5.2 Zero the sensor
Complete the following steps to zero the 499ACL-02 Total Chlorine 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 current is stable.
3. Zero the sensor.
See Section 8.4.
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
Complete the following steps to start operating the Rosemount TCL and calibrate the
499ACL-02 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 fills rather slowly. Also observe that the air pump is operating.
The pump produces very vigorous bubbling in the flow cell. Once the flow of reagent
starts, it takes about two minutes for the reagent to reach the flow cell. If the
concentration 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.
2. Monitor the sensor current. Once the reading is stable, calibrate the unit.
See Section 8.4. It may take thirty minutes or longer for the reading to stabilize when
the sensor is first put in service.
Startup
26 Rosemount TCL
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