Detector arrangement for detection of fire risk in a process plant
First Claim
1. A detector arrangement adjustable for inclusion in a preventive protective system for a process plant comprising at least two sensor units each for producing an ouput signal;
- an evaluating unit for each sensor unit for evaluating the output signal of each sensor unit; and
an activating unit cooperating with the evaluating units, said activating unit being responsive to the output signals from the evaluating units for switching from a first position to a second position, characterized in that one or more sensor units falling within a first category is designed, via its circuit for evaluating output signals, to be able to determine the energy content of a particle present, in that one or more sensor units falling within a second category is designed, via its circuit for evaluating output signals, to be able to determine the fire tendency or tendency to some other damage of the particle surroundings, and in that the activating unit is designed to pass from a first position to a second position only when the combined energy content and the tendency determined indicate high risk of fire or other damage.
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Accused Products
Abstract
The invention comprises a detector arrangement adjustable for inclusion in a preventive protective system for a process plant comprising at least two sensor units (10, 10′), a unit (16a, 16b) for evaluating the output signal of each sensor unit and a calculation unit (17) capable of co-operating with the evaluating units (16a, 16b), the output signals of which calculation unit can cause an activating unit (18) to pass from a first position to a second position. One or more of a first category of sensor units (10) is designed, via its circuit (16a) for evaluating output signals, to be able to determine the energy content of a particle present. One or more of a second category of sensor units (10′) is designed, via its circuit (16b) for evaluating output signals, to be able to determine the fire tendency or tendency to some other damage of the particle surroundings. The activating unit (18) is designed to pass from a first position to a second position only when the combined energy content and the tendency determined in said calculation circuit (17) indicate high risk of fire or other damage.
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Citations
12 Claims
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1. A detector arrangement adjustable for inclusion in a preventive protective system for a process plant comprising at least two sensor units each for producing an ouput signal;
- an evaluating unit for each sensor unit for evaluating the output signal of each sensor unit; and
an activating unit cooperating with the evaluating units, said activating unit being responsive to the output signals from the evaluating units for switching from a first position to a second position, characterized in that one or more sensor units falling within a first category is designed, via its circuit for evaluating output signals, to be able to determine the energy content of a particle present, in that one or more sensor units falling within a second category is designed, via its circuit for evaluating output signals, to be able to determine the fire tendency or tendency to some other damage of the particle surroundings, and in that the activating unit is designed to pass from a first position to a second position only when the combined energy content and the tendency determined indicate high risk of fire or other damage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- an evaluating unit for each sensor unit for evaluating the output signal of each sensor unit; and
Specification
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- Resources
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Current AssigneeFirefly AB
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Original AssigneeFirefly AB
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InventorsJansson, Lennart Karl Erik
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Primary Examiner(s)Mar, Michael
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Assistant Examiner(s)Bui, Thach H
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Application NumberUS09/979,035Time in Patent Office984 DaysField of Search169/54, 169/60, 169/61, 340/521, 340/522, 340/584US Class Current169/54CPC Class CodesG08B 17/00 Fire alarms; Alarms respons...G08B 17/12 Actuation by presence of ra...G08B 29/188 Data fusion; cooperative sy...
