describe metrics formula with cavets description
pu930a_n2_dreThis new will calculate the removal efficiency of n2 contaminant by the PU930 Purifier beds. It is calculated based on the ratio of the outlet and inlet N2 ppm level.
The primary logic for the beds
pu930a_n2_dre = (1 - (ppm out/ppm in))*100 when PU930AMODE_STATE == 1