Recommend Books for Instr. Engineering Calculations

For a scattered group of partial sources, ASCO valves has some good info on C_v calculations, Omega Engineering has lots of good temperature measurement background info, and Partlow controllers has some good PID loop explanations. I don't know off hand of a text that covers everything, but a search on something like "controls theory" would likely turn up a lot.

(I have no connection with any of these companies other than having read some of their literature.)

What else besides Cv? I could find a book or two with Cv calcs on my bookshelf, but what else would you include with general instrument related calculations?

Perry, "The Chemical Engineer's Handbook", any edition.