37
36
SYMPTOMS
PROBLEM
SOLUTION
The meter fails to cali-
brate or gives faulty
readings
The meter is slow in
responding or gives
faulty readouts
The meter does not
accept the 2
nd
buffer
solution
The reading drifts
The meter does not
work with the tem-
perature probe
For HI 8424 only
Display shows "E1"
Display shows "E2"
Display shows "E3"
Display shows "E4"
Check the buffer solution and
replace it if necessary
Replace the pH electrode
Leave the electrode in a stor-
age solution after cleaning the
junction. If problem persists,
replace the electrode
Check the buffer solution and
replace it if necessary
Follow the cleaning procedure.
If this doesn't work replace
the electrode
Follow the cleaning procedure
and replace the pH electrode
if necessary
Replace the probe.
a) Check the calibration
b) Ensure that the pH value
is between 0 and 14
c) Check the level of electrolyte
and the state of the electrode
itself
Make sure the temperature
value is within 0 and 100°C
Make sure the mV value is
within ±1999
Make sure the buffer solution
used is pH 7 and replace it if
necessary
Replace the pH electrode
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
Erroneous buffer so-
lution used for
calibration.
An out of order pH
electrode
The electrode is not
working or the refer-
ence junction is
clogged
Erroneous buffer so-
lution used for slope
calibration
An out of order pH
electrode
A clogged or an out
of order pH electrode
An out of order probe
Out of range- pH
scale
Out of range- °C
scale
Out of range- mV
scale
Erroneous buffer so-
lution used for offset
calibration
An out of order pH
electrode
TEMPERATURE CALIBRATION
TEMPERATURE CALIBRATION
TEMPERATURE CALIBRATION
TEMPERATURE CALIBRATION
TEMPERATURE CALIBRATION
HI 8314, HI 8915, HI 8424, HI 9214, HI 931000
and
HI 9622
have been accurately precalibrated for temperature at the factory.
For optimum accuracy, it is recommended that you have your pH
meter recalibrated for temperature at least once a year.
Contact your Dealer or the nearest Hanna Customer Service Center for
more information.
m
m
m
m
mV OUTPUT
V OUTPUT
V OUTPUT
V OUTPUT
V OUTPUT
It is possible to attach the
HI 8915
to a recorder or plotter using the
mV output sockets.
pH, mV and °C readings can be transmitted through the output
sockets at a voltage that proportionally matches the displayed value.
For example, when the meter reads 2.00, 7.00 or 12.00 pH, it emits
a 200, 700 or 1200 mV signal, respectively.
This makes it unnecessary to use conversion tables and charts.
The output signals for the three measurement ranges of the meter are
100 mV for every pH unit, 1mV for every mV unit and 10 mV for
every degree centigrade.
