The ornamental design for a triaxialsensorassembly, as shown and described.
FIG. 1 is a view of a triaxial sensor assembly of the present invention
from above and along an imaginary diagonal axis through the triaxial
sensor assembly; and,
FIG. 2 is a view of the triaxial sensor assembly of the present invention
from below and along the imaginary diagonal axis in a direction opposite
to that of FIG. 1.