Figure 10.

Illustrative example of a SPC chart depicting log RLU from the crate sorting bars using a Charm novaLUM II-X (top), 3M Clean-Trace (middle), or Neogen AccuPoint (bottom) ATP luminometer. A cleanliness threshold was established as +3σ of observations above the mean observations for each luminometer. The calculated cleanliness threshold for each unit was 5.91 log (813,679 RLU) for the Charm novaLUM II-X, 3.90 log (7,958 RLU) for the 3M Clean-Trace, and 3.63 log (4,277 RLU) for the Neogen AccuPoint