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Theory of Measurement
Measurement in the Orion 2210AM Ammonia Analyzer is
done by measuring the absorbance of a single wavelength of
light through the sample, and comparing the result with the
absorbance of the same wavelength of light through a
standard solution of known concentration. If the two
absorbencies match, then the sample concentration is equal
to the standard solution.
To facilitate the comparison, the analyzer is first calibrated
with standards to determine the slope and intercept of the
range of concentration it can analyze, and then the
measurement of the unknown sample is interpolated along
the calibration curve to calculate the unknown concentration.
i.e., Concentration = (Slope x Absorbance) + intercept. Where
Slope and Intercept - Determined from Calibration.
Absorbance - Calculated through measurement.
The two variables (Slope and Intercept) are available for
editing in the calibration parameters menu screen.
Mode of Measurement
The Orion 2210AM Ammonia Analyzer is designed to provide
on-line process measurements, and has two modes of
operation. The mode is always displayed at the bottom right,
i.e., below the Info field and above the status field of the
display.
The two modes of the instrument are AUTO restart mode (the
instrument resumes auto analysis mode after 0.5 Hr of
inactivity) and MANUAL restart mode. The instrument awaits
the user to initiate the RUN or AUTO ANALYSIS mode by
pressing the RUN key.
To change the instrument mode, from MAIN MENU follow the
sequence:
➔
➔
MENU
SETUP
(+) ANALYSIS PARAMETERS
22 |
Calibration of the Instrument for Measurement Analysis
The instrument has two special keys to start and stop the
measurement. Pressing the RUN key starts the auto analysis
immediately and analysis repeats at the rate of the time set in
measurement frequency, which is selectable. During this
mode, the instrument displays RUN MODE indicating that the
instrument is running continuously.
To edit the measurement frequency, from the MAIN MENU
follow the sequence:
➔
MENU
SETUP
➔
SAMPLE FREQUENCY
The STOP key aborts the measurement at any stage
irrespective of the mode of the instrument.
NOTE:
Auto Restart Mode
The default mode of the instrument is auto restart. In this
mode, if the instrument keypad is untouched (i.e. stays idle)
for the period of auto restart idle time (default value of
30 minutes), then it automatically starts the measurement, the
mode is displayed as RUN MODE and repeats the
measurement as per the measurement frequency set in
analysis parameters.
If the STOP key is pressed during this measurement, it aborts
the measurement and will restart after the idle time
countdown expires.
To stop the auto restart of the instrument the mode should be
changed to manual restart:
➔
MENU
SETUP
Manual Restart Mode
This mode allows you to START the measurements manually.
To perform measurement on command from the MAIN MENU
follow the sequence:
➔
MENU
MEASUREMENT
Pressing RUN key in this mode keeps the instrument in RUN
MODE and pressing STOP key during measurement gets
back to the MANUAL RESTART mode. In this mode, if the
instrument is untouched for a period of the standby mode idle
time (60 minutes default), it switches to standby mode.
➔
MODE
➔
(+) ANALYSIS PARAMETERS
RUN is not the mode of the instrument. It
indicates that the instrument is
performing measurement continuously, at
the rate of measurement frequency.
➔
(+) ANALYSIS PARAMETERS
➔
ANALYZE ONCE
Orion 2210AM Ammonia Analyzer
➔
MODE
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