| 摘要 |
A fail safe controller for a fuel burner has a rectifying probe positioned in the region occupied by the flame when it is burning normally. An alternating current power supply coupled to the probe is periodically interrupted by an inhibit circuit when the flame is burning. The intermittent rectified output from the probe controls the fuel supply by way of a diode pump circuit which ensures fail safe operation as it gives a null output for a steady state input.
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