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 network is vital for promptly alerting all personnel in case of danger. The Howler range – including GOLink, HO alarms, and site alert units – offers a scalable, customisable solution suitable for diverse environments.

Overview of HO Alarms?

HO alarms are battery-operated, standalone units intended for mobile spaces such as site cabins or unconnected site areas. No hard-wired connection is required, making installation simple.

• High output: Generally 102 dB at 1 metre.


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


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

HO alarms augment 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 alone or be wired together with up to 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 feasible

Site Alert RF

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

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

Using the GOLink System Effectively

GOLink acts as a wireless hub, supporting complete communication and coordination.

GOLink Interface Unit

This module connects Howler alarms to external systems (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 discreet assistance signal to a control point without triggering full evacuation unless specified.

Effective Site Planning Tips

• Zone planning: Map 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?

more info

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.

Summary & Next Steps

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