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A system for withdrawing samples of fluids comprises a pitot tube assembly, a flow sensor to measure a flow rate of the sample, and a pump connected to the pitot tube assembly to withdraw a sample, wherein the system is configured to match a sample flow velocity to the flow velocity sensed by a flow

A system for withdrawing samples of fluids comprises a pitot tube assembly, a flow sensor to measure a flow rate of the sample, and a pump connected to the pitot tube assembly to withdraw a sample, wherein the system is configured to match a sample flow velocity to the flow velocity sensed by a flow sensor on a pitot wand. The pitot tube assembly comprises a housing with a sample outlet and a return sample inlet, an extendable/retractable pitot wand within the housing, wherein the pitot wand includes a passage extending the length thereof to transfer a sample from a pitot tube end to a sealed compartment in the housing connected to the sample outlet; wherein the return sample inlet is connected to a passage in the housing leading to an outlet from the housing, and a flow sensor on an end of the pitot wand.

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1. A system for withdrawing samples of water and other fluids, comprising: a pitot tube assembly, comprising: a housing with a sample outlet and a return sample inlet;an extendable/retractable pitot wand within the housing, wherein the pitot wand includes a passage extending the length thereof to tr

1. A system for withdrawing samples of water and other fluids, comprising: a pitot tube assembly, comprising: a housing with a sample outlet and a return sample inlet;an extendable/retractable pitot wand within the housing, wherein the pitot wand includes a passage extending the length thereof to transfer a sample from a pitot tube end to a sealed compartment in the housing connected to the sample outlet; whereinthe return sample inlet is connected to a passage in the housing leading to an outlet from the housing; anda flow sensor on an end of the pitot wand;a flow sensor on a sample ballast water line coming from the pitot tube, wherein the flow sensor is configured to measure a flow rate of the sample; anda pump connected to the pitot tube assembly to withdraw a sample from the pitot wand, wherein the system is configured to match a sample flow velocity to the flow velocity sensed by the flow sensor on the pitot wand. 2. The system of claim 1, further comprising a pitot tube placed perpendicular to the pitot wand on the end thereof. 3. The system of claim 1, further comprising a processor to control a pump speed to control the sample flow rate. 4. The system of claim 1, further comprising a processor and one or more control valves to control the sample flow rate. 5. The system of claim 1, wherein the assembly includes one or more seals between the wand and the housing to separate the sample from the return sample. 6. The system of claim 1, further comprising a second pump on a branch line branching from the sample ballast water line, wherein the second pump pumps a sample for testing.