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resolution, using an internal calibrant during start-up. If the instrument reports no problems, the
status LED shows green and the instrument is ready for use. If the check identifies a problem, the
software prompts you to start an automatic correction process. You can also inspect the
quadrupole resolution and mass scale calibration on demand without powering-off the instrument.
To learn how to enable start-up checks, see the instrument’s online Help.
1.4 Sample inlet
You can introduce sample into the QDa detector from an ACQUITY LC system or from a syringe
pump.
If you are using an LC system, connect the ACQUITY QDa detector to the preceding instrument
in your system using the supplied probe assembly. You can use 250-mm or 500-mm probe
assemblies, whichever best suits your configuration. If required, use a union to extend the length
to fit with your configuration.
If you are using a syringe pump, connect the QDa detector’s probe assembly directly to the
syringe pump.
Recommendation:
Where possible, use the 250-mm PEEK tubing. Doing so minimizes band
broadening.
Notice:
To avoid the pressure exceeding the limits of the preceding instrument, ensure
that you use the recommended tubing size and lengths for your instrument.
1.5 Vacuum system
An internal turbomolecular pump and external backing pump create the instrument’s vacuum. The
Performance instrument uses a separate rotary vane backing pump, and the Standard instrument
uses a diaphragm pump attached to the back of the instrument.
Vacuum leaks, electrical failures, and vacuum pump failures cause vacuum loss, the damage
from which is prevented by protective interlocks. The system monitors turbomolecular pump
speed and continuously measures turbo power. The turbo speed also serves as a switch,
stopping operation when it senses vacuum loss.
1.6 Identifying your instrument version
The information and procedures in this guide include variations based on the model of the QDa
you are operating and maintaining. The following table and figures include some basic details to
help you identify your instrument and to refer to the appropriate information for your version and
model.
June 15, 2017, 715003956 Rev. F
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