De Dietrich Ionisation probe 97955318

The De Dietrich Ionisation probe 97955318 (type designation D54) is a flame-proving electrode for gas-fired burners. It is installed in De Dietrich G 300 N boilers. The probe sits inside the flame zone and conducts a small rectified current through the flame, which the burner control reads as proof of flame. It is resistant to soot. This probe does not create a spark; it only senses flame.

When replacing an ionisation probe of this kind, critical selection parameters include length, bend angle, ceramic diameter, gap distance, and mounting flange design, all of which must match the burner head geometry. The electrode is normally shaped for a specific burner series; using a generic substitute may alter the gap or position and cause nuisance lockouts. Before ordering, compare these dimensions with the original part.

Ionisation probes are consumable items. The tip erodes from continuous exposure to the flame, the ceramic insulator can crack from thermal shock, and soot deposits can interrupt the rectified signal. A drifting electrode gap, often caused by material fatigue or incorrect adjustment, may also prevent flame detection. If the probe is damaged or its position has shifted, the burner control will not receive a signal, and the burner will fail to ignite or will lock out after the safety time.