NAVI D-25 Instruction Manual page 178

D-52/53/54/55
Cause
There is no
reference
solution
remaining.
The wrong
reference
solution is being
used.
When there is a problem with the main unit of the
pH meter...
Cause
There is a motor
or other device
causing
electrical
interference.
The electrode is
not connected
correctly.
When there is a problem with the sample
solution...
Cause
The liquid
junction is not
immersed in the
sample solution.
Some effects of
the sample
6 Maintenance and Troubleshooting
How to solve problem
Fill the electrode with new reference
solution, as noted in the electrode
operation manual.
Use the correct reference solution.
How to solve problem
Move the meter to a place where it
is not subject to dielectric effects.
Be sure to ground devices that are
using commercial electricity.
Connect the electrode correctly.
How to solve problem
Immerse the electrode in the
sample solution up until the liquid
junction or deeper.
Determine if this is the cause by
measuring with a stable standard
solution.
6.5 Troubleshooting
167