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2. Identity
The GA21 gas alarm detector is a device that detects explosive gases in the environment. 1.5 minutes
after the supply voltage is applied, the sensor warms up and reaches the normal detection level. It is not
recommended to test with any gas before this period expires. If the gas leakage level is above the set
limit value, the device gives an alarm. As long as the gas leakage is above the limit level, the device
continues to alarm. When the gas leakage falls below the set limit level, it automatically shuts down the
alarm and relays and cuts off the energy of the connected systems.
If the gas valve is to be closed or the gas to be evacuated from the environment under alarm conditions,
the desired system can be controlled by using the output relays of the gas alarm device. Analog output
signals in the device PLC etc. It can be controlled by connecting to systems such as By changing the
sensor head, different gases can be detected. It is a general-purpose, simple and easy-to-use device that
can output mA or volts, control the systems connected to the output relays, and give audible and visual
warnings.
Developed considering the needs of the user, the GA21 gas alarm detector has a structure that simplifies
and strengthens the communication between the user and the device. The device contains 2 output
control relays, 1 gas level output (mA and Volt), 1 buzzer (audio warning), Zero, Span and offset (%LEL
adjustment) trimpots and electronic board.
2.1. Description of the device
GA21 gas alarm detector is connected to the level signal output and connected to intelligent and
controllable systems (PLC etc.) (0-20, 4-20, 0-10, 2-10 mA, 0-5, 1-5, 0-10, 2 -10 VDC) sends analog
signals. It is a product that aims to warn the user with sound and light by controlling the gas level in the
environment, to send signals to the connected systems, to control, to use the systems it controls safely
and to prevent possible dangers.
2.2. Intended use of the device
• Long life
• Being ExProof
• Less energy consumption
• Modular design structure
• Easy assembly and disassembly
• Ease of adjustment and flexible operation
• Robust and lightweight construction
• Informing the user with the alarm
2.3. Reasons for use
