Hanna Instruments HI 9219, Instruction Manual, Page: 45 / 64

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TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE
Symptoms are:
The instrument does
not work with the ATC
probe.
The meter fails to
calibrate or gives er-
roneous results.
The meter is slow in
responding or gives
erroneous readouts
The meter does not
accept the 2nd buffer
solution
The reading drifts
" Err1 " on the display
" Err2 " on the display
(for HI9017 and
HI9318 only)
" Err3 " on the display
" Err4 " on the display
" Err5 " on the display
The problem is:
A defective ATC probe
A defective pH elec-
trode
The electrode is not
working or the dia-
phragm is clogged
A defective pH elec-
trode
A defective pH electrode
Out of range on the
pH scale
Out of range in mV
Out of range in tem-
perature
Erroneous buffer so-
lution used for offset
calibration
Defective electrode
Erroneous buffer so-
lution used for slope
calibration
Defective electrode
Possible Solutions:
Replace the probe.
Replace the electrode
and repeat the pH cali-
bration
Leave the electrode in a
storage solution after
cleaning the junction. If
the problem is not solved,
replace the electrode and re-
calibrate the pH scale.
Try the cleaning procedure.
If this does not work, re-
place the electrode.
Replace the electrode.
a) Verify the pH electrode
is connected.
b) Make sure the
sample's pH is included
between 0 and 14
c) Check the level of the
electrode's filling electro-
lyte and the state of the
electrode itself.
a) Verify the pH electrode
is connected.
b) Make sure the mV is
within ±1999 range.
Make sure the temperature
is within -10 and 125°C
Make sure that the buffer
solution used is pH 7 and
replace if necessary.
Replace the electrode
and re-calibrate pH
By sure the correct pH
solution is being used for
slope calibration.
Check the electrode and
replace if necessary.
Note: when the temperature display is showing " Err3 " the pH
display is always showing " Err1 ".