Endress+Hauser Stamolys CA71SI Series, Техническая информация

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Stamolys CA71SI
Hauser 3
Photometric detection Heteropoly blue method for silicate determination
Under acidic conditions silicate and phosphate react with molybdate to form yellow silicomolybdic and
phosphomolybdic acid complexes. Addition of citric acid destroys the phosphate complexes. Last step is the
addition of an amino acid. It reduces the yellow silicomolybdic complex to intensively blue silicomolybdic blue.
The absorption is determined at a wave length of 810 nm. The absorption intensity is proportional to the silicate
concentration in the sample.
Interferences
Sample conditioning Analyzer and membrane filtration (Stamoclean CAT411)
A sample flow of 0.8 to 1.8 m
3
/h (3.5 to 8 gal/min) is continuously conducted through the micro filter via a
pressure pipe. A part of the sample passes the filter membrane and is then conveyed to the measuring device
as filtrate.
Sampling is based on the cross flow filtration principle. The PTFE filter membrane separates particles with sizes
> 0.45
μ m from the filtrate. These particles are collected in front of the membrane and are washed away with
the sample flow.
The medium is conducted in a meander-like channel through the filter element. This results in a constantly
high flow rate. The high flow rate generates the self cleaning effect. Therefore, mechanical drives for the
generation of a flow at the filter surface are not necessary.
Analyzer without Hauser sample conditioning
Before analysis, the sample has to be conditioned, homogeneous and to be transported to an external or to the
delivered collecting vessel.
Measuring system A complete measuring system comprises:
• An analyzer
• A sample conditioning system (optionally):
– Micro filtration / ultra filtration Stamoclean CAT411
– Customer specific solution
• Collecting vessel (see product structure)
Standard application Reversed osmosis or demineralizer monitoring, steam and condensate analysis
Sampling from hydraulic main, measurement after cooling and pressure reduction:
• Analyzer with collecting vessel, Stamolys CA71SI-Ax0A3A1
Expansion up to a six channel system by means of a separate SPS possible (s. special accessories)
Interferring substance Interference
Color eliminated by calibration
Iron interferences from 1 mg/l (ppm)
Phosphate interferences from 50 mg/l (ppm)
Sulfide interferences at high concentrations
Turbidity eliminated by calibration
Micro / ultra filtration
a0001615
Measuring system with Stamoclean CAT411
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9 Stamoclean CAT411
Inlet
Sample pump or hydraulic main
Filtrate line
Collecting vessel
Overflow
Analyzer
Analyzer sample line
Outlet