The smallest leak can lead to the accumulation of combustible gases, which can result in a dangerous explosion. A small spark, a burning cigarette, or another source can create a disastrous chain of events leading to the loss of life and property.
Over 500 gases can be monitored with GfG transmitters (see gas tables). The gases are divided into three groups: EX, OX, and TOX.
All combustible and explosive gases are combined under the term "EX." The LEL range (Lower Explosion Limit) is measured in ppm.
"OX" stands for oxygen. Detection normally serves to monitor the air we breathe, and is measured in % volume (the oxygen in air = 20.9% volume).
"TOX" describes all poisonous (toxic) gases. These gases are generally monitored for personal protection; for example, monitoring the TLV (Threshold Limit Value). The range is measured in ppm.