pyrostat

An automatic sensing device that activates an alarm or extinguisher in case of fire.

A high-temperature thermostat.

An apparatus for maintaining constancy of temperature; a thermostat; specifically, a thermostat for high temperatures.

An automatic draft-regulator for chimneys, smoke-pipes, and smoke-stacks. See draft-regulator, under regulator.

a thermostat designed to operate at high temperatures

a thermostat that operates at very high temperatures