D U N I W A Y S T O C K R O O M C O R P .
20 of 30
Q. CCG-Cold Cathode Ionization Gauge with Other Gases
If you need to measure the pressure of gases other than air/nitrogen, refer to the following table:
Multiply the indicated pressure by the gas-species correction factor in the table to obtain the true
pressure.
Note: In a gauge calibrated for nitrogen,
where the dominant gas is other than nitrogen,
divide the gauge reading by the appropriate gas ionization factor
Figure 12: CCG Correction Factor for Gases Other Than Nitrogen
For example, if you are measuring the pressure in a system that is backfilled with carbon dioxide
(CO
2
), and the Model 960 display shows an indicated pressure of 1 x 10
-5
Torr, the true pressure
is 7 x 10
-6
Torr. (0.7 x 1 x 10
-5)
These data were compiled from a variety of sources and are believed to be reliable, however Du-
niway Stockroom Corp. takes no responsibility for errors in the data. If your application is critical,
we suggest you use the services of an independent laboratory to calibrate the CVT-275 gauge and
Model 960 controller to your specific application.
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
www.duniway.com
