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3. Slope and offset corrections are made to the CO concentration according
to the equation:
CORRECTED CONCENTRATION =
SLOPE x MEASURED CONCENTRATION + OFFSET
4. The concentration value is linearized over the range of 0 to 1000 ppm by a
multi-point software look-up table and corrected for temperature and
pressure.
5. An average of the last 750 samples is computed and converted to the
number displayed on the front panel. This is the carbon monoxide
concentration. The number is also routed to the D/A converter and the
resulting voltage is output to the back panel.
4.3 Setting the time-of-day
To set the current time-of-day, which is used for determining when to do an automatic
calibration and for time-stamping the RS-232 reports, press SETUP-CLK-TIME. The
CPU will display the current time-of-day as four digits in the format "HH:MM", where
"HH" is the hour in 24-hour format (i.e. hours range from 00 to 23) and "MM" the
time-of-day and then press ENTR to accept the new time, or press EXIT to leave the
time unchanged.
4.4 Setting the date
To set the current date, which is used for time-stamping the RS-232 reports, press
SETUP-CLK-DATE. The CPU will display the current date as "DD MMM YY". For
example, April 1, 1990 would be displayed as "0 1 APR 9 0". Change the date by
pressing the button under each field until the desired date is shown. Then press ENTR to
accept the new date or press EXIT to leave the date unchanged.
4.5 Adjusting the clock speed
In order to compensate for clocks which run a little bit fast or slow, there is a variable to
speed up or slow down the clock by a fixed amount every day. To change this variable,
press SETUP-MORE-VARS. Press NEXT until the CLOCK_ADJ variable is
displayed. To change the setting, press the EDIT key and enter the value from the
keyboard.. Press ENTR to accept the change. This variable is set to the number of
seconds per day by which to speed up or slow down the clock. It should only need to be
set once for each Analyzer. For example, if the clock is running 10 seconds fast each
day, set the variable to -10 and press ENTR. (Note that -10 indicates that we want the
clock to run 10 seconds slower each day.) If the clock is running 10 seconds slow each
day, set the variable to +10, indicating that we want the clock to run 10 seconds faster
each day.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 40