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THEORY OF OPERATION
Model 300E Carbon Monoxide Analyzer
Instruction Manual
184
P/N 04288 Rev: A
10.5.2.
Calibration - Slope and Offset
Calibration of the analyzer is performed exclusively in software.
During instrument calibration (see Sections 7 and 8) the user enters expected
values for Zero and Span via the Front Panel Keypad and commands the instrument
to make readings of calibrated sample gases for both levels. The readings taken
are adjusted linearized, and compared to the expected values, With this information
the software computes values for instrument slope and offset and stores these
values in memory for use in calculating the CO Concentration of the sample gas.
The Instrument slope and offset values recorded during the last calibration can be
viewed by pressing the following keystroke sequence:
SAMPLE
RANGE = 50.0 MGM CO =XX.XX
< TST
TST > CAL
SETUP
SAMPLE
TIME = 16:23:34
CO =XX.XX
< TST
TST > CAL
SETUP
SAMPLE
OFFSET = 0.000
CO =XX.XX
< TST
TST > CAL
SETUP
SAMPLE
SLOPE = 1.000
CO =XX.XX
< TST
TST > CAL
SETUP
10.5.3.
Measurement Algorithm
Once the IR Photo-Detector is signal is demodulated into
CO MEAS
and
CO REF
by
the Sync/Demod Board and converted to digital data by the Mother Board the
M300E analytical software calculates the ratio between
CO MEAS
and
CO REF
. this
value is compared to a look-up table is used, with interpolation, to linearize the
response of the instrument. The linearized concentration value is combined with
calibration slope and offset values, then normalized for changes in sample gas
pressure to produce the final CO concentration. This is the value that is displayed
on the instrument Front Panel Display and is stored in memory by the analyzer’s
iDAS system.
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