Abstract: A fluid heater includes: a passage member having a passage formed therein; a heater for heating the passage member; a fixing member for fixing the passage member to a fluid control device; and a connection member connected to the passage member so as to allow fluid to flow into the passage member. The passage has a helical shape.

Abstract: Provided is a small-sized controller capable of precisely controlling a flow rate of a high-pressure fluid. Between a working shaft of a drive device and a valve stem, a power transmission device is disposed to amplify a force acting on the working shaft and transmit the resultant force to the valve stem. A diaphragm as a valve element is made of metal and is deformable to: a state where a fluid passage is fully closed; a state where the fluid passage is fully open; or a state where the fluid passage is partially open. When the fluid passage is partially open, on the basis of the flow rate of a fluid flowing through fluid passages, the drive device finely adjusts the position of the working shaft such that the flow rate is constant.

Abstract: A fluid controller is provided having a flow path through which a fluid can flow, a closed space separated from the flow path by an isolation member, and a leak port capable of communicating the closed space with an external part. An anomaly detection device for detecting an anomalty has a pressure sensor detachably fixed to the leak port, a pressure sensor for detecting the pressure in the closed space, a processing module for executing a predetermined information processing, and an detachable mechanism for blocking the leak port from the external part in the state of being fixed. The processing module determines an anomaly of the fluid controller by comparing a detection value detected by the pressure sensor to a predetermined threshold, and transmits a discrimination result of the anomaly of the fluid controller to a server.

Abstract: Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: a first surface located on the inner diameter side; a first annular protrusion located on the outer diameter side of the first surface; a second surface located on the outer diameter side of the first protrusion; a second annular protrusion located on the outer diameter side of the second surface and having a greater protruding amount with respect to the second surface than that of the first protrusion; and a third surface located on the outer diameter side of the second protrusion.

Abstract: Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: an annular protrusion; an inclined surface located on an inner diameter side with respect to the annular protrusion and inclined in a direction away from the gasket; and an outer-diameter-side surface located on an outer diameter side with respect to the protrusion.

Abstract: To provide a concentration measurement method with which the concentrations of predetermined chemical components can be measured non-destructively, accurately, and rapidly by a simple means, up to the concentrations in trace amount ranges, as well as a concentration measurement method with which the concentrations of chemical components in a measurement target can be accurately and rapidly measured in real time up to the concentrations in nano-order trace amount ranges, and which is endowed with a versatility that can be realized in a variety of embodiments and modes. In the present invention, a measurement target is irradiated, in a time sharing manner, with light of a first wavelength and light of a second wavelength that have different optical absorption rates with respect to the measurement target. The light of each wavelength, arriving optically via the measurement target as a result of irradiation with the light of each wavelength, is received at a shared light-receiving sensor.

Abstract: A fluid controller that reduces an increase in cost by additional components or additional processes for setting means, and solves the problem that a set value of an upward movable amount of a stem changes is provided. An upper surface of an outer peripheral edge portion of a diaphragm holder 7 and a lower surface of an inner peripheral edge portion of a holder adapter 15 are formed so as to oppose to each other with a first gap A interposed therebetween. By setting the first gap A to a predetermined value, an upward movable amount of the diaphragm holder 7 is set.

Abstract: An inline concentration meter includes a light source unit emitting mixed light containing at least two wavelengths with a phase difference, a detecting unit including a light incident part for entering the mixed light emitted from the light source unit into a fluid passage of a detector body and at least two light detection parts receiving the mixed light passed through the fluid passage, a computing processor unit conducting frequency analyzes of detection signals of the mixed light output from the respective light detection parts and computing variations of intensities of the detection signals corresponding to absorbances in at least two frequency ranges to compute a concentration of fluid in the fluid passage based on the variations of the intensities of the detection signals, and a recording/displaying unit recording and displaying a value of the fluid concentration computed at the computing processor unit.

Abstract: Provided is a diaphragm valve in which seat leak occurrence is drastically decreased. A depression 14 is provided at a radially middle part of a top of the seat 11. A first seal portion 17 is provided between a diaphragm 6 and a radially inward part 15 of the top of the seat 11. A second seal portion 18 is provided between a diaphragm 6 and a radially outward part 16 of the top of the seat 11. An outer circumferential surface 14b of the depression 14 has a cylindrical surface.

Abstract: A concentration measurement device including at least one light source; a measurement cell for containing a fluid to be measured; a splitter for dividing light from the light source into incident light being incident into the measurement cell and non-incident light not being incident into the measurement cell; a transmitted-light detector for detecting transmitted light that is the incident light having passed through the measurement cell; a non-incident light detector for detecting the non-incident light; and an arithmetic part for correcting a detection signal of the transmitted-light detector using a detection signal of the non-incident light detector.

Abstract: Provided herein is a pipe joint of a relatively small joint diameter for use under ultrahigh pressure conditions. The pipe joint includes first and second joint members having mutually communicating fluid passages; and a gasket interposed between abutting end surfaces of the first and second joint members. The first and second joint members have ring-shaped seal projections formed at the abutting end surfaces thereof. The pipe joint satisfies a coefficient F of 0.4 or less in the following formula (1). F=(D32?D12)/(D42?D22), ??Formula (1): where D1 represents the inner diameter of the first and second joint members, D2 represents the inner diameter of the gasket, D3 represents the diameter of the seal projections, and D4 represents the outer diameter of the gasket.

Abstract: Provided is a switching valve for use in an analyzer module for switching flow passages of fluids, in which the manufacturing cost is reduced and the life is increased. The valve element is provided with a lower contact portion that comes into close contact with a lower valve seat disposed at a valve body when a valve is closed, and with an upper contact portion that comes into close contact with an upper valve seat disposed at a counter plate when the valve is open. The counter plate has a first recess that is open downward and a second recess that is open toward the first recess and has a smaller horizontal cross-sectional area than that of the first recess, and the upper valve seat is press-fitted into the second recess.

Abstract: An inline concentration measurement device comprises: a measurement cell main body with a gas flow path formed; a light incident part with a window member connected to the main body; and a light receiving part with a window member connected to the main body, wherein the gas flow path includes a gas flow path for an optical path extending straight between the window members of the light incident part and the light receiving part, a first communication part making a gas inlet formed in the main body communicate with the gas flow path part for the optical path, and a second communication part making a gas outlet formed in the main body communicate with the gas flow path part for the optical path, and the first communication part obliquely extends from the gas inlet towards the window member of the light incident part.

Abstract: A valve element movement mechanism includes: a first valve stem having one end portion to which a first valve element to close and open an area between one of the large diameter portion and the small diameter portion is fixed; a second valve stem having one end portion to which a second valve element to close and open an area between the other of the large diameter portions and the small diameter portion is fixed; a first bellows having one end portion fixed to a first bellows flange and the other end portion fixed to the first valve element; a second bellows having one end portion fixed to a second bellows flange and the other end portion fixed to the second valve element; a frame disposed outside the main passage; and an actuator to move the frame in the directions in which valve elements are closed and opened.

Abstract: Provided is a fluid controller which enables precise flow-rate adjustment while securing the durability. The fluid controller includes a stem vertical-movement-amount upper-limit-value setting means 10 which sets an upper limit value of a vertical movement amount of a stem 8 associated with opening and closing operations. The fluid controller further includes a stem vertical-movement-amount fine-adjustment means 11 which changes the vertical movement amount of the stem 8 associated with the opening and closing operations, within a range of not greater than the upper limit value.

Abstract: A gasket includes a thick portion providing a first face seal and a thin portion providing a second face seal. A fluid coupling has an annular gasket housing recess that includes a wide portion for housing the thick portion of the gasket and a narrow portion for housing the thin portion of the gasket.

Abstract: Provided is a fluid controller in which reduction of the accuracy caused by the loosening of a screw portion and reduction of the durability caused by torsional stress are prevented. A stem vertical-movement-amount adjustment means 11 is provided with: a handle 41 which has a female screw 41b on an inner periphery thereof and which is rotatably supported by a casing 4; a movable body 42 in which a male screw 46b is provided on an outer periphery thereof and is screwed into the inner periphery of the handle 41; and a guide means 43 which prevents rotation of the movable body 42 relative to the casing 4 and which enables vertical movement of the movable body 42.

Abstract: Provided are a fixing device for a lower-stage member which facilitates a leveling operation for making upper surfaces of lower-stage members coplanar, and can further enhance a vibration absorbing effect generated by an elastic member, and a fluid control device which includes the fixing device. A fixing device for a lower-stage member is configured such that respective lower-stage members (2) are fixed once and, thereafter, a desired lower-stage member (2) is moved upwardly against an elastic force (21) so as to finely adjust positions of upper surfaces of a plurality of lower-stage members (2). The elastic member (21) is formed of an annular body made of rubber or a synthetic resin. A cutout (21a, 21b) which imparts the elastic deformation by bending when a force in the vertical direction is applied to the elastic member (21) is formed on an upper portion and a lower portion of an inner peripheral surface of the elastic member (21).

Abstract: A concentration measurement device for measuring the concentration of a measured fluid within a measurement cell by detecting transmitted light that has passed through the measurement cell having a light incidence window and a light emission window disposed opposing to each other, comprising a reflected-light detector for detecting reflected light of the light incidence window.

Abstract: A concentration measurement device including at least one light source; a measurement cell for containing a fluid to be measured; a splitter for dividing light from the light source into incident light being incident into the measurement cell and non-incident light not being incident into the measurement cell; a transmitted-light detector for detecting transmitted light that is the incident light having passed through the measurement cell; a non-incident light detector for detecting the non-incident light; and an arithmetic part for correcting a detection signal of the transmitted-light detector using a detection signal of the non-incident light detector.