DO Calculation. Calculate the reading in mM and % made using a probe set at exactly mark of the tank, which is filled completely with 10 feet of medium, has additional 5 psi of pressure added, in the hypoxic conditions and 0.9 atm. Repeat calculations for normoxia conditions at 1 atm. Calculate oxygen depletion time in hours, if the cell density in the bioreactor is 7 MM/ml, and Oxygen consumption rate is 2 mM/hr.