System Sensor HR-LF Low Frequency SounderNOTE: This part is discontinued by the manufacturer. Replace with: HRL LF Sounder Strobe. The System Sensor SpectrAlert Advance HR LF is a red, two wire, 12 24 volt, low frequency sounder for wall or ceiling installation.

and confirm wiring continuity before plugging in the speakers

— 4905-9938 SmartSync Control Module

Rotary dial switches are provided for setting the sensor’s address

The Simplex 4903-9148 is a red Speaker Strobe

see SSU-PAM-1 (Space Age) or PAM-1 (Air Products)

B224BI-IV – Ivory isolator detector base

delayed waterflow

and separate synch modules

“ALERT” Marking

UIO assemblies may be mounted in either Edwards cabinets

8°F (-40°C to 66°C)

405 Series strobes exceed UL synchronization requirements (within 10 milliseconds other over a two-hour period) when used with a separately-installed G1M Signal Master