Non-invasive Thermal Dispersion Flow Meter with Chronometric Monitor for Fluid Leak Detection and Freeze Burst Prevention

摘要

A non-invasive thermal dispersion flow meter with chronometric monitor for fluid leak detection includes a heater, an ambient temperature sensor and a flow rate sensor which are configured to sense the temperature of a fluid in a conduit, and then monitor the flow of that fluid through the conduit. The fluid flow sensor is incorporated into a Wheatstone bridge circuit which is used to provide increased sensitivity to the outputs of the sensors. Based upon the ambient temperature sensor readings, the flow rate sensor and heater may be adjusted to optimize the operation of the system to detect leaks. An alternative embodiment utilizes a single sensor and separate heater which work together to determine heat propagation times which in turn is used to calculate flow rate. Based on the sensor readings, the flow may be adjusted to prevent damage and leaks by relieving the system of excess pressure.

主权项

1. A fluid leak detector for detecting leakage in a pressurized fluid system having a closed fluid conduit, the fluid leak detector comprising:
a first sensor in thermal communication with the outside of said conduit and capable of sensing the ambient temperature of the fluid within said conduit; a second sensor in thermal communication with the outside of said conduit and responsive to a drive signal to elevate the temperature of said second sensor; a means for generating a drive signal in communication with said second sensor to drive said second sensor to a temperature above the ambient temperature; and a means for detecting the flow of fluid through said conduit.