
We investigate the phase structure of pure SU(2) LGT at finite temperature in the adjoint representation modified by a SO(3) invariant Z_2 monopole chemical potential. The decoupling of a finite temperature phase transition from the unphysical zero temperature bulk phase transitions is obtained and analyzed with special emphasis on the continuum limit, keeping an eye on its physical meaning and on universality. An effective symmetry breaking mechanism and a corresponding order parameter are proposed in the context of the monopole picture of confinement. Numerical results are presented for the Abelian projected theory after maximally Abelian gauge fixing. 