GfG GMA 40B Series

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Gas Monitoring Controllers
· Single or four channel controller · Easy mounting on DIN-rail · Multiple alarm points with relays
Gas Monitoring Controllers The GMA 41 one-channel controller and the GMA 44 4-channel controller are an integral part of safe and reliable gas warning systems.
Alarm points Every alarm can be adjusted separately. False alarms are eliminated with the adjustable alarm delay. The point values can be freely adjusted within the detection range. They can also be adjusted later with the control keys to adapt to changing requirements. Every point value can be selected to be latching / non-latching or resettable / non-resettable.
Alarm relaysEvery controller provides four voltage-free relays for the three alarms and the fault warning. The relays may be used to control external alarm devices like lights or horns. They can even introduce specific counter measures to prevent or limit dangers from gases or vapors.
Additional features The GMA 41 and GMA 44 store minimum or peak values, depending on the type of gas being detected. Even immediately following an alarm, gas dangers can be accurately detected. The GMA (variant B) offers an integrated BUS-system. The BUS-system supplies power from one source to all connected GMAs. The BUS-system also connects individual controller alarms together so that, with the use of the key-operated switch, all connected monitors have one collective alarm. Several GMAs can be connected easily without additional wiring.

Gases Depending on transmitter: Combustible / explosive Toxic gases and vapors Oxygen	Alarms 3 alarm points Freely adjustable within the detection range
Detection Range Depending on requirements: % LEL, volume %, ppm, mg/m³	Relay Outputs 4 voltage-free relays for alarm and fault Normally closed contact (NC) Normally open contact (NO)
Temperature Range 32 to +131°F (0 to +55°C)	Display 3-digit LED display 1 LED green – operational status 1 LED yellow – fault 3 LEDs red – alarm Display of maximum / minimum values
Response Time T₉₀ less than 3 seconds
Power Source 24 VDC	Function Keys Push-button operation for all functions, like alarm points, calibration, function test, and relay test
Power Consumption Maximum 150 mA at 24 V DC	Models GMA 41B / GMA 44B Power supply 24 V with bus-system
Input Signal 0.2 to 1 mA or 4 to 20 mA	Key-Operated Switch GMA 41 / GMA 44 SW (24 V)
Output Signal Linear 4 to 20 mA (GMA 41)	Power Supply Module Available on request
Alarm Functions Exceeding / desending Latching / non-latching Re-settable / non-resettable Hysteresis adjustable Delay-time 0 to 2 minutes Alarm thresholds completely adjustable	Dimensions 3.6x4.24x2.32 inches (90x106x58 mm) (HxWxD