DG7-FC: Free Chlorine Sensor

The DG7-FC is a panel-mount, ready-to-use Free Chlorine Sensor. It is designed to monitor free chlorine in drinking water, rinse water, cooling water and any other fresh water samples.
The sensor provides two measurement ranges, the standard 0.05~10.00ppm, and the extended 0.01~5.00ppm for low values.
The DG7-FC is compliant with EPA method 334.0 for measuring drinking water.

Free Chlorine exists in a pH-dependent solution with a mixed ratio of hypochlorous acid (HOCl) (~100% at pH 5) and OCl- (~100% at pH 10).
Free Chlorine is the sum of HOCl and OCl- in the sample.
The Free Chlorine Sensor measures only the HOCl component whereby the analyzer calculates the balance of the free chlorine components by either a measured or a user defined value and finally gives out the free chlorine number.
The utilization of the pH sensor provides an accurate compensation for samples with pH between 6 and 9.5, which eliminates the expensive sample conditioning system commonly required for controlling the pH of the test solution.