VS Series Helium Mass Spectrometer Leak Detectors
2-10
DRAFT 4/
23/15
Table 2-4 Leak Detector Condition States
Display Description
Backing Indicates that the leak detector is momentarily backing the foreline of the
high vacuum pump during an extended rough period. Backing occurs if the
roughing time is greater than 60 minutes or if the turbo pump is not ready.
Both Filaments
Burned Out/ No
Emission
Indicates that no filament emission is detected. This can result from a PCB or
cable problem, or burned out filaments.
Cal OK Indicates that the calibration routine was executed successfully.
Calibration Prep Indicates that the leak detector is preparing for a calibration routine.
Filament 1
Burnt Out
Indicates that filament 1 of the ion source has burnt out. Filament 2
automatically lights if it is still good, and a flashing C appears in the leak
rate
exponent, indicating that a calibration routine is required.
Filament 2
Burnt Out
Indicates that filament 2 of the ion source has burnt out. Filament 1
automatically lights if it is still good, and a flashing C appears in the leak
rate
exponent, indicating that a calibration routine is required.
Filament Wait Indicates that the system is lighting the filament.
Flashing C On
Exponent Display
Indicates that the leak detector requires calibration.
Gain Too High Indicates that the gain value required to calibrate the leak detector during the
calibration routine is greater than the maximum allowable value. This is
generally the result of system sensitivity being too low, due to normal system
aging.
Gain Too Low Indicates that the gain value required to calibrate the leak detector during the
calibration routine is less than the minimum allowable value. This is generally
the result of a system leak.
High Background Indicates a high Helium background detected during calibration self-test. This
typically, indicates a VS vacuum system leak.
No Ion Peak Indicates a tuning/calibration failure due to the system not detecting an ion
peak during the auto-tuning routine.
Offset Fault Indicates an electronics failure identified during calibration self-test.
Offset Wait Indicates that the system is setting the Offset value.
Reject Indicates a test object failure during an Auto Sequencer Test cycle.
See
Section 2.2.4.3 “Auto Sequencer” on page 2-22.
Spec-Tube Flashes red when the spectrometer pressure > 1.0E-4 Torr.
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