How much current does a typical flame sensor conduct?

The typical current that a flame sensor conducts is in the range of 1-10 microamps. Flame sensors are designed to detect the presence of a flame through the ionization of the combustion gases; this process generates a small amount of current that the sensor can measure.

When the flame is present, the ionized gases allow for a flow of current, which the flame detection system interprets as a signal that combustion is taking place. The current range of 1-10 microamps is standard for most gas ignition systems, ensuring reliable operation while also being sensitive enough to detect even small changes in the flame condition.

Understanding the correct range is essential for technicians as it helps in diagnosing issues with flame sensors. If the current falls below this range, it could indicate a malfunctioning sensor, improper grounding, or issues with the ignition process.