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The GfG GMA200-MW4 controller is a high-performance, multi-channel control unit designed to manage larger fixed gas detection systems across a wide range of applications.

Capable of monitoring up to 16 transmitters (including up to 4 analog devices), the GMA200-MW4 provides a scalable solution for sites requiring broader coverage or multiple gas types.

Built for Larger, More Complex Systems
Where smaller controllers reach their limits, the GMA200-MW4 excels—making it ideal for:

• Large underground or multi-level car parks
• Hospitals and critical infrastructure
• Industrial plants and processing facilities
• Refrigeration and cold storage systems
• Utilities, energy centres, and laboratories

With support for both digital (RS-485) and analog (4–20 mA / 0.2–1 mA) transmitters, it allows flexible system design across mixed technologies.

Scalable Monitoring – Up to 16 Transmitters
The GMA200-MW4 can manage:

• Up to 16 digital gas transmitters via RS-485
• Up to 4 analog transmitters simultaneously
• Multiple gas types including toxic, combustible, refrigerant gases and oxygen

This enables a single controller to oversee entire plant areas or large car park zones, reducing system complexity and hardware duplication.

Advanced Control & Safety Automation
The controller is designed not just to monitor—but to actively control safety systems:

• 6 integrated relays for alarms, ventilation, shutdowns, and fault signals
• Expandable to up to 68 relays using external modules
• Configurable alarm logic (multiple thresholds, grouped alarms, voting logic)

This allows direct control of:

• Car park ventilation systems (CO / NO₂ control)
• HVAC safety shutdowns
• Refrigeration plant alarms
• Process safety interlocks

Centralised Visibility & Alarm Management

• 2.2” colour display showing all connected gas readings
• Colour-coded status (green = normal, red = alarm)
• Multiple LED indicators for alarm levels and relay states
• Integrated audible alarm (up to ~100 dB) for local warning

Operators can instantly assess system status and respond quickly to hazardous conditions.

Designed for Integration & Networking
The GMA200-MW4 is built for modern systems and connectivity:

• RS-485 (Modbus RTU) for BMS, PLC, and SCADA integration
• Multiple bus interfaces for transmitters and relay modules
• PC connectivity for configuration and system monitoring
• Optional visualisation software for multi-controller systems

This enables full system visibility across single or multi-site installations.

Data Logging & System Intelligence
For compliance, diagnostics, and optimisation:

• Optional microSD data logging
• Records gas levels, alarms, faults, and trends
• Configurable logging intervals
• Supports reporting and analysis for safety audits

Robust Design for Demanding Environments

• IP65-rated wall-mounted enclosure
• Suitable for plant rooms, control rooms, and industrial spaces
• Wide power supply options (100–230V AC or 24V DC)
• Designed for continuous operation in critical systems

Key Features

• Scalable control of up to 16 gas transmitters
• Supports both digital and analog inputs
• Centralised monitoring of toxic, combustible gases and oxygen
• 6 onboard relays, expandable up to 68
• Advanced alarm logic and system control capability
• BMS/PLC integration via Modbus RS-485
• Colour display with LEDs and audible alarm
• Optional data logging (microSD)
• Robust IP65 enclosure for industrial environments

Typical Applications

Car Parks & Ventilation Systems

• Large basement and multi-level car parks
• CO / NO₂ demand-controlled ventilation systems

Building Services

• HVAC plant rooms and central energy plants
• Hospitals and critical infrastructure

Industrial & Refrigeration

• Cold storage and ammonia refrigeration systems
• Manufacturing and processing plants
• Utilities and wastewater treatment

 

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