Types of Gases

Over 500 gases can be monitored with GfG transmitters (see gas tables). The gases are divided into three groups: EX, OX, and TOX.

EX

All combustible and explosive gases are combined under the term "EX." The LEL range (Lower Explosion Limit) is measured in ppm.

OX

    ”OX” stands for oxygen. Detection normally serves to monitor the air we breathe, and is measured in % volume range (the oxygen in air = 20.9% volume).

    TOX

    "TOX" describes all poisonous (toxic) gases. These gases are generally monitored for personal protection; for example, monitoring the TLV (TLV = Threshold Limit Value). The range is measured in ppm.