Emerson Rosemount TCL - 6.4 Security

Once the calibration is complete, the screen shows the results of the calibration.
The screen also shows some acceptance criteria to help you determine whether to
accept the calibration.
2. Press INFO for an information screen to aid with troubleshooting if the calibration
results are not acceptable.
8.4
Procedure
1. Choose sensor 1 ( chlorine) in Entering the Calibration menus.
The screen below appears.
There are two steps to calibrating a free chlorine sensor, measuring the zero current
(Zero) and determining the slope of the calibration curve (Grab). Because stable
chlorine standards do not exist, the sensor must be calibrated against the results of
a laboratory test run on a grab sample.
2. To zero the sensor, select Zero and follow the prompts.
For more information about preparing the zero solution and measuring the zero
current, press INFO when prompted.
If the zero step is successful, the transmitter displays the Zero complete screen and
the measured zero current. The screen also shows the typical zero current for the
sensor and the recommended acceptance criterian. You are asked to accept the zero
current. Press INFO for an information screen to aid with troubleshooting if the
results are not acceptable.
If the zero current is badly in error, the transmitter displays the Zero failed screen.
Press INFO for troubleshooting.
3. To calibrate the sensor response in chlorinated water, select Grab and follow the
prompts.
Be sure the sensor is installed in the flow cell in the and the sample is flowing down
the inside tube of the overflow sampler.
If the calibration is successful, the transmitter displays the Calibration complete
screen and the sensitivity (nA/ppm). The screen also shows the typical sensitivity
range for the sensor and the recommended acceptance criterion. You are asked
to accept the calibration. Press INFO for an information screen to aid with
troubleshooting if the calibration is not acceptable.
If the sensitivity is badly in error, the transmitter displays the Calibration failed
screen. Press INFO for troubleshooting.
Calibrate Reference Manual
January2023 00809-0200-3415
42 Emerson.com/Rosemount