Cleaning The Source Components - Waters Xevo TQ-S Operator's, Overview And Maintenance Manual

4 Maintenance Procedures
Use of the gas ballast control
In normal use, the gas ballast control should be off (no-gas ballast).
To select no-gas ballast, turn the control position to 0. Doing so pumps gases
fully, achieving ultimate vacuum.
To select low-flow gas ballast, turn the control to position I for approxiamtely
one hour. Use this position when the backing pressure reading is higher than
usual.
High-flow gas ballast position II is not recommended because it
Important:
accelerates tip-seal wear.

Cleaning the source components

Clean the sample cone and cone gas nozzle when these conditions apply:
• The sample cone and cone gas nozzle are visibly fouled.
• LC and sample-related causes for decreased signal intensity have been
dismissed.
See "Cleaning the sampling cone assembly" on page
If cleaning the sample cone and cone gas nozzles fails to increase signal
sensitivity, also clean the ion block and isolation valve (see
If cleaning the ion block and isolation valve fails to increase signal sensitivity,
also clean the StepWave assembly (see
128 February 28, 2014, 715002212 Rev. C
129.
page 152).
page 139).