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For more than 60 years, GfG has been committed to protecting people, industrial facilities and the environment by developing and manufacturing gas detection systems. With an extensive range of portable gas detectors and fixed gas detection systems, GfG can supply you with a selection of products for many applications and industries. Our scope also includes on-site service and advanced training courses.


What distinguishes us from other manufacturers

We are specialists for gas detection solutions, not generalists in safety. No one can be the best at everything, but if you focus on one thing, you can achieve excellence. We work hard to provide you with the best gas detection equipment available, so you can focus on your task without having to worry about the risks that gases can pose. Because of that we invest more heavily in research and development than any other company. Approximately 13% of our annual turnover is reinvested in basic research and the development of new sensors and devices.


A “never say no” approach

This includes finding solutions for customers whose requirements are not met by “off the shelf” products. We take pride in our longstanding cooperation with the Singapore Civil Defence Force (SCDF), for example. For many years now, they have put their trust in GfG’s portable devices, which we optimized to adapt to the Singaporean climate and fulfill the special requirements for integration into the SCDF communication network.

Wherever gases are used or may be present in industrial and commercial applications, they must be monitored. A gas detection system consists of one or more transmitters, which use sensors to detect gases, and a controller, which has a wide range of tasks. The GMA200-MW16 controller is ideally suited for complex gas detection systems with up to 16 digital or analog transmitters. Safety measures can be connected directly to the GMA200-MW16 via internal relays. The current measured values, alarms and special states of the transmitters can be viewed directly on the display of the controller.

Fixed transmitters monitor combustible or toxic gases and vapors present in the ambient air as well as the oxygen concentration. A controller centrally displays the measured gas concentrations and processes the incoming signals. The GMA200-MW16 is the right choice if

  • gases are monitored with up to 16 digital or analog transmitters
  • safety measures are to be operated via the controller
  • the measured values are to be shown centrally on a display
  • an acoustic and visual alarm is required on site
  • operating status and alarms have to be indicated by status LEDs

Versatile application possibilities
The GMA200-MW16 controller and the connected transmitters form a fixed gas detection system for measuring toxic and flammable gases as well as oxygen concentration. Up to 16 digital transmitters can communicate with the controller via the RS-485 interface. Analog transmitters (up to 16) can be connected via 0.2-1 mA or 4-20 mA. The GMA200-MW16 is suitable for any GfG transmitter and any available gas type. This offers a large number of possible combinations of gases, measuring ranges, measuring points and Ex zones to be monitored simultaneously.  The robust housing (IP65) for wall mounting can be installed in almost any location. The supply voltage is 100-230 V AC or 24 V DC.

Internal relays and extensions
For the implementation of safety measures, 6 internal relays with one normally open contact each can be programmed individually. Two additional relays are available for fault messages and maintenance. If required by the application, the number of programmable relays can be increased up to 70 (6 internal and 64 external relays). The relay modules are connected via the GMA bus interface. GfG’s GMA200-RT and GMA200-RTD relay modules allow safety measures to be implemented in a decentralized manner, reducing the amount of cabling required.

Clear indicators for assessing the hazard situation
The GMA200-MW16 has a color backlit 2.2-inch display. The current measured values of the connected transmitters can be viewed on it at any time. In the event of an alarm, the background color changes from green to red. At the same time, LEDs indicate the alarm level and the relay switching states. A local alarm is triggered by an easily visible alarm light and a loud, integrated horn (100 dB(A)). Two inputs are available for external alarm acknowledgement push buttons.

Operation, visualization and data storage
The operation of the controller and the alarm acknowledgement on site are done intuitively via 5 pushbuttons. Configuration is possible via the mini-USB interface using a PC and the GMAConfig software. With the optional GMA200-VS software, all measured values and states of the connected transmitters can also be displayed decentrally on a PC or monitor. Equipped with a microSD card, the controller permanently stores measured values, average values, alarm events and faults at individually configurable intervals for evaluation.


Key features at a glance:

General information:

  • Suitable for every GfG transmitter
  • Monitors 1 to 16 measuring points


  • 8 integrated relays for safety concepts, fault messages and maintenance
  • 0.2-1 mA, 4-20 mA or RS-485 (Modbus)
  • Color backlit 2.2″ display
  • 15 colored status LEDs
  • Visual and audible alarm
  • Housing for wall mounting (IP65)


  • Data logger (microSD card)
  • Relay module for expansion (up to 4 modules with 16 relays each)
  • Visualization software
  • Uninterruptible power supply

Approvals / Certifications:

  • ATEX certification: II (2) G
  • SIL 2/3

Would you like to know more?

Our team can help you with any product information, quotes, or any general questions you may have about the product.

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