... failure of open vessel, and high temperature, high pressure process conditions in the fields of petrochemical, power, food, pharmaceuticals ... . As the liquid level diminishing and spring constriction, the first – level magnet moves up to trigger the mechanical switch. ... M 20 X 1.5Explosion – proof grade: Exd IICT1 – T6 / Exia IICT1 – T6Protection grade: IP67Process connection: (Side mounting) DN25 PN4 ...