Operation
SPECTRO XEPOS — 19.01.2017 — 39
5.7 Dust protection shutter / beam stabilization vacuum shutter
(option)
Dust protection shutter
The "Dust protection shutter" reduces the risk of contamination of the excitation
chamber during the standby mode while the sample chamber is being cleaned
(see Chapter 6.5) as well as during the removal or insertion of the sample tray into
the sample chamber (see page 38).
Functionality:
During the initialization of the device (see Chapter 5.3.3) and after completion of
the measurement, the dust protection shutter is moved automatically above the
excitation chamber and lowered into it.
Beam stabilization vacuum shutter
Devices that are equipped with the vacuum option (see chapter 4.3) use the
shutter as "beam stabilization vacuum shutter". In addition to reducing the risk of
contamination of the excitation chamber, the chamber is evacuated during the
standby mode. The evacuation of the excitation chamber has two main
advantages:
The evacuation results in a significantly lower mechanical load on the
beryllium window of the x-ray tube, which increases the service life of the
tube.
No load of the used crystal due to humidity. This leads to a better stability of
the analyzes.
When measurements are performed in air or using helium flushing, the system
requires at least 60 minutes to return to the state of highest stability and precision.
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