System Sensor HGWL-LF Compact Low-Frequency Wall Sounder, White

System Sensor HGWL-LF Compact Low-Frequency Wall Sounder

The System Sensor HGWL-LF Low-Frequency Sounder is a compact white fire notification appliance designed for indoor wall installation. It produces a 520 Hz ± 10% square-wave tone for sleeping-space notification and operates from a nominal 24 VDC or full-wave rectified power source across a 16 to 33 V operating range.

The compact housing suits apartments, hotels, dormitories, healthcare facilities, and other applications where a smaller low-frequency wall sounder is preferred. Installers can select Temporal 3, Temporal 4, continuous, or coded operation along with high and low volume settings. Its plug-in construction also reduces intrusion into the electrical back box during installation.

A universal mounting system incorporates a shorting spring so technicians can verify wiring continuity before attaching the appliance. The HGWL-LF is electrically compatible with legacy SpectrAlert and SpectrAlert Advance notification devices and works with supported SyncCircuit modules. System Sensor lists this model to UL 464 for fire-protective service and specifies a broad indoor operating temperature range.

Key Features

• 520 Hz Low-Frequency Tone: Produces a 520 Hz ± 10% square-wave signal for low-frequency fire notification applications.
• Compact Wall Design: Measures approximately 5.3" x 3.5" x 1.5" for installations where a smaller notification appliance is desirable.
• Selectable Signal Patterns: Supports Temporal 3, Temporal 4, continuous, and coded operation.
• High and Low Volume: Allows installers to select the appropriate audible output while managing notification circuit current.
• Plug-In Construction: Minimizes intrusion into the back box and simplifies installation or servicing.
• Continuity Test Feature: An onboard mounting-plate shorting spring enables field wiring checks before device installation.
• Legacy Compatibility: Electrically compatible with SpectrAlert and SpectrAlert Advance notification appliances.

Technical Specifications

• Brand: System Sensor
• Model: HGWL-LF
• Series: L-Series
• Product Type: Compact Low-Frequency Sounder
• Alarm Type: Audible
• Color: White
• Application: Indoor
• Mounting: Wall Mount
• Connectivity: Wired, 2-wire
• Frequency Range: 520 Hz ± 10%
• Waveform: Square wave
• Tone Settings: Temporal 3, Temporal 4, continuous, coded
• Volume Settings: High and low
• Temporal 3 High Current Draw: 108 mA DC, 150 mA FWR
• Temporal 3 Low Current Draw: 78 mA DC, 76 mA FWR
• Temporal 4 High Current Draw: 111 mA DC, 151 mA FWR
• Temporal 4 Low Current Draw: 80 mA DC, 76 mA FWR
• Continuous High Current Draw: 111 mA DC, 151 mA FWR
• Continuous Low Current Draw: 80 mA DC, 76 mA FWR
• Coded High Current Draw: 111 mA DC, 151 mA FWR
• Coded Low Current Draw: 80 mA DC, 76 mA FWR
• UL Reverberant Sound Output, High: 80 dBA
• UL Reverberant Sound Output, Low: 76 dBA
• ULC Anechoic Sound Output, High: 82 dBA
• ULC Anechoic Sound Output, Low: 78 dBA
• Nominal Voltage: Regulated 24 V DC/FWR
• Operating Voltage Range: 16 to 33 V
• SyncCircuit Module Operating Range: 16.5 to 33 V
• 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 1.5" D
• Compatible Surface-Mount Back Box: SBBGWL
• Surface-Mount Dimensions with SBBGWL: 5.4" L x 3.6" W x 3" D
• Electrical Compatibility: SpectrAlert and SpectrAlert Advance devices
• Compatible Sync Modules: MDL3R, MDL3RA, MDL3W, MDL3WA
• Listing: UL 464
• UL File: S4011
• FM Approval: PR452768
• CSFM: 7135-1653:0516
• Country of Origin: Mexico