  It is shown that S-N-S weak links with an heavy-fermion metal as the weak
link (N) can be useful thermosensors. This property is due to the large
thermopower of heavy-fermion metals which is of the order 10^(-6) V/K. The
longitudinal sound can also generate voltage oscillation due to the large
Grueneisen parameter, $\Omega_{hf}\sim 10^{2}$, in heavy-fermions. Similar
effects are expected with other Kondo systems as the weak link.
