The Model TCL is a sample conditioning system used with the 499ACL-02 total chlorine sensor for the determination of total chlorine in water, including the determination of total oxidants in chlorinated seawater.
The sample conditioning system permits a single sensor to measure total chlorine in water. It continuously injects a solution of acetic acid (vinegar) and potassium iodide into the sample. The acid lowers the pH to between 3.5 and 4.5 and allows total chlorine in the sample to quantitatively react with the potassium iodide to produce iodine. The sensor measures the iodine concentration, and the analyzer displays the total oxidant concentration in ppm as Cl2. Five gallons (19 L) of reagent lasts two months.