I’m doing mechanical engineering and this subject is electric , all the requairment is provided in the attachment. 
All the resource must be taken from the file that is posted in the attachment file name; Fundamentals of sensing.pdf. 
If u really need more resource here are some links, 
List of website resources.
Rockwell Automation

http://www.ab.com/en/epub/catalogs/12772/6543185/12041221/12041225/Sensor-Application-Basics.html
http://blog.wika.com/knowhow/switching-function-hysteresis-pressure-switch/