The present invention relates to optical waveguide sensor devices. The isolator includes a handle for connection to a load and inner and outer members. Each processor is connected to all other processors via at least two physically separate networks. The piezoelectric element is oscillated with a vibration wave having a node on a diagonal line of the vibrating body. The needle assembly is slidably movable back and forth between a retracted position disposed substantially within casing and an extend position disposed substantially out of the casing through the needle assembly opening.