Spellman SPX Series, Manual

Page: 42 / 51

SPX X-ray
Industrial Imaging System
Page 40 of 44 SPX Series System Manual
118173-001 Rev. D
Re-Filling the Tube Head
This procedure is used when the pressure within
the Tube Head has dropped below 5 psi @ 70
˚ F,
or after major maintenance on the Tube Head has
occurred. To re-fill the Tube Head, follow the
procedures outlined below while referring to
figures 7-1 and 7-2.
1) Remove the protective cover from the
SF6 cylinder (2) Remove the plug from
the cylinder va
lve (3) with a 3/8” Allen
Wrench. The cylinder valve outlet is left-
hand threaded.
Warning!
Extreme care must be exercised
while handling the cylinder so as
not to drop it after the protective
cover has been removed.
2) Connect the SF6 charging regulator
assembly (6) to the SF6 cylinder valve.
Note… the pressure regulator supplied
with the optional recharge kit is factory set to
50 psi @ 70
˚
F, and locked with a hex nut on
the adjustment knob. However, due to spring
tension aging, and/or various ambient
temperatures, this setting may need to be
updated.
3) Connect the vacuum pump (10) and the
Tube Head (1) to the regulator assembly
(6), using the hoses (7) and (8) as shown
in figure 7-1.
4) Leaving the SF6 gas cylinder valve (3)
closed, open the vacuum line (6) counter-
clockwise.
5) Start the vacuum pump and allow it to run
for at least 20 minutes for 160kV, (1 hour
for 200kV and 300kV units). The final
vacuum indicated on the regulator gauge
should be at least 25” Hg.
6) Close the vacuum line (6) and turn the
vacuum pump off. Open the SF6 cylinder
valve (3) to its’ fully open position (until
reaching its’ physical stop). Fill the Tube
Head until the gauge indicates 25 psi,
then close the cylinder valve.
7) Open the vacuum valve and run the pump
an additional hour. Close the vacuum line
and stop the pump. Open the SF6
cylinder valve again and fill the Tube
Head to the pressure indicated on the
“Pressure vs Temperature” chart
(Figure 7-2). When the Tube Head is at
the correct pressure, close the SF^
cylinder valve.
8) Remove the charging hose connection at
the Tube Head, secure the gas cylinder,
and replace the protective cover. Re-
check the pressure and inspect the Tube
Head for leaks.