Important
Please note:
Temperature and conductivity are combined in one sensor.
If temperature and conductivity are both being calibrated, always calibrate the
temperature first.
Be careful not to damage (avoid excessive twisting, bending, etc.) the sensor
leads when removing the sensor from the pipe fitting.
Never reuse standard solutions. Always dispense the solution from its container
and dispose of the solution after using it.
Use clean containers (triple rinsed with deionized water) for holding the
calibration solution.
Step Two
– Go to the appropriate Settings data entry screen (23 or 24). Enter the
value of the calibration solution via the keypad. Press ENTER. A new measured
value will appear on the screen.
If the value displayed on the screen does not match the value entered for the
calibration solution, let the sensor equalize for a few more minutes and repeat Step
Two.
Troubleshooting
If problems occur during calibration, please check the following:
Ensure that the Settings screen corresponds to the sensor being calibrated.
Check the condition of the sensor. Make sure that the electrode surfaces are not
damaged, corroded, or fouled.
Make sure that the sensor is suitable for use with the AL250-V2. Verify that the
cell constant is correct for the conductivity range selected and that the sensor is
equipped with the proper temperature element (1000-Ohm Platinum RTD).
Check the condition of the sensor wiring and that the sensor leads are properly
connected to the AL250-V2 terminals.
Verify that the calibration solution is the correct conductivity value and that the
value is within the range selected of the conductivity input being calibrated.
Refer to the Troubleshooting Section of the manual for more information.
Temperature
The temperature elements in the conductivity sensors are calibrated in a similar
fashion as the conductivity sensors. Follow these steps for temperature calibration.
Step One
– Place the conductivity sensor in a water sample at approximately the
same temperature as that being monitored in the process. Measure the temperature
with a laboratory grade thermometer. Allow the sensor to equalize to the solution
temperature for a few minutes before proceeding with the next step.
Important
Please note:
Temperature and conductivity are combined in one sensor.
4-2
SETTINGS
>23< RW=XXX CO=XXX
Feed CND Standard
OLD=1000 New=?
RW = Uncorrected Conductivity
CO= Corrected Conductivity After
Calibration is Applied
(Updates Only When "ENTER" is Pressed)
Settings Screen
Index Number
Standard Value (uS) Previously
Used for Calibration
Enter Value of Calibration
Solution (uS) Via Keypad
