Principles Of Operation - Thermo Scientific Orion 2111XP Manual

Section 1 | General Information
Figure 1: 2111XP Schematic
|
4 Orion 2111XP Sodium Analyzer

Principles of Operation

The sample enters the Thermo Scientific Orion 2111XP sodium analyzer and passes through
the inlet valve, bypass/needle valve, inlet filter, pressure regulator, flow meter and into the
restrictor tubing. The sample then passes through the flow cell manifold into a reagent bottle and
through a diffusion tubing assembly where pH adjustment takes place. The pH-adjusted sample
then flows back through the manifold into the flow cell as air is introduced from the air pump to
ensure proper mixing and fast response. The sample then flows into an atmospheric drain via
the diverter valve.
Analyzer
1 2 3 4
Power
4-20mA Output
Safety Drain for
Reagent Overflow
Calibration Level
Measure Level
Sample
Flow Cell Block
Valve Positions
Calibration Mode - PUSH
Sample/Measure Mode - PULL
Drain
The sensing electrode responds logarithmically to changes in the sodium ion concentration. This
response is described by the Nernst equation:
E = E + 2.3 (RT/nF) log (C/C
0
Where:
E = measured electrode potential, mV
E = potential, when C equals C
0
5
Restrictor Tubing
Check
Valve
Air Filter
Air Inlet
Pressurizes Flow Cell
to Initiate Siphoning
Calibration
Port
Regulator
Valve
Bypass / Needle
Valve and Filter
Cal
Inlet Valve
V V V a a a a l l l v lv v e e e
Reagent Manifold
Diffusion Tube
Reagent
Reagent Bottle Main Feed
)
iso
, mV
iso
K E Y
Electric
Fluid Path
Fluid Restrictor Tubing
Air Path
Reference Solution Path
Reagent Overflow Path
Diffusion Tubing
Thermo Scientific