In some embodiments, a Wheatstone bridge device and sensor array wrappings are provided herein. The Wheatstone bridge device comprises a first resistor positioned proximate to a surface of the substrate and comprising a conductive composition. The conductive composition comprises fully exfoliated single sheets of graphene and a polymer. The first resistor is configured to undergo a conductivity change as a result of binding to a target component. The fully exfoliated single sheets of graphene display no signature corresponding to graphite or graphite oxide in their X-ray diffraction pattern.

The present disclosure relates to a water detection device that includes a water-activated battery configured to supply an electrical voltage upon contact with water, an electronic circuit configured to receive the electrical voltage from the water-activated battery, where the electronic circuit is configured to communicate with an external, electronic device upon receipt of the electrical voltage, and a housing configured to receive the water-activated battery and the electronic circuit, where the housing has passageways configured to facilitate movement of water into the housing and toward the battery.

The present disclosure relates to a water detection device that includes a water-activated battery configured to supply an electrical voltage upon contact with water, a device housing configured to receive the water-activated battery and one or more first electronic components, where the device housing has a plurality of ports that are configured to facilitate insertion and removal of the one or more first electronic components, and a modular housing disposed in a first port of the plurality of ports of the device housing, where the modular housing has one or more second electronic components communicatively coupled to the water-activated battery via the first port, such that the water-activated battery supplies the electrical voltage to the one or more second electronic components upon contact with water.

A leak detection system including a sensor having a first condition when dry and a second condition when wet; a communication device operatively coupled to the sensor; and an attachment element adapted to attach the leak detection system to an area for monitoring fluid leakage, wherein the attachment element is removable, reusable, or both.

A system for detecting water damage to a structure may include a plurality of energy-harvesting sensors on or within the structure, each sensor being configured to (i) generate sensor data indicative of one or more characteristics of air, construction materials, and/or water within the structure and (ii) generate power for operating the sensor responsively to an external stimulus other than an electrical power source. One or more processors of the system receive sensor data generated by the energy-harvesting sensors, detecting water damage to the structure by analyzing at least the sensor data, and cause an indication of the detected water damage to be presented to a user.

A liquid intrusion detection system includes a controller board, an absorbent material, first electrical contacts, and at least one processor. The controller board is disposed within a housing of an electric power steering unit. The absorbent material is at least partially disposed about a component. The first electrical contacts have first ends disposed on at least one of the controller board and the absorbent material. The at least one processor in communication with the first electrical contacts.

A temperature monitoring apparatus includes a temperature sensor and a control circuit. The temperature sensor detects a temperature of a piping system, such as a temperature of water in the piping system. The control circuit includes one or more processors and a memory storing instructions that, when executed by the one or more processors, cause the control circuit to determine whether water in the piping system is expected to freeze based on the indication of the temperature, predict whether a valve tripping event is expected to occur based on determining that the water in the piping system is expected to freeze, and in response to predicting that the valve tripping event is expected to occur, provide a prediction that the valve tripping event is expected to occur for remedial action.

Disclosed is a aqueous solution leak detection cable that locates aqueous solution leaks in pipelines, tanks, and other devices that store and transport aqueous solutions. Resistive sensor wires are used so that the location of the leak can be detected with a high degree of accuracy in an inexpensive and convenient matter. In addition, aqueous solution leaks can be detected over long distances, which reduces the cost and provides reliability for detecting aqueous solution leaks in aqueous solution pipelines.

Disclosed is a hydrocarbon leak detection cable that locates hydrocarbon leaks in oil pipelines, gas pipelines, oil and gas tanks, and other devices that store and transport hydrocarbons. Resistive sensor wires are used so that the location of the leak can be detected with a high degree of accuracy in an inexpensive and convenient matter. In addition, hydrocarbon leaks can be detected over long distances, which reduces the cost and provides reliability for detecting hydrocarbon leaks in hydrocarbon pipelines.

A tester that can be quickly and easily connected and/or disconnected to a device is described. The tester can check for leaks in the device. The tester can provide a conduit for fluid to flow to the device and a flow meter reading can demonstrate that the device has leakage or no leakage.