Calibration
IV-2
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
The sample reservoir in the flow cell, as shown in
Figure IV-1
, has two
sample volumes: a normal operation volume of 20 mL and a highly
accurate and individually calibrated flow cell volume of approximately
95 mL. The lower volume results in fast system response while online, and
the higher volume ensures accuracy in calibration.
When the Thermo Scientific Orion 2120XP calcium hardness analyzer is
first commissioned, it is advisable to flush out the fluidics system overnight
prior to the initial calibration and use. The electronics need not be turned
on at this time. Refer to
Chapter IV, Rinsing the Flow Cell
.
• For accurate volume displacement install the sensing electrode,
reference electrode and ATC probe in their respective flow cell cap
ports. Refer to
Chapter II, Installation of a New Calcium Electrode
;
Chapter II, Installation of the ATC Probe
and
Chapter II,
Installation of a New Reference Electrode
.
• Close the calibration port.
• When rinsing the flow cell before a standard calibration, be sure to
rinse off the inside of the reservoir lid with deionized water to prevent
build up of calcium hardness contamination along the lid.
• To ensure the analyzer achieves stability and to minimize interference
during calibration, the operator should minimize activity on the system
during calibration.
Measure Level
Flow Cell Block
Calibration Level
Calibration Port
Sense
REF
TEMP
Flow Cell Operation
Figure IV-1
Recommendations
