Just use the title used in your signing of the job contract. I think a Process Engineer Title is suitable enough. I guess you can also use Process Engineer Associate.
I just recieved this task to finish up a Ground-Fault Test. Currently working on a Light Rail track construction. I do different corrosion test along the track such as Stray Current testing, Resistivity test.. etc
I need to do a Ground-Fault Test.. But I am not sure of what kind of grounding...