Hanna Instruments HI 9023 - Manual (Page 13)

25
TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE
The meter is slow in re-
sponding or gives faulty
readings
The meter does not ac-
cept the 2
nd buffer
solution for calibration
The reading drifts
Display shows: "E1" or
Display shows: "E2" or
Display shows: "E3" or
Display shows: "E4" or
"WRONG
BUF
1 "
and/or
"WRONG "
Display shows: "E5" or
"WRONG
BUF
2
"
and/or
"WRONG "
The meter does not
work with the tempera-
ture probe
The meter fails to cali-
brate or gives faulty
readings
Display acts erratically
The electrode is not
working or the reference
junction is clogged
Out of order pH elec-
trode
Out of order electrode
Out of range pH scale
Out of range tempera-
ture scale
Out of range mV scale
Erroneous buffer solution
used for offset calibra-
tion
Out of order electrode
Erroneous buffer solution
used for slope calibra-
tion
Out of order electrode
Out of order temperature
probe
Out of order pH elec-
trode
The microprocessor has
been electronically dis-
turbed
Leave the electrode in a stor-
age solution after cleaning
the junction. If problem per-
sists, replace the electrode
Follow the cleaning proce-
dure. If this doesn't work
replace the electrode
Replace the pH electrode
a) Recalibrate
b) Make sure the pH
sample is in the 0 to 14
range
c) Check the electrolyte level
and the general state of
the pH electrode
Make sure the temperature
is in the 0 to 100 C (or 70
C) range and the probe is
plugged in
Electrode not connected
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the pH electrode
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the pH electrode
Replace the probe
Replace the electrode
Remove one of the batter-
ies for one minute to reset
the microprocessor
Symptoms Problem Solution
26
ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING
& MAINTENANCE & MAINTENANCE & MAINTENANCE & MAINTENANCE & MAINTENANCE
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is
normal with electrodes and they will disappear when rinsed with water.
During transport tiny bubbles of air may form inside the glass bulb
affecting proper functioning of the electrode. These bubbles can be
removed by "shaking down" the electrode as you would do with a
glass thermometer.
If the bulb and/or junction is dry, soak the electrode in
HI 70300 or
HI 80300 Storage Solution for at least one hour.
* Not present in gel electrodes.