Fire and smoke sensing system
At least two sensors are used, providing electrical output signals to indicate alarm conditions, one of the sensors being a bipolar ion sensor having a shielded ion chamber formed to slow or brake atmospheric currents therethrough, and a second sensor which operates essentially in unipolar mode havi...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | At least two sensors are used, providing electrical output signals to indicate alarm conditions, one of the sensors being a bipolar ion sensor having a shielded ion chamber formed to slow or brake atmospheric currents therethrough, and a second sensor which operates essentially in unipolar mode having an ion chamber freely accessible to atmospheric flow therethrough. |
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