KROHNE OPTISENS PH 8590 - Manual (Page 32)

4
OPERATION
32
OPTISENS PH 8590
www.krohne.com 03/2012 - 4001931401 MA OPTISENS PH 8590 R01 en
Step 4: calibration procedure
• After choosing the submenu pH cal. pH cal. pH cal. pH cal. (step 3a) or pH cal. A or B pH cal. A or B pH cal. A or B pH cal. A or B (step 3b) in the previous steps,
continue by pressing > >>>.
i The signal converter demands to choose the kind of temperature compensation for the
calibration. You have the options "off", "automatic" and "manual" (for detailed information
refer to
Temperature compensation on page 25). Please select the same kind of
temperature compensation for the calibration as for the measurement.
• If you chose "automatic", just press ^ ^ ^ ^. If you chose "manual", first enter the temperature of
the buffer solutions using or and then press ^ ^ ^ ^.
i On the screen the message calib. buffer 1 calib. buffer 1 calib. buffer 1 calib. buffer 1 appears.
• Submerge the sensor tip into the pH 7 buffer solution 1.
i The currently measured value is shown on the display.
• Wait until a steady value is displayed, then press ^ ^ ^ ^.
• Press ^ ^ ^ ^ to finally start the calibration procedure.
i The message pH 1 set value pH 1 set value pH 1 set value pH 1 set value and the pH value of the first buffer solution are displayed on
the screen.
• Press ^ ^ ^ ^ to confirm the settings.
• After 25 seconds the calibration step is completed and calib. buffer 2 appears. Otherwise, If
the shown value deviates from the buffer solution, enter the correct value using or .
• Press ^ ^ ^ ^ to confirm the entered value.
i On the screen the message calib. buffer 2 calib. buffer 2 calib. buffer 2 calib. buffer 2 appears.
• Rinse the sensor tip with tap water 2 and clean it with a soft tissue.
• Submerge the sensor tip into the pH 4 buffer solution 3.
i The currently measured value is shown on the display.
• Wait until a steady value is displayed.
• Press ^
^ ^ ^ to continue the calibration procedure.
i The message pH 2 set value pH 2 set value pH 2 set value pH 2 set value and the pH value of the second buffer solution are displayed on
the screen.
• Press ^ ^ ^ ^ to confirm the setting.
• After 25 seconds the calibration step is completed. Otherwise, if the shown value deviates
from the buffer solution, enter the correct value using or .
• Press ^ ^ ^ ^ to confirm the entered value.
i The zero point of the electrode is displayed (should be near 0 mV in an intact electrode).
Figure 4-1: Calibration procedure
.book Page 32 Monday, March 19, 2012 2:01 PM