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BEAM1224S Datasheet(PDF) 3 Page - Systemsensor advanced ideas. |
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BEAM1224S Datasheet(HTML) 3 Page - Systemsensor advanced ideas. |
3 / 13 page Projected beam detectors are usually located with their beams parallel to the ceiling. However, they can be mounted vertically or at any angle to protect the area involved. Since beam detectors sense the smoke buildup over a distance, they are ideal for locations with high ceilings. They can also be mounted on a wall or ceiling below the level of a spot type detector, reducing the effects of air stratification. Some typical locations would include large areas with high ceilings such as atriums, warehouses, and factories. NOTE: Projected beam smoke detectors should always be mounted to stable mounting surfaces. See the MOUNTING LOCATION section for details. Some fire codes specify spacing on a given center-to-center distance between detectors under ideal conditions. This spacing is based on rooms with smooth ceilings and no physical obstructions between the contents being protected and the detectors. Moreover, they are also based on a maximum ceiling height, and on the assumption that the value and the combustible nature of the contents of the room being protected do not warrant greater protection or closer spacing. In a room with a smooth ceiling, detectors should be spaced between 30 and 60 feet (9.1 to 18.3m). One-half that spacing between the beam and the side- wall may be used as a guide. See Figure 1. The beam detector can be mounted with the transmitter/receiver on one wall and the reflector on the opposite wall, or both suspended from the ceiling, or any wall/ceiling combination. In the case of the ceiling mount, the distance from the end walls should not exceed one-quarter of the selected spacing (7.5 ft. [2.3m] maximum if the spacing is 30 ft. [9.1m]). See Figure 2. fIgURE 1. SPACINg fOR SMOOTh CEILINg (SIDE vIEw): 1 /2 S S 12 - 18 IN. (0.3 - 0.46M) WALL C0254-00 fIgURE 2. SPACINg fOR SMOOTh CEILINg (TOP vIEw): 16 FT. (5M) MINIMUM 328 FT. (100M) MAXIMUM Tx/Rx REFLECTOR S Tx/Rx REFLECTOR 1 /2 S MAXIMUM 1 /4 S MAX. C0255-00 In the case of peaked or sloped ceilings, codes may specify spacing of detectors by using horizontal spacing from the peak of the roof or ceiling. Figures 3 and 4 show the spacing for both the shed type and peaked type sloped ceilings. On smooth ceilings, beam smoke detectors should generally be mounted be- tween 12 and 18 inches (0.3 to 0.46m) from the ceiling. In many cases, how- ever, the location and sensitivity of the detectors shall be the result of an engineering evaluation that includes the following: structural features, size and shape of the room and bays, occupancy and uses of the area, ceiling height, ceiling shape, surface and obstructions, ventilation, ambient environ- ment, burning characteristics of the combustible materials present, and the configuration of the contents in the area to be protected. fIgURE 3. SLOPED CEILINg (ShED TyPE): S 3 FT. (0.9M)MAX. S 1/2 S MAX. Tx/Rx REFLECTOR C0256-00 fIgURE 4. SLOPED CEILINg (PEAkED TyPE): 1/2 S S S 1/2 S 3 FT. (0.9M) MAX. 3 FT. (0.9 M) MAX. MOUNT DETECTOR ANYWHERE IN THIS AREA Tx/Rx REFLECTOR C0257-00 MOUNTINg LOCATIONS Beam detectors require a stable mounting surface for proper operation. A sur- face that moves, shifts, vibrates, or warps over time will cause false alarm or trouble conditions. Initial selection of a proper mounting surface will elimi- nate false alarms and nuisance trouble signals. Mount the detector on a stable mounting surface, such as brick, concrete, a sturdy load-bearing wall, support column, structural beam, or other sur- face that is not expected to experience vibration or movement over time. DO NOT MOUNT the beam detector on corrugated metal walls, sheet metal walls, external building sheathing, external siding, suspended ceilings, steel web trusses, rafters, nonstructural beam, joists, or other such surfaces. In cases where only one stable mounting surface as defined above can be used, the transmitter/receiver unit should be mounted to the stable surface and the reflector should be mounted to the less stable surface. The reflector has a much greater tolerance for the unstable mounting locations defined above. MOUNTINg INSTRUCTIONS The transmitter/receiver unit may be mounted over a recessed junction box. The cavity behind the detector is then used for routing of the wiring from the junction box to the terminal blocks on the detector. The transmitter/receiver unit should be mounted to the wall such that unit covers the recessed junc- tion box in the wall completely. If the junction box is not recessed then you D400-73-00 3 I56-2294-004R |
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