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1) ALARM_BEEPER
This variable enables or disables the audible beeper that sounds whenever one of the
alarms has been triggered. The beeper sounds a slow beep if any of the ‘HI’ alarms are
active and sounds a fast beep if any of the ‘HI-HI’ alarms are active.
2) ANA_OUTPUT_MODE
This variable sets the Analog Output Mode for the Model 550 relay box accessory, if this
is installed. This variable has no effect on the analog output of the M450 itself. The
possible selections are: CURR (0-20mA or 4-20mA), 0.1V, 1.0V, 5V, 10V.
3) 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.
4) STD_TEMP, 5) STD_PRESS
These variables are the standard temperature and pressure that are used to calculate the
concentration when the units are set to Micrograms per Cubic Meter(g/m
3
) or
Milligrams per Cubic Meter(mg/ m
3
). These variables do not affect the ozone
measurement in PPM or PPB units.
6) RS232_MODE
This variable sets the mode of operation for the RS232 interface. For more details on the
use of the RS232 interface, please contact Teledyne API and request document number
01350.
7) 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 02395D1 Teledyne API Model 450 O
3
Monitor Instruction Manual - Page 44