact technical support.
Install the analyzer indoors, in a non-hazardous environment. Refer to the supplied mounting
documentation.
Plumbing
D A N G E R
Fire hazard. This product is not designed for use with flammable liquids.
N O T I C E
Do not install reagents until all plumbing is complete.
Make sure to use the specified tubing size.
1
Standard Methods for the Examination of Water and Wastewater, 21st Edition, 2005, Centennial
Edition, APHA, AWWA, WEF, pp 4–167, 4500-SiO
2
D.
6 English
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