De Dietrich S101764 Ignition/ionization electrode

This is a combined ignition and ionization electrode from De Dietrich, listed under manufacturer code S101764 and catalogue article 336.946.066. It sits in the category of ionization and ignition electrodes. Parts of this type serve two roles in the burner: the ignition electrode receives high voltage from the ignition transformer to produce a spark, while the ionisation electrode proves the flame by conducting a small rectified current through it once combustion is established. Both functions are frequently combined in a single electrode assembly, with the tip positioned directly in the flame zone. Such electrodes are consumable items and are selected by their physical geometry: overall length, bend angle, insulator diameter, spark gap, and the shape of the mounting flange. They are designed for a specific burner series, so the profile and the position of the tip relative to the burner head must match the original part. Typical failure modes include an eroded tip that widens the spark gap and delays ignition, a cracked ceramic insulator that causes flashover, sooting that shorts the signal, or mechanical damage during servicing. When replacing, check that the ceramic is intact, the gap is set to the burner manufacturer’s specification, and the mounting orientation matches the flame path. Where a pilot burner is used, the electrode may be fitted inside the pilot assembly. The pilot carries a small permanent or intermittent flame that lights the main burner and maintains the ionization signal. In such systems, the electrode must be long enough to reach into the pilot flame zone. Always compare the new electrode side by side with the removed part to confirm the bend and insulator length are identical.