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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
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
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.)
See Figure
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.
P/N 06160D DCN6409 Teledyne API Model 465M O3 Monitor Instruction Manual - Page 38