Calibration
IV-14
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
Span Check
Procedure
The Thermo Scientific Orion 2120XP calcium hardness analyzer remains
in the sample mode during the entire procedure.
1. Fill the flow cell to the calibration level (V
0
, approximately 95 mL).
2. Record the concentration displayed when the reading is reasonably
stable (C
0
).
3. Add standard 1, volume V
1
, with concentration C
1
.
4. When the reading is reasonably stable, record the concentration (C
S
).
5. The recorded value should be within ± 10% of the calculated value
according to:
C
S
= (C
0
x V
0
+ C
1
x V
1
) / (V
0
+ V
1
)
• C
1
should be the concentration actually on the standard bottle.
