System Sensor HRL2-LF
System Sensor HRL2-LF
Out of stock; call for lead time
The System Sensor HRL2-LF is a standard-size, red, wall-mounted low-frequency sounder built on the L-Series second-generation platform, producing the 520 Hz tone required for sleeping-area alerting under NFPA 72. Integrated diagnostic test points let a technician confirm supply voltage at the device quickly, and it's electrically compatible with legacy SpectrAlert and SpectrAlert Advance wiring, so it can drop into an existing circuit without a rewire.
Key Features
- Standard-size wall-mount low-frequency sounder, red housing
- Integrated diagnostic test points for rapid voltage checks
- Electrically compatible with legacy SpectrAlert/SpectrAlert Advance circuits
- Rotary switch for High/Low, Temp3, Temp4, and Continuous settings
Technical Specifications
- Tone: 520 Hz square wave
- Voltage: 24V, 2-wire
- Mounting: Wall, red housing

