Waters ACQUITY UPLC Operator's, Overview And Maintenance Manual page 120

8. Gently pull the right-hand side of the column heater toward you, and
then slide it to the right, to unseat the tab on the left-hand side of the
column heater from the instrument chassis.
9. Remove the leak sensor from its reservoir, grasping it by its serrations,
and pull upward on it, tilting it to the left.
Serrations
10. Unpack the new leak sensor.
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To avoid damaging the leak sensor, do not grasp it by the
Caution:
ribbon cable.