Series 360, Granville-Phillips, Stabil-Ion, Ionization, Vacuum ...
Series 360, Granville-Phillips, Stabil-Ion, Ionization, Vacuum ...
Series 360, Granville-Phillips, Stabil-Ion, Ionization, Vacuum ...
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4 Preparing the <strong>Stabil</strong>-<strong>Ion</strong> System for Operation<br />
All conductors in, on, or around the vacuum system that are exposed to<br />
potential high voltage electrical discharges must either be shielded at all<br />
times to protect personnel or must be connected to earth ground at all times.<br />
Compliance with the usual warning to connect the power cable only to a<br />
properly grounded outlet is necessary but not sufficient for safe operation of<br />
a vacuum system with this or any similar high voltage producing product.<br />
Grounding this product does not and cannot guarantee that other<br />
components of the vacuum system are all maintained at earth ground.<br />
Finite Lifetime - After ten years of normal use or even non-use, the electrical<br />
insulation in this product may become less effective at preventing electrical<br />
shock. Under certain environmental conditions which are beyond the<br />
manufacturer’s control, some insulation material may deteriorate sooner.<br />
Therefore, periodically inspect all electrical insulation for cracks, crazing, or<br />
other signs of deterioration. Do not use if the electrical insulation has<br />
become unsafe.<br />
Do not touch the <strong>Stabil</strong>-<strong>Ion</strong> Gauge during degas operation if the Guard is<br />
removed. Serious burns can occur.<br />
The <strong>360</strong> <strong>Stabil</strong>-<strong>Ion</strong> System employs electron bombardment (EB) degassing of gauge electrodes,<br />
which is the most direct and efficient means to remove contaminants. High energy electrons striking<br />
the anode heat the anode and help remove any foreign materials while the increased cathode<br />
power cleans the cathode surface effectively. Of course, it is necessary to pump the contaminants<br />
from the gauge during degas. A system pressure below 10 -5 Torr is required to accomplish this<br />
effectively. Measurements below about 10 -8 Torr require degassing in the 10 -6 Torr range and again<br />
as the system approaches the ultimate pressure.<br />
Degas cannot be activated unless the <strong>Stabil</strong>-<strong>Ion</strong> Gauge pressure indication is below 5 x 10 -5 Torr<br />
(6.6 x 10 -5 mbar, or 6.6 x 10 -3 Pa) in the High pressure range, or below 1.2 x 10 -6 Torr (1.6 x 10 -6<br />
mbar, or 1.6 x 10 -4 Pa) in the Low pressure range. Degassing above this pressure is of little value and<br />
may cause pressure bursts that can cause an electrical gas discharge which can couple high voltage<br />
to the vacuum system hardware, shut down the <strong>Stabil</strong>-<strong>Ion</strong> Gauge, and in some cases cause<br />
damage—or create a shock hazard unless the system is properly grounded.<br />
Degas power may be turned on or off in<br />
three ways:<br />
■ Using the front panel degas<br />
push-button.<br />
■ Via the Remote Control input. See<br />
Section 3.7 on page 3-9.<br />
■ Using an RS-232 or IEEE 488<br />
Computer Interface module. See<br />
Section 4.12 on page 4-27 or Section<br />
4.13 on page 4-31.<br />
IG 8.56-7<br />
A 9.43-3<br />
B 5.67-2<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
IG1<br />
O<br />
O<br />
IG2<br />
O<br />
DEGAS ON<br />
O<br />
O<br />
Figure 4-3<br />
Control Unit Front Panel Showing Degas Button.<br />
4-6<br />
<strong>Series</strong> <strong>360</strong> <strong>Stabil</strong>-<strong>Ion</strong> December, 2001