{"product_id":"system-sensor-hw-lf-spectralert-advance-low-frequency-520hz-fire-alarm-sounder","title":"System Sensor HW-LF SpectrAlert Advance Low Frequency 520Hz Fire Alarm Sounder","description":"\u003ch4 class=\"PDq2pG_selectionAnchorContainer\" data-end=\"14\" data-start=\"0\"\u003eDescription\u003cspan class=\"PDq2pG_selectionAnchor\" aria-hidden=\"true\"\u003e\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp data-end=\"389\" data-start=\"16\"\u003eThe System Sensor HW-LF is a SpectrAlert Advance low frequency sounder designed for wall or ceiling installation in fire alarm notification systems. It provides a 520 Hz ±10% square wave tone required for sleeping area applications while supporting flexible 12\/24V operation and simplified installation.\u003c\/p\u003e\n\u003cp data-end=\"389\" data-start=\"16\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"389\" data-start=\"16\"\u003e \u003c\/p\u003e\n\u003ch4 data-end=\"389\" data-start=\"16\"\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystem Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFire Alarm Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHW-LF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow Frequency Sounder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSpectrAlert Advance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow Frequency Fire Alarm Sounder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDevice Color\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWall or Ceiling Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\/24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCircuit Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTwo-Wire Notification Appliance Circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSound Output Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e520 Hz ±10% Square Wave Tone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSleeping areas, residential, commercial, and institutional fire alarm systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTone Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow Frequency Audible Notification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlug-in mounting system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Plate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUniversal mounting plate included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWiring Feature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eShorting spring for continuity testing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSynchronization\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCompatible with MDL3 Sync Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLegacy SpectrAlert devices\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTamper-resistant housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eListings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL S4011, FM 3047563, MEA452-05-E, CSFM 7135-1653:0223 \/ 7125-1653:0224\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 1.0 lb (0.45 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4 data-end=\"411\" data-start=\"391\"\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003eHW-LF\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp data-start=\"341\" data-end=\"964\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThe HW-LF is part of the System Sensor SpectrAlert Advance low frequency notification appliance family developed to meet NFPA 72 requirements for sleeping spaces. The two-wire sounder produces a low frequency 520 Hz square wave tone designed to improve occupant alerting in residential and similar protected areas. Its plug-in design, universal mounting plate, and wiring continuity testing features help reduce installation time and minimize field wiring issues. The appliance is suitable for commercial, institutional, healthcare, and residential fire alarm systems requiring compliant low frequency audible notification.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"966\" data-end=\"980\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"982\" data-end=\"2168\"\u003e\n\u003cli data-start=\"982\" data-end=\"1096\"\u003eLow Frequency Sound Output: Provides a 520 Hz ±10% square wave tone for sleeping area notification requirements.\u003c\/li\u003e\n\u003cli data-start=\"1097\" data-end=\"1205\"\u003eSpectrAlert Advance Series: Designed as part of System Sensor’s advanced fire alarm notification platform.\u003c\/li\u003e\n\u003cli data-start=\"1206\" data-end=\"1290\"\u003eTwo-Wire Operation: Connects to compatible 12\/24V notification appliance circuits.\u003c\/li\u003e\n\u003cli data-start=\"1291\" data-end=\"1386\"\u003eWall and Ceiling Mounting: Supports flexible installation on either wall or ceiling surfaces.\u003c\/li\u003e\n\u003cli data-start=\"1387\" data-end=\"1510\"\u003eNFPA 72 Sleeping Space Compliance: Designed to meet low frequency notification requirements for protected sleeping areas.\u003c\/li\u003e\n\u003cli data-start=\"1511\" data-end=\"1605\"\u003ePlug-In Design: Simplifies installation with minimal intrusion into the electrical back box.\u003c\/li\u003e\n\u003cli data-start=\"1606\" data-end=\"1709\"\u003eUniversal Mounting Plate: Allows easier installation and wiring preparation before device connection.\u003c\/li\u003e\n\u003cli data-start=\"1710\" data-end=\"1814\"\u003eWiring Continuity Testing: Integrated shorting spring helps verify circuit wiring before installation.\u003c\/li\u003e\n\u003cli data-start=\"1815\" data-end=\"1903\"\u003eTamper-Resistant Construction: Helps prevent unauthorized adjustments or interference.\u003c\/li\u003e\n\u003cli data-start=\"1904\" data-end=\"1984\"\u003eLegacy Compatibility: Electrically compatible with legacy SpectrAlert devices.\u003c\/li\u003e\n\u003cli data-start=\"1985\" data-end=\"2085\"\u003eMDL3 Sync Compatibility: Supports synchronization when used with compatible System Sensor modules.\u003c\/li\u003e\n\u003cli data-start=\"2086\" data-end=\"2168\"\u003eSelectable Sounder Output: Provides adjustable low frequency tone configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2170\" data-end=\"2308\"\u003eThe HW-LF delivers the reliability and precision required for low frequency fire alarm notification and sleeping area safety applications.\u003c\/p\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":52136526020906,"sku":"HW-LF","price":62.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/41W3n43QRHL._AC_SL1000.jpg?v=1785186360","url":"https:\/\/iqelectro.com\/products\/system-sensor-hw-lf-spectralert-advance-low-frequency-520hz-fire-alarm-sounder","provider":"IQElectro","version":"1.0","type":"link"}