Proportional fluid sampling device

An apparatus for obtaining from a flowing stream of fluid material, a sample of said fluid material having a volume that is proportional to the flow rate, said apparatus comprising:

• a. intake means for withdrawing fluid material from a stream of fluid material and passing said fluid to a sampling reservoir;
• b. a sampling reservoir comprising a chamber;
• c. an upper conduit inlet at the top of said sampling reservoir and a lower conduit outlet at the bottom of said sampling reservoir;
• d. a drain conduit connected to the said lower conduit outlet of said sampling reservoir, said conduit being extended in a first downward direction and in a second upward direction to form a first hydraulic seal means said lower conduit having outlet means for withdrawal of fluid from said sampling reservoir;
• e. an equalizer chamber in open communication with said first hydraulic seal means at the same level as said conduit outlet;
• f. a gas bubbling system in open communication with a conduit means at the top of said equalizer chamber and bubbling gas at the open end of another conduit that is submerged in said stream for measuring the variation in the depth in said stream;
• and
• g. an outlet means at the bottom of said equalizer chamber below the level at which said first hydraulic seal means is in open communication with said equalizer chamber, said outlet means being connected to an equalizer chamber drain that extends in a first downward direction and in a second upward direction to form a second hydraulic seal means that is connected to a discharge line.