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Troubleshooting
Air/water Spectrum from a System with Excess Water Vapor and a Relatively Small Air
Leak
•
If the ratio of the height of the peak of mass 18 (H
2
O
+
) to mass 19 (H
3
O
+
)
is about 10:1, there is little water vapor in your system.
•
If the ratio of peak height of mass 18 to mass 19 is less than 10:1 but
greater than 5:1, additional bakeout maybe necessary. Be aware,
however, that if you do not eliminate the water vapor, your system’s
sensitivity and performance may be less than optimal.
•
If the ratio of the peak height of mass 18 to mass 19 is much less than
10:1, your system contains excess water vapor.
An Air/Water Spectrum Obtained from a System with No
Significant Air Leaks and Little Water Vapor as Indicated by:
•
The peak at mass 18 (H
2
O
+
) may be the base (highest) peak. This is
dependent on the level of water vapor.
•
The ratio of the peak height at mass 18 (H
2
O
+
) to that at mass 19 (H
3
O
+
)
is greater than or equal to 10:1.
•
The 100% counts value is significantly lower than 500.
•
The ratio of the peak height at mass 28 to that at mass 32 (O
2
+
) is about
4:1.
6. If there are no air or water leaks in your system, you should obtain the following
approximate values. Please note that these values are only typical, so the actual
values may vary from system to system.
