
VI-0
Troubleshooting
Thermo Scientific Orion 2111LL Sodium Monitor User Guide
ROSS and the COIL tradedress are trademarks of Thermo Fisher Scientific Inc. US Patent 6,793,787
Slope .greater .than .63 .mV
• . Improper .calibration .technique .– .Refer .to .
Chapter IV, Calibration
.
• . Calibration .standards .contaminated .– .Replace .with .new .standards . .
• . Electronics .failure .– .Try .to .reset .monitor . .Refer .to .
Chapter VI,
Resetting the Monitor
.
• . Improper .pipette .technique .– .Refer .to .section: .
Appendix A-11,
Pipette Operation
.and .
Technique
.
• . Background .concentration .too .high .for .standards .used .
• . Reference .and .sensing .cables .interchanged .– .verify .wiring .of .cable .
connections .to .terminal .strip . .Refer .to .
Chapter II, Wiring the
Instrument
.
• . 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 .reference .electrode . .
• . “Sensing” .for .the .sodium .electrode .
• . .Sensing .electrode .coated .– .Re-etch .or .replace .sensing .electrode .
High Slope
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