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Perimeter Gas Monitoring System

Perimeter gas monitoring is a critical safety layer for industrial sites where hazardous gases may migrate beyond process areas into open areas. Also known as fence line or open-area monitoring, these systems provide early detection of gas releases before they escalate into safety, environmental, or regulatory incidents. ProDetec delivers advanced perimeter gas monitoring solutions across Australia, combining proven detection technologies, local expertise, and ongoing service support to help organisations protect people, assets, and surrounding communities.

Our perimeter monitoring capability is designed for complex industrial environments, offering scalable perimeter monitoring systems that deliver real-time visibility across large open areas. From fixed installations to portable monitoring options, ProDetec supports industrial clients with tailored perimeter monitoring services backed by decades of gas detection experience.

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Range of Perimeter Gas Monitoring Detectors

Observer-i Ultrasonic Gas Leak Detector

Observer-i Ultrasonic Gas Leak Detector

Instantly detect pressurised gas leaks with this high-precision, omni-direction acoustic detector utilising Gassonic ultrasonic technology. Works even when traditional methods of gas detection are unsuitable or dependent on ventilation. Features Artificial Neural Network (ANN) technology that distinguishes between real gas leaks and false alarm sources without requiring any in-field training. The Observer-i UGLD provides an industry-leading detection range (up to 28 m) reducing the number of detectors required. Ideal for use in complex, outdoor pipeline systems.  

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SafEye Quasar 960 NH3 Open Path Gas Detector

SafEye Quasar 950 H2S Open Path Gas Detector

The Quasar 950 Open Path Toxic Gas Detector Series offers proven fast and reliable detection of toxic H2S gases and vapours over a line of sight of up to(60m) and are built for continued operation under extreme environmental conditions. The Quasar 950 can be tailored to protect your personnel and high-risk installation. Reliability is key and is assured with SIL2. 

All Quasar 950 detectors incorporate heated windows to minimize any effects from condensation, icing, snow and are totally immune to interference from sunlight or any other sources of radiation such as flare stacks, arc welding or lightning. A range of outputs are available including mA, HART, Modbus RS485 to suit all control systems. 

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SafEye Quasar 960 NH3 Open Path Gas Detector

SafEye Quasar 960 NH3 Open Path Gas Detector

The latest SafEye Quasar open path UV detection technology includes the 960 series. The Quasar 960 models detect toxic Ammonia gas, with path lengths of up to (60m). The Quasar 960 model can be tailored to protect your personnel and high-risk installation. Reliability is key and is assured with SIL2. 

All Quasar 960 detectors incorporate heated windows to minimise any effects from condensation, icing, snow and are totally immune to interference from sunlight or any other sources of radiation such as flare stacks, arc welding or lightning. A range of outputs are available including 0-20mA, HART, Modbus RS485 to suit all control systems. 

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SafEye Quasar 900 Open Path Gas Detector

SafEye Quasar 900 Open Path Gas Detector

The New SafEye Quasar 900 is an open path detection system which provides continuous monitoring for combustible hydrocarbon gases. It employs “spectral fingerprint” analysis of the atmosphere using the Differential Optical Absorption Spectroscopy (DOAS) technique. The Quasar 900 consists of a Xenon Flash infrared transmitter and infrared receiver, separated over a line of sight from (7m) up to (200m) in extremely harsh environments where dust, fog, rain, snow or vibration can cause a high reduction of signal.  

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GD1 H2S Laser Diode Open Path Detector

GD1 H2S Laser Diode Open Path Detector

The Simtronics GD1 sets a new standard for toxic gas detection. Using a laser diode technology, the GD1 delivers enhanced coverage and fail-safe detection. The performance improvement marks a genuine step change for safety systems and life cycle cost savings. 

The GD1 has been designed with features that provide an effective response to the detection of gas hazards in a wide range of industrial environments from offshore production facilities to wastewater treatment plants. 

At the heart of the detector is a laser diode that eliminates environmental effects from sun, rain and fog. The laser scans single absorption lines where there is no interference from other gases. 

Unlike traditional methods for detecting H2S (MOS or EC cell) the GD1 needs no recalibration and can replace multiple standard detectors to cover the same risk. 

The complete optomechanical design and construction is so stable that an ultra-fast speed of response can be achieved whilst providing unparalleled service life and detector stability, thus saving on maintenance and service costs. 

Supplied with worldwide hazardous area approvals. Sui table for use in systems with SIL 2 requirement. 

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BM25 Wireless Area Monitor

BM25 Wireless Area Monitor

The BM25 packs the benefits of a fixed system area monitor into a rugged, user-friendly and transportable instrument. It was designed to detect one to five gases for mobile or temporary work applications, team protection, area surveillance or places where fixed detection systems are not suitable.

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What is Perimeter Gas Monitoring?

Perimeter gas monitoring refers to the continuous detection of hazardous gases along the perimeter or in open areas of an industrial facility.

Unlike point detection inside buildings or plant rooms, perimeter systems are designed to monitor wide, outdoor spaces where gases can disperse unpredictably due to wind, terrain, and atmospheric conditions.

This form of industrial perimeter monitoring plays a vital role in identifying leaks early, demonstrating regulatory compliance, and reducing off-site risk to neighbouring properties or the public.

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Fence Line Monitoring Explained

Fence line monitoring is a specific application of perimeter monitoring in which gas detectors are installed along a facility’s boundary. These systems track gas concentrations at the site’s edge, helping operators understand whether emissions are contained or migrating beyond controlled zones.

Fence line systems are commonly used to:

  • Detect fugitive emissions before they reach unsafe levels
  • Provide environmental reporting data
  • Support community safety and transparency
  • Trigger early alerts for emergency response

As part of a complete perimeter monitoring service, fence line monitoring enables proactive risk management rather than reactive incident response.

Open-Path vs Point Detection Technology

There are two primary approaches used within a perimeter monitoring system:

Open-path detection measures gas concentrations across a beam or path, using a transmitter and receiver unit positioned at either end of a perimeter. This setup makes it ideal for large open areas where gases may disperse over distance, and it is highly effective at detecting low-level, diffuse emissions.

Point detection, by contrast, measures gas at a fixed location. When deployed strategically around a perimeter, multiple point detectors can create a comprehensive monitoring network.

ProDetec designs perimeter solutions that may use either or both technologies, depending on site layout, gas types, and risk profile.

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Gases We Monitor

ProDetec’s perimeter solutions are capable of detecting a wide range of hazardous and regulated gases, including:

  • Benzene
  • Methane
  • Volatile Organic Compounds (VOCs)
  • Hydrogen sulphide (H₂S)
  • Carbon monoxide (CO)
  • Ammonia
  • LEL combustible gases
  • Oxygen deficiency

By tailoring sensor selection and system architecture, each perimeter monitoring system is optimised for the gases most relevant to your operation.

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Applications & Industries

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Oil & Gas Facilities

Oil and gas sites rely heavily on perimeter monitoring systems to detect methane, hydrogen sulphide, and other hydrocarbons. Early detection at the perimeter helps prevent flammable atmospheres, environmental breaches, and unplanned shutdowns.

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Chemical & Petrochemical Plants

Chemical processing facilities use industrial perimeter monitoring to control VOC emissions, toxic releases, and combustible gas risks. Continuous monitoring supports compliance obligations and community safety expectations.

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Mining Operations

Open-cut and underground mining sites benefit from perimeter gas monitoring to manage emissions from processing plants, ventilation exhausts, and fuel storage areas. These systems provide an added layer of protection beyond internal detection.

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Recycling & Waste Facilities

Waste-handling and recycling operations often generate methane, VOCs, and other odorous gases. A robust perimeter monitoring service helps operators detect emissions early and manage environmental impact.

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Our Perimeter Monitoring Solutions

ProDetec delivers flexible, scalable solutions to meet the demands of diverse industrial environments across Australia.

Fixed Perimeter Detection Systems

Fixed installations form the backbone of most perimeter gas monitoring strategies. These systems provide continuous, unattended monitoring and integrate with site SCADA, alarms, and safety systems.

ProDetec supplies and supports a wide range of fixed solutions, designed specifically for outdoor and fence-line applications. These systems offer high sensitivity, environmental resilience, and reliable long-term performance when installed as part of a comprehensive perimeter monitoring system.

Portable Area Gas Monitors

Portable monitors provide additional flexibility for temporary works, shutdowns, or changing site conditions. They are commonly used to supplement fixed systems during maintenance or construction activities.

ProDetec offers trusted portable solutions enabling rapid deployment and short-term perimeter monitoring without permanent installation.

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Key Features & Technology

ProDetec’s industrial perimeter monitoring solutions are engineered to perform reliably in harsh Australian conditions. Key features include:

  • Real-time gas concentration monitoring
  • Multi-gas detection capability
  • Weather-resistant housings for outdoor use
  • Integration with alarms, telemetry, and control systems
  • Scalable architecture for expanding sites
  • Data logging for compliance and reporting

Many perimeter solutions also integrate seamlessly with broader site safety infrastructure, including multi-gas detection systems, providing a unified view of gas risks across indoor and outdoor environments.

To maintain accuracy and reliability, ProDetec systems are supported using certified calibration gas, ensuring sensors perform within specification throughout their service life.

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Service & Support Australia-Wide

A perimeter monitoring system is only as effective as the service behind it. ProDetec provides end-to-end support across Australia, from initial risk assessment and system design through to installation, commissioning, and ongoing maintenance.

Our nationwide service capability ensures fast response times, consistent performance, and long-term reliability.

Whether you require a single fixed gas detector at a site boundary or a fully integrated perimeter monitoring network, ProDetec delivers expert support backed by decades of experience working with industrial gas detectors.

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Talk to ProDetec About Perimeter Monitoring

Protect your people, your site, and your surrounding community with a proven perimeter monitoring service tailored to your operation. ProDetec works with Australian industries to design and support perimeter gas-monitoring solutions that meet regulatory requirements and real-world operational demands. Contact our team to discuss your site requirements and explore the right perimeter monitoring system for your facility.

FAQs

What is fence-line gas monitoring?

Fence line gas monitoring is a form of perimeter gas monitoring that focuses on detecting hazardous gases along the boundary of a site. It helps identify emissions before they migrate off-site or reach unsafe levels.

What gases can perimeter monitors detect?

Perimeter monitoring systems can detect a wide range of gases, including methane, VOCs, benzene, H₂S, CO, ammonia, LEL combustibles, and oxygen deficiency, depending on the selected sensors and system design.

How often do systems need calibration?

Calibration frequency depends on sensor type, environmental conditions, and regulatory requirements. Most perimeter monitoring systems require routine calibration at scheduled intervals to ensure accuracy and compliance.

Do you offer rental or hire options?

Yes. ProDetec offers flexible rental and hire solutions for portable and temporary industrial perimeter monitoring applications, including short-term projects, shutdowns, and emergency response situations.

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