Flammable gases burn or explode after ignition if the right concentration is present in air or oxygen. On the one hand, sufficient oxygen must be present, and on the other, a flammable substance, which can be combustible gases such as propane, methane, hydrogen, Natural gas, etc., must be present. The risk of fire increases as the proportion of combustible gas increases. If the proportion of combustible gas is too high (upper explosion limit), the probability of ignition decreases again. Beware of leaking containers or pipework and escaping Gases.

The VA 550 and VA 570 with ATEX approval ATEX II 2 G Ex db IIC T4 Gb (gas) or ATEX II 2 D Ex tb IIIC T90 °C Db (dust) can be used to measure the consumption and flow of explosive and flammable gases.