Emerson Rosemount TCL - Start Sample Flow; Begin Operation and Calibrate the Sensor

3. Zero the sensor.
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.
Procedure
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.
It may take thirty minutes or longer for the reading to stabilize when the sensor is
first put in service.
Startup Reference Manual
January2023 00809-0200-3415
26 Emerson.com/Rosemount