Patent ID: 7854894

Claim:
A method of liquid sampling with the feed pump and feed line the method comprising: extending the feed line from a liquid sample inlet to a sample analysis device, the feed line having an inner diameter of less than 10 mm; with the feed pump disposed in a waste water drip tank that serves as a source of liquid samples, pumping the liquid samples through the feed line in feed pulses which expand a volume of the feed line by less than 50% of a volume of the feed pulse; wherein the liquid sample is pumped in a liquid state through the feed line; wherein liquid samples tend to deposit films on an interior surface of the feed line; wherein during feed pulses, the liquid samples reach velocities of at least 0.5 m/s and the feed line is a plurality of meters in length; and further including maintaining the feed velocity during at least a peak of each feed pulse such that the feed velocity of the sample liquid during the peak of the feed pulse removes film from the interior surface of the feed line reducing cleaning and maintenance of the feed line.