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Sample Analysis and
Validation
The SAMPLE ANALYSIS mode is similar to the calibration
mode, with the exception that during calibration the
instrument calculates the relevant parameters correlating to
the standard concentrations used for calibration.
During sample analysis, the system relies on the CURRENT
calibration parameters to calculate the sample concentration.
Each measurement cycle starts with flushing the reaction cell
with fresh sample. An auto blank step makes sure that the
background color of the sample is measured as a baseline.
Typically, reagents are added to develop the color of the final
compound, and the intensity of the color developed is
measured and correlated to the sample concentration.
The validation cycle is similar to the measurement cycle
except that the result is not reported on the analog loops and
not stored in the sample analysis results data storage. The
result of the validation analysis is displayed and printed on the
RS-232 port. The validation cycle can be executed on any
available solution standard or sample selected by the user in
the validation setup parameters menu.
Calibration
The user may execute manual or set automatic calibration
cycles at user defined intervals. In the auto mode, the analyzer
calibrates periodically and checks the validity of the calibration
per the specified tolerance for the REFERENCE slope and
offset parameters. New calibration data is only accepted if it is
within the limits of the specified tolerance for the REFERENCE
calibration parameters. The current column shows the current
operating parameters that are used to calculate the sample
concentration.
Cleaning
Automatic flushing of the reaction cell may be programmed.
The default setup for the analyzer uses the sample as the
cleaning solution. A cleaning cycle can be performed by
pressing:
➔
➔
STOP
MENU
MEASUREMENT
This cycle helps maintain clean reaction cell.
18 |
Startup and Operation
➔
CLEAN
To avoid damage and contamination to
NOTE:
the reaction cell, use only cleaning
solutions recommended by the factory.
Post Wash
Automatic post wash cycles are typically part of every
measurement cycle. At the end of the analysis, the post wash
cycle evacuates the reacted sample from the cell and cleans it
to minimize coating and residue deposits in the cell. The post
wash cycle settings can be accessed from the ANALYSIS
PARAMETERS menu:
➔
➔
MENU
SETUP
(+) ANALYSIS PARAMETERS
Please consult factory before modifying any of the
parameters.
Priming
Priming of the instrument lines may be done as auto (all the
solutions) or manually by selecting the specific reagent or
standard. Priming fills the tubing, purges the lines of air, and
prepares the analyzer for measurement mode.
The PRIME VOLUME in mL applies to all the listed solutions in
the priming menu.
The Prime Volume may be specified as a (-) number; this
allows the user to pump back the reagents inside the tubing
back into the reagents containers allowing for safer service
when replacement of the tubing is needed. User may select to
pull back all or any one of the reagents or standard.
➔
Orion 2210AM Ammonia Analyzer
(+)
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