Check or replace sample probe or outer needle

A faulty or broken needle can cause a fill time-out error or a dilution error.
If necessary replace the sample probe or outer needle.

Lift the robotic protection hood.

Needle exchange:

1. Unscrew sample probe manually.
2. Mark each tube for easier reconnecting to the correct nipple.
3. Disconnect the tubes from the outer needle.
4. Pull the sample probe, complete with outer needle, towards the front edge of the ESR analyzer unit.
   The outer needle must be supported to protect it from falling.
5. Slide the new sample probe into the (new) outer needle.
6. Make sure the Sample probe has a (new) O-ring QWLV050003.
7. Install (new) sample probe ESRI050909 together with the (new) outer needle ESRI050950.
8. Tighten the sample probe.
9. Replace the correct tubes on the outer needle.
10. Close the robotic protection hood.