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Design and Function
Another function of the sample guide is to mechanically lock the conveyor chain. When a
conveyor chain link is positioned in proximity of the NMR access position above the BST,
the chain link contains a lot of deliberate play which makes it easier for the unit to align
on the correct position. When the conveyor chain link is stopped near the correct posi-
tion, the sample guide is activated and works as a conveyor chain block lever, whereas
the movable half shell (Figure 5.9/2) clasps the lower part of the conveyor chain link and
fixes it in the precise NMR access position required above the BST.
Figure 5.8 Sample Guide
1. Guide inactivated
2. Guide activated
Figure 5.9 Inside the Cassette
1. Sample Guide (active)
2. Moveable Half Shell
3. Fixed Half Shell
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