9. Is the sample flow to the sensor about 11 mL/min? If the sample flow is too low, the
total chlorine reading will be low. If the flow is too high, the ratio between the
sample flow and reagent flow will be too high, and there might be insufficient
reagent to properly react with the total chlorine in the sample. To check sample
flow:
a. Turn off the reagent and sample pumps.
b. Disconnect the reagent tubing at the injection tee. See B in Figure 13-1.
c. Place the end of the tubing in a 5 mL graduated cylinder.
d. Start the reagent pump and collect reagent for ten minutes.
e. Note the volume of reagent collected in the graduated cylinder. After ten
minutes, the volume should be about 2 mL.
10. Is the reagent flow about 0.2 mL/min? If the reagent flow is too low, there might be
insufficient acetic acid to lower the sample pH and insufficient potassium iodide to
react with total chlorine in the sample. To check reagent flow:
a. Turn off the reagent and sample pumps.
b. Disconnect the reagent tubing at the injection tee. See B in Figure 13-1.
c. Place the end of the tubing in a 5 mL graduated cylinder.
d. Start the reagent pump and collect reagent for ten minutes.
e. Note the volume of reagent collected in the graduated cylinder. After ten
minutes, the volume should be about 2 mL.
Troubleshooting
72 Rosemount TCL
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