Appliance leak detector and inline shutoff
First Claim
1. A system for detecting when a fluid is leaking from a machine or from one or more connecting hoses providing and removing the fluid from the machine, the system comprising:
- a leak sensor apparatus (10) having two conductors (10a–
b) held in spaced apart relation in a fluid-permeable insulating material (10c), responsive to an impressed voltage causing a voltage difference between the two conductors (10a–
b), for providing a leak detection current when fluid from the machine leaks through the fluid-permeable membrane (10c); and
a flow control device (16), for providing the impressed voltage, for stopping the flow of the fluid to the machine in response to the leak detection current;
wherein the leak sensor apparatus (10) also includes a leak sensor detection component (10d) completing a circuit path for an alternating or radiofrequency current of a higher frequency than the leak detection current, and wherein the flow control device (16) is configured to provide an impressed voltage corresponding to the higher-frequency current and to detect the higher-frequency current in order to determine if the leak sensor apparatus (10) is coupled to the flow control device (16).
2 Assignments
0 Petitions
Accused Products
Abstract
A leak sensor apparatus (10) and flow control equipment (16) for sensing a leak from a machine using a supply of water (or other fluid) or from connecting hoses supplying the water, and for turning off the supply when a leak is detected, with the leak sensor (10) itself including in particular two conductors (10a–b) held in spaced apart relation in a fluid-permeable insulating material (10c), and the flow control equipment (16) for providing a voltage difference between the two conductors (10a–b) and for sensing the presence of a fluid based on the fluid providing an electrical path between the two conductors (10a–b) and so allowing current to flow between the two conductors (10a–b) under the urging of the voltage difference provided by the flow control equipment (16). In some embodiments, the two conductors (10a–b) are configured so as to wrap about one or more of the connecting hoses.
23 Citations
32 Claims
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1. A system for detecting when a fluid is leaking from a machine or from one or more connecting hoses providing and removing the fluid from the machine, the system comprising:
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a leak sensor apparatus (10) having two conductors (10a–
b) held in spaced apart relation in a fluid-permeable insulating material (10c), responsive to an impressed voltage causing a voltage difference between the two conductors (10a–
b), for providing a leak detection current when fluid from the machine leaks through the fluid-permeable membrane (10c); anda flow control device (16), for providing the impressed voltage, for stopping the flow of the fluid to the machine in response to the leak detection current; wherein the leak sensor apparatus (10) also includes a leak sensor detection component (10d) completing a circuit path for an alternating or radiofrequency current of a higher frequency than the leak detection current, and wherein the flow control device (16) is configured to provide an impressed voltage corresponding to the higher-frequency current and to detect the higher-frequency current in order to determine if the leak sensor apparatus (10) is coupled to the flow control device (16). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A machine having a hose for receiving or discharging a fluid, characterized in that:
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electrical conductors (10a–
b) separated from each other by a fluid-permeable insulating material (10c) are arranged in fixed proximate relation to the hose or the machine, and adapted so as to be responsive to a first signal and to fluid leaking from the hose, and so as to provide a second signal to a flow control device (16) that determines whether there is a possible leak in the hose;wherein the machine also includes a leak sensor detection component (10d) completing a circuit path for an alternating or radiofrequency current of a higher frequency than the second signal, and wherein the flow control device (16) is configured to provide an impressed voltage corresponding to the higher-frequency signal and to detect the higher-frequency signal in order to determine if the electrical conductors (10a–
b) are coupled to the flow control device (16). - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A kit for adapting a machine having a hose for receiving or discharging a fluid, characterized in that the kit comprises:
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electrical conductors (10a–
b) separated from each other by a fluid-permeable insulating material (10c), for arranging in fixed proximate relation to the hose or the machine, and adapted to respond to a first signa arid to fluid leaking from the hose by providing a second signal;a flow control device (16), responsive to the second signal, for determining whether there is a possible leak in the hose; and a leak sensor detection component (10d) completing a circuit path for an alternating or raido frequency current of a higher frequency than the second signal, and wherein the flow control device (16) is configured to provide an impressed voltage corresponding to the higher-frequency signal and to detect the higher frequency signal in order to determine if the electrical conductors (10a–
b) are coupled to the flow control device (16).
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Specification