Troubleshooting
VI-10
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
Slope greater than 34 mV/decade
• Improper calibration technique – refer to
Chapter IV, Performing a
DKA Calibration
.
• Calibration standards contaminated – repeat the calibration using
fresh standards.
• Electronics failure – reset the analyzer. Refer to
Chapter VI, Resetting
the Analyzer
.
• Improper pipet technique – refer to the
Appendix, Pipet Operation
and Technique
section.
• Background concentration too high for the standards used.
• Cables interchanged – verify wiring of cable connections to terminal
strip. Refer to
Chapter II, Wiring the Analyzer
.
• Check the connection of the cable markers for the corresponding
electrode. Cable markers are the white tape at the cap connector on
the cable.
• “Ref” for the reference electrode
• “Sensing” for the calcium electrode
• Sensing electrode coated – clean or replace the sensing electrode.
High Slope