NAVI D-25 Instruction Manual page 176

● ERR No.11 Cell constant out of range
D-52/53/54/55
Explanation
The cell constant is out of the range of 0.7 to 1.3. Delete
data stored in the memory after confirming their con-
tents.
Cause
COND electrode
is at the end of its
useful life.
Improper standard
solution
6 Maintenance and Troubleshooting
How to solve problem
Replace the electrode.
Prepare new standard solution.
6.5 Troubleshooting
165