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MODEL TCL SECTION 5
START-UP
SECTION 5. START-UP
5.1 PREPARE THE REAGENT
1. DO NOT PREPARE THE SOLUTION UNTIL READY TO USE.
2. Position the blue plastic carboy under the sample conditioning cabinet. Unscrew the cap and reagent tube
assembly.
3. Add the potassium iodide reagent to the carboy. See the table.
4. Add five gallons (19 L) of distilled white vinegar one gallon (4 L) at a time. Swirl the carboy after each addition
5. Screw the cap on the carboy. Be sure the reagent uptake tube extends to the bottom of the carboy.
6. Connect the reagent tube to the small fitting on the bottom left hand side of the enclosure.
NOTE
The shelf life of the potassium iodide vinegar solution is at least two months if stored in the blue
carboy. Do not store the reagent in a container other than the blue carboy. The reagent is sensi-
tive to sunlight, which the blue carboy effectively blocks.
5.2 ZERO THE SENSOR
1. Place the sensor in a beaker of deionized water or simply place the sensor in air.
2. Let the sensor operate until the sensor current is stable, then zero the sensor. See Section 8.3.2 for detailed
instructions.
5.3 START SAMPLE FLOW
Adjust the sample flow until a slow stream of liquid is running down the inside tube of the sampling cup.
5.4 BEGIN OPERATION AND CALIBRATE THE SENSOR
1. Turn on the reagent and sample pump switches. Observe that liquid begins to fill the flow cell. The sample flow
is about 11 mL/min, so the flow cell will fill rather slowly. Also observe that the air pump is operating. The pump
will produce very vigorous bubbling in the flow cell.
2. Once the flow of reagent starts, it takes about two minutes for the reagent to reach the flow cell. If the con-
centration of total chlorine in the sample is greater than about 0.5 ppm, the treated sample in the flow cell will
be pale yellow. Sample containing more chlorine will be dark yellow.
3. Monitor the sensor current. Once the reading is stable, calibrate the unit. See Section 9.3.3 for detailed instruc-
tions. It may take thirty minutes or longer for the reading to stabilize when the sensor is first put in service.
WARNING
The reagent contains potassium iodide dissolved in distilled vinegar or 5%
acetic acid. Avoid contact with skin and eyes. Wash thoroughly after using.
NOTE
Complete Section 4 before starting this section.
Expected range, Amount of KI needed Part number
ppm as Cl2 per 5 gal (19 L) of vinegar
0 – 5 ppm 25 grams 24164-00
0 – 10 ppm 50 grams 24164-01
0 – 20 ppm 2 x 50 grams 24164-01
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