Abstract: The present invention provides a pressure gauge for measuring a pressure of a source. The pressure gauge includes a case, a flexible film, a magnetic device, a coil, a processor, and a screen. The case has a bore connecting the source. The coil is provided in the case. The flexible film is provided on an inner side of the case to cover the bore that the flexible film is expandable by the pressure of the source. The magnetic device is received in the case to be moved relative to the coil by the flexible film. The movement of the magnetic device causes the coil to generate an induced electromotive force, and the processor may find the gas pressure according to the induced electromotive force, and show it on the screen.

Abstract: The present invention provides a method of detecting water heater safety, wherein the water heater includes a blower and a combustor. The method includes starting the blower and detecting blower speed after a certain amount of time; comparing the blower speed with a first speed range, and then supplying gas to the combustor when the speed of the blower is within the first speed range, or providing an alarm when the blower speed is beyond the first speed range; detecting the speed of the blower again after the combustor heats water for a time; comparing blower speed with a second first speed range, and then supplying gas to the combustor when the blower speed is within the second speed range, or stopping gas when the blower speed is beyond the second speed range.

Abstract: The present invention provides a pressure detecting circuit, which is electrically connected to a coil to receive an induced electromotive force from the coil, including a movement detecting unit electrically connected to the coil to receive the induced electromotive force from the coil and find a distance of the movement of the magnetic device according to the induced electromotive force; and a converting unit electrically connected to the movement detecting unit to generate the voltage signal to indicate the distance. In addition, the present invention further provides a pressure gauge incorporated with the pressure detecting circuit.

Abstract: The present invention provides a water heater, including a combustor, a gas pipe, a combustion controller, a pressure gauge, and a controller. The gas pipe supplies the combustor gas. The combustion controller controls combustion of the combustor. The pressure gauge detects a gas pressure in the gas pipe and generates an electrical signal in association with the gas pressure. The controller is electrically connected to the gas gauge and the combustion controller to receive the electrical signal from the gas gauge and controls the combustion controller according to the electrical signal to adjust the combustion of the combustor. In addition, the present invention further provides a method of controlling the water heater.

Abstract: The present invention provides a pressure gauge for measuring a pressure of a source. The pressure gauge includes a case, a flexible film, a magnetic device, a coil, a processor, and a screen. The case has a bore connecting the source. The coil is provided in the case. The flexible film is provided on an inner side of the case to cover the bore that the flexible film is expandable by the pressure of the source. The magnetic device is received in the case to be moved relative to the coil by the flexible film. The movement of the magnetic device causes the coil to generate an induced electromotive force, and the processor may find the gas pressure according to the induced electromotive force, and show it on the screen.

Abstract: The present invention provides a method of detecting water heater safety, wherein the water heater includes a blower and a combustor. The method includes starting the blower and detecting blower speed after a certain amount of time; comparing the blower speed with a first speed range, and then supplying gas to the combustor when the speed of the blower is within the first speed range, or providing an alarm when the blower speed is beyond the first speed range; detecting the speed of the blower again after the combustor heats water for a time; comparing blower speed with a second first speed range, and then supplying gas to the combustor when the blower speed is within the second speed range, or stopping gas when the blower speed is beyond the second speed range.

Abstract: The present invention provides a water heater, including a combustor, a gas pipe, a combustion controller, a pressure gauge, and a controller. The gas pipe supplies the combustor gas. The combustion controller controls combustion of the combustor. The pressure gauge detects a gas pressure in the gas pipe and generates an electrical signal in association with the gas pressure. The controller is electrically connected to the gas gauge and the combustion controller to receive the electrical signal from the gas gauge and controls the combustion controller according to the electrical signal to adjust the combustion of the combustor. In addition, the present invention further provides a method of controlling the water heater.

Abstract: The present invention provides a pressure detecting circuit, which is electrically connected to a coil to receive an induced electromotive force from the coil, including a movement detecting unit electrically connected to the coil to receive the induced electromotive force from the coil and find a distance of the movement of the magnetic device according to the induced electromotive force; and a converting unit electrically connected to the movement detecting unit to generate the voltage signal to indicate the distance. In addition, the present invention further provides a pressure gauge incorporated with the pressure detecting circuit.

Abstract: An inductor induced light emitting bottle comprises a seat having a transformer therein; the transformer being connected to a power source for voltage reduction. A transparent bottle serves for receiving water. A first coil is made of copper wire. The first coil encloses a periphery of the transparent bottle. One end of the first coil passes through the though hole to be connected to a lower voltage output end of the transformer. A light emitting unit has a hollow transparent casing, a second coil, a LED lamp, a sealing cover. A diameter of the second coil is smaller than that of the first coil. The LED lamp is connected to two ends of the second coil. The light emitting unit is disposed in the transparent bottle so that the second coil of the light emitting unit is disposed in the first coil as a transformer when they are conducted.

Abstract: An inductor induced light emitting bottle comprises a seat having a transformer therein; the transformer being connected to a power source for voltage reduction. A transparent bottle serves for receiving water. A first coil is made of copper wire. The first coil encloses a periphery of the transparent bottle. One end of the first coil passes through the though hole to be connected to a lower voltage output end of the transformer. A light emitting unit has a hollow transparent casing, a second coil, a LED lamp, a sealing cover. A diameter of the second coil is smaller than that of the first coil. The LED lamp is connected to two ends of the second coil. The light emitting unit is disposed in the transparent bottle so that the second coil of the light emitting unit is disposed in the first coil as a transformer when they are conducted.

Abstract: A foot spa apparatus is constructed to include a base holding a container, a water pump adapted to pump water from the container to horizontal spray tubes and a vertical nozzle tube to stimulate the sole of the foot and lower pat of the user's legs, a collapsible fence wall provided at the top of the container around the water chamber in the container and adjusted to the desired height, and an electric heating coil adapted to heat water in the container.