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4.0 SETUP MODE
This section describes the setup variables which are used to configure the Analyzer.
4.1 Setup mode operation
ALL the setup variables are stored in the Analyzer's EEPROM and are retained during
power off and even when new software revisions are installed.
NOTE
IF A VARIABLE IS MODIFIED, BUT ENTR IS NOT
PRESSED, THE VARIABLE WILL NOT BE CHANGED AND
THE ANALYZER WILL BEEP WHEN EXIT IS PRESSED.
4.2 Examining the carbon monoxide formula
slope and offset
The slope and offset parameters can be examined by pressing the <TST or TST> buttons
until the slope and offset test functions appear. The slope and offset parameters are set
only during zero and span calibration routines. These parameters are used to adjust the
span and zero values to their exact values.
The current value of the carbon monoxide reading that is displayed on the front panel and
output on the D/A terminals on the back panel is computed as follows:
1. Every 160 msec, the analyzer takes a CO MEAS reading (i.e. a reading of
the detector output with the IR beam passing through the N
2
cell of the
Gas Filter Wheel) and a CO REF reading (i.e. a reading of the detector
output with the IR beam passing through the CO Cell of the Filter Wheel).
2. A raw (uncorrected, un-linearized) CO concentration value is calculated
according to the following equation:
CONCENTRATION = GAIN_CONST x (1-CO_MEAS/CO_REF + ZERO_CONST)
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 39