Abstract: A tamper resistant temperature dial and associated method of use is disclosed. This includes a temperature adjustment device associated with a controller for a heating device that includes a rotatable dial for setting temperature in the heating device, a ring that is operatively attached to the rotatable dial or the controller, wherein the ring includes a plurality of notched portions, and a resilient detent having a first portion engagable with at least one of the plurality of notched portions on the ring, a second portion for releasably applying pressure to the resilient detent for disengaging the first portion of the resilient detent from the at least one of the plurality of notched portions on the ring and having a third portion that is operatively attached to the attached to the controller or the rotatable dial. The heating device can be either electric or gas.

Abstract: A safety device for shutting off the flow of gas to a gas-fired appliance in the presence of flammable vapors. A flammable vapor sensor is inserted in the circuit supplying a solenoid actuated valve with power from a thermocouple. The sensor responds to the presence of a flammable vapor with an increase in resistance. When a critical concentration of flammable vapors is achieved, the voltage drop across the sensor causes the solenoid actuated valve to close.