Hanna Instruments hi 98140 User Manual
15
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.
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.
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.
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" paragraph for more details about "old probe" and
"dead probe" messages.
mV CALIBRATION PROCEDURE
(HI98150 ONLY)
A two or three-point calibration can be performed. The first two
calibration points are always 0 and +350 mV; the third point is
optional at +1900 mV.
1. Connect a mV simulator (HI8427 or HI931001 with the proper
calibration points are always 0 and +350 mV; the third point is
optional at +1900 mV.
1. Connect a mV simulator (HI8427 or HI931001 with the proper
connecting cable) to the meter and set it to 0 mV.
2. Press CAL when LCD is displaying mV.
3. Enter the password (if different from "0000")
3. Enter the password (if different from "0000")
with the arrow keys.
4. Press ALT and CFM to confirm the password or CAL to exit.
5. If password is correct, the meter will
5. If password is correct, the meter will
display "0 mV" on the lower LCD with the
"BUF 1" and "CAL" indication. The upper
LCD displays the mV reading.
"BUF 1" and "CAL" indication. The upper
LCD displays the mV reading.
6. When the "CFM" symbol blinks, the read-
ing is stable and calibration can be
confirmed.
confirmed.
7. Press ALT and CFM to confirm the first
value.
8. The LCD will display "Stor" for a few
seconds.
9. The meter will then display "350 mV" on
the lower LCD with the "BUF 2" indica-
tion.
tion.