I-6
General Information
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
concentrated .than .standard .1, .increases .the .concentration .(dC
2
) .in .the .
sample .reservoir . . .Again, .the .new .potential .(E
2
) .is .measured .and .stored .
when .stable . . .Now, .we .have .the .following .three .unknowns: .
E
s
=E
o
+ S(T
s
/298.15) log (C
s
/C
iso
)
E
1
=E
o
+ S(T
1
/298.15) log [(C
s
+ dC
1
)/C
iso
]
E
2
=E
o
+ S(T
2
/298.15) log [(C
s
+ dC
1
+ dC
2
)/C
iso
]
S .is .the .Slope .at .25 .˚C .(298 .15 .K)
T .is .the .temperature .in .Kelvin, .measured .when .the .potential .E .is .measured .
E
s
, .E
1
, .E
2
.have .been .determined .during .the .calibration .procedure . . .The .
microprocessor .solves .these .three .equations, .to .obtain .the .values .of .S .
and .E
o
. . .The .calibration .result .is .stored .for .use .during .online .monitoring .
to .convert .the .measured .potential .and .temperature .in .the .sample .into .
concentration .values .in .either .ppm .or .ppb . .
When .the .calibration .is .complete .the .flow .cell .drains .as .the .sample .flow .
returns . . .The .flow .cell .volume .returns .to .the .measurement .level . . .After .
allowing .approximately .30 .minutes .for .concentrated .calibration .solution .to .
be .flushed .from .the .system, .the .Orion .2111LL .monitor .can .begin .sample .
measurement .again . .
In .addition .to .Double-Known .Addition .(DKA), .the .2111LL .also .allows .
the .user .the .ability .to .perform .an .offline .calibration .
The .offline .calibration .feature .of .the .Orion .2111LL .allows .the .user .to .
adjust .the .monitor .to .values .determined .by .alternate .methods .used .in .their .
laboratory .such .as .elemental .spectroscopy .and .ion .chromatography .
It .is .essentially .a .one .point .calibration . .To .perform .offline .calibration, .
a .sample .is .taken .from .the .bypass .of .the .instrument; .the .sample .
concentration .value .is .stored .in .memory; .the .sample .is .analyzed .by .an .
alternate .method .of .choice; .the .previously .stored .reading .is .adjusted .to .
the .lab .method .result; .and .the .instrument .is .then .returned .to .the .analysis .
mode . . .The .term .“offline .calibration” .refers .only .to .the .fact .that .a .sample .
from .2111LL .bypass .is .taken .“offline” .for .laboratory .analysis; .in .fact, .no .
downtime .is .experienced .during .the .procedure .and .the .instrument .remains .
online .throughout . .
Offline Calibration
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