Waters Xevo TQ MS Operator's, Overview And Maintenance Manual page 6

High temperature hazard
Warning:
assembly when operating or servicing the instrument.
Xevo TQ MS high temperature hazard:
T Q T Q
M S M S
vi February 11, 2013, 71500130002 Rev. D
To avoid burn injuries, avoid touching the source ion block
Source ion block assembly
TP03127