Instruction Manual
Model NGA 2000 TO2
a.Calibration Procedure
The TO2 analyzer module is fully factory calibrated prior to shipment using certified gas standards. If the analyzer is operated within its specified operating conditions, no regular calibration is required. The zero calibration is very stable and does not require checking more than once a year.
Gas Scale Factor
The Gas Scale Factor is used to correct for background gases other than nitrogen. When the background of the sample is
other than nitrogen, the diffusion rate of oxygen into the sensor changes. By cor- recting for the background difference, the diffusion change can be compensated in software. The GSF can be entered manu- ally or calculated automatically. Calcula- tion of the GSF requires the user to enter the sample gas composition. In most ap- plications, the GSF is not required. How- ever, some backgrounds exhibit significantly different diffusion character- istics versus nitrogen (such as helium or hydrogen) and the GSF may improve performance.
Set the Gas Scale Factor as follows:
Rosemount Analytical Inc. A Division of Emerson Process Management |
