How far must the tip of a flame igniter/sensor be placed from the main burner or pilot flame?

The correct distance for placing the tip of a flame igniter or sensor from the main burner or pilot flame is essential for ensuring that the flame sensor accurately detects the presence of a flame. If the sensor is positioned too far away, it may not reliably sense the flame, leading to safety issues and operational inefficiencies.

A distance of 8" to ½" is specified to allow for optimal detection while ensuring that the sensor remains sensitive to the flame's presence, without being adversely affected by the heat or flames. This configuration helps in maintaining the right balance for flame stability and safety functionality.

In contrast, other options either suggest distances that are too short or too far, which could compromise the effectiveness of the sensor or igniter. For example, a 1" to 2" distance could be too close, risking damage to the sensor, while 3" to 4" or 5" to 6" might place it beyond the effective range for reliable flame detection.