De Dietrich 97955370 electrodes M42-5S

This article is an electrode from the ionization and ignition electrodes category. Such electrodes serve either to ignite the fuel-air mixture by delivering a spark from the ignition transformer, or to prove the flame by conducting a small rectified current through the flame. Both functions require the electrode to be positioned accurately in the flame zone. The electrode is a consumable item; its performance degrades over time due to exposure to high temperature and combustion residues. When selecting a replacement electrode of this type, the key parameters are the overall length, the bend angle, the insulator diameter, the spark gap, and the mounting flange configuration. These dimensions must match the original burner head design to ensure correct positioning. Common failure modes include erosion of the electrode tip, cracking of the ceramic insulator, soot deposits that cause tracking, and a gradual increase in spark gap that delays ignition. Regular inspection is recommended during burner servicing. In burners with a pilot burner, a separate electrode may be used for the pilot flame, which then provides the flame signal to hold the main gas valve open. For direct spark ignition systems, the same electrode often performs both ignition and flame sensing duties. When replacing, always check that the electrode matches the burner series it was shaped for, as a mismatch can lead to ignition failure or loss of flame signal.