GfG GMA 300

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Gas Monitoring System
· Intelligent and flexible · Gas monitoring and warning system · 1 to 4 sensor controller · Function tested by DMT-IBS/PFG
GMA 300 - The Fixed Gas Monitoring Systems - Technical Information - GfG Instrumentation, Inc. stationary gas monitors consist of a remote sensor and a control module—the GMA 300. The remote sensor converts the gas concentration to an electrical signal and sends it via cable to the GMA 300 controller. The trans-mission distance may extend to several hundred feet. The GMA 300 digitizes the sensor signals and passes the values on to its micro-processor, which linearizes the signals.
The digital signal processing allows unparalleled flexibility in the monitoring system. The GMA 300 can filter measurement signals, suppress zero point deviations, delay or accelerate alarms or, by recognizing certain trends, activate an alarm even before a dangerous gas concentration is reached. Three variably adjustable alarm thresholds can be set, which may be latching or self-resetting. You can activate or alter functions and calculation parameters, to adapt the complete monitoring system to specific measurement tasks. A service key prevents unauthorized access to the program. Zero point and span adjustment can be checked and corrected on the front keyboard, thus simplifying service efforts and saving maintenance costs considerably.
The GMA 300 provides four potential-free relay outputs for alarm and failure. They can be used for turning on alarm horns or lamps, or for stopping production processes (e.g. closing valves or switching off current). The relays can be operated as either normally closed (NC) or normally open (NO) contacts. The measurement values are available as an analog output signal of 0–10 V and 4–20 mA. The correct unamplified sensor signal (0–1 V) and the standard signal (0–10 V) can be verified without opening the unit. Four logical outputs allow the activation of collective gas or failure alarms. Measurement data, alarms and service data are all available from the GMA 300's CAN-Bus digital interface. The data can be sent to any computer for processing by the specially developed GfG Instrumentation recording and documentation software.
Control your own safety There is an increasing demand for personal and environmental protection—resulting in the demand for ever more reliable gas monitoring equipment. Even very low gas concentrations may cause hazardous situations. It is an absolute must for a gas monitor to react reliably and immediately. The GMA 300 combines state-of-the-art technology and GfG Instrumentation, Inc.'s decades of experience in gas measurement. When developing the GMA 300, every detail was considered, from the design of communication connectors up to user-orientated software modules—your guarantee of easy updates to future system requirements.
GMA 300—A controller for all measurement tasksEvery GfG Instrumentation, Inc. remote sensor can be connected to the GMA 300. More than 100 different gases can be monitored. By means of its three adjustable alarm thresholds, the GMA 300 ensures reliable warning for gas hazards, whether caused by combustible or toxic gases, or by oxygen deficiency or enrichment. Corrective actions can always be taken in time.
Performance and unmatched versatilityTo date, no other gas monitoring system has achieved the flexibility of the GMA 300. The unit's touch keys and display menus make it easy to customize settings for your application. A coded service key protects the system from unauthorized access.
Alarm—set to your requirementsThe three alarm thresholds are variably adjustable throughout the entire detection range. DIP switches are used for individually programming the alarm functions (latching / non-latching, re settable / nonresettable and exceeding or falling below set point). A rise-delay time and a fall-delay time on alarm points can be set from 1 second up to 100 minutes. Since every second counts in explosive atmospheres, sudden changes of the gas concentration are recognized by the GMA 300's "Delta-Alarms" even before reaching the pre-set thresholds
Delta alarm — time lead over gas hazardsWith a sudden outbreak of combustible gases, every second counts to prevent damage. The "Delta Alarm" of the GMA 300 gives you the decisive lead. The intelligent GMA 300 immediately recognizes an extraordinarily rapid increase in gas concentration and activates an alarm before a hazardous situation builds up. Three Delta Alarms are available in addition to the three standard alarm thresholds.
Control functionActivation and de-activation of alarms can be delayed for any time between one second and 100 minutes. Time delay relays and controllers are no longer necessary, since the GMA 300 serves as the central measurement and control unit, at no additional cost.
Analog…Four potential-free relays are available to control external warning devices (alarm lamps, sirens, etc.) or emergency shutdown of gas conduits or electrical current. Logical outputs can be used for collective alarms from a group of remote sensors. The measurement values are available as analog signals (0–10 V resp. 4–20 mA) for further processes. A collective alarm card can be plugged on the GMA 300 back panel to form group alarms in conjunction with other GMA 300 controllers.	…and digital outputsAll measurement data, alarms and function adjustments are available from a digital interface, the CAN-Bus. Data can be read by any computer, providing almost unlimited options for data storage and data processing. The special GfG software allows professional preparation and docu-mentation of measurement data. The values can be recorded as charts or graphs over extended periods, and data transfer to database and graphic programs is also possible.	All information at a glanceThe measurement values are displayed continuously, with trends being shown by the additional bar graph. LEDs clearly indicate alarm, operational mode and signals for every single detection point.
Monitor with adaptability and intelligenceGas monitoring in production plants requires an exceptionally flexible gas warning system. The GMA 300 control modules can exchange data between each other and a computer. This allows a combination of intelligent monitoring equipment adapted individually to your specific requirements. Additional connection of other sensors for temperature, pressure and different gases allows evaluation and data storage of these parameters as well. For safety, however, the GMA 300's alarm functions remain entirely isolated from its external data links, to maintain their integrity in case of computer failure.