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Teledyne API Model 465L O
3
Monitor Operation Manual
48 05509F DCN6409
7.2.3.5. Span Calibration
The span calibration allows the instrument to calibrate its internal slope factor based on a known
ozone concentration. This should be done with a source of ozone span gas connected to the
“Sample In” port of the M465L. Allow the instrument to stabilize on the span gas source for a
minimum of 1 hour before performing the span calibration.
Figure 7-4 below shows the Span Cal menu. After the instrument has stabilized on the source of
span gas, navigate to the Span Cal menu (See
Figure 7-2) and Press ENT. Next enter the Span Target concentration (the actual concentration
of ozone being supplied to the monitor) and press ENT. The display will next show a
confirmation menu, ENT TO SPAN. Press ENT to perform the Span Calibration, or CFG to
abort back to the start. If the calibration is successful, the display will return to the concentration
menu and the monitor reading should change adjust to read very close to the target value. If the
calibration cannot be performed, an OUT OF RANGE error will be displayed. Press ENT to
confirm and the display will return to the start of the Span Cal menu.
If the OUT OF RANGE error occurs, it means the Span Cal cannot be performed because it
would result in an out of range slope value for the monitor. This means that either the sensor in
the monitor is malfunctioning, causing improper readings, or the actual ozone concentration
being supplied to the monitor is different than the target value being entered.
NOTE
A Span Calibration should only be performed with a precision
source of ozone calibration gas, such as a Teledyne API Model
700 or Model 703 calibrator. Simple ozone generators without a
measurement feedback system should never be used for
performing span calibrations.
If you are unsure regarding the suitability of a particular source of
calibration gas, contact Customer Service at Teledyne API for
assistance.