Ballast water treatment monitoring system
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.
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; 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;
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; and
a 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.