Water detection system and method

• US 6,683,535 B1
• Filed: 08/09/2000
• Issued: 01/27/2004
• Est. Priority Date: 08/09/2000
• Status: Expired due to Fees

• Current Assignee: Alderon Industries LLC
• Original Assignee: Alderon Industries LLC
• Inventors: Utke, Gene H.
• Primary Examiner(s): PHAM, TOAN NGOC
• Application Number:
  US09/634,560
• Time in Patent Office: 1,266 Days
• Field of Search: 340/604, 340/605, 340/532, 340/533, 340/534, 340/620, 340/618, 137/312, 200/61.04, 324/664, 324/694, 73/11.6, 73/11.7, 73/13.1, 73/17.3, 73/40, 733/05, 733/07, 733/08, 733/13--24
• US Class Current: 340/604
• CPC Class Codes: G01M 3/045 with electrical detection means
• CPC Class Codes: G08B 21/20 responsive to moisture

Abstract

A water detection system for detecting water and activating an alarm is provided. The water detection system includes an alarm relay and a water sensor. The water sensor includes a solid state switching and amplifying circuit for detecting low levels of current flow and amplifying the signal to activate the alarm relay. In one embodiment, the water detection system further includes an alarm panel, including visual and audible alarms activated by the alarm relay. In one embodiment, the water detection system includes multiple water sensors for providing zone protection. In one embodiment, the alarm relay is configured to shut-down the device causing the presence of water. A method for implementation of the water detection system is also provided.

Claims

1. A system for detecting the presence of a conductive liquid, the system comprising:

an alarm housing, including a power source, an alarm, and a relay; and

a sensor housing, for detecting the liquid, having two probes and a switching and amplifying transistor, the sensor housing located remotely from the alarm housing;

wherein the switching and amplifying transistor is electrically coupled to the power source, the alarm, and the relay, so as to form an alarm circuit.

2. A system for detecting the presence of a conductive liquid in an operating environment, the system comprising:

a sensor housing including a first probe and a second probe coupled to an amplifying and switching transistor and first and second terminals located across the amplifying and switching transistor, the first probe and second probe configured to contact any of the conductive liquid present in the operating environment; and

an alarm housing, located remotely from the sensor housing, including an alarm relay for activating an alarm, the alarm relay electrically coupled to the first and second terminals of the sensor to form an alarm circuit.

3. The system of claim 2 wherein the liquid detected is water.

4. The system of claim 3 wherein the alarm housing is connected to a plurality of the sensor housings in parallel, such that detection of the water by any one of the sensor housings will close the alarm circuit and activate the alarm.

5. The system of claim 3 further comprising a float switch connected in parallel to the alarm circuit to detect a specified level of water and close the alarm circuit when that level is detected.

6. The system of claim 2 further comprising a power supply electrically coupled to the alarm housing for supplying power to the alarm circuit.

7. The system of claim 2 wherein the alarm located in the alarm housing is an audible alarm.

8. The system of claim 7 wherein the alarm circuit includes a silence relay that is actuated by a silence switch, the silence relay operating to remove the flow of power to the audible alarm and to latch itself on while power continues to flow through the amplifying and switching transistor.

9. The system of claim 2 wherein the alarm relay is actuated by flow of a sufficient current through the alarm relay, and further wherein actuation of the alarm relay closes a switch that activates the alarm.

10. The system of claim 9 wherein the al relay is configured to shut down an auxiliary device in the location of the water detection, upon the detection of water.

11. The system of claim 2 wherein the sensor housing is encapsulated in epoxy to prevent liquid entry, such that only the first probe and second probe are exposed.

12. The system of claim 2 wherein the amplifying and switching transistor includes an amplifying transistor and a switching transistor configured such that an emitter of the amplifying transistor is connected to the base of the switching transistor.

13. The system of claim 12 wherein the amplifying transistor is activated when the liquid is present across the first and second probes, which in turn activates the switching transistor which acts to connect the first and second terminals of the sensor housing.

14. The system of claim 2 wherein the amplifying and switching transistor is a Darlington transistor.

15. The system of claim 2 wherein the alarm housing supplies electrical power to the sensor housing.

16. A water detection circuit, powered by a power source, for detecting the presence of water, the water detection circuit comprising:

a relay coil adapted to be activated by the flow of a sufficient amount of current;

a first probe and a second probe configured to contact the water, the first and second probes forming a first switch connected in series with the power source and the relay coil; and

a second switch connected in series with the power source and the relay coil and connected in parallel with the first switch, the second switch including a switching transistor activated by an amplifying transistor coupled to its base, wherein the amplifying transistor is activated upon the presence of water between the first and second probes.

17. The water detection circuit of claim 16 further comprising an alarm coupled to the relay coil, the alarm activated upon activation of the relay coil.

18. The water detection circuit of claim 16 wherein the current flowing between the first and second probes, in the presence of the water, is less than one milliamp.

19. A method of detecting water at a remote location and signaling the detection, the method comprising the steps of:

positioning a sensor housing, including a first probe and a second probe for contacting the water, at a detection location, the sensor housing further including a switching and amplifying transistor having a first terminal and a second terminal; and

coupling the sensor housing to a second housing including an alarm, a relay, and a power source to form an alarm circuit, wherein the second housing is positioned at a remote location from the sensor housing.

20. The method of claim 19 further comprising the steps of:

connecting a base and a collector of an amplifying transistor, in the alarm circuit, to the first and second probes; and

connecting a collector and an emitter of a switching transistor to the first terminal and the second terminal.