General Information
I-3
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
The sample enters the Thermo Scientific Orion 2120XP calcium hardness
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 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.
Principles of Operation
Safety Drain for
Reagent Overflow
Restrictor Tubing
Pressurizes Flow Cell
to Initiate Siphoning
Flo
w
M
et
er
Valve Positions
Calibration Mode - PUSH
Sample/Measure Mode - PULL
Analyzer
1
2
3
4
5
Power
4-20mA Output
Air P
ump
Flo
w
M
et
er
Inlet Valve
Bypass / Needle
Valve and Filter
Regulator
Valve
R
ef
er
en
ce
S
o
lu
tio
n
Calibration
Port
Se
n
se
REF
TEMP
Flow Cell Block
Calibration Level
Air Filter
Reagent
Reagent Bottle
Diffusion Tube
Reagent Manifold
Fluid Path
Fluid Restrictor Tubing
Electric
Air Path
Reference Solution Path
Reagent Overflow Path
Diffusion Tubing
K E Y
Main Feed
Air Inlet
Measure Level
Drain
Check
Valve
Sample
Valve
Valve
ve
al
Val
Cal
Figure I-1
2120XP Schematic