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P/N 06160D DCN6409 Teledyne API Model 465M O
3
Monitor Instruction Manual - Page 38
7.2.3.5. Span Calibration
The Span Calibration also allows the instrument to calibrate its internal ozone offset
factor. The Span Calibration however, is done with some controlled concentration gas
connected to the “Sample In” port of the M465M. It is recommended that a span gas is
concentrated to around 80% of the operating range. Set the SPAN VALUE to the
measured concentration of your calibration gas. This normally takes 10-15 minutes.
See Figure 7-4 shows the Span Cal menu. After the instrument has stabilized on the
source of span gas, navigate to the Span Cal menu (See Figure 7-4) 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
While measuring zero air, a certain amount of noise or
“dithering” of the concentration about the zero point will occur
and is normal. This noise is typically 1-3 PPM in magnitude.
NOTE
A Span Calibration should only be performed with a stable
source of Ozone and a reference monitor measuring the same gas
supply.
If you are unsure regarding the suitability of a particular source
of calibration gas, contact Customer Service at Teledyne API for
assistance (see Section 12.)