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This variable determines length of time that zero gas is admitted into the measurement
cell before the zero calibration is performed. This value must be set to a long enough
interval to ensure that the cell is purged of all ozone before the calibration is performed.
The defaul value is 20 seconds.
7) AZERO_HOLD_OFF
This variable determines the length of time the instrument waits after the Auto-Zero
cycle before normal measurement is resumed. The default value is 5 seconds.
8) GAS_MOLECULAR_WEIGHT
This variable is the molecular weight of the carrier gas that the ozone is being measured
in. This value is used in the calculation of the wt% concentration unit. The default value
is 32.0 (for Oxygen carrier gas.)
9) CONCENTRATION _RANGE
This variable sets the full-scale concentration range for the analog output. A 15 wt%
concentration range means that 0-5 volts on the analog output will coorespond to a
concentration range of 0-15 wt%.
10) TPC_ENABLE
This variable enables temperature and pressure compensation for the calculation of the
ozone concentration. This variable should always be set to ON unless an external
correction is being applied to compensate for temperature and pressure changes.
11) STD_TEMP
12) STD_PRESS
These variables are the standard temperature and pressure that are used to calculate the
concentration when the units are set to grams per normal cubic meter (g/Nm
3
.)
13) RS232_MODE
This variable set the mode of operation of the RS232 interface. For more details on the
use of the RS232 interface, please contact Teledyne API and request document number
01350.
14) CLOCK_ADJ
This variable is used to make slight adjustments to the instrument’s internal clock so that
it keeps proper time. Setting this variable to a positive value will add that number of
seconds each day to the clock while a negative value will subtract that number of seconds
per day.
P/N 02826B1 Teledyne API Model 450H O
3
Monitor Instruction Manual - Page 37