990 CLD Autoline™ Leak Detector
DR
AFT 2/2/04
3-15
Startup and Shutdown
If the 990 CLD leak detector is to be idle for more than eight hours, the high vacuum
pump-bearing life can be prolonged by turning off the MAIN POWER switch. Main power
to the detector can also be cut without any damaging effects, as would be the case if the
console were part of a larger system.
Before lighting the filament:
1. Ensure that the spectrometer tube pressure gauge reads in the green band.
2. Ensure that the HIGH VAC PUMP READY LED is lit.
NOTE
The leak detector contains circuitry to prevent the filament from
being turned on if the pressure in the spectrometer tube is too
high. This circuitry also turns off the filament if the pressure in
the spectrometer tube rises to unfavorable levels. A
unintentional interruption in main power to the leak detector
causes the filament to turn off and the high vacuum pump to
shut down. When main power is restored, the high vacuum
pump recovers to its correct speed. The filament, however,
must then be re-lighted. The four set points are non-volatile,
thus they are not affected by interruptions of main power.
NOTE
The high vacuum pump controller in the leak detector protects
the high vacuum pump against over-temperature or
over-current conditions. However, for maximum high vacuum
pump life, design the system in which the leak detector is used
such that it can be powered only if backing pumps connected
to the leak detector are also powered. If any part of the leak
detector is to be removed from the vacuum system and
transported, pack the parts in their original shipping containers
with all appropriate protective covers in place. This minimizes
damage and contamination that can occur during shipping.
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