990 CLD Autoline™ Leak Detector
4-8
DRAFT 2/2/04
Enhancement Magnet Adjustment
This adjustment is normally needed only after a new ion source has been installed.
To perform this adjustement:
❑
Slowly rotate the each large, black knob on the spectrometer tube through 360° to
find the respective points at which the leak rate reading is the greatest.
NOTE
It is possible to rotate each knob beyond 360° and thus repeat
the high-low reading, however, this is not recommended since
the knobs are preset at maximum at the factory prior to
shipment, and should require very minor adjustment.
Ion Source Replacement
The ion source has two filaments. The spare is turned on by the filament selector switch
(FILAMENT 1 or 2). Slight re-tuning may be necessary to obtain maximum sensitivity. It is
recommended that the ion source be replaced as soon as convenient after the spare filament
has been put into use. Replacement takes approximately three minutes.
To replace the ion source:
1. Turn off the MAIN POWER switch on.
2. Vent the vacuum system to atmosphere by first loosening the spectrometer tube KF
clamp, then carefully tipping the spectrometer tube from the turbo pump.
This causes an inrush of air that floods both the spectrometer tube and turbo pump.
The spectrometer tube can now easily be removed.
3. Remove the ion source connector at the spectrometer tube.
4. Remove the four screws that secure the ion source clamp, then gently slide the ion
source out of spectrometer tube body.
You can discard the ion source or return it to Vacuum Technologies for exchange.
5. Inspect the ground slit plate and ion source cavity to verify that they are clean.
If not, follow the applicable instructions in steps 5 through 17 in
“Removing, Cleaning, and Re-installing the Spectrometer Tube” on page 4-5 to clean
the spectrometer body and the ground slit plate.
6. Perform steps 19 through 32 in “Removing, Cleaning, and Re-installing the
Spectrometer Tube” on page 4-5 to install ground slit plate and ion source, and to
prepare the leak detector for operation.
Tool:
Phillips-head screwdriver
Part: Ion
Source
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