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16
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 (
HI98150
only) 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 ALT and RCL.
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 RANGE to view remaining data of the
selected sample. After the date information,
the remaining data will be displayed in the
following order:
LOGGING FUNCTION
TEMPERATURE CALIBRATION PROCEDURE
(for technical personnel only)
A two point calibration at 0.0, 50.0°C has to be performed in order
to store the new calibration data in memory.
1. Immerse the pH electrode with the built-in temperature sensor in
the 0°C temperature bath.
2. Press ALT and CALT to enter temperature calibration mode.
3. Enter the password.
4. The meter will display "0.0 °C" on the lower LCD with the "BUF 1"
and "CAL" indication.
5. When the reading is stable the "CFM" symbol starts to blink.
6. Press ALT and CFM to confirm. LCD will then display 50.0°C on
the lower LCD with the "BUF 2" indication.
7. Immerse the pH electrode with the built-in temperature sensor in
the 50°C temperature bath.
8. When the reading is stable the "CFM" symbol starts to blink.
9. Press ALT and CFM to confirm and return to normal operational
mode.
10. Set the simulator to +350 mV.
11. When the "CFM" symbol blinks, the read-
ing is stable. Press ALT and CFM to
confirm the second value.
12. The LCD will display "Stor" for a few seconds.
13. If only a two-point calibration is required, press CAL to leave the
calibration mode. Proceed with the next step for three-point
calibration.
14. The meter will display "1900 mV" on the
lower LCD with the "BUF 3" indication.
15. Set the simulator to 1900 mV.
16. When the "CFM" symbol blinks, the read-
ing is stable. Press ALT and CFM to
confirm the third value.
17. Calibration is now complete, the instrument returns to normal
operational mode.
Note:
"WRONG" message notifies the user if the selected value is
wrong.
