Understanding Howler Systems in Fire Safety

Construction and temporary sites face unique fire risks due to variable layouts, mobile equipment, plus dispersed work zones. A dependable alarm setup is vital for quickly notifying all personnel in case of danger. The Howler range – including GOLink, HO alarms, and site alert units – offers a scalable, customisable approach suitable for diverse environments.

What are HO Alarms?

HO alarms are self-contained, standalone units intended for temporary spaces such as site cabins or unconnected site areas. No hard-wired connection is required, making installation straightforward.

• High output: Typically 102 dB at 1 metre.


• Strobe integration: Available units feature a strobe light alongside the audible siren.


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

HO alarms augment main systems, securing areas not reached by the central site alert infrastructure.

The Howler Site Alert Systems

The Howler Site Alert system is suited to compact 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 broad coverage.

• Audible warning: Approx. 100 dB at 1 m


• Visual cue: Built-in red LED beacon


• Best used where cable runs are straightforward

Wireless Variant

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

Hybrid arrangements using both wired and wireless units are common and deliver better coverage.

GOLink Integration

GOLink acts as a wireless hub, supporting complete communication here 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.

Best Practices for Deployment

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


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

How far does it reach?

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

Do HO alarms need a control panel?

No. HO alarms operate independently without central panels.

Integration options?

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

What is an alarmed switch cover?

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

Hybrid system support?

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

Does first aid alert trigger full system?

No. The signal is isolated unless configured otherwise.

Final Thoughts

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