Training in the use of Area (Sentinel) Gas Alarms.

Selection and Positioning Area Gas Alarms

Background to Area Gas Alarms

Gas alarms designed for specific areas or sentinels have been present in various forms for numerous years. Initially, these devices comprised an alarm box attached to a portable gas detector, triggering at predefined concentrations. Subsequently, bespoke units emerged, interconnected by cables to form a grid.

In recent times, area gas alarms have evolved into more sophisticated systems, incorporating wireless grids that interact with remote computers and isolation controls. The fundamental prerequisites for these instruments encompass durability, stability, extended run times, and an alarm that is easily perceptible both visually and acoustically. One might simplistically describe them as “multi-gas detectors with large batteries and flashing lights,” although manufacturers may have varying perspectives.

Area GAs Alarm

Why Choose Area Gas Detectors?

Area gas alarms prove beneficial in diverse applications, such as during confined space entry, breaking containment or replacing fixed gas alarm systems during maintenance and shutdowns. Suppliers advocate creating a virtual gas-free fence line around the workplace by strategically positioning these devices, thereby establishing safe working zones and escape routes.

While on the surface, area gas alarms seem like an ideal solution for handling hazardous gases, their effectiveness hinges on proper usage and placement. Pros and cons exist, and the value of these detectors depends on factors such as gas type and the environment in which they are deployed.

Placement Considerations for Area Gas Detectors:

When detecting lighter-than-air flammable gases like methane in an area with multiple workers, various placement strategies arise:

  • Central positioning in the workplace.
  • Downwind of potential release points.
  • Upwind of the work location.
  • A grid system installation around the perimeter and within the workplace.

Choosing the Right Solution Takes Time and Knowledge.

Confusion can arise in confined spaces, where detectors may need placement in poorly ventilated areas, low points, locations unaffected by drafts, compartments, chambers, baffled tanks, or a combination of these. Deciding on the right placement necessitates a qualified and experienced authorised gas tester to undertake a task-specific risk assessment.

Our new training module focused on the use of area gas detectors. Attendees gain insights that prove invaluable in the workplace, often resulting in substantial cost savings.

If you would like to know more – please contact us.

Question for Readers:

After placing an area gas detector in its intended position, how far away from this point will it be able to detect the target gas(es)?