| 摘要 |
PCT No. PCT/SE94/00908 Sec. 371 Date Apr. 4, 1996 Sec. 102(e) Date Apr. 4, 1996 PCT Filed Oct. 3, 1994 PCT Pub. No. WO95/10330 PCT Pub. Date Apr. 20, 1995A detector arrangement is included in a preventive safety system that can be used within a process in which loosely formed process material is produced in a first unit (1) and transported (3) to a receiving, second unit (2), wherein the treatment to which the material is subjected in said first unit is liable to produce one or more discrete particles which have a temperature sufficiently high to initiate fire and/or explosion within at least the second part or unit (2). The necessary transportation of the loose material between the first unit (1) and the second unit (2) is effected along a path which includes a stabilizing zone (7), a high temperature particle indicating zone (8), and an extinguishing zone (9), wherein the indicating zone includes one or more particle sensors (10). The sensors coact with an indicating and activating unit (12) such that indication by the sensors of the presence of a high-temperature particle in said indicating and activating unit will activate a device which is associated with the extinguishing zone and which functions to deliver an extinguishing agent and/or to remove particles (15). The sensing lobes of two sensor units (105, 107) cover a cross section of the transportation path. The indicating and activating unit (12) is adapted to evaluate the sensed intensity from each of said sensor units (105, 107) and to coordinate received intensity-dependent signals so as to calculate and establish on the basis thereof the liability of the particle to initiate fire and/or explosion. |
