4
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Startup and Operation
Section
Section
Thermo Scientific
Orion 2295 Phosphate Analyzer
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25
Running an Analysis (Analyze Once)
Although the analyzer is usually set up to analyze sample streams on a regular schedule, you
may wish to execute an analysis on command to obtain an immediate result. This function
allows you to run single or multiple analyses on a sample without requiring that the automatic
mode be initiated. The analyzer then runs the specified number of analyses, tests for alarm
conditions, exercises the analog outputs, and prints the results exactly as if it were in the
automatic mode.
To run multiple analyses (more than one) set the number of repeats in ANALYSIS menu:
Press MENU
➔
SETUP
➔
(+) to go to page 2
➔
ANALYSIS PARAMETERS
➔
ENTER
➔
select NO. OF REPEATS
Instrument Operation Modes
1. SAMPLE ANALYSIS
2. CALIBRATION
The instrument also operates cleaning and post wash cycles, along with a priming function
useful for startup and priming feed tubing lines to the reaction-measuring cell.
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.
