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Spectrometer
Enhanced Product Safetey
BRUKER's AVANCE™ series of NMR spectrometers has been designed and constructed in conformity with the CE regulations.
The outer shell of the cabinets is not only RF proof, but also fire and shock resistant as well as mechanically stable and safe. The cabinet material is stainless steel, which is resistant to corrosion and oxidation and capable of withstanding chemically hostile environments. The bottom of the cabinet is constructed from a solid plate without openings so that, in the event of a fire in the cabinet, hot or burning material cannot fall onto the floor and cause additional damage or spreading of the fire.
To ensure the lowest possible levels of Electromagnetic Interference (EMI), RF shielding is a top priority. A special elastic, conducting mesh seals the doors to the blank metal of the cabinet frame.
Air outlets in the back panel are shielded with welded conducting grid plates. Each individual rf cable leaving the cabinet is separately shielded, and the shield is connected to the cabinet ground where it passes through the back panel.
With these extraordinary measures it is possible to obtain astonishing low EMI emission values, on the average 20 dB below the permitted limits, over the frequency spectrum of 30 - 1000 MHz. Below 30 MHz the conducted emission values on the 230 VAC mains supply have been kept well below the required limits through the use of highly effective line filters.
The entire internal AC supply of the console has been redesigned and planned to meet internationally recognized safety standards, in conjunction with the requirements of the German Technical Inspection Authorities (TÜV), and to minimize the risks of electric shock. The 230 VAC wiring within each cabinet is tested at 1.5 kV to ensure a high level of insulation between the wiring and the chassis. Immunity to electrostatic discharge is verified using voltages of up to 15 kV.
Each individual unit or mechanical part within the cabinet is carefully grounded. Safety grounding is individually tested to ensure values less than 0.1 ohm.
An innovative concept of ventilation, providing front-to-back instead of the traditional bottom-to-top air flow, has been implemented for each rack built into the cabinet. The warm air from each unit is guided directly through the back panel and out of the enclosed space so that its influence on the internal cabinet temperature and on the electronics is reduced considerably.