The ignition electrodes can be used as ionisation probes and vice-versa. But it is always necessary to respected their location, i.e. the ignition electrode must be outside the flame, and only the central electrode of the ionisation probe must be in the flame. The ignition electrodes and ionisation probes are made from high quality materials. The insulator is made of OXAL ceramics with a high content of Al2O3. The characteristic feature of this ceramic material is high mechanical strength and resistance to thermal and electrical stress (electrical insulator strength is 18 kV). The centre electrode is made of special refractory material – Kanthal, which is resistant to high temperature and electrochemical corrosion.

IONISATION PROBES

are used as combustion sensors in gas devices. The centre electrode is permanently in the flame. The rest of the parts of the probe must be positioned in the burner space in such a way that they are not subjected to natural cooling.