- Turbo power too low
- ACQUITY QDa Mass Detector
(partially) Blocked aperture disk
FIX or WORKAROUND
Replace the aperture disk.
The QDa does not have a vacuum gauge; the vacuum is monitored from the amount of power that the turbo pump needs to maintain its operating speed. The software has upper and lower limits to alert the user if there is a problem. If there is a leak, more power is needed. If the vacuum is too good, the need for power is lower.