Apparatus for monitoring a smoke detector
First Claim
1. An apparatus for monitoring the function of a smoke detector in an aircraft, said apparatus comprising a smoke detector, an air flow passage to an air or smoke inlet of said smoke detector, at least two air pressure sensors positioned in such locations relative to said air flow passage that an air pressure differential is detectable in said air flow passage to said smoke detector, a pressure information evaluating unit operatively connected to said at least two air pressure sensors for processing said pressure information to detect an air pressure differential which signifies that a clogging in said air flow passage to said smoke detector prevents said smoke detector from functioning properly, and an indicator for receiving a control signal from said information evaluating unit for indicating that said smoke detector is prevented from functioning properly.
2 Assignments
0 Petitions
Accused Products
Abstract
The proper function of a smoke detector of an enclosed space, such as a toilet or freight space or crew quarters in an aircraft, is monitored by at least two air pressure sensors which are so positioned that these air pressure sensors can measure an air pressure differential in the air flow into the smoke detector. If a pressure differential is detected the differential is evaluated in a central processing unit which produces a respective signal that indicates that the air flow and thus the smoke flow into the smoke detector is obstructed, whereby the smoke detector cannot function properly. This signal is visibly or audibly indicated.
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Citations
15 Claims
- 1. An apparatus for monitoring the function of a smoke detector in an aircraft, said apparatus comprising a smoke detector, an air flow passage to an air or smoke inlet of said smoke detector, at least two air pressure sensors positioned in such locations relative to said air flow passage that an air pressure differential is detectable in said air flow passage to said smoke detector, a pressure information evaluating unit operatively connected to said at least two air pressure sensors for processing said pressure information to detect an air pressure differential which signifies that a clogging in said air flow passage to said smoke detector prevents said smoke detector from functioning properly, and an indicator for receiving a control signal from said information evaluating unit for indicating that said smoke detector is prevented from functioning properly.
- 13. An apparatus for monitoring the function of a smoke detector, said apparatus comprising a smoke inlet for said smoke detector, at least one first air pressure sensor arranged downstream of said smoke inlet, at least one second air pressure sensor arranged upstream of said smoke inlet, as viewed in an air flow direction toward said smoke detector, for detecting an air pressure differential across said smoke inlet of said smoke detector, a pressure information evaluating unit operatively connected to said first and second air pressure sensors for processing a pressure differential information into a control signal signifying a clogging of said smoke inlet of said smoke detector, and an indicator for receiving said control signal for indicating that a smoke detector function is impaired or prevented.
Specification