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Related Subject Material Is Disclosed In Co-pending U.S. Williams Et Al., Filed Even Date Herewith, Entitled \"Dual Circuit Wall Change Occupancy Sensor And Method Of Operating Same\" (Ser.
Related subject material is disclosed in co-pending U.S. Williams et al., filed even date herewith, entitled \"Dual Circuit Wall Change Occupancy Sensor and Method of Operating Same\" (Ser. No 11/138,084); and http://www.drugoffice.gov.hk/gb/unigb/pastebin.com/u/ikks in co-pending U.S. R. Kurt Bender et al., filed even date herewith, entitled \"Occupancy Sensor Fascia Cowl Plate\" (Ser. No. 29/230,825); your entire contents of each of those purposes being expressly included herein by reference. The current invention relates to an occupancy sensor assembly. More particularly, the present invention relates to an improved occupancy sensor meeting which facilitates upkeep of the sensor meeting, enhances effectiveness of ultrasonic sensors, and minimizes harm to the assembly in excessive abuse purposes. An occupancy sensor is designed to detect the presence of an individual(s) in a room, often in order to determine whether varied electrically powered loads in that room (for instance, lights, ventilation, and the like) needs to be turned on or not. That is of specific benefit to establishments which have occupants who are circuitously responsible for paying for the electricity they eat, since these individuals usually do not exercise diligence in recurrently turning off electrically powered loads, such as lights, ventilation, and the like, after they depart a room. Occupancy sensors may therefore conserve a great deal of energy. This has led many businesses to buy them voluntarily; it has also resulted in laws in certain states mandating the use of occupancy sensors in massive areas as an environmental conservation measure. The two most prevalent sorts of occupancy sensors used with computerized wall switches, either singularly or together with one another, are passive infrared and active ultrasonic devices. Typically, a passive infrared (\"PIR\") sensor will turn on the load each time it detects a shifting or newly apparent heat supply. Passive infrared occupancy detection know-how allows steady detection of transferring objects that emit infrared energy. This method of occupancy detection can be fairly sensitive although it is based on passive sensing of shifting sources of infrared vitality. An energetic ultrasonic sensor emits vibrations at frequencies of 25 kHz or greater and listens to the return echoes; if it detects a big Doppler shift, indicating the presence of a shifting physique, then it turns the load on. Either detector will turn the load back off after a sure interval of no movement sensed, often three to sixty minutes as determined by the user. The motion sensitivity of the system is normally additionally set by the user. More specifically, energetic ultrasonic acoustic Doppler occupancy detection know-how permits continuous detection of shifting objects that mirror ultrasonic acoustic energy. For example, at the moment available mild switches or the like used in offices emit an ultrasonic wave right into a room and detect movement of individuals by sensing a Doppler-shift in the reflected ultrasonic wave. The Doppler-shift within the reflected wave is caused by individuals transferring throughout the room. This methodology of occupancy detection is highly delicate because it is based on an lively source of ultrasonic acoustic energy. An apparatus and method of this sort are disclosed in U.S. Pat. No. 5,640,143, to Myron et al (assigned to the same assignee as the current invention), all the disclosure of which is incorporated hereby by reference. Each of most of these sensors isn`t with out drawback. For example, PIR sensors require a lens. The lens has an uncovered entrance wall which permits transmission of infrared energy to detect occupancy. The entrance wall is typically organized in shut proximity to manual override switches. Consequently, in excessive-abuse functions reminiscent of schools and offices, the lens is constantly poked and prodded throughout attempts to activate the manual override swap. For instance, the lens is commonly damaged resulting from acts of vandalism. Thus, the structural integrity of the lens is commonly compromised and requires alternative. Ultrasonic sensors make the most of transducers to emit and obtain sonic energy. Usually, to minimize the size of the system, the transducers are mounted instantly onto the circuit board. The transducers are arranged perpendicular to the circuit board and outline an axis. The transducers send and obtain a sensitivity sample. The sensitivity pattern is strongest on the transducer axis. The sensitivity sample weakens away from the transducer axis. Due to this fact, the resultant composite sensitivity sample of the sender and receiver transducers is significantly greater along the transducer axis, however, considerably less to the sides. That is undesirable, for the reason that sensor sample should have uniform sensitivity to the sides of the transducer axis to successfully cover all the managed area. To protect the ultrasonic transducers, a grille is typically placed in entrance of the transducers. The grille is typically designed with openings to permit suitable passage of acoustic vitality via the grille. When servicing the connected lighting load, power needs to be disconnected from the load. Circuit interruption at the breaker is the preferable option to disconnect power; however, electricians often use a guide wall switch to disconnect power to a circuit. An computerized occupancy sensor wall switch could subsequently re-energize the load, thus, presenting a problem. Consequently regulatory bodies typically require a swap within the occupancy sensor to prohibit the sensor from energizing the load. This is commonly known as an \"air-gap\" switch, indicating that it`s composed of metal contacts separated by air. The air-gap change in an occupancy sensor is often hidden and requires disassembly of the switch cowl plate for access. After completing service on the lighting load, an electrician should close the air-hole change, but, typically this step is forgotten. Consequently, the switch cover plate is reassembled with the air hole swap left within the open place. This necessitates a return to the change and subsequent disassembly and reassembly of the cover plate to close the switch. Thus, worthwhile time is wasted. Accordingly, so as to handle these disadvantages, there have been numerous further makes an attempt to provide improved occupancy sensors. Examples of such occupancy sensors are disclosed in U.S. Pat. Nos. 6,798,341 to Eckel et al.; U.S. Pat. No. 6,587,049 to Thacker; U.S. Pat. No. 6,480,103 to McCarthy et al.; U.S. Pat. No. 6,222,191 to Myron et al.; U.S. Pat. No. 6,150,943 to Lehman et al.; U.S. Pat. No. 6,082,894 to Batko et al.; U.S. Pat. No. 6,049,281 to Osterweil; U.S. Pat. No. 5,973,594 to Baldwin; U.S. Pat. No. 5,861,806 to Vories et al.; U.S. Pat. No. 5,703,368 to Tomooka et al.; U.S. Pat. No. 5,394,035 to Elwell; U.S. Pat. No. 5,392,631 to Elwell; U.S. Pat. No. 5,363,688 to Elwell; U.S. Pat. No. 5,319,283 to Elwell; U.S. Pat. No. 5,293,097 to Elwell; U.S. Pat. No. 5,281,961 to Elwell; U.S. Pat. No. 5,142,199 to Elwell; U.S. Pat. No. 4,841,285 to Laut; U.S. Pat. No. 4,751,399 to Koehring et al.; U.S. Pat. No. 4,703,171 to Kahl; U.S. Pat. No. 4,678,985 to Moski; U.S. Pat. No. 4,418,337 to Bader; U.S. Pat. No. 4,057,794 to Grossfield; and U.S. Pat. No. 2,096,839 to Barlow. Though a number of the options of those occupancy sensor assemblies ease the disadvantages described above, a persevering with want exists for an improved occupancy sensor assembly which facilitates upkeep of the sensor meeting, enhances effectiveness of a ultrasonic sensor, and minimizes harm to the assembly in excessive abuse purposes. An object of the current invention is to resolve no less than the above problems and/or disadvantages and to provide a minimum of the advantages described beneath. Accordingly, an object of the current invention is to offer a fascia cover plate which enhances ultrasonic transmissions and reduces harm due to tampering or acts akin to vandalism. One other object of the current invention is to offer a lens with improved durability with out compromising performance. A further object of the present invention is to forestall a change of the assembly from being left within the disabled state after service or upkeep operations are carried out. The foregoing objects are attained by offering an occupancy sensor comprising a housing with an inside cavity; a swap configured for placement within the open and closed positions, and the swap being mounted considerably within the interior cavity of the housing; and a fascia cover plate configured for positioning on the housing to enclose the inside cavity, the fascia having a fascia rib on an interior surface, the fascia rib being organized to interfere with the swap within the open state to forestall positioning of the fascia cowl plate on the housing when the change is within the disabled state. The foregoing objects are also attained by providing an occupancy sensor to detect occupancy of a controlled area, comprising not less than one ultrasonic transducer; and a fascia cover plate for covering the at least one transducer, the fascia cover plate having grillwork organized to allow transmission of ultrasonic vitality between the no less than one ultrasonic transducer and the controlled area; whereby the not less than one ultrasonic transducer is positioned in shut proximity to the grillwork to boost the effectiveness of a wave sample of the ultrasonic energy. Moreover, the grillwork is ideally shaped to direct the power laterally from the transducer axis. The foregoing objects are additional attained by providing an occupancy sensor comprising a passive infrared sensor having a mounting plate with a window to permit infrared energy to move through onto the infrared sensor, the mounting plate having a raised guide; and a lens with a front wall and four facet walls configured for positioning over the raised guide. Different objects, advantages, and salient features of the invention will grow to be apparent to these expert within the art from the next detailed description, which, taken at the side of the annexed drawings, discloses most popular embodiments of the invention. FIG. Three is a bottom elevational view in partial cross-part of the occupancy sensor shown in FIGS. FIG. 4 is a bottom elevational view in partial cross-part of the occupancy sensor proven in FIGS. FIG. 6 is a front elevational view of the occupancy sensor proven in FIGS. FIG. 8 is a side elevational view taken in partial cross-section alongside line B-B of the occupancy sensor shown in FIGS. 6-7 displaying an ultrasonic transducer in close proximity to the fascia grillwork. All through the drawings, the identical drawing reference numerals can be understood to refer to the identical parts, options, and buildings. The issues outlined in the outline such as a detailed construction and components are offered to help in a complete understanding of the embodiments of the invention. Accordingly, these of extraordinary ability within the artwork will recognize that numerous changes and modifications of the embodiments described herein could be made with out departing from the scope and spirit of the invention. Additionally, descriptions of well-recognized features and constructions are omitted for readability and conciseness. FIGS. 1-2 illustrate an occupancy sensor meeting 10 in accordance with an embodiment of the present invention. The housing 12 comprises an interior cavity 14 outlined by a top wall, a bottom wall, a back wall, and two aspect walls. Various help construction similar to mounting ribs are situated inside the inside cavity 14 to support the meeting components. Within the exemplary embodiment, two flanges 16a and 16b extend from the highest and bottom walls along a plane parallel to the back wall. In different words, every flange laterally extends from the facet partitions. Every flange 16a and 16b has an aperture therein for receiving a standard fastener reminiscent of a screw to mount the housing 12 on a help surface. Preferably, the housing 12 is mounted on a support surface such as the wall of a constructing. The housing 12 is ideally considerably rectangular; however, any suitable polygonal form could also be used. As finest seen in FIG. 2, the occupancy sensor meeting 10 has a sensor module 18 comprising a power board 20 and a sensor board 22. The power board 20 implements the power supply, and lighting load switching circuitry. The sensor board 22 and energy board 20 are connected by way of a header (not proven). Amongst numerous other circuitry parts, occupancy sensors are mounted on a prime surface of the sensor board 22 as is usually known in the artwork. The occupancy sensors may be any parameter sensor recognized in the art, reminiscent of passive infrared (PIR) sensor, a ultrasonic sensor, temperature sensor, mild sensor, relative humidity sensor, a sensor for the detection of carbon dioxide or other gases, an audio sensor, or every other passive or energetic sensor that can be utilized to detect movement or change from the nominal setting. Within the exemplary embodiment, a dual occupancy sensor is used incorporating a PIR sensor 24 and two ultrasonic sensors 26 and 28; however, it ought to be understood that different appropriate preparations and constructions could also be used. The PIR sensor 24 is centrally positioned. Every of the ultrasonic sensors 26 and 28 is positioned above the PIR sensor 24 proximate to a top edge of the sensor board 22. As proven in FIGS. 6-8, the two ultrasonic sensors 26 and 28 are disposed adjacent to one another. Turning again to FIG. 2, the sensor board 22 also has a switch 31 positioned on a prime floor. The change 31 is used to prevent the relay contacts on the unit from being closed. Thus, when the change 31 is in the disabled or open place, the occupancy sensor meeting 10 is in a disabled state. So, when adjustment or maintenance on a managed load is required, the fascia cowl plate 56 is eliminated. Then, the switch 31 is moved to the disabled position and the entrance push button switches are pressed to disable electric power to the load. Consequently, the technician is protected from harm such as electrical shock when servicing the controlled load. The facility board 20 and sensor board 22 are ideally substantially rectangular; nonetheless, any appropriate form may be used. FIG. 2 additionally illustrates a mounting plate 30. The mounting plate 30 has top and bottom surfaces. Depending upon the depth of the partitions 36 and 38, the ultrasonic sensors 26 and 28 are positioned via the apertures 32 and 34 and at a predetermined distance from the fascia cowl plate 56. By various the location and depth of the ultrasonic sensors 26 and 28, the ultrasonic sensors 26 and 28 capacity to transmit sonic power may be positively affected. A raised guide forty is centrally disposed on the mounting plate 30. The raised information 40 has 4 walls with inside and outer surfaces. The inside surfaces taper inward and define an infrared energy window 42. The window 42 receives power by means of which the PIR sensor 24 can view the ambient setting by way of the lens 44. Due to this fact, the raised guide 40 advantageously positions the lens 44 relative to the PIR sensor 24 in order that the focal level of the lens 44 is optimized for the PIR sensor 24 at the desired wavelengths. The lower finish of the mounting plate 30 features a slot 52. Preferably, the slot 52 is substantially rectangular. The slot fifty two extends by way of the highest and bottom surfaces of the mounting plate 30 to obtain the switch 31. The mounting plate 30 is preferably substantially rectangular; nevertheless, any suitable form may be used. Aside from the configuration described above, the mounting plate 30 and its connection to the sensor module 18 is generally identified in the art. Lens 44 is positioned in front of and in the sphere of view of the PIR sensor 24. The lens 44 focuses infrared radiation. When the PIR sensor 24 is used, the lens forty four is ideally a fresnel lens; however, the lens forty four may differ with the various kinds of sensors. The lens forty four is molded in a 5-wall box construction. The entrance wall 54 contains the optics. The front wall 54 is substantially curved to increase the rigidity and mechanical stiffness of the lens 44. The curvature additionally increases the world of the lens for optical achieve. 4 of the sides are structural partitions. The structural partitions are substantially vertical and extend to the bottom floor of the substantially curved entrance wall 54. The five-wall field construction acts to slidably have interaction the outer surfaces of the vertical partitions of the raised information 40 and type a cover over the infrared energy window 42. As stated above, the raised information 40 is advantageously shaped to carry the lens 44 and to stop the lens 44 from deforming below strain exerted from exterior forces. Extending perpendicularly from at the very least one of many structural walls is the projection 50 having an aperture. The protrusions forty eight of the mounting plate 30 are inserted into the aperture. A fascia cover plate fifty six is shown in FIG. 2. The fascia cowl plate fifty six is removable and supplies an interface between the ultrasonic transducers 26 and 28 and the ambient air in the controlled space. Openings in an upper portion of the fascia cowl plate form a ported grillwork construction 58. The ported grillwork 58 facilitates air circulate and the transmission of sonic vitality. The ported grillwork fifty eight has a predetermined size, depth, and shape. For instance, a conventional occupancy sensor meeting 60 is illustrated in FIG. 5. First, within the standard occupancy sensor meeting 60, ultrasonic transducers 62 and 64 are mounted perpendicularly to the circuit board 22. Annular rings 72 and 74 prolong beyond a entrance floor of the ultrasonic transducers sixty two and 64. Subsequent, the depth of the person ported grills 76 is relatively shallow, thus, leaving a relatively large hole 78 between the ultrasonic transducers sixty two and sixty four front floor and the grillwork 76. This arrangement permits the ultrasonic energy to proceed within the course it`s emitted from the ultrasonic transducers 62 and 64, that is to say, considerably ahead and never laterally. As best seen in FIGS. 6-8, the ultrasonic transducers 26 and 28 are each arranged above the lens forty four and substantially parallel to one another. The fascia cowl plate fifty six also includes a lens aperture 78 for receiving the PIR lens 24 and transmitting infrared energy therethrough. The lens aperture 78 is preferably centrally located and considerably rectangular in form. The lens forty four preferable makes use of a clearance match for positioning into the aperture 78; nevertheless, any appropriate preparations and constructions may be used. The lower portion of the fascia cover plate fifty six preferably includes two manual override switches eighty and 82 to override the routinely chosen state of the managed output circuits. All manual control of circuits is reset to defaults after occupancy expires. The rationale there are two override switches eighty and eighty two is that some state and local vitality conservation/building codes require installation of two gentle switches in the development or reconstruction of offices, every to control a special portion of the overhead lighting. The reasoning behind such a requirement is that, within the interest of energy conservation, workers and janitorial personnel have the opportunity to use roughly one half of the light they might normally require of their day-to-day activities. Relying upon the amount of ambient light obtainable, workers working in a room may choose to use only one half of the accessible bank or banks of lights. As best seen in FIGS. 3-4, the fascia cowl plate 56 has an interior floor. A fascia rib 84 extends outwardly from one facet of the interior surface to forestall a technician from leaving the switch 32 within the open place. As talked about above, the swap 32 is used to prevent the relays from closing contacts. Thus, when the change 32 is moved to the disabled place, the occupancy sensor assembly 10 is in a disabled state (FIG. 4). So, when adjustment or upkeep on the load is required, the fascia cover plate 56 is removed. Then, the change 32 is moved to the disabled place to disable electric power from the load to guard the technician from damage akin to electrical shock. When the technician completes service or maintenance, the technician should enable close the change 32 to reconnect power (FIG. 4). Nevertheless, often a technician will neglect to do so. As a result, the occupancy sensor meeting 10 is reassembled with out reconnecting energy. In order to stop this from taking place, the fascia rib eighty four interferes with the swap 32 when in the disabled place. Subsequently, the technician can`t reassemble the occupancy sensor meeting 10, whereas the swap 32 is within the disabled place. The fascia cover plate fifty six is preferably substantially rectangular; however, any appropriate shape could also be used.
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