Dear Aswanth,

Cochin University of Science and Technology,  Kochi is the college in Kerala for Instumentation engineering for B.Tech course. 

According, to careers 360 it has AAAA ratings which means very good.

Ratings are based on Faculty, Placements, Cut-offs of national / state level Entrance exams, Accreditation and Reward status and Publication record from Elsevier’s indexing database - Scopus. 

Good Luck!!