eHoefler wrote:
When you turn the oven on and to a temperature, the pilot flame increases, then it will warm up the thermocouple, when the thermocouple comes up to temp, it will open the main gas valve to the burner. The time it will take depends on temperature the thermocouple starts at and altitude you are at. The thermocouple is a non electric device that is filled with freon, when heated it will build pressure and press on a button in the main gas valve.
A thermocouple is an electrical device. What you have described is a vapor bulb.