15
CALIBRATION ERROR MESSAGES
If the "old probe", "dead probe" or "WRONG" messages are displayed
during calibration, check your electrode by following the conditioning
and maintenance procedures and repeat calibration. The pH elec-
trode might have to be replaced if calibration cannot be successfully
performed.
Note
: See "GLP" section for more details about "old probe" and "dead
probe" messages.
CAL AutoEnd
If a wrong solution or electrode has been
used or if the buffer is polluted, "WRONG"
symbol will blink to alert the user.
10. If a single point calibration is required,
press CAL to exit the calibration mode and
maintain the previous slope calibration.
The instrument then checks the electrode
parameters and advises user of abnor-
malities by "old probe" and "dead probe"
indications.
11. Press the
or
keys to select the second buffer value. The
meter will display the "BUF 2" indication.
12. Rinse the electrode with some of the second buffer solution or clean
water.
13. Dip the bottom 4 cm (1½") of the pH electrode in a beaker
containing the second buffer.
14. When the "CFM" symbol blinks, press the
ALT and CFM keys to confirm the second
calibration point.
15. The LCD will display "Stor". The instrument checks the electrode
parameters and advises the user of abnormalities by "old probe"
and "dead probe" indications (in these cases, repeat the calibra-
tion with fresh buffers). If everything is satisfactory the meter is
calibrated and it returns to normal operational mode.
18
To store the current reading in memory press the LOG key while in
measurement mode. The LCD will display "Stor" along with the "LOG"
indication and the sample number for a few seconds.
By pressing the LOG key a complete set of information is memorized:
date, time, pH and mV readings, temperature reading and also a
message on the meter status.
Up to 500 samples can be stored into memory.
When the memory is full and the LOG key is
pressed, the sample will not be stored and
the LCD will display "FULL". In this case it is
necessary to delete all the memory to pro-
ceed.
TO VIEW LOGGED DATA
To retrieve the memorized information press the ALT and RCL keys.
The meter displays the date (upper LCD) and
the number (lower LCD) of the last logged
sample. The "ZERO" indication will be dis-
played if no samples are stored in memory.
• Select the desired sample number with the arrow keys. Pressing
the
key while the last sample is displayed causes the meter
to go to the first sample.
• Press the RANGE key to view the remain-
ing data of the selected sample. After
the date information, the remaining data
will be displayed in the following order:
LOGGING FUNCTION
RCL
LOG
ALT
RCL
FNC
LOG
GLP
RANGE
FNC
CFM
