Abstract: An electromagnetic valve as a fluid device is provided with a valve seat and a valve body midway of a flow path where a liquid flows, and closes the valve with the valve body pressed onto the valve seat and opens the valve by causing a gap between the valve seat and the valve body. The electromagnetic valve includes, as electrodes for measuring a degree of electrical conductivity between a liquid on an upstream side and a liquid on a downstream side of the valve seat and the valve body in the flow path, a first electrode electrically conductive to the liquid on the upstream side and a second electrode electrically conductive to the liquid on the downstream side. By using the first and second electrodes, detection of liquid leakage can be easily performed.

Abstract: An electromagnetic valve as a fluid device is provided with a valve seat and a valve body midway of a flow path where a liquid flows, and closes the valve with the valve body pressed onto the valve seat and opens the valve by causing a gap between the valve seat and the valve body. The electromagnetic valve includes, as electrodes for measuring a degree of electrical conductivity between a liquid on an upstream side and a liquid on a downstream side of the valve seat and the valve body in the flow path, a first electrode electrically conductive to the liquid on the upstream side and a second electrode electrically conductive to the liquid on the downstream side. By using the first and second electrodes, detection of liquid leakage can be easily performed.

Abstract: A joint system includes flow paths coupled to a fluid device which handles a fluid, first and second electrodes separately provided to the flow paths to electrically make contact with the fluid in the flow paths, and a detection circuit which detects whether the fluid passing through the fluid device is present or absent. The detection circuit measures a degree of electrical conductivity between the flow paths by using the first and second electrodes and detects whether the fluid passing through the fluid device is present or absent in accordance with the degree of electrical conductivity between the flow paths.

Abstract: Inside a case (1) of a culture medium exchange unit, a well plate (3) with wells (4) is disposed, and cells and a culture medium are placed into each of the wells (4) of the well plate (3) and cell culture is performed, and after a predetermined period of time, the culture medium inside each well (4) is exchanged. The well plate (3), a supply liquid contact part (8) of a supply pump (6), a supply tube (9), supply nozzles (10), discharge nozzles (17), discharge tubes (15), and discharge liquid contact parts (14) are disposed so as to be removable from the case (1) and replaceable.

Abstract: A circular arc shaped flow path (21) is formed as a microfluidic flow path in a sheet-like microfluidic chip (20). A roller (15) on a rotor (10) is pressed against the circular arc shaped flow path (21) in the microfluidic chip (20), the rotor (10) is rotary-driven by a driving motor 4, and the circular arc shaped flow path (21) is caused to make a peristaltic motion by rotation of the rotor (10), to send a liquid in the flow path. On the flat surface of the rotor (10), a plurality of rollers (15) are held so as to be pressed in contact with the circular arc shaped flow path (21), to freely rotate on the flat surface perpendicular to a rotary shaft (13) of the rotor (10). The circular arc shaped flow path (21) is disposed along the rotational trajectory of the plurality of rollers (15).

Abstract: A device for controlling the temperature of a conductive member, which detects the electrical resistance of the conductive member, calculates the temperature of the conductive member based on the detected electric resistance, and adjusts the temperature of the conductive member based on the calculated temperature, is disclosed.

Abstract: A device for controlling the temperature of a conductive member, which detects the electrical resistance of the conductive member, calculates the temperature of the conductive member based on the detected electric resistance, and adjusts the temperature of the conductive member based on the calculated temperature, is disclosed.

Abstract: A reaction purifier (100) using microorganisms which feed on harmful components in exhaust gas is installed in an exhaust passage (18, 21, 22, 23, 24) of an engine (1). The microorganisms are mixed with a culture fluid, and the culture fluid is circulated through tubes (111) in which micro holes (111A) are formed. The diameter of these holes is such as not to allow culture fluid to pass, but to allow exhaust gas to pass. The tubes (111) are housed in a casing (112), and harmful components are removed by leading exhaust gas into the casing (112) to bring into contact with the microorganisms in the culture fluid. By using the reaction purifier (100) and catalytic converter (20A, 20B) in conjunction, even better exhaust gas purifying performance is obtained.

Abstract: Fuel in a fuel tank is pressurized by a fuel pump and supplied to a fuel gallery. When a fuel injection valve connecting with this gallery is opened by an electromagnetic signal, fuel is injected from the valve into a combustion chamber of the engine. The fuel gallery is formed inside a cylinder head, and the fuel injection valve is disposed in the cylinder head such that a fuel inlet port of the valve faces the gallery. In this manner, a high pressure fuel passage does not project outside the cylinder head, and there is less risk of fuel leaking from the passage. Further, as the high pressure fuel passage does not project outside the engine, the piping around the engine is simplified.