66
A-96.250.631 / 280219
AMI Codes-II TC
Troubleshooting
7.2.
Calibration Errors
7.2.1
Process calibration tc2
Possible error
message
Slope error:
7.2.2
Process pH
Possible error
message
Offset error:
7.2.3
Standard pH
Possible
error message
Offset error or Slope error:
Possible cause
Corrective Action
Wrong manual measure-
ment.
Repeat the manual measurement.
Use fresh reagents.
Wrong reagent mixture
Reagents not complete-
ly solved in water.
Make a correct mixture.
Mix long and intensively.
Possible cause
Corrective Action
Manual measurement
wrong.
Repeat the manual measurement.
Slope of last calibration
wrong.
pH sensor dirty, old or
defect.
Clean or replace pH sensor, see
Maintenance of pH sensor, p. 58
.
Cable connector corroded.
Replace cable and sensor.
Possible cause
Corrective Action
Old, dirty or wrong buffer
solutions.
Check buffers expiration date if
necessary order new buffer.
Verify programmed buffer
values with the values of
the buffer solution used.
Change programmed buffer val-
ues or use correct buffer solution.
pH sensor dirty, old or
defect.
Clean or replace pH sensor, see
Maintenance of pH sensor, p. 58
.
Cable connector corroded.
Replace cable and sensor.
