System Sensor HGRL2-LF Compact Low-Frequency Wall Sounder, Red

System Sensor HGRL2-LF Compact Low-Frequency Wall Sounder

The System Sensor HGRL2-LF Compact Low-Frequency Wall Sounder is a red, second-generation L-Series notification appliance for fire alarm systems in sleeping-space applications. It generates a 520 Hz ± 10% square-wave signal, operates from regulated 24 VDC, and provides selectable Temporal 3, Temporal 4, continuous, and coded patterns with high or low output.

Its compact housing suits hotels, apartments, dormitories, healthcare facilities, and other projects needing a compact 520 Hz fire alarm sounder. Measuring approximately 5.3" x 3.5" x 1.6", it supports single-gang installation and includes diagnostic voltage test points for faster end-of-line troubleshooting without removing the appliance.

The plug-in mounting system incorporates a shorting spring so installers can check field wiring before attaching the device. It operates across 16 to 33 VDC and maintains electrical compatibility with earlier SpectrAlert, SpectrAlert Advance, and L-Series notification products. UL, ULC, FM, and CSFM approvals support use in professionally designed fire notification systems.

Key Features

• 520 Hz Low-Frequency Signal: Produces a 520 Hz ± 10% square-wave tone for sleeping-area notification applications.
• Compact Red Housing: Provides a smaller wall-mount footprint for installations where available wall space is limited.
• Selectable Audible Patterns: Offers Temporal 3, Temporal 4, continuous, and coded operating modes.
• High and Low Output: Lets installers select between two audible levels according to system requirements.
• DVM Diagnostic Test Points: Provides access for digital voltage measurements without removing the sounder from its mounting position.
• Plug-In Installation: Uses a mounting plate with an onboard shorting spring for wiring continuity checks before final installation.
• Backward Electrical Compatibility: Integrates with legacy SpectrAlert, SpectrAlert Advance, and L-Series devices within the specified voltage range.

Technical Specifications

• Brand: System Sensor
• Model: HGRL2-LF
• Series: L-Series Second Generation
• Product Type: Compact Low-Frequency Sounder
• Color: Red
• Application: Indoor fire notification
• Mounting: Compact wall mount
• Frequency Range: 520 Hz ± 10%
• Waveform: Square wave
• Sound Patterns: Temporal 3, Temporal 4, continuous, coded
• Volume Settings: High and low
• Temporal 3 High: 79 mA current draw, 80 dBA reverberant sound output
• Temporal 3 Low: 79 mA current draw, 76 dBA reverberant sound output
• Temporal 4 High: 79 mA current draw, 80 dBA reverberant sound output
• Temporal 4 Low: 78 mA current draw, 76 dBA reverberant sound output
• Continuous High: 82 mA current draw, 80 dBA reverberant sound output
• Continuous Low: 78 mA current draw, 76 dBA reverberant sound output
• Coded High: 82 mA current draw, 80 dBA reverberant sound output
• Coded Low: 79 mA current draw, 76 dBA reverberant sound output
• Nominal Voltage: Regulated 24 VDC
• Operating Voltage Range: 16 to 33 VDC, 24 V nominal
• Operating Voltage with MDL Sync Module: 16.5 to 33 VDC, 24 V nominal
• Input Terminal Wire Gauge: 12 to 18 AWG
• Operating Temperature: 32°F to 120°F
• Humidity Range: 10% to 93% non-condensing
• Dimensions: 5.3" L x 3.5" W x 1.6" D
• Junction Box: Single gang
• Compatible Surface-Mount Back Box: SBBGRL
• Diagnostic Feature: Digital voltage meter test points
• Electrical Compatibility: SpectrAlert, SpectrAlert Advance, and L-Series devices at 16 to 33 VDC
• Synchronization: Approved power supplies supporting System Sensor Sync or System Sensor MDL Sync Module
• UL Listing: S4011
• ULC: Listed
• FM Approval: PR472993
• CSFM: 7135-1653:0516
• Country of Origin: Mexico