Probes and Probe Cleaners

In wastewater applications, environmental engineers use analytical probes to detect concentrations in the sludge layers situated in the lower parts of scraped bottom tanks. These probes are installed on pivoted hinges so that the mechanical scraper assembly can pass (see Figure 7.7.1).

FIG. 7.7.1 Probe-type sensors used to detect the composition of sludge and slurry layers in clarifiers. (Courtesy of Markland Specialty Engineering Ltd.)

FIG. 7.7.2 Probe cleaner mounted in sight-flow glasses for good visibility. (Courtesy of Aimco Instruments Inc.)

FIG. 7.7.1 Probe-type sensors used to detect the composition of sludge and slurry layers in clarifiers. (Courtesy of Markland Specialty Engineering Ltd.)

FIG. 7.7.2 Probe cleaner mounted in sight-flow glasses for good visibility. (Courtesy of Aimco Instruments Inc.)

While probe-type in-line analyzers eliminate the transportation lag and sample deterioration problems associated with offline analysis, they illustrate the need for efficient probe cleaners. A probe cleaner should be placed inside a sight glass so that clearer performance can be continuously observed by the operator (see Figure 7.7.2). A variety of probe-cleaning devices are available. Table 7.7.1 lists features and capabilities for the removal of various coatings and Table 7.7.2 lists suppliers.

If no sampling system is used, sample integrity is automatically guaranteed, and sensors that penetrate the

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