Overheating / Dyr fire in RIMS

Is there any good way of protecting against overheating in a RIMS setup…
Lets say you get a stuck mash or forget a valve (personal experience) your element will heat up very quickly, and any liquid motion to your sensor will be lost so no temp reading…

  • flow sensor?
    -liquid sensor?
    -pressure sensor?
    -auto shut down over 100deg?

is there any good way of doing this??