PROGRAMMING OF VRAE
4 - 15
Oxygen Sensor Calibration (Not applicable to PGM-7840)
The oxygen sensor calibration is slightly different from all
other sensors. The oxygen sensor measures a range from 0
to 30% of oxygen in the air. During “fresh” air calibration,
the oxygen sensor is calibrated to fixed 20.9% of oxygen.
During single sensor calibration, the user can supply a bottle
of pure nitrogen gas so that the oxygen sensor can be
calibrated to 0% of oxygen. The user can also supply other
span concentrations of the oxygen, e.g. 19.5%, to calibrate
the oxygen sensor. A question “0% oxygen?” will be asked.
Enter
[Y/+]
if pure nitrogen gas is used to calibrate the
oxygen sensor. Otherwise, enter
[N/-]
to calibrate the
oxygen sensor to another span oxygen value. During both
single or multiple sensor calibration, the oxygen sensor will
be calibrated to the span value defined in Section 4.4.4.
Note
: After a “0% oxygen” calibration, the user must
perform a fresh air calibration to ensure that the
oxygen sensor is calibrated correctly.
Calibration Time Stamp
When a single or multiple sensor calibration is performed, a
time stamp will be stored in the non-volatile memory. This
information will be included in the datalogging report.
