SPX X-ray
Industrial Imaging System
Page 39 of 44
SPX Series System Manual
118173-001 Rev. D
and replacing the protective cover.
Recheck the pressure and inspect the
Tube Head for leakage.
Legend
– Tube Head
Pressurization Set Up
1.
Tube Head
2.
SF6 (sulfur hexafluoride) cylinder
3.
Cylinder Valve
4.
Pressure Gauge
5.
Charging Regulator Assembly
6.
Vacuum Line Valve
7.
Hose
8.
Hose
9.
Vacuum Pump
Temperature Compensation
As shown in Figure 7-2, temperature
changes cause SF6 gas to expand or
contract at the rate of 1 psi for every 7
o
F
increase/decrease in ambient air
temperature. Allowances for these changes
must be made when checking the Tube
Head gas pressure, or while
re-pressurizing/re-filling the Tube Head.
Figure 7-2 charts the maximum and
minimum pressure limitation of the Tube
Head at various temperature ranges. This
chart is to be used whenever the Tube
Head is inspected,
re-pressurized, or re-filled.
Note… It is standard practice to allow
both the gas supply and the Tube Head to
achieve room temperature before attempting
to re-pressurize. Temperature equilibrium
eliminates errors resulting from differences
between the gas supply and the Tube Head
temperatures.
Figure 7-1
Tube Head Pressurization Setup
Figure 7-2
Pressure vs Temperature Chart
Summary of Contents for SPX Series
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