KROHNE OPTISENS PH 8500 EN - Manual (Page 38)

4
OPERATION
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OPTISENS PH 8500
www.krohne.com 04/2012 - 4001927601 - MA OPTISENS PH 8500 R01 en
4.3.3 Calibration log
Accessing the calibtration log
• You are on the data level and you see the calibration history. With the help of or you can
scroll through the different entries.
• If you want to return to the measuring mode press ^ ^ ^ ^ several times until you reach this mode.
4.4 Troubleshooting
INFORMATION!
In order to show the history of the calibrations, the converter has a calibration logbook function.
Up to 64 entries of the calibration history are stored including date and time.
• Press >>>> for more than 2.5 seconds, then release the button. You are on the main menu level. In the
upper line of the display "A" appears, beneath the main menu quick setup
quick setup quick setup quick setup is highlighted.
• Press or until the main menu test test test test is highlighted.
MAIN MENU
A quick setup
> B test > B test > B test > B test
C setup
D service
Press >>>> to enter the chosen menu.
You are on the first submenu level. In the upper line of the display "test" and "B1" appears,
beneath the submenu sim.process input A sim.process input A sim.process input A sim.process input A is highlighted.
Press or until the submenu logbooks logbooks logbooks logbooks is highlighted.
Press >>>> to enter the chosen menu.
You are on the second submenu level. In the upper line of the display "logbooks" and
"B1" appears, beneath the submenu status log status log status log status log is highlighted.
Press or until the submenu calibration log calibration log calibration log calibration log is highlighted.
Press > >>> to enter the chosen menu.
Problem Possible cause Remedy
The pH electrode
does not deliver a
signal.
Mechanical damage of the
glass bulb, e.g. small
cracks. This will shortcut
the ion exchange and
deliver a pH7 reading.
Exchange electrode.
Moisture inside the
electrode connector. This
will shortcut the signal
between pH glass half cell
and reference half cell
and deliver a reading of
pH7.
Clean the connector (electrode/cable) with pure water
and dry with air (e.g. hair blower).
The pH electrode
delivers an
unstable signal.
The diaphragm in the
reference half cell does
not provide good contact
to the process medium
due to drying up or
coatings.
• Clean the diaphragm with hot soap or acid using a
soft tissue (details on page 39).
• Submerge electrode in water and increase the
temperature to 50...60°C / 122...140°F.
• Submerge electrode in 3 molar KCl solution at
ambient temperature. The decrease in temperature
will cause the reference half cell to suck in KCl
solution through the diaphragm and regenerate the
diaphragms functionality.
.book Page 38 Wednesday, July 4, 2012 9:52 AM