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Ionisation meter

Ionisation meter
Modern central heating boilers have no pilot light but electronic ignition. Checking whether ignition has taken place can be carried out by measuring the ionisation current caused by the flame. When the ionisation current is too low, protection circuits come into action. The ignition circutt then tries to tgrute the burner again. If after a few attempts the burner still does not come on, an error signal is given.
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