Waters Xevo TQ MS, Operator And Maintenance Manual, Page: 31 / 184

Leak sensors 1-15
structural information. However, in this ScanWave mode the cell accumulates
ions (intact or fragments) and then releases them, according to their mass, in
synchrony with the second quadrupole mass analyzer. This mode of operation
results in a significant increase in the signal intensity of full scan spectra.
ScanWave daughter scan mode
Typical application
See “Product (daughter) ion mode” on page 1-12 .
Leak sensors
Leak sensors in the drip trays of the Xevo TQ MS continuously monitor the
instrument 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 Instrument 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 (rotary vane) pump (a dry-pump option is available) and
two internal turbomolecular pumps create the source vacuum. The
turbomolecular pumps evacuate the analyzer and ion transfer region.
Vacuum leaks and electrical or vacuum pump failures cause vacuum loss,
which protective interlocks guard against. The system monitors the
turbomolecular pump speeds and continuously measures vacuum pressure
MS1
Scanning
Collision cell
ScanWave enabled
MS2
Scanning
(synchronized with
collision cell)