Table 4-1 Scheduled Maintenance
Description Daily 12 Months 24 Months
Calibration check X
Replace the internal calibrated leak X
Replace diaphragm on DP pump (Dry
scroll
pump models only)
X
Replace tip seals on IDP-3 pump
(PD03 on
ly)
X
Table 4-2 As-Required Maintenance
Function Most Common Symptom
Spectrometer cleaning The spectrometer is designed to operate for years without
maintenance, however actual performance depends on the
leak detector operational environment. Spectrometer
cleaning restores optimum performance if the unit shows
significant sensitivity loss or high background signal.
Sensitivity loss appears as a high gain value after a
calibration or failure to calibrate with a gain too high error
message.
Filament replacement Filaments are designed to operate for
several years with no
maintenance. When a filament burns out, the system
automatically switches to the other filament and notifies
you to recalibrate. The calibration notice also serves to
inform you of a filament failure. Agilent recommends that
the burned out filament be replaced at a convenient time so
that a spare is always available during leak test operations
to prevent unplanned system down time.
Tuning adju s t m e n ts If calibration is not successful or if the system is calibrated
to an ex
ternal leak, tuning can maximize the helium signal.
Mechanical pump fluid change Persistent, high helium background signal. Fluid
contaminati
on (dirty brown color indicates burnt or
contaminated fluid, milky white consistency indicates high
water vapor content in fluid).
VS Series Helium Mass Spectrometer Leak Detectors
DRAFT 4/23/15
4-3
For simplicity, the maintenance functions in this section are grouped by recommended
frequency, as shown in Table 4-1, based on assumed daily use.
Maintenance functions that may be required on a demand basis, such as changing a
filament after filament failure, are listed in Table 4-2.
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