Abstract: The present invention makes a pitot tube type flowmeter less affected by the flow velocity distribution caused by the flow passage shape on the upstream side, and includes a pitot tube having total pressure holes for detecting a total pressure of a fluid and static pressure holes for detecting a static pressure of the fluid, and a differential pressure sensor that is connected to the pitot tube and detects a differential pressure between the total pressure and the static pressure. The pitot tube includes a main tube portion, and a plurality of branch tube portions, which branches off from the main tube portion and in which the total pressure holes and the static pressure holes are formed. Each of the main tube portion and the plurality of branch tube portions has a shape that reduces a pressure loss.

Abstract: A measurement instrument comprises a cylindrical cell that stores a measurement fluid, a light source that is arranged outside the cell and irradiates the measurement fluid with inspection light, a detector that is arranged outside the cell and detects transmitted light or scattered light generated from the measurement fluid, a cleaning mechanism that is arranged inside the cell and cleans an inner peripheral surface of the cell, and a drive mechanism that rotates the cell about a central axis.

Abstract: At a measuring device, a measurement gauge comprises a measurement fluid passage and a measurement connection port, a main body comprises a main body fluid passage and a main body connection port, and a connector comprises a connecting tube, a first end of which is inserted into an interior of the measurement connection port, and a second end of which is inserted into an interior of the main body connection port, an annular first elastic body which seals a region between an outside circumferential portion of the first end of the connecting tube and an inside circumferential portion of the measurement connection port, and an annular second elastic body which seals a region between an outside circumferential portion of the second end of the connecting tube and an inside circumferential portion of the main body connection port.

Abstract: A concentration apparatus including a negatively charged membrane, a sample water supply, a first solenoid valve on a flow path from the sample water supply to the negatively charged membrane, an acidic solution storage tank storing an acidic solution, a second solenoid valve on a flow path from the acidic solution storage tank to the negatively charged membrane, an alkaline solution storage tank storing an alkaline solution, a third solenoid valve on a flow path from the alkaline solution storage tank to the negatively charged membrane, an outlet to discharge fluid, a fourth solenoid valve and a first suction pump each on a flow path from the negatively charged membrane to the outlet, a collection container in which fluid is collected, a fifth solenoid valve on a flow path from the negatively charged membrane to the collection container, and a controller that controls opening and closing of the solenoid valves.

Abstract: A filtration member 110 including pores having a pore diameter through which microorganisms may pass and configured to have a positive charge or a negative charge upon application of a voltage.

Abstract: In order to avoid an electrode from disturbing a flow of a fluid in a flow channel in case that the electrode of an electric conductivity meter is arranged in the flow channel, the electric conductivity meter comprises two tubular electrodes inside of each of which respectively formed is an inner flow channel where the fluid flows, and an electrode holder that communicates each of the inner flow channels of the two electrodes and that holds the two electrodes. The electrode holder holds the two electrodes by making an engagement with each outer peripheral surface of mutually facing axial direction end parts of the two electrodes.

Abstract: In order to avoid an electrode from disturbing a flow of a fluid in a flow channel in case that the electrode of an electric conductivity meter is arranged in the flow channel, the electric conductivity meter comprises two tubular electrodes inside of each of which respectively formed is an inner flow channel where the fluid flows, and an electrode holder that communicates each of the inner flow channels of the two electrodes and that holds the two electrodes. The electrode holder holds the two electrodes by making an engagement with each outer peripheral surface of mutually facing axial direction end parts of the two electrodes.

Abstract: In order to improve measurement accuracy by accurately calibrating sensitivity of a dissolved oxygen meter without impairing easiness in calibration, the present invention includes a dissolved oxygen measuring device that includes a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution; and a mode switching mechanism to switch between a measurement mode, in which a sensor surface of the dissolved oxygen meter is substantially in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is substantially not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.

Abstract: A measuring device comprises a guard electrode that is arranged around a cathode, reduces oxygen that is not from an oxygen permeable membrane, and inhibits the oxygen from reaching the cathode. The guard electrode is electrically connected to an anode through a resistor having a prescribed resistance.

Abstract: In order to improve measurement accuracy by accurately calibrating sensitivity of a dissolved oxygen meter without impairing easiness in calibration, the present invention includes a dissolved oxygen measuring device that includes a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution; and a mode switching mechanism to switch between a measurement mode, in which a sensor surface of the dissolved oxygen meter is substantially in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is substantially not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.

Abstract: A measuring device comprises a guard electrode that is arranged around a cathode, reduces oxygen that is not from an oxygen permeable membrane and inhibits the oxygen from reaching the cathode. The guard electrode is electrically connected to an anode through a resistor having a prescribed resistance.

Abstract: A safety shut-off valve opening a flow path between the primary and secondary sides in case of usual operation, while shutting off the aforesaid path in response to an emergency shut-off signal, and particularly such safety shut-off valve cannot be reset unitl it is confirmed that there is no more leakage of gas on the secondary side of the shut-off valve after the shut-off action was once effected, thereby to attaining a very high safeness.

Abstract: An electromagnetic actuator utilizing a fluid pressure obtained from an electromagnetic pump, wherein according to the present invention, there is provided a responsive member displaceable in response to the pressure of a fluid forced into a second chamber from a first chamber. The responsive member displaceable as described can operate a valve member or the like coupled thereto in an on-off control or a proportional control with a large stroke in a reliable manner.