De Dietrich Ionisation sensor 83457007

The De Dietrich 83457007 is an ionisation sensor, categorized under ionization & ignition electrodes. It is designed to prove the presence of a flame during the burner safety sequence by conducting a small rectified current through the flame. If the signal is lost, the burner control locks out within the safety time. This sensor is resistant to soot and is installed in De Dietrich DTG 350 Nez/Diematic boilers. It proves the main flame indirectly, typically via a pilot flame.

When selecting an ionisation electrode of this type, critical parameters include the overall length and bend of the rod, insulator diameter, gap between electrode tip and burner earth, and mounting flange type. The exact shape must match the burner design and flame position. For burners with a pilot burner, the electrode is positioned so the pilot flame provides the signal. Ensure the replacement matches original dimensions and mounting arrangement to avoid shorting or unreliable detection.

Ionisation electrodes are consumable items. Over time, the tip erodes, the ceramic insulator may crack from thermal shock, and soot deposits can insulate the electrode, weakening the flame signal. These failures typically result in nuisance lockouts or delayed ignition. Check for erosion, cracks, and soot buildup on the electrode.