How far should the tip of a thermocouple be placed in the pilot flame?

The recommended placement of a thermocouple's tip within the pilot flame is essential for accurate temperature measurement and ensuring that the thermocouple can effectively sense the flame's heat. For optimal functionality, the tip should generally be positioned between 3/8" to 1/2" into the pilot flame. This range ensures that the thermocouple is adequately immersed in the flame, allowing it to achieve a stable and accurate reading of the flame temperature.

Being placed too close to the edge might result in readings that are not representative of the optimal combustion conditions, while positioning it too deeply into the flame can lead to potential damage or inaccurate measurements due to excessive temperatures. Therefore, the specified range offers a balance that enhances measurement accuracy and equipment safety.