Chapter 15 Maintenance and troubleshooting
15.2 Troubleshooting
F-52, 53, 54, 55 211
● The measured value is flashing
The pH value exceeds the measurement range (when pH value is displayed).
Measurement range: pH 0.00 to pH 14.00
The mV value exceeds the measurement parameters (when mV value is displayed).
Display range: ± 1999 mV
Ion measurement value is out of the range (in the ion mode).
Display range:0.0 μg/L to 999 g/L(mol/L)
The measured conductivity value exceeds the measurement parameters (when conductivity
value is displayed)
.
Display range:0.00 to 19.99 S/m (when cell constant is 100 m
-1
)
Check this point
As shown in the diagram, use a jumper wire
or bent paper clip to short the meter by
touching both the center pin and some metal
part in the electrode connector.
If the flaching measured value disappears
when this done, the meter is nomal.
● Key operation is invalid.
Cause How to solve problem
The sample solution
is inappropriate.
Change to a sample solution with properties
within the measurement range.
The liquid junction is
not immersed in the
sample solution.
Immerse the electrode up to 3 cm from its tip.
The electrode cable
has been severed.
Replace the electrode.
The meter has not
been calibrated or it
has been calibrated
incorrectly
.
Calibrate the meter correctly.
The main body of the
pH meter is defec
-
tive.
Check below.
The main body of the pH meter cannot be used for
measuring conductivity.
Cause How to solve problem
During PC communi-
cation
Press the ON/OFF key.
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