{"id":1882,"date":"2014-11-13T08:11:55","date_gmt":"2014-11-13T07:11:55","guid":{"rendered":"http:\/\/www.industronic-blog.com\/?p=1882"},"modified":"2019-03-19T10:18:42","modified_gmt":"2019-03-19T09:18:42","slug":"sirens-mass-notification-since-1819","status":"publish","type":"post","link":"https:\/\/www.industronic.com\/blog\/sirens-mass-notification-since-1819\/","title":{"rendered":"Sirens &#8211; Mass Notification since 1819"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1887 size-full\" src=\"https:\/\/www.industronic.com\/blog\/wp-content\/uploads\/2014\/11\/2_retusch.jpg\" alt=\"\" width=\"838\" height=\"1200\" srcset=\"https:\/\/www.industronic.com\/blog\/wp-content\/uploads\/2014\/11\/2_retusch.jpg 838w, https:\/\/www.industronic.com\/blog\/wp-content\/uploads\/2014\/11\/2_retusch-210x300.jpg 210w, https:\/\/www.industronic.com\/blog\/wp-content\/uploads\/2014\/11\/2_retusch-768x1100.jpg 768w, https:\/\/www.industronic.com\/blog\/wp-content\/uploads\/2014\/11\/2_retusch-715x1024.jpg 715w\" sizes=\"auto, (max-width: 838px) 100vw, 838px\" \/>A siren is an acoustic device which is normally characterized by a high-pitched whine risingup and down.They have always served primarily as a mass notification system in military and civil areas.Especially with disaster alerts like fire or flooding, sirens are used to effectively warn and inform the public.In industrial sectors, sirens are mostly used as an extensive (several sq. km) alarm systemfor broadcasting fire or gas alarms, for example.Moreover, sirens are implemented for signaling purposes like notification of breaktime in industrial applications.In general, there are three types of sirens:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul><\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Mechanical sirens<\/li>\n<li>Pneumatic sirens<\/li>\n<li>Electronic sirens<\/li>\n<\/ul>\n<p>Mechanical sirens were designed as motor sirens until the end of the last century.<!--more-->The common German type of motor sirens was equipped with a three-phase motor of approximately 5 kVA and 35 A starting current. Due to the interruption of air flow caused by rotation, the characteristic acoustic signal is generated.Approximately 80% of all sirens in use in Germany are still mechanical \/ or motor sirens.The disadvantages of a mechanical siren are manifold:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul><\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Mechanical components are vulnerable to damage and require intensive maintenance<\/li>\n<li>No batteries (= high power consumption)<\/li>\n<li>Only one fixed frequency (variations solely possible via switch on \/off)<\/li>\n<li>No speech announcements possible<\/li>\n<\/ul>\n<p>Pneumatic sirens create their signal similar to a mechanical siren with cyclical interruptions of the air flow. However, in contrast to motor sirens, pneumatic sirens generate the air flow by compressed air.For approximately 25 years now, modern siren systems are designed as electronic sirens.They use conventional driver systems (dynamic midrange driver for horn speakers), combined with a horn system. Therefore, the tone signal is generated with a loudspeaker as well as an electronic amplifier.The advantages are obvious:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul><\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Almost no maintenance required<\/li>\n<li>Significantly less power consumption, thus battery backup possible<\/li>\n<li>Speech announcements possible (which cannot be realized with mechanical or pneumatic sirens)<\/li>\n<li>Various signals (frequency and timed sequence) possible<\/li>\n<\/ul>\n<p>What are your thoughts about sirens? INDUSTRONIC now offers a siren solution. Why don\u2019t you have a look on our <a title=\"flyer\" href=\"\/wp-content\/uploads\/Flyer_ASH_SirenHorn_EN_web.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">flyer<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A siren is an acoustic device which is normally characterized by a high-pitched whine risingup and down.They have always served primarily as a mass notification system in military and civil areas.Especially with disaster alerts like fire or flooding, sirens are used to effectively warn and inform the public.In industrial sectors, sirens are mostly used as [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":1887,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[135],"class_list":["post-1882","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-sirens"],"_links":{"self":[{"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/posts\/1882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/comments?post=1882"}],"version-history":[{"count":2,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/posts\/1882\/revisions"}],"predecessor-version":[{"id":3905,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/posts\/1882\/revisions\/3905"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/media\/1887"}],"wp:attachment":[{"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/media?parent=1882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/categories?post=1882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.industronic.com\/blog\/wp-json\/wp\/v2\/tags?post=1882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}