Applications & User Benefits Wet-test (drum-type) gas flow meters are used universally to
measure and record gas volume and gas flow rate for many industrial, petroleum and chemical processes;
environmental; pilot plant or test; controlled chamber; laboratory
and research applications. Wet-test meters consistently provide the highest accuracy and
precision even at the lowest gas flows with inert or the most
aggressive gases. Measurement Principle Wet-test gas meters function upon the principle of positive
displacement. The sample gas stream rotates a measuring drum within
a packing fluid, usually water or low viscous "white" (clear) oil.
A needle-dial and counting mechanism, coupled to the rotating drum,
records the volume of gas flow as it sequentially fills and empties
from the drum's rigid, fixed volume measuring chambers.