NAVI D-25 Instruction Manual page 174

● ERR No.07 Cannot identify standard solution
● ERR No.08 Calibration cycle error
D-52/53/54/55
Explanation
If the automatic standard-solution identification function
of the meter does not work, recalibrate the meter after
performing the appropriate measures below.
Cause
There is a
problem with the
standard solution.
There is a
problem with the
standard solution
setting.
The responsive
membrane is dry
or dirty.
The reference
solution is
contaminated.
The responsive
membrane is
damaged or worn
out.
Explanation
This error appears when the number of measurements
set for the calibration cycle has been exceeded since the
last calibration was conducted.
Calibrate again.
6 Maintenance and Troubleshooting
How to solve problem
Prepare new standard solution.
Check the NIST or US standards
settings and the kind of standard
solution used for calibration, and
make sure they match.
Measure after washing the
responsive membrane and soaking
it in pure (de-ionized) water for 24
hours.
Replace the reference solution with
new solution.
Replace the electrode.
6.5 Troubleshooting
163