Waters Xevo TQD Operator's, Overview And Maintenance Manual page 55

3. With the probe label facing you, carefully slide the ESI probe into the
hole in the probe adjuster assembly, ensuring that the probe location
dowel aligns with the location hole of the probe adjuster assembly.
Probe label
Caution:
tighten the probe locking ring.
4. Tighten the probe locking ring to secure the probe in place.
An automatic pressure test runs when the probe is correctly seated.
Tip:
5. Connect the ESI probe's cable to the high-voltage connector.
TP03129
To avoid failure of the automatic pressure test, fully
Probe locking ring
Probe location dowel
Location hole of the probe
adjuster assembly
ESI mode 3-3