VI-9
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
Less .than .45 .mV
• . Check .electrode .function, .etch .electrode, .recalibrate, .if .continues .to .
read .low, .replace .electrode . .
• . Check .electronics .to .read .mV .input .correctly . . .Use .electronic .test .kit .
(Cat . .No . .180029) .procedure .for .checking .electronics .function . .
• . Background .concentration .too .high .for .standards .used .
. Ion-selective .electrodes .(ISEs) .can .be .shown .as .DC-voltage .sources .with .
50 .to .1000 .Mohm; .a .very .high .output .impedance . . .ISEs .respond .to .
ion .concentration .changes .with .a .voltage .change .of .approximately .60 .
mV/decade .for .monovalent .ions .as .sodium . . .Knowing .electrode .and .
instrument .parameters .like .offset .potential, .slope, .etc ., .allows .testing .of .
various .instruments .by .applying .a .known .mV-voltage .
Input Signal
Expected Reading: ± (0 .5 mV + 0 .%)
0 mV
- 0.5 mV to + 0.5 mV
- 1000 mV
-1001.5 mV to – 998.5 mV
+ 1000 mV
+ 998.5 mV to + 1001.5 mV
• . Standards .contaminated .or .incorrectly .made . . .Verify .fresh .standards . .
• . Standard .1 .and .standard .2 .interchanged .– .Check .values .on .standards . .
• . Standard .1 .value: .19 .1 .ppm
• . Standard .2 .value: .192 .ppm
• . If .using .custom .standard, .verify .values .for .each .addition .
• . pH .adjustment .is .not .correct . . .Check .level .and .flow .for .DIPA .reagent . .
Replace .DIPA .if .contamination .or .level .is .less .than .50 .mL . .Refer .to .
Chapter II, Installation of Reagent & Diffusion Tubing
.
• . Standard .1 .and .standard .2 .added .in .wrong .sequence . .Refer .to . .
Chapter IV, Calibration
.
Slope Problem
Low Slope
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