Hach-Lange POLYMETRON 9240 Operator Manual - Manual (Page 110)

108
Maintenance and Diagnostics
9.8 Calibration diagnostics
9.9 Raw values
9.10 Test accessories
This option is used by after sales service technicians to verify
that the last calibration was working correctly.
This option is used by after sales service technicians to verify
that the electrodes are functioning correctly.
This option allows you to check that a number of accessories,
as well as the alarm relays and logical inputs are functioning
correctly.