Prerequisites For X-Ray Generation; Description Of The X-Ray Safety System - Bruker S8 TIGER Manual De Instrucciones

S8 TIGER X-ray Spectrometer

Prerequisites for X-ray Generation

X-rays will be generated only if each of the following conditions is met:
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Both safety circuits have been enabled by the S8 TIGER's safety system (the S8's microproces-
sor will enable the safety circuits only if all self-tests and plausibility checks of safety-relevant
components have been completed successfully).
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The sample seal is closed and all switches monitoring its position indicate the status "Seal
closed".
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All side panels have been mounted correctly.
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The tripline switches, which monitor the X-ray source and the sample seal cover, are closed.
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The cathode heater voltage has been switched on by turning the key switch.
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All four X-ray warning displays are illuminated. (Each 'X-rays on' warning display, as shown in Fig.
2-1, consists of two illuminated panels: one on the front of the instrument and one on the side.)
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The optional external warning display is turned on (if installed).
A fail-safe time delay unit prevents the sample seal from opening before X-ray high voltage has been
turned off completely.

Description of the X-ray Safety System

The S8 TIGER has two electromechanical safety circuits. The detailed wiring schematics and block
diagrams are available inside the supplementary S8 TIGER folder which is shipped with the instru-
ment. Both circuits are totally independent. A microcontroller monitors all components of the safety
circuits and continuously performs plausibility and functionality checks.
In the event of any error that affects the X-ray radiation safety, the two safety circuits will be inter-
rupted and the X-ray radiation will be switched off. The two safety circuits control the two contactors
(K52 and K53, located inside the X-ray generator) that enable the generation of high voltage. The
error condition will be saved in the microcontroller's nonvolatile flash memory. Consequently, the
safety controller will block the X-ray generator by disabling relays K1 and K2. Even after powering off
and powering back on, it is not possible to turn on X-rays. In order to enable X-rays again, the error
DOC-M80-ZXX031 V4 – 02.2010
Introductory User Manual
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