Where should the flame sensor be positioned within the flame?

The flame sensor should be positioned in the outer cone of the flame, which is considered the cleanest part of the flame. This area provides an optimal environment for the sensor to detect the presence of flame accurately without being influenced by the extreme heat present in the inner cone. The outer cone is cooler and less turbulent, which aids the sensor in consistently detecting the flame without the risk of false readings that can occur in hotter, more chaotic regions.

Positioning the sensor here enhances its ability to function effectively and prolongs its lifespan by reducing exposure to excessive heat and potential damage. This careful placement is essential in gas appliances where safe and reliable flame detection is crucial for preventing malfunctions and ensuring user safety.