Free Chlorine Calibration - Emerson Rosemount FCL-01 Reference Manual

Calibration
October 2023
2. Allow the sensor to reach thermal equilibrium.
3. Press MENU.
4. Press ENTER.
5. Choose the sensor you wish to calibrate.
6. Choose
7. Change the display to match the temperature read from the calibrated
8. To force the transmitter to accept the calibration, choose
9. To return to the main display, press MENU and then EXIT.
5.3

Free chlorine calibration

5.3.1 Purpose of chlorine calibration
As Figure 5-1
concentration of free chlorine in the sample. Calibrating the sensor requires exposing it to
a solution containing no free chlorine (zero standard) and to a solution containing a known
amount of free chlorine (full-scale standard).
Note
A zero calibration is critical when attempting to measure near the limit of detection for the
sensor. In a process measuring > 0.5 ppm, it may not be necessary
58
The time constant for the sensor is about five minutes, so it may take as long as
thirty minutes for equilibration.
The main Menu screen appears. The cursor is on
is the chlorine sensor.
Sensor 1
.
Temperature
thermometer. Press ENTER.
If the present temperature is more than 5 °C different from the value entered, an
error message appears.
calibration, choose .
No
For troubleshooting assistance, see
showing.
shows, a free chlorine sensor generates a current directly proportional to the
Calibrate
(if present) is the pH sensor.
Sensor 2
Yes
Troubleshooting when no error message is
Reference Manual
00809-0100-3412
.
. To repeat the
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