Waters Xevo G2 QTof, Operator'S, Overview And Maintenance Manual, Page: 33 / 248

Leak sensors 1-15
Leak sensors
Leak sensors in the instrument’s drip trays continuously monitor for liquid
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 Instrument Console displays an error message alerting you that a
leak has developed. See Waters ACQUITY UPLC Leak Sensor maintenance
instructions (part number 71500082506) for complete details.
Vacuum system
An external roughing pump and three internal turbomolecular pumps
maintain the instrument’s vacuum.
Protective interlocks guard against vacuum leaks and electrical or vacuum
pump failure. The system monitors the turbomolecular pump speeds and
continuously measures vacuum pressure with built-in gauges. The gauges
also serve as switches, stopping operation when vacuum loss is sensed.
A vacuum isolation valve isolates the source from the mass analyzer, allowing
the sample cone to be cleaned without venting the instrument.