Waters Xevo TQD, Operator'S, Overview And Maintenance Manual

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1-20 Specifications and Operating Modes
Leak sensors
Leak sensors in the Xevo TQD and the drip trays of the ACQUITY UPLC
system continuously monitor system components for leaks. A leak sensor
stops system flow when its optical sensor detects about 1.5 mL of
accumulated, leaked liquid in its surrounding reservoir. At the same time, the
ACQUITY UPLC Console displays an error message alerting you that a leak
has developed.
See
Waters ACQUITY UPLC Leak Sensor Maintenance Instructions for
complete details.
Vacuum system
An external roughing pump and an internal split-flow turbomolecular pump
combine to create the source vacuum. The turbomolecular pump evacuates the
analyzer and ion transfer region.
Vacuum leaks and electrical or vacuum pump failures cause vacuum loss, the
damage from which is prevented by protective interlocks. The system
monitors turbomolecular pump speed and continuously measures vacuum
pressure with a built-in Pirani gauge. The gauge also serves as a switch,
stopping operation when it senses vacuum loss.
A vacuum isolation valve isolates the source from the mass analyzer, allowing
routine source maintenance without venting.