Chemistry Reference
In-Depth Information
From individual monitors to complete on-line systems, these analysers are deployed
throughout many treatment processes to improve efficiency and ensure effective
treatment as well as to protect the environment and ultimately the drinking water supply.
The Skalar SA 9000 on-line process analyser is available in two models—as a free-
standing unit complete with its own storage section for reagents or as a unit which may
be bench or wall mounted or built into an even more comprehensive control system. The
main unit consists of the on-line analyser, in which the analysis of the process stream is
fully automated. The analysis process is based on the automated addition of sample to
reagents which form a coloured complex under controlled conditions. The complex is
measured photometrically. The signal is fed into the microprocessor which offers the
flexibility for the specific application. Sampling is carried out directly from the process
stream.
For analysing the same process stream component from several sources, a multi-stream
attachment can be supplied. For samples carrying suspended particles, a special
continuous in-line filter system is available. Calibration valves allow the introduction of
standards and blanks for automatic calibration. Some applications of the SA-9000
analyser are shown in Table 17.3.
The Dionex series 8100 process analyser employs ion chromatography, high
performance liquid chromatography, or flow-injection techniques for the on-line
determination of a variety of constituents in process streams. This is a modular
instrument which can be modified should processing needs change (Fig. 17.1).
Fig. 17.1
Flowchart: Dionex series 8100 process analyser: (a) sample selection
module—up to 18 sample points, continuous or sample on demand,
non-metallic, NEMA 4 enclosure; (b) sample preparation module:
dilution, reagent addition, standard preparation, preconcentration,
matrix elimination; (c) chromatography hydraulics module: ion
chromatography, high performance liquid chromatography, flow
Search WWH ::
Custom Search