{"product_id":"system-sensor-hwl-lf-hrl-lf-low-frequency-wall-sounder","title":"System Sensor HWL-LF\/HRL-LF Low Frequency Wall Sounder","description":"\u003ch2\u003eSystem Sensor HWL-LF\/HRL-LF Low Frequency Wall Sounder\u003c\/h2\u003e\n\n\u003cp\u003eThe System Sensor HWL-LF\/HRL-LF Low Frequency Wall Sounder is a 24V indoor fire-notification appliance designed to produce a 520 Hz ± 10% square-wave tone for sleeping-space applications. Available in white as the HWL-LF or red as the HRL-LF, it supports wall mounting, selectable tone patterns, and high or low output settings.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for hotels, dormitories, apartments, healthcare facilities, and other occupancies requiring low-frequency audible signaling, this L-Series sounder gives installers a compact 2-wire wall-mount solution with plug-in construction. A rotary selector provides Temporal 3, Temporal 4, continuous, and coded tone options, while selectable volume supports different notification requirements. Its universal mounting plate also simplifies wiring continuity checks before the sounder is installed.\u003c\/p\u003e\n\n\u003cp\u003eThe sounder operates from 16 to 33 V with 24 V nominal power and accepts 12 to 18 AWG field wiring. It is electrically compatible with legacy SpectrAlert and SpectrAlert Advance notification appliances and supports the MDL3 SyncCircuit module. The HWL-LF and HRL-LF are UL-listed wall sounders for fire-protective service, with additional FM and CSFM approvals documented for the L-Series low-frequency platform.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e520 Hz Low-Frequency Tone:\u003c\/strong\u003e Produces a 520 Hz ± 10% square-wave audible signal for low-frequency fire-notification applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed and White Variants:\u003c\/strong\u003e Choose the white HWL-LF or red HRL-LF to match installation requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelectable Tone Patterns:\u003c\/strong\u003e Supports Temporal 3, Temporal 4, continuous, and coded operating modes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh and Low Volume:\u003c\/strong\u003e Provides selectable output levels up to 80 dBA UL reverberant at the high setting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug-In Installation:\u003c\/strong\u003e Minimizes intrusion into the back box for faster installation and reduced wiring interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuity Test Support:\u003c\/strong\u003e The mounting plate incorporates a shorting spring for checking field wiring before installing the device.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLegacy Compatibility:\u003c\/strong\u003e Electrically compatible with SpectrAlert and SpectrAlert Advance notification appliances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e System Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e L-Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Low Frequency Wall Sounder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhite Variant:\u003c\/strong\u003e HWL-LF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed Variant:\u003c\/strong\u003e HRL-LF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Type:\u003c\/strong\u003e Audible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e Wired, 2-wire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Indoor wall mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Range:\u003c\/strong\u003e 520 Hz ± 10%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaveform:\u003c\/strong\u003e Square wave\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTone Patterns:\u003c\/strong\u003e Temporal 3, Temporal 4, continuous, coded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume Settings:\u003c\/strong\u003e High and low\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL Reverberant Sound Output:\u003c\/strong\u003e 80 dBA high, 76 dBA low\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 24 V DC\/FWR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage Range:\u003c\/strong\u003e 16 to 33 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMDL3 SyncCircuit Operating Range:\u003c\/strong\u003e 16.5 to 33 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Current Draw, High Setting:\u003c\/strong\u003e 111 mA DC, 151 mA FWR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Current Draw, Low Setting:\u003c\/strong\u003e 80 mA DC, 76 mA FWR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Terminal Wire Gauge:\u003c\/strong\u003e 12 to 18 AWG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 32°F to 120°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Range:\u003c\/strong\u003e 10% to 93% non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 5.6\" L x 4.7\" W x 1.5\" D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Back Boxes:\u003c\/strong\u003e 4\" x 4\" x 1.5\" back box, 4\" octagon back box, double-gang back box, or single-gang 2\" x 4\" x 1.9\" back box for 2-wire installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL Listing:\u003c\/strong\u003e UL 464, S4011\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFM Approval:\u003c\/strong\u003e PR452768\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCSFM:\u003c\/strong\u003e 7135-1653:0516\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Mexico\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"System Sensor","offers":[{"title":"White","offer_id":46717491544261,"sku":"SYS-HWLLF","price":80.0,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":46717491577029,"sku":"SYS-HRLLF","price":82.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0630\/3085\/3829\/files\/1-system-sensor-hwl-lf_24b42bae-d8f0-4729-b87d-06367b917ca4.jpg?v=1786575371","url":"https:\/\/avlgear.com\/products\/system-sensor-hwl-lf-hrl-lf-low-frequency-wall-sounder","provider":"AVLGEAR","version":"1.0","type":"link"}