Rev. 0-401
9
Model GLI-98144 Portable pH/ORP Meter
"BUF 1" and "CAL" in-
dication. The upper
LCD displays the mV
reading.
6.
When the "CFM" sym-
bol blinks, the reading
is stable and calibra-
tion can be confirmed.
7.
Press ALT and CFM to
confirm the first value.
8.
The LCD will display
"Stor" for a few sec-
onds.
9.
The meter will then dis-
play "350 mV" on the
lower LCD with the
"BUF 2" indication.
10. Set the simulator to +350 mV.
11. When the "CFM" sym-
bol blinks, the reading
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
reading is stable. Press ALT and CFM to
confirm the third value.
17. Calibration is now complete, the instru-
ment returns to normal operational mode.
NOTE:
"WRONG" message notifies the user
if the selected value is wrong.
TEMPERATURE CALIBRATION
PROCEDURE
(for technical personnel only)
A two-point calibration at 0.0
°
C and 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 tem-
perature bath.
2.
Press ALT and CALT to enter tempera-
ture 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 tem-
perature bath.
8.
When the reading is stable the "CFM"
symbol starts to blink.
9.
Press ALT and CFM to confirm and re-
turn to normal operational mode.
