Automation Parts

STANDARDS AS 1668, AS 1359, BS 7349, BS 4999, BS 5000, IEC 34, IEC 72. GENERAL Western Electric Smoke Spill motors are designed to meet the requirements of Bitish and Australian Standards. AS 1668. 1 states that the objectives of Smoke Control are:         a) to vent smoke from the fir-affected compartment: and         b) to reduce the spread of smoke to fire isolated exits and other compartments.   In general Smoke Spimm motors are required to continue to operate driving extraction fans in a building, in the case of a fire. Usually these motors operate air circulation fans as part of the normal operation of the building, however if a fire occurs they must continue to operate for a period of time to extract smoke and\or dangerous fumes from the building and allow rescue services some assistance in rescuing any occupants still in the building. it is expected that hte fumes ...

The following tables and comments are an attempt to cross reference between different National standards for Hazardous Location Definitions. We note that there is a world wide trend towards IEC standards in the electrical industry and that even the American manufacturers are gearing up to produce products to IEC standards in IEC metric dimensions. COMPARISON OF ZONES FOR ELECTRICAL EQUIPMENT IEC/CENELEC/U.K. GERMANY/JAPAN U.S.A. ZONE 0 DIVISION 1 ZONE 1 DIVISION 1 ZONE 2 DIVISION 2 COMPARISON OF CLASS II CLASSIFICATIONS - DUSTS B.S.6467 & A.S. 2236 -CLASS II U.S.A.-CLASS II DIP - NO SUB - GROUP GROUP E - METAL DUSTS GROUP F - COAL DUSTS GROUP G - GRAIN DUSTS COMPARISON OF GAS GROUPINGS FOR ELECTRICAL EQUIPMENT IEC CENELEC AUSTRALIA U.KBS4683 GERMANY & JAPAN VDEO171 RIIS-TR-TR-79-1 U.S.A. NATIONAL ELECTRIC CODE Representative Gases II IIA II IIA 1 D Propane IIB IIB 2 C Ethylene IIB IIC 3n 3a B Hydrogen IIB 3b ...

The typical fuse consists of an element which is surrounded by a filler and enclosed by the fuse body. The element is welded or soldered to the fuse contacts (blades or ferrules). The element is a calibrated conductor. Its configuration, its mass, and the materials employed are selected to achieve the desired electrical and thermal characteristics. The element provides the current path through the fuse. It generates heat at a rate that is dependent upon its resistance and the load current. Mersen (Gould Ferraz Shawmut) Fuse Construction The heat generated by the element is absorbed by the filler and passed through the fuse body to the surrounding air. A filler such as quartz sand provides effective heat transfer and allows for the small element cross-section typical in modern fuses. The effective heat transfer allows the fuse to carry harmless overloads. The small element cross section melts quickly under short circuit conditions. The filler also aids fuse performance by abs...

Level sensors have been a part of manufacturing processes for several decades, in industries as diverse as food and beverage, semiconductors, and pharmaceutical. However, equipment manufacturers and users may be surprised at both the breadth and sophistication of level sensing alternatives currently available.   Measurements and actions that used to require large, mechanical, and expensive devices can now be performed using advanced, highly versatile technologies that are also durable, precise, and easy to implement. What’s more, a variety of level sensing technology options work well with what have traditionally been challenging substances such as sticky fluids (e.g., molasses, glue, ink) and foam (beer, pulp, hydraulic fluid, soap).   Some users may question the need for such technology - or any level sensing device, for that matter - arguing that existing, “tried-and-true” methods are well-suited for the basic nature of most level sensing tasks. But today’s manufact...