990 CLD Autoline™ Leak Detector
4-2
DRAFT 2/2/04
Like other sensitive test equipment, a mass spectrometer leak detector requires periodic
maintenance to ensure continued reliable operation. For simplicity, the maintenance
functions in this section are grouped by recommended frequency, as shown in Table 4-1,
based on everyday use.
The sensitivity should always be checked at least once a day. However, other functions may
be carried out either more or less often, depending on the frequency of use.
Some maintenance functions may be required on a demand basis for example, changing an
ion source after filament failure. These functions are listed in Table 4-5 and also included in
the complete overhaul. Refer to “Annual Maintenance – Complete Overhaul” on page 4-3.
Figure 4-1
Scheduled Maintenance
Description Daily
Annually
Calibration check and tuning adjustments.
See “Tuning the Spectrometer Tube Using a Helium Reservoir Leak” on
page 3-6 and “Calibrating the Leak Detector” on page 3-7.
x
Complete overhaul, including spectrometer tube.
See “Annual Maintenance – Complete Overhaul” on page 4-3.
x
Table 4-5
As-Required Maintenance
Function
Most Common Symptom
Spectrometer tube cleaning.
See “Removing, Cleaning, and Re-installing the
Spectrometer Tube” on page 4-5.
Loss of sensitivity, increase in background, tuning
is high on ion dial (near 10)
Ion source replacement.
See “Ion Source Replacement” on page 4-8.
Filament failure – as soon as convenient after
second filament is in use
Cold cathode gauge cleaning.
See “Cold Cathode Gauge Cleaning” on page 4-9.
Instability in spectrometer tube pressure and leak
rate display. Also, whenever ion source is replaced.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
