Pursuing an instrumentation career

Does anybody know which one of these petrochemical careers let you work mostly in the shop environment instead of outdoor work. The ones I'm interested in are I&E tech, analyzer tech, measurement tech, automation tech.
I&E (Instrumentation and Electrical) technician is more likely to work in a shop environment than the other options. I&E technicians are responsible for installing, repairing, and maintaining instrumentation and electrical systems in a variety of industrial settings, including petrochemical plants. They may work in the field, but they also often work in a shop environment where they can fabricate and assemble equipment.