System Sensor HR-LF Low-Frequency Sounder

The System Sensor HR-LF offers the most versatile and easy-to-use line of low-frequency sounder and low-frequency sounder strobes. With red plastic housings, dual listed for wall and ceiling mounting, SpectrAlert Advance can meet virtually any application requirement.

The System Sensor HR-LF wall-mount low-frequency sounder and low-frequency sounder strobes. They a r e designed to address the NFPA 72 sleeping space requirements that require a low-frequency notification appliance. That operates within the frequency range of 520 Hz ± 10% and is of a square wave tone. Include a variety of features that increase their application versatility and simplify installation. All devices feature plug-in designs with minimal intrusion into the back box, making installations fast. Foolproof, virtually eliminating costly and time-consuming ground faults.

Simplify installation and protect devices from construction damage. SpectrAlert Advance utilizes a universal mounting plate with an onboard shorting spring. Installers can test wiring continuity.

Installers can easily adapt devices to suit a wide range of application requirements. Using field-selectable candela settings, automatic selection of 12- or 24-volt operation. And a rotary switch for 520 Hz low-frequency sounder tones.

Features / Specifications

• 520 Hz ± 10% square wave tone
• Plug-in design with minimal intrusion into the back box
• Tamper-resistant construction
• Field-selectable candela settings on wall units: 135, 150, 177, and 185
• Rotary switch for low-frequency sounder tone
• Universal mounting plate for wall units
• Mounting plate shorting spring checks wiring continuity.
• Electrically compatible with legacy SpectrAlert devices
• Compatible with MDL3 sync module
• Listed for ceiling or wall mounting