Air Horns Models 3H & 6H, Hazardous Location, NEMA Type 4X, indoor/outdoor Use |
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Features and Description |
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Technical Information |
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Hazardous Location Types |
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Class I Locations |
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■ According to the NEC, there are three types of hazardous locations. The first type of hazard is one which is created by the presence of flammable gases or vapors in the air, such as natural gas or gasoline vapor. When these materials are found in the atmosphere, a potential for explosion exists, which could be ignited if an electrical or other source of ignition is present. The Code writers have referred to this first type of hazard as Class I. So, a Class I Hazardous Location is one in which flammable gases or vapors may be present in the air in sufficient quantities to be explosive or ignitable. Some typical Class I locations are: |
• | Petroleum refineries, and gasoline storage and dispensing areas; |
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• | Dry cleaning plants where vapors from cleaning fluids can be present; |
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• | Aircraft hangars and fuel servicing areas; and |
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• | Utility gas plants, and operations involving storage and handling of liquified petroleum gas or natural gas. |
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• | All of these are Class I . . . gas or vapor . . . hazardous locations. All require special Class I hazardous location equipment. |
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Class II Locations |
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■ The second type of hazard listed by the National Electrical Code are those areas made hazardous by the presence of combustible dust. These are referred to in the Code as "Class II Locations." Finely pulverized material, suspended in the atmosphere, can cause as powerful an explosion as one occurring at a petroleum refinery. Some typical Class II locations are: |
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• | Plants that manufacture, use or store magnesium or aluminum powders; |
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• | Producers of plastics, medicines and fireworks; |
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• | Producers of starch or candies; |
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• | Spice-grinding plants, sugar plants and cocoa plants; and |
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• | Coal preparation plants and other carbon handling or processing areas. |
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Class III Locations |
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■ Class III hazardous locations, according to the NEC, are areas where there are easily-ignitable fibers or flyings present, due to the types of materials being handled, stored, or processed. The fibers and flyings are not likely to be suspended in the air, but can collect around machinery or on lighting fixtures and where heat, a spark or hot metal can ignite them. Some typical Class III locations are: |
• | Textile mills, cotton gins; |
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• | Cotton seed mills, flax processing plants; and |
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• | Plants that shape, pulverize or cut wood and create sawdust or flyings. |
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• | Wide variety of tones and sizes |
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Technical Information |
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NEMA Type 4X Enclosures constructed for either |
• | indoor or outdoor use to provide a degree of protection to personnel against access to hazardous parts; |
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• | to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (windblown dust); |
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• | to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow, splashing water, and hose directed water); |
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• | that provides an additional level of protection against corrosion; |
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• | and that will be undamaged by the external formation of ice on the enclosure. |
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Comparison Between NEMA Enclosure Type Numbers and IEC Enclosure Classification Designations |
• | IEC Publication 60529 Classification of Degrees of Protection Provided by Enclosures provides a system for specifying the enclosures of electrical equipment on the basis of the degree of protection provided by the enclosure. |
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• | IEC 60529 does not specify degrees of protection against mechanical damage of equipment, risk of explosions, or conditions such as moisture (produced for example by condensation), corrosive vapors, fungus, or vermin. |
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• | The NEMA Standard for Enclosures for Electrical Equipment does test for environmental conditions such as corrosion, rust, icing, oil, and coolants. |
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For this reason, and because the test and evaluations for other characteristics are not identical, the IEC Enclosure Classification Designations cannot be exactly equated with the enclosure Type numbers in this Standard. |
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• | Federal Signal offers a line of air horns in a variety of tones and sizes for the industrial marketplace. |
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• | High, medium and low tones are available which provides a wide range of frequencies and high sound output. |
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• | Federal Signal air horns feature a one-piece, cast aluminum alloy housing which has been treated to provide corrosion-resistance. |
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• | The horns include specialized long-lasting stainless steel diaphragms. |
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• | These precisely machined horns will yield peak performance at proper working air pressures and are virtually indestructible. |
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• | The 3-inch horn (Model 3H) has a threaded female pipe connection. |
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• | The Model 6H features flanges for additional support. |
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• | Federal Signal air horns operate with 20 to 150 p.s.i., (pounds per square inch) but they are tuned for 80 to 90 p.s.i. operation. |
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• | The horn frequency (pitch) depends on both the diameter and length of the projector. Decibel output at 10 feet is 122dBA (132dBA @ 1m). |
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• | The horns require a 120VAC Federal Signal air valve (air valve sold separately). Use Model EVS with the 3H and Model EVL with the 6H.Air horns can be used indoors, outdoors, or anywhere compressed air can be provided. |
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• | Federal Signal Air Horns are the loudest audible signals offered for indoor applications. |
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• | They are not subject to sparking and are ideal for hazardous locations (the valves need to be located in a non-hazardous location). |
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Specifications |
Catalog No. |
Description |
Decibels |
Frequency |
Air Consumption |
Mounting |
required Valve |
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Air Horn, 3" |
122dB@1m |
Frequency 750Hz |
0.20ft³/sec. |
3/8" Pipe |
EVS-120 |
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Air Horn, 6" |
132dB@1m |
Frequency 295Hz |
0.45ft³/sec. |
3/4" Pipe |
EVL-120 |
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Required Air Valves (sold separately) |
Catalog No. |
Description |
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Air Valve, for 3" Air Horns, 120Vac, must be located in a non-hazardous location |
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Air Valve, for 6" Air Horns, 120Vac, must be located in a non-hazardous location |
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Dimensions |
Model |
A inch (mm) |
B inch (mm) |
C inch (mm) |
Diaphragm Ø inch (mm) |
3H |
4.88 (124.0) |
4.75 (121.0) |
3.63 (92.0) |
3.0 (76.0) |
6H |
12.38 (314.0) |
9.5 (241.0) |
6.5 (165.0) |
5.0 (152.0) |
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Repair Parts |
Catalog No. |
Description |
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K8271A020 |
3H Diaphragm |
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K8271A077 |
6H Diaphragm |
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Product image |
Catalog No. and Description |
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Resonating Horn, 120Vac, 115dB@1m, Corrosion-Resistant Cast Aluminum Housing, Brass Projector, NEMA 4, IP54, gray, UL, CSA, FM |
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Resonating Horn, 125Vdc, 118dB@1m, Corrosion-Resistant Cast Aluminum Housing, Brass Projector, NEMA 4, IP54, gray, FM |
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Hazardous Location Vibrating Horn, 120Vac, 50/60Hz, Type 4X Enclosure, Class I, Division 2, Class II, Division 2, Class III, UL, cUL, CSA, Vibratone Series |
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Ex-Proof Vibrating Horn, 120Vac, 110db@1m, Type 4X enclosure, explosion-proof , Corrosion-Resistant Cast Aluminum Housing, UL, cUL, CSA |
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Electro-Mechanical Horn, 120Vac 50/60Hz, 110db@1m, NEMA 4, NEMA 4X, IP55, -54°C/+66°C, UL, CSA, FM, Vibratone |
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Non stock products have a minimum order quantity. |
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Specifications and information are nominal and are subject to change without notice.