Patent ID: 6772845
Filing Date: 2004-08-10
Classification: G08B

Abstract:
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.