Final answer:
To check for an oxygen deficient atmosphere prior to entering an empty storage vessel, you would use an oxygen sensor or a gas detector.
Step-by-step explanation:
The setup to check for an oxygen deficient atmosphere prior to entering an empty storage vessel involves using an oxygen sensor or a gas detector. These devices can measure the concentration of oxygen in the air and indicate if it is below a safe level. They are commonly used in industrial settings, confined spaces, and other environments where oxygen depletion can be a hazard.