NAVI F-52, Instruction Manual

Page: 225 / 270

Chapter 15 Maintenance and troubleshooting
15.2 Troubleshooting
212 HORIBA
●
The temperature display is flashing.
The temperature measurement exceeds the
measurement range.
Measurement range: -10 to 105.0ºC
●
The temperature display does not change from 25ºC.
●
Measurements are not repeatable
Cause How to solve problem
The temperature of
the sample solution
exceed the measure-
ment range. Check the temperature of the sample solution
and change to a sample solution that has a
temperature within the measurement range.
The thermistor con-
nection within the
electrode is severed
or shorted. Measure the resistance of the temperature
sensor connector. If it is 50 k
Ω
or more at
room temperature, replace the electrode.
Poor connection of
temperature connec-
tor Firmly insert the temperature connector.
There is a problem
with the setting for
the temperature dis-
play calibration mode
(see Page 143). Perform the calibration of the temperature
sensor again.
The main unit of the
pH meter may be
defective. Contact with the nearest sales representative
if the trouble is not corrected by the above-
mentioned measures.
Cause How to solve problem
The effects of the
sample solution
.
The pH or other properties of the sample solu-
tion may have changed over time, making
reproducibility poor.
The responsive
membrane is dry or
dirty
.
Wash the responsive membrane
.
There is not enough
standard solution or
it is dirty. Replace the standard solution with a new
solution.
The responsive
membrane is
cracked or worn out.
Replace the electrode
.