A gas detector includes metal-oxide semiconductor gas sensors and their driving circuit. The gas detector stores the ratio of initial gas sensor resistance in air and that in an atmosphere including Freon gas, for the gas sensors. The gas detector learns sensor resistance in air for a gas sensor in use and detects Freon gas by comparing the sensor resistance of the gas sensor in use with the learned resistance in air divided by the ratio. When the first gas sensor has been used for a predetermined period, both the first gas sensor and a second gas sensor are used for a learning period to continue detection of Freon by the first gas sensor and to learn the resistance in air of the second gas sensor. After completion of the learning period, Freon is detected by the second gas sensor.

A pump cassette is disclosed. The pump cassette includes a housing having at least one fluid inlet line and at least one fluid outlet line. The cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pressure pump pumps a fluid from the fluid inlet line to the fluid outlet line. A hollow spike is also included on the housing as well as at least one metering pump. The metering pump is fluidly connected to the hollow spike on the housing and to a metering pump fluid line. The metering pump fluid line is fluidly connected to the fluid outlet line.

A refrigerant sensor assembly having a body including an outer surface. A recessed portion may be included on or formed in the body. The recessed portion may include the outer surface. The recessed portion may have a curved, generally convex shape having an upwardly facing open end and a lowest portion or bottom opposite the upwardly facing open end. A sensor suitable for detecting the presence of a refrigerant (e.g., a lower GWP refrigerant and/or an A2L refrigerant) and/or certain specified chemical compounds (e.g., hydrofluorocarbons) (e.g., a refrigerant sensor) may be disposed at the bottom of the recessed portion. Alternatively an enclosed collection space may be located beneath the recessed portion. An aperture or opening may be formed through the recessed portion and may adjoin the recessed portion with the collection space. A refrigerant sensor alternatively may be disposed in the collection space.

A water heater includes a tank assembly that defines an insulation cavity between an inner storage tank and an outer jacket. The water heater includes a bottom pad that supports the tank assembly thereon. The bottom pad is disposed in a bottom pan. Gaskets are disposed between the bottom pad and the bottom pan of the water heater. The bottom pad and at least one of the gaskets include apertures that are configured to internally route a leak sensor assembly of the water heater from the bottom pan to a controller of the water heater through the insulation cavity while preventing a leak of insulation material from the insulation cavity to the bottom pan. The water heater also includes a mounting bracket that is coupled to the inner storage tank to securely hold and route a portion of the leak sensor assembly disposed in the insulation cavity to the controller.

This disclosure is related to devices, systems, and techniques for outputting an alarm signal in response to detecting a leak in a water heater device. For example, a water heater device includes a leak sensor, an intermittent pilot light, and a circuit. The circuit includes processing circuitry configured to receive, from the leak sensor, an electrical signal including information indicative of a leak in the water heater device, activate, based on the electrical signal including information indicative of the leak, an alarm device, where the alarm device is powered for at least a period of time by a power source, where the power source is configured to receive energy from a thermoelectric device, and maintain an amount of energy stored by the power source so that the amount of energy is sufficient for the power source to supply energy to the alarm device.

A plate heat exchanger includes a heat exchanger plate having a heat transfer area and an edge area, extending around the heat transfer area. The heat exchanger plate is a double wall plate formed by two adjoining plates compressed to be in contact with each other. A sensor configured to sense at least one parameter and to produce a signal depending on the parameter includes a sensor probe that is provided between the adjoining plates.

An electrified vehicle powered by a traction battery includes a coolant loop arranged to convey coolant through at least a radiator, a chiller, and the traction battery to transfer heat from the battery. The vehicle also includes a refrigerant loop in fluid communication with the chiller to selectively circulate refrigerant through the chiller to provide supplemental heat transfer from coolant conveyed through the chiller. The vehicle further includes a vision system having at least one camera with a field of view including a vicinity of the radiator and a controller programmed to detect a radiator coolant leak based on image data output from the vision system. The controller is also programmed to cause a bypass of the radiator within the coolant loop to stop conveyance of coolant through the radiator in response to detecting a coolant leak.

A water heater includes a tank assembly that defines an insulation cavity between an inner storage tank and an outer jacket. The water heater includes a bottom pad that supports the tank assembly thereon. The bottom pad is disposed in a bottom pan. Gaskets are disposed between the bottom pad and the bottom pan of the water heater. The bottom pad and at least one of the gaskets include apertures that are configured to internally route a leak sensor assembly of the water heater from the bottom pan to a controller of the water heater through the insulation cavity while preventing a leak of insulation material from the insulation cavity to the bottom pan. The water heater also includes a mounting bracket that is coupled to the inner storage tank to securely hold and route a portion of the leak sensor assembly disposed in the insulation cavity to the controller.

Described are fluid pumping and fluid handling systems, which may be suitable for use in medical devices, such as artificial or extracorporeal blood pumping systems. The systems can include a dual housing configuration for pneumatic actuation comprising a main housing containing a pump cassette comprising a pneumatically actuated pump and pneumatically actuated valves. The pump can include a pump actuation chamber and pump pneumatic port, and the valves can each include a valve actuation chamber and valve pneumatic port. Connecting tubes can be used to fluidly connect the pump actuation ports and valve actuation ports to a tube-support housing having a first side receiving one end of each connecting tube and a second side providing a pneumatic interface arranged to connect to an array of pneumatic receptacles on a base unit of the system to facilitate easy, compact and accurate pneumatic interconnection between the pump cassette and the base unit.

A liquid cooling device includes a liquid cooling conductor, a detecting probe, and a determining circuit. The liquid cooling conductor includes a chamber defined therein for communicating with the outside, the chamber is configured to accommodate the coolant, and the surface of the liquid cooling conductor is provided with at least one communicating port communicating with the chamber; wherein the liquid cooling conductor is formed joining at least two combination blocks, and at least one of the two combination blocks is a metal conductor. The detecting probe is disposed on the liquid cooling conductor and normally electrically disconnected from the metal conductor. The determining circuit is electrically connected to the metal conductor and the detecting probe, and generates a liquid leakage alarm signal when the metal conductor and the detecting probe are electrically connected.