System Sensor HRL2-LF — Manufacturer product image

Sounder

HRL2-LF

Low-frequency wall sounder

A wall sounder providing low-frequency audible notification on a compatible fire alarm circuit.

520 Hz square-wave tone
High and low output settings
DVM diagnostic test points

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Product specifications.

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System Sensor HRL2-LF specifications
Brand	System Sensor
Model	HRL2-LF
Product type	Sounder
Operating voltage	16–33 VDC; 16.5–33 V with MDL Sync Module
Mounting	Wall
Colour	Red
Tone frequency	520 Hz ±10%, square wave
Nominal voltage	Regulated 24 VDC
Operating temperature	0°C to 49°C
Operating humidity	10–93% RH, non-condensing
Input wire gauge	12–18 AWG
Dimensions	144 × 119.4 × 41.3 mm
Tone patterns	Temporal 3, Temporal 4, Continuous, Coded

Official product information

Manufacturer product page Official datasheet

Specifications checked on 25 October 2026. Details refer to the linked manufacturer variant; confirm the supplied model, compatibility and included accessories with your quotation.