Understanding Howler Systems in Fire Safety

Construction and temporary sites face unique fire risks due to variable layouts, mobile equipment, and dispersed work zones. A reliable alarm setup is essential for quickly notifying everyone in case of danger. The Howler range – including GOLink, HO alarms, and site alert units – offers a flexible, customisable solution suitable for varied environments.

Overview of HO Alarms?

HO alarms are self-contained, standalone units designed for mobile spaces such as portable offices or unconnected site areas. No hard-wired connection is required, making installation simple.

• High output: Typically 102 dB at 1 metre.


• Visual indicators: Optional units feature a strobe light alongside the audible siren.


• Weather resistance: Many are IP-rated for external or semi-exposed conditions.

HO alarms extend main systems, securing areas not reached by the primary site alert infrastructure.

The Site-Wide Site Alert Systems

The Howler Site Alert system suits smaller and medium-sized sites. Each unit can work independently or be wired together with a maximum of 20 others. When activated, all connected units will sound and flash, ensuring comprehensive coverage.

• Audible warning: Approx. 100 dB at 1 m


• Visual cue: Built-in red LED beacon


• Best used where cable runs are feasible

Site Alert RF

Where howler site alert systems wiring is impractical, the Site Alert RF allows up to 30 devices to connect wirelessly to a master unit. With howler golink systems up to 1 km open-air range and multiple frequency channels, this setup is ideal for larger or temporary layouts.

Hybrid installations using both wired and wireless units are common and offer better coverage.

GOLink Integration

GOLink acts as a radio-linked backbone, supporting site-wide communication and coordination.

GOLink Interface Unit

This module connects Howler alarms to third-party infrastructure (e.g. CCTV, access control), allowing signals to cascade when an event occurs. Up to 127 stations can communicate over the GOLink network.

First Aid Alert Feature

Some models, such as the H05 GOLink, incorporate separate fire and first aid switches. The latter sends a non-intrusive assistance signal to a control point without triggering full evacuation unless specified.

Effective Site Planning Tips

• Zone planning: Divide the site into clear zones (e.g. cabins, workshops) and locate alarms for optimal reach.


• Wired & wireless balance: Use wired alarms where infrastructure allows; RF units in more temporary areas.


• Regular testing: Weekly or monthly inspections to confirm functionality and battery levels.


• Staff training: Ensure all personnel understand alarm tones, first aid indicators, and emergency response steps.

Frequently Asked Questions

How many alarms can I link together?

Up to 20 wired Site Alert units using 2-core cable.

Wireless range of Site Alert RF?

Approx. 1 km in open air (may reduce with obstacles).

Is a panel required?

No. HO alarms operate independently without central panels.

Can GOLink connect to other systems?

Yes, via the Interface Unit. External systems such as CCTV and turnstiles can be integrated.

Purpose of switch covers?

It reduces false alarms by requiring cover removal before pressing. An alert sounds if tampered with.

Can wired and RF units be used together?

Yes. Mixed networks are common and synchronised through the GOLink system.

First aid switch impact?

No. The signal is isolated unless configured otherwise.

Final Thoughts

Reliable fire safety relies on adaptable, clearly communicated alarm strategies. The Howler range, including HO alarms, Site Alerts and GOLink systems, provides robust protection for sites of all types. For product specifications, planners, or live demonstrations, visit the Howler section at FireSense.