System Architecture: Flexibility Through Modular Design

The system centres around the GA-300.E series of analogue gas controllers, available in two configurations to suit different monitoring requirements:

• GA-300.E02: Two detector control
• GA-300.E04: Four detector control

Each controller features compact DIN rail mounting (71-106mm width depending on model) enabling installation in the extensive range of DIN rail enclosures available on the market. The controllers operate on 230V AC mains power with optional 12V DC battery backup, ensuring continuous operation during power disruptions.

The system’s true strength lies in its extensive range of GS-220.BC.V.ZETA detectors, with over 25 different gas-specific variants available. This diverse portfolio enables users to create bespoke monitoring solutions by mixing and matching detector types within a single controller. These ATEX-certified detectors provide 4-20mA analogue outputs, enabling precise gas concentration monitoring rather than simple threshold detection.

Comprehensive Gas Detection Capabilities

Combustible Gas Detection

The combustible gas detector range monitors gases from 0-100% LEL (Lower Explosive Limit), covering an extensive array of hydrocarbons and organic solvents:

Hydrocarbon Gases: Methane, propane, n-butane, n-pentane, n-hexane, n-heptane, n-octane, and ethylene provide coverage for most industrial fuel gases and natural gas applications.

Alcohols and Solvents: Methanol, ethanol, iso-propanol, acetone, MEK (methyl ethyl ketone), toluene, and ethyl acetate detection addresses paint shops, chemical processing, and solvent storage areas.

Specialised Detection: Hydrogen monitoring for battery rooms and industrial processes, plus unleaded petrol detection for fuel handling areas.

Toxic Gas Monitoring

The toxic gas range addresses workplace exposure limits with targeted detection ranges:

• Carbon Monoxide: 0-500ppm for boiler rooms and enclosed parking areas
• Hydrogen Sulphide: 0-100ppm for wastewater treatment and oil refining
• Nitrogen Dioxide: 0-30ppm for chemical processing environments
• Chlorine: 0-10ppm for water treatment facilities
• Ammonia: 0-100ppm for refrigeration and chemical applications
• Sulphur Dioxide: 0-20ppm for industrial emissions monitoring
• Oxygen: 0-25%Vol for confined space safety

Refrigerant Gas Detection

With increasing focus on refrigerant leak detection for both safety and environmental compliance, the range includes:

• Ammonia: 0-2000ppm for industrial refrigeration systems
• Fluorinated Refrigerants: R-134a, R-404a, R-407c, R-410a coverage for commercial HVAC systems
• Hydrocarbon Refrigerant: R-290 (propane) detection for natural refrigerant applications

Distinctive System Features

Advanced Sensor Technology

Each detector employs the most appropriate sensing technology for its target gas: catalytic sensors for combustible gases, electrochemical cells for toxic gases and semiconductor sensors for refrigerants. This targeted approach ensures optimal sensitivity and selectivity for each application.

Non-Intrusive Calibration

The system’s magnetic calibration capability represents a significant operational advantage. Technicians can perform calibration checks without opening detector enclosures, maintaining ATEX certification whilst simplifying maintenance procedures. This feature proves particularly valuable in hazardous area installations.

Intelligent Diagnostics

Self-diagnostic functions continuously monitor sensor condition and communication integrity. The system provides differentiated fault indication through LED displays, enabling maintenance teams to identify issues before they compromise safety.

Multi-Level Alarm Architecture

The controllers provide two distinct alarm levels with differential audible signals, allowing for graduated response protocols. Individual channel relay outputs activate at the “Danger” level, whilst a common alarm relay triggers at the upper threshold.

Integration with Fire and Safety Systems

The system’s design facilitates seamless integration with broader safety infrastructure:

Fire Alarm Integration: Volt-free relay contacts provide direct interface capability with any fire alarm system with a monitored input. This enables automatic suppression system activation or building evacuation protocols when gas concentrations exceed safe limits.

Building Management Systems: The outputs can feed directly into building management platforms, providing continuous monitoring data and trend analysis capabilities.

Emergency Response: The common alarm relay and individual channel outputs allow for differentiated response strategies – from local ventilation activation to facility-wide emergency shutdown procedures.

Technical Robustness

The detectors’ IP65-rated aluminium enclosures withstand harsh industrial environments, operating reliably from -20°C to +50°C with up to 90% relative humidity. ATEX certification (II 2G Ex ma (ib) e IIC T4 Gb) ensures safe operation in Zone 1 and Zone 2 hazardous areas.

Power consumption remains minimal at just 3W per detector, making the system suitable for battery backup applications where continuous operation during power outages is critical.

Applications Across Industries

This versatility makes the system applicable across numerous sectors:

• Oil & Gas: Hydrocarbon leak detection in processing facilities and storage areas
• Chemical Manufacturing: Multi-gas monitoring for process safety and worker protection
• Food & Beverage: Refrigerant monitoring in cold storage and processing facilities
• Automotive: Paint shop solvent detection and exhaust gas monitoring
• Utilities: Hydrogen monitoring in power generation and water treatment chlorine detection
• Commercial Buildings: Car park carbon monoxide detection and HVAC refrigerant monitoring

View our Analogue Gas Detection range.

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Advanced early warning technology

Built on cutting-edge blue LED light scattering technology, both models in the Velocity range provide ultra-sensitive smoke detection capable of identifying fires in their earliest, often invisible, stages. With a detection sensitivity of up to 0.005%/m, the detectors are 1,000 times more sensitive than conventional point-type smoke detectors making them ideal for the protection of high-risk or high-value buildings.

What is aspiration smoke detection?

Aspirating smoke detection is an advanced method of fire detection that works by actively drawing air from protected areas, through a network of sampling pipes, into a central detector. Inside the detector, the air is continuously analysed for the presence of microscopic smoke particles.

This approach enables the detector to identify the earliest signs of a fire, often before smoke is visible to the human eye. This makes ASDs ideal for environments where early warning is critical, such as data centres, cleanrooms, and heritage sites. Aspirating detectors are particularly effective in challenging conditions where traditional smoke detectors may be less reliable or too slow to respond.

Two models catering for most applications

The Velocity ASD range comprises two models; the VDOT-ASD-100 single zone detector designed to protect small areas and the VDOT-ASD-400 4 zone detector for larger areas.

VDOT-ASD-100: single zone ASD

• Single pipe configuration with coverage up to 1,000m²
• Multiple pipe network options (single pipe or 2/4 branches)
• Four alarm levels with adjustable time delays (Alert, Action, Fire-1, Fire-2)
• 7 configurable relay outputs (2A@30 VDC)
• Compact design

VDOT-ASD-400: 4-zone ASD

• Four-pipe system with coverage up to 2,000m²
• Enhanced pipe network options with optimised pipe length of 4x100m (4×18 holes)
• Optional zone relay board with 16 additional configurable relays

Intelligent features across the range

Both models incorporate the following advanced features;

• 24/7/365 Environmental Learning: Continuous smoke background level learning ensures accurate detection while minimising false alarms
• Comprehensive Flow Monitoring: Heat mass detection technology normalises pipe flow to 100% with adjustable sensitivity and high/low fault detection
• 3-in-1 Front Panel Display: Intuitive control interface with reset, isolate, silence, and test functions
• Advanced Visual Indicators: 20-segment smoke level indicator and 6-digit numerical LED display showing real-time smoke and airflow levels
• Network Capabilities: RS-485 network supporting up to 250 devices with built-in repeaters and compatibility with Modbus RTU open protocol
• Versatile Operating Conditions: Functions in ambient temperatures from 0-40°C and can sample air from -20 to 60°C with humidity range of 10-95% RH

Comprehensive design support service

Velocity offers a comprehensive design support service to help engineer the perfect aspiration solution to meet project requirements. This service includes expert pipe network design and precise flow calculations. These tailored reports help verify the suitability of the system and longterm optimum operation.

Certification & approval

The VDOT-ASD series has received FM Approval attesting that these products meet the highest industry standards for performance and reliability.

“Our Velocity ASD range represents the pinnacle of early fire detection technology,” said Jonathan Summers, Global Sales Manager at Velocity Detection. “The ability to detect smoke particles during the incipient stage of any fire where smoke particles are not even visible to the naked eye is invaluable. The earliest possible stage of detection provides the critical time to investigate and respond to an event before it escalates, saving property, valuable stock and ultimately human lives.”

For more information or to request a product demonstration visit Velocity Detection.

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Delivered by FITA’s expert instructor Peter Bell, the training offered the EAL Level 3 Award in the Requirements of Fire Detection and Alarm Systems for Buildings to BS 5839-1. This Ofqual-regulated award is not only a benchmark of competence but is also recognised under the BAFE SP203-1 Accreditation Scheme—making it an invaluable step forward for anyone serious about their role in fire safety.

We are long standing supporters of FITA and their excellent facility in nearby Caerphilly so this collaboration was a welcome opportunity. Zeta Alarms Director Lydia commented on the success of the event;

“We were proud to host this vital training course in collaboration with FITA. At Zeta Alarms, we’re passionate about raising standards in fire safety and ensuring that professionals across the industry have access to the very best education and resources. The enthusiasm and dedication of the attendees was inspiring, and we look forward to supporting more initiatives like this in the future.”

Participants were impressed by the depth and clarity of the instruction, as well as the training environment we’ve created. The facility proved to be the ideal backdrop and reinforced our position as a leading manufacturer in the fire sector.

A huge congratulations to everyone who completed the training and a heartfelt thanks to FITA making this happen. Here’s to continuing the momentum and raising fire safety standards even higher!

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Below are a selection of photos taken of our Partner Secure Vision’s stand at the ITCN Fire & Security Show in Karachi back in September 2017.

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The Zeta Beam Xtra has been re-engineered with revised optics whilst still benefiting from all of the features our customers loved about the original product. These include the low level controller (allowing commission & maintenance from ground level), auto-alignment with it’s motorised head and integration with our MKII addressable loops (required SMM/B mini module).

With the ever increasing pressure for our partners to supply world class solutions which meet cost expectations this extended range will simply mean less beams are required. Naturally this reduces both supply & installations costs.

The Zeta Beam Xtra is supplied in much the same format as its predecessor via the following 3 parts;

• ZT-BEAM/XTRA – Zeta Beam Xtra detector & reflector kit, range 7m to 70m
• ZT-BEAM/KIT140 – Extender kit for beam 70m – 140m
• ZT-BEAM/KIT160 – Extender kit for beam 140 to 160m

Contact your Premier Partner now for more information.

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