Calibration
IV-13
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
The Thermo Scientific Orion 2120XP calcium hardness analyzer software
has default values to accommodate 0.50 mL additions of standard 1 and
standard 2 and flow cell volume of approximately 95 mL.
The operator has the option to use alternate standards by changing, in the
setup mode, the flow cell volume, the standard 1 and standard 2 values and
the volumes to be used.
Let V
C
= Flow cell volume
Default: 95.0 mL
C
1
= Standard 1 concentration
Default: 191 ppm
C
2
= Standard 2 concentration
Default: 1920 ppm
V
1
= Volume of standard 1 added
Default: 0.50 mL
V
2
= Volume of standard 2 added
Default: 0.50 mL
dC
1
= Concentration change due to the first addition
dC
2
= Concentration change due to the second addition
dC
1
= C
1
x V
1
/ (V
1
+ V
C
)
dC
2
= C
2
x V
2
/ (V
1
+ V
2
+ V
C
)
• dC
1
should be at least twice the normal concentration in the sample
• dC
2
should be about ten times of dC
1
• dC
1
should not be less than 10 ppb
Calibration At Custom
Concentrations
Using DKA
For Maximum Accuracy
