YOKOGAWA FC400G, User Manual, Page: 10 / 91

< 1. Overview >
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IM 12F5A1-01E
1. OVERVIEW
In recent years, measuring and monitoring the concentration of free available chlorine in water
distribution has become increasingly important for obtaining safe drinking water.
The FC400G free available chlorine analyzer (non-reagent type) is a process-use free available
chlorine analyzer utilizing a rotating electrode polarographic method for measurement.
Commercialized with minimum maintenance as a primary theme, the FC400G can continuously
measure the free available chlorine concentration without reagent use.
When you attempt to measure free available chlorine and the test solution contains combined
chlorine, there's an error which depends on the concentration of the combined chlorine. To reduce the
error in this sort of situation, we recommend that you use the combined chlorine insensitive version
of the Model FC400G that has been developed for this purpose. Compared with the standard Model
FC400G, the electrodes, the beads, and the applied voltage are different, but the unit is otherwise the
same as the standard Model FC400G as regards measurement principles, installation, specifications
and performance.
Figure 1.1 shows the appearance of the FC400G free available chlorine analyzer.
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Figure 1.1 FC400G Free Available Chlorine Analyzer.