Instruction Manual

OPERATION 4
35
OPTISENS PH 9100
www.krohne.com09/2012 - 4002314801 - MA OPTISENS PH 9100 R02 en
• Press ^ to confirm.
i The slope of the sensor is displayed (should be near 59 mV in an intact sensor).
• Press ^ to confirm.
i The message store cal. value? is displayed on the screen. The converter asks if the new
calibration values should be stored.
• Choose yes to store the calibration values. Choose no to discard the results.
• Press ^ to confirm.
i Prior returning to the measuring display, you are asked if the configuration should be
stored.
• Choose yes using  or  to store the new calibration values.
i You have completed the pH calibration.
• If you want to return to the measuring mode, press ^ several times until you reach this mode.
Step 5: re-installing the sensor
• After the calibration procedure, rinse the sensor with tap water.
• Reinstall the sensor into its assembly, refer to
Installing the sensor on page 17.
Step 6: switching back to measurement
• Deactivate the function "manual hold" again.
INFORMATION!
If an error occurs during the calibration procedure, the display shows an error message.
Possible causes for an error are:
• Slope too flat.
• Wrong buffer solution.
• Wrong electrical connection.
• Moisture in the sensor connector.