resolution, using an internal calibrant during start-up. If the instrument reports no problems, thestatus LED shows green and the instrument is ready for use. If the check identifies a problem, thesoftware prompts you to start an automatic correction process. You can also inspect thequadrupole 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 inletYou can introduce sample into the QDa detector from an ACQUITY LC system or from a syringepump.If you are using an LC system, connect the ACQUITY QDa detector to the preceding instrumentin your system using the supplied probe assembly. You can use 250-mm or 500-mm probeassemblies, whichever best suits your configuration. If required, use a union to extend the lengthto fit with your configuration.If you are using a syringe pump, connect the QDa detector’s probe assembly directly to thesyringe pump.Recommendation: Where possible, use the 250-mm PEEK tubing. Doing so minimizes bandbroadening.Notice: To avoid the pressure exceeding the limits of the preceding instrument, ensurethat you use the recommended tubing size and lengths for your instrument.1.5 Vacuum systemAn internal turbomolecular pump and external backing pump create the instrument’s vacuum. ThePerformance instrument uses a separate rotary vane backing pump, and the Standard instrumentuses a diaphragm pump attached to the back of the instrument.Vacuum leaks, electrical failures, and vacuum pump failures cause vacuum loss, the damagefrom which is prevented by protective interlocks. The system monitors turbomolecular pumpspeed 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 versionThe information and procedures in this guide include variations based on the model of the QDayou are operating and maintaining. The following table and figures include some basic details tohelp you identify your instrument and to refer to the appropriate information for your version andmodel.June 15, 2017, 715003956 Rev. FPage 17
