Indicator panels incorporating liquid crystal devices (LCD)

85.31 Electric sound or visual signalling apparatus (for example, bells, sirens, indicator panels, burglar or fire alarms), other than those of heading 85.12 or 85.30. 8531.10 - Burglar or f i e alarms and similar apparatus 853 1.20 - Indicator panels incorporating liquid crystal devices (LCD) or light emitting diodes (LED) 853 1-80 - Other apparatus 853 1.90 - Parts With the exception of signalling apparatus used on c cles or motor vehicles (heading 85.12) and that for traffic control on roads, railways, etc. &eadiog 8530), this heading covers all electrical a aratus used for signalling urposes, whether uslng sound for the transmission of the signal ftells, buzzers, hooters, etc.f or using visual indication (lamps, flaps, illuminated numbers, etc.), and whether operated by hand (erg., door bells) or automatically (e.g., burglar alarms). Static signs, even if lit electrically (e.g., lamps, lanterns, illuminated panels, etc.) are not re arded as signalling a paratus. They are therefore not covered by this heading but are classified in keir own appropriate geadmgs (headings 83.10,94.05, etc.). The heading includes, inter alia : (A) Electric bells, buzzers, door chimes, etc. The bells consist essentially of an electro-magnetically operated ap liance which causes a small h m e r to vibrate and strike a bell dome. Buzzers are similar ut without the bell dome. Both are used very extensively for domestic p oses (e.g., as door bells), and in offices, hotels, etc. The heading. also covers electric oor chimes in which one or more metal tubes are struck, emitting a musical note or series of musical notes, and electrically operated church bells, other than carillons suitable for playing music (Chapter 92). \ ? Electric bells and door chimes are usually designed to be operated fiom a low tension supply (primary cell or battery), but in certain cases they incorporate a transformer to step down the mains voltage. (B) Electric sound signalling apparatus, horns, sirens, etc. The sound is produced by a vibratin reed, by a rotatmg disc set in motion electrically or electronic sound generator; they inc ude factory sirens, air raid sirens, ships' sirens, etc. f (C) Other electrical signalling a paratus (winking or intermittent lights, etc.) for aircraft, ships, trains or other vehicles &her than for cycles or motor vehicles heading 85.121, but not radio or radar apparatus of heading 85.26. (D) Indicator panels and the like. These are used (e.g., in offices, hotels and factories) for calling personnel, indicating where a certain person or service is required, indicating whether a room is free or not. They include : (1) Room indicators. These are lar e panels with numbers corresponding to a number of room. When a button is presse in the room concerned the corresponding number is either lit up or exposed by the falling away of a shutter or flap. (2) Number indicators. The signals a ear as illuminated figures on the face of a small box; in some apparatus of this kinage calling mechanism is operated by the dial of a telephone. Also clock type indicators in which the numbers are indicated by a hand moving round a dial. (3) Office indicators, for example, those used to indicate whether the occupant of a garticular office is fiee or not. Some types are merely a sunple " come m " or engaged " sign illuminated at will by the occupant of the office. (4) Lift indicators. These indicate, on an illuminated board, where the lift is and whether it is going up or down. (5) Engine room telegraph apparatus for ships. (6) Station indicating panels for showing the times and platforms of trains. (7) Indicators for race courses, football stadiums, bowling alleys, etc. Certain of these indicator panels, etc., also incorporate bells or other sound signalling devices. The heading does not cover public maps of roads or railways in which a particu!ar place, road, section or route is illuminated on pressing an appropriate button, nor electric advertising signs. (E) Burglar alarms. These consist of two parts : a detecting part, and a signalling part (bell, buzzer, visual indicator, etc.) which xs set off automatically when the detecting part operates. Burglar alarms operate by various means, e.g. : (1) By electrical contacts which are operated by stepping on a certain part of the floor, opening a door, breaking or touching fine wires, etc. (2) By ca acitance effects. These are used often in connection with safes; the safe acts as one p ate of a capacitor whose capacitance is affected by the approach of any body, thus upsetting the electrical circuit and setting off the alarm. ?' (3) Photoelectric devices. A ray (often of infia-red light) is focussed on a photoelectric cell; when the ray is interrupted, the change in current in the photoelectric cell circuit sets off the alarm. (F) Fire alarms. Automatic alarms also consist of two arts : a detecting part, and a signalling part (bell, buzzer, visual indicator, etc.). They inclu ! 4 e: (1) Apparatus operated by a fusible product (wax or special alloy) which melts when the temperature rises above a certain point, thus allowing electrical contacts to close and set off the alarm. - F (2) Apparatus based on the expansion of a bi-metal stri ,liquid or gas ex ansion beyond a certain point operat~ngthe alarm. In one type, tfe expansion of a gas orces a piston to move in a cylinder; a valve is incorporated so that a slow expansion does not set off the alarm, but only a sudden expansion due to a sudden rise in temperature. (3) A paratus based on the variation in the electrical resistance of an element su jected to a change in temperature. ! (4) Apparatus based on photoelectric cells. A ray of light is focussed on the cell and, if obscured to a predetermined extent by smoke, operates the alarm. Similar apparatus fitted with a graduated indicator or a recordmg system fall in Chapter 90. In addition to the automatic fire alarms, the heading also covers non-automatic alarms, such as are mounted in streets, for calling the fire brigade. (G) Electric vapour or gas alarms, consisting of a detec.tor and a sound or visual alarm, to warn of the presence of hazardous gaseous mixtures (e.g., natural gas, methane). (H) Flame alarms (flame detectors) incorporating a photoelectric cell which operates the alarm through a relay when the flame li ts or goes out. Detectors not incorporating electric sound or visual alarm devices are c assified m heading 85.36. P PARTS Sub'ect to the general provisions regarding the classification of parts see the General Exp anatory Note to Section XVI), parts of the goods of this heading are also c assified here. \ The heading also excludes : (a) Switches and switch-panels, vc-hether or not incorporating simple indicating lights (heading 85.36 or 85.37). (b) Fire alarms incorporating smoke detectors containing a radioactive substance (heading 90.22). (c) LCD monitors or television receivers (heading 85.28).