Abstract: A magnetic barrel lock assembly comprises a lock body that defines a chamber having a first end and a second end that is opposite the first end. A plunger is located within the chamber and is moveable between a locked position and an unlocked position. A lock magnet is located between the plunger and the first end of the chamber. A resilient member is configured to bias the plunger toward the first or second end of the chamber. A detent is configured to be extendable when the plunger is in the locked position and retractable when the plunger is in the unlocked position. Positioning a key magnet near the lock magnet moves the plunger to the unlocked position such that the detent may retract.

Abstract: A solid mineral composition including the following formula (I): Calcium carbonate from 4.58% to 77.8%, Dolomite from 3.85% to 69.29%, Rock salt from 5.7% to 12.4%, Lignosulphate from 4.25% to 8.49%, Potassium sulphate from 0.37% to 2.44%, Magnesium oxide from 0.01% to 0.07%, and Elemental sulphur from 0.009% to 0.066%, the above percentages consisting of the weight percentages of each of the compounds, relative to the total weight of the mineral composition dry matter, for increasing the fertility of a soil by causing an increase in at least one enzymatic activity contained in the soil, selected from (i) phosphatase, (ii) ?-xylosidase, (iii) ?-glucosidase and (iv) ?-glucosidase.

Abstract: Ductility of a high-magnesium or high-aluminum content workpiece is increased during plastic deformation of the workpiece. When the workpiece is plastically deformed in a sealed chamber comprising a high concentration of dry hydrogen gas, the workpiece exhibits increased ductility compared to the ductility of a workpiece of identical composition that is similarly deformed in air. Enhanced ductility is quantified for several workpieces comprising aluminum and magnesium alloys in various forms including extruded sheets, drawn bars, rolled plates, and piston casts. Enhanced ductility is evident over a wide range of processing temperatures without a significant decrease in strength characteristics.

Abstract: A method for forming a metal article includes: heating a mold to a working temperature ranging from 350° C. to 550° C., the mold having a forming surface with a predetermined pattern; disposing a metal sheet in the mold that has been heated, the metal sheet being made from one of aluminum alloy and magnesium alloy and having a temperature not higher than 100° C.; and forming the metal sheet by applying a fluid-pressure of not less than 10 kg/cm2 into the mold to press the metal sheet against the predetermined pattern.

Abstract: The invention refers to a method and a press tool for manufacturing a separating disk adapted to be included in a disk package of a centrifuge rotor of a centrifugal separator. The separating disk extends around an axis of rotation and has a tapering shape with an inner surface and an outer surface along the axis of rotation. A blank of a material is provided. A central opening is made in the blank. The blank is positioned in a charging position by means of a projecting central portion. The blank is pressed against the first tool part having a shape corresponding to the tapering shape of the separating disk.

Abstract: A method for making a variable pitch spring (9), in which a spring wire (1) is bent using bending lugs (5, 6) so as to impart a spiral configuration thereto, a gap is formed between the turns by placing, between the turns being formed, the beveled side of a rotary disc (2) having a rotation synchronized with the spring wire supply, the disc (2) having a beveled profile that varies along the periphery of the disc, and the spring wire is cut (3) at the end of the formation of each spring.

Abstract: The invention relates to a hot-rolling mill for cooling a leader or band (4) of a metal strand in a working roll (6, 7), in which a coolant is sprayed on the leader or the band (4), is characterized in that the leader or band (4) is shielded from contact by the coolant in the area of the band edges. Shielding devices (14, 15) are used for said purpose. A shielding device (20) can also be disposed in the area of a loop lifter, or in a cooler device between the pretreater and the final line.

Abstract: An apparatus includes an actuator having an actuation axis, a base having a base plane, a first actuator mount for associating the actuator with the base in a first position, and a second actuator mount for associating the actuator with the base in a second position, and a clamp for associating the golf club head with the base. If the actuator is in the first position, the actuation axis is substantially perpendicular to the base plane, and, if the actuator is in the second position, the actuation axis is oblique relative to the base plane.

Abstract: The corrugated fin production equipment is capable of easily separating a corrugated fin having high ribs from a die after forming the ribs. The corrugated fin production equipment comprises: a lower block; an upper block being moved to and away from the lower block; the die being provided to the lower block and having a concave section; a punch being inserted into the concave section so as to form the rib when the lower block and the upper block are closed; and a movable die constituting a part of the die including the concave section, the movable die being upwardly moved above other parts of the die so as to lift a part of the corrugated fin, in which the rib has been formed, from the underside after the lower die and the upper die are closed to form the corrugated fin.

Abstract: Self-aligning tools may be used to install and reposition an expandable structure in a workpiece. A self-aligning installation system may include an expansion mandrel, self-aligning nose cap assembly, and an installation tool for driving the mandrel. The expansion mandrel is sized to fit within a passageway of an expandable member such that the expandable member radially expands when the expansion mandrel is moved through the passageway. The self-aligning nose cap assembly moves relative to the installation tool and mandrel. A self-aligning seating system can be used to move the installed expandable member. The self-aligning seating system includes a seat backing, a seat base, and a pull rod coupled to the seat backing and extending through the seat base. The seat backing slidably engages the seat base to permit rotation of the pull rod.

Abstract: A vibration detection circuit. The circuit includes an accelerometer, a combining filter, an amplifier, and an analog to digital converter. The accelerometer generates one or more signals indicative of movement along an axis. The combining filter filters a component of the one or more signals not associated with movement and combines the components of the one or more signals indicative of movement to create a combined signal. The amplifier amplifies the combined signal and creates an amplified signal. The analog to digital converter converts the amplified signal into a digital value.

Abstract: A calibration card 10 and method of using the card 10 to calibrate an optical sensor. The card 10 comprises (i) a first mass of an oxygen sensitive fluorophore 41 configured and arranged for limiting exposure of the first mass of oxygen sensitive fluorophore 41 to near zero % oxygen, and (ii) a second mass of an oxygen sensitive fluorophore 42 configured and arranged for exposing the second mass of fluorophore 42 to an environmental concentration of oxygen.

Abstract: Apparatus (or method) for estimating a gripping characteristic of a vehicle wheel of a vehicle on a ground contact surface includes first input section (or step), a second input section (or step) and an output section (or step). The first input section sets a first input which is a ratio of a first wheel force acting on the vehicle wheel in the ground contact surface in a first direction, and a first wheel slip degree. The second input section sets a second input which is a ratio of a second wheel force acting on the vehicle wheel in the ground contact surface in a second direction, and a second wheel slip degree of the vehicle wheel. The output section determines, from the first and second inputs, an output which is a grip characteristic parameter indicative of the gripping characteristic of the vehicle wheel.

Abstract: A method for crash testing a motor vehicle is disclosed. The method provides a crash test routine where an inflatable restraint is deployed using a single deployment pattern throughout at least one government regulation zone. This helps to prevent overlap of a transition zone and can help make the deployment of the inflatable restraint more predictable. This can increase occupant safety and simply testing.

Abstract: A gas sensor (1) has an inner protector (120) and an outer protector (110); the inner protector (120) has an inner wall portion (160) having an inner gas inlet (170) for introducing gas to be measured into the interior of the inner protector (120); the outer protector (110) has an outer wall portion (130) having an outer gas inlet (140) for introducing the gas to be measured into the interior of the outer protector (110); a clearance of 1.35 mm or less is provided between the detection portion (11) and at least a portion of the inner wall portion (160); and when the gas sensor (1) is in use, the inner protector (120) is higher in temperature than the outer protector (110).

Abstract: A cartridge-like chemical sensor is formed by a housing having a base and a cover fixed to the base and provided with an input opening, an output hole and a channel for a gas to be analyzed. The channel extends in the cover between the input opening and the output hole and faces a printed circuit board carrying an integrated circuit having a sensitive region open toward the channel and of a material capable to bind with target chemicals in the gas to be analyzed. A fan is arranged in the housing, downstream of the integrated device, for sucking the gas after being analyzed, and is part of a thermal control system for the integrated circuit.

Abstract: A method to simulate distillation of a petroleum stream by comprehensive two-dimensional gas chromatography including the step of separating said petroleum stream with a two-dimensional gas chromatograph to determine polarity as a function of temperature, and integrating vertically the two-dimensional gas chromatograph at a given temperature to determine signal intensity as a function of temperature.

Abstract: Method and thermal, flow measuring device for determining at least one variable dependent on at least the chemical composition of a measured medium, wherein the measured medium has n components, wherein n is greater than or equal to two, wherein each mole fraction, volume fraction and/or mass fraction of m components of the medium is measured, wherein m is smaller than or equal to n minus one, wherein the mole fractions, volume fractions and/or mass fractions of the k components of the measured medium which are not measured, and wherein k is equal to n minus m, are established in such a manner, that the sum of the mole fractions, volume fractions and/or mass fractions of the n components amounts to one.

Abstract: A gas sensor having high detection sensitivity and a low output signal noise includes a laminate of thermistor ceramic, a catalytic electrode, an internal electrode, and external electrodes. When coming into contact with a detection target gas, the catalytic electrode generates heat, and the resistance of a thermistor layer of a sensing portion is decreased. Since the heat generated by the catalytic electrode is directly transferred to the thermistor layer without passing through an insulating layer or the like, high detection sensitivity is obtained. In addition, the structure can be formed in which heat of the sensing portion is insulated by a hollow portion and heat diffusion is prevented, so that the heat capacity of the sensing portion is further decreased.

Abstract: A nozzle plate containing multiple micro-orifices for the cascade impactor and a method for manufacturing the same are disclosed. The nozzle plate is formed by a series of semiconductor processes, including lithography, etching and electroplating. The nozzle plate comprises a plate body and a plurality of micro-orifices formed on the plate body. The orifice has a diameter which gradually expands in the direction away from the bottom of the plate body to achieve a smooth inner surface, allowing particles to pass therethrough smoothly without being clogged in the nozzle plate.

Abstract: An apparatus for obtaining information about a workpiece may include a measuring device having a nozzle defining an orifice in fluid communication with a source of incompressible fluid. A fluid monitoring apparatus may monitor a parameter of the substantially incompressible fluid, and a pump may be fluidly coupled to the source and configured to supply incompressible fluid to the orifice. The pump may have a pump chamber with a first displacement setting having a first fixed volume, so that operation of the pump at a first pump speed with the pump chamber in the first displacement setting generates a first fluid flow having a substantially constant first volumetric rate. The pump may have more than one displacement setting, or the pump may be operated at different speeds to change the volumetric flow rate. The nozzle may include multiple, independent orifice sets that may be selectively provided fluid, thereby to obtain information on different parts of the workpiece with a single placement of the nozzle.

Abstract: A method and system of providing ultrapure water for semiconductor fabrication operations is provided. The water is treated by utilizing a free radical scavenging system and a free radical removal system. The free radical scavenging system can utilize actinic radiation with a free radical precursor compound, such as ammonium persulfate. The free radical removal system can comprise use of a reducing agent. The ultrapure water may be further treated by utilizing ion exchange media and degasification apparatus. A control system can be utilized to regulate addition of the precursor compound, the intensity of the actinic radiation, and addition of the reducing agent to the water.

Abstract: Embodiments in accordance with the present invention relate to packed-column nano-liquid chromatography (nano-LC) systems integrated on-chip, and methods for producing and using same. The microfabricated chip includes a column, flits/filters, an injector, and a detector, fabricated in a process compatible with those conventionally utilized to form integrated circuits. The column can be packed with supports for various different stationary phases to allow performance of different forms of nano-LC, including but not limited to reversed-phase, normal-phase, adsorption, size-exclusion, affinity, and ion chromatography. A cross-channel injector injects a nanolitre/picolitre-volume sample plug at the column inlet. An electrochemical/conductivity sensor integrated at the column outlet measures separation signals.

Abstract: A pump portion for taking in and discharging solutions includes a first plunger pump with a small capacity and a second plunger pump with a large capacity. Intake ports of both the plunger pumps are connected in parallel to a common port of a switching valve with a first three-way valve interposed therebetween. The first three-way valve connects the intake port of one of the plunger pumps to the switching valve. Discharge ports of both the plunger pumps are connected in parallel to one port of the switching valve with a second three-way valve interposed therebetween. The second three-way valve connects the discharge port of one of the plunger pumps to the switching valve.

Abstract: A minute amount of fuel is injected into a combustion chamber during fuel cut, and a cylinder pressure is detected when the minute amount of fuel is being combusted. Then a combustion ratio is calculated based on the detected cylinder pressure, and a determination crank angle, which is used for determining a cetane number based on the combustion ratio, is determined. The cetane number is determined based on the determination crank angle.

Abstract: A method for accurately determining fuel efficiency in diesel engines of vehicles, as they exist on the job. In determining the efficiency, work done by the vehicle in combination with accurately measured fuel consumption enables calculation of the fuel efficiency of the vehicle. The method of the invention is of use in determining a baseline fuel efficiency for use in evaluating the effectiveness of fuel efficiency related improvements to the engine or vehicle. Following making the improvements, additional fuel efficiency tests using the method of the invention are carried out for comparing the new fuel efficiency with the baseline fuel efficiency. In some applications GPS systems are used for determining work done by the vehicle.

Abstract: In a quick removable position sensor installed onto a steering wheel of a motor vehicle, a transmission mechanism is sheathed onto a steering wheel axle, such that the transmission mechanism and the steering wheel axle can perform a turning movement, and an end of an angular sensor is connected to the steering wheel axle, and another end of the angular sensor is connected to the transmission mechanism, for receiving a turning signal generated and outputted by a turning of the transmission mechanism, and a casing is provided for covering the steering wheel axle, the transmission mechanism and the angular sensor, such that the components in the casing can perform the turning movement and receive the turning signal.

Abstract: A wheel position determination system and method to count wheel revolutions in a wheel unit of a tire monitoring system. An indication of the count is transmitted, optionally along with an indication of a left/right side position of the wheel on the vehicle, and an identification unique to the transmitting wheel unit, to a central controller of the tire monitoring system. In the central controller of the tire monitoring system, the count is compared with wheel speed information for the vehicle, such as from an ABS system, to determine if one wheel on each side of the vehicle is rotating at a different speed. Based at least in part upon a determination that each wheel speed is unique, a determination of wheel location may be made.

Abstract: A tire valve for a vehicle comprises a metal housing (1) and an elastic housing (2) around the metal housing (1). The metal housing (1) has a cylindrical portion (13) corresponding to a rim opening (201). The metal housing (1) has an annular flange (6) above the cylindrical portion (13), and has an annular lower flange (12) under the cylindrical portion (13). The elastic housing (2) has a cylindrical elastic portion (21) around cylindrical portion (13), and has a tapered portion (22) around the annular flange (6). The lower end of the elastic housing (2) is placed around the annular lower flange (12).

Abstract: A tire valve with an electronic box 100 of tire pressure monitoring system for automobile comprises a valve metal body 1 and an elastic body 2 around the metal body 1. The metal body 1 comprises an air introducing and discharging hole 4. The metal body 1 has an external threaded stem 5 for connecting with the electronic box 100 of tire pressure monitoring system for automobile at the end. The air introducing and discharging hole 4 is set above the external threaded stem 5. The valve metal body 1 can be mounted on the electronic box 100 of tire pressure monitoring system for automobile through the external thread, therefore the connection strength between the electronic box 100 and the valve can be reinforced conveniently.

Abstract: An exemplary method for optimizing drilling performance of a rotary drill tool is disclosed. According to the method, a rotary drill tool may be secured to an orienting member and a cutting element rotational axis of the rotary drill tool may be identified. Radial locations of a plurality of surface regions of the rotary drill tool may be measured relative to the cutting element rotational axis. At least one selected surface region from the plurality of measured surface regions may be modified such that the at least one selected surface region is located at a selected radial distance relative to the cutting element rotational axis. An exemplary method for grinding a down-hole drill tool is also disclosed. According to the method, a down-hole drill tool may be secured to a holding member in a substantially vertical orientation and portions of the down-hole drill tool may be ground using a grinding wheel.

Abstract: A method of testing the through cut of a pipeline comprising at least the steps of: (a) transmitting an electromagnetic signal through the pipeline; (b) monitoring any reflected signal(s); and (c) interpreting the or each reflected signal to test for the through cut of the pipeline. In this way, a non-invasive electromagnetic signal can be passed through, along, across or otherwise within the pipeline, and any reflected signal(s) can be interpreted and analysed based on one or more characteristics of the received signal(s) to ascertain the change in the conductivity of the pipeline due to the cutting thereof, in particular when or whether the cutting of the pipeline is complete or has been completed such that there is a through cut.

Abstract: A velocity probe capable of measuring all the three components of a velocity vector simultaneously by correlating data from three or more thermocouples is shown and described.

Abstract: A flow sensor and fastener assembly, is disclosed which includes at least the following modules: a sensor housing and a fastener element; wherein: the sensor housing is adapted to receive a flow-based sensor, e.g. a MEMS airflow sensor; the sensor housing includes a connection for transmitting sensing signals from a fitted flow-based sensor; the fastener element includes a head and a shank, at least part of the shank being externally threaded; the fastener element includes a bore extending through the whole length of the fastener element; and the bore is shaped at the head end of the fastener element to provide a sensor housing receiving part.

Abstract: An apparatus and method for measuring a level of a liquid is provided. Generally, the apparatus contains a first coaxial cable section including a first center conductor, a first outer conductor and a solid dielectric between the first center conductor and first outer conductor. The apparatus also contains a second coaxial cable section including a second center conductor, a second outer conductor and an air dielectric between the second center conductor and second outer conductor. Further, a coupling is provided between the first and second coaxial cable sections, wherein the second coaxial cable section is disposed in a liquid for determining a level of the liquid.

Abstract: Device and method for providing inertial indications with high accuracy using micro inertial sensors with inherent very small size and low accuracy. The device and method of the invention disclose use of the cluster of multiple micro inertial sensors to receive from the multiple sensors an equivalent single inertial indication with high accuracy based on the multiple independent indications and mathematical manipulations for averaging the plurality of single readings and for eliminating common deviations based, for example, on measurements of the deviation of the single readings.

Abstract: Canister-shaped magnetic reinforcing elements 31, 32 made of a ferromagnetic material having a Curie temperature higher than magnetic yokes 11, 12 are provided inside the magnetic yokes 11, 12. The inner periphery 31a, 32a of an opening in each of the magnetic reinforcing elements 31, 32 is opposed to the outer periphery 51a, 52a of each of pole piece tops 51, 52. A torquer coil 61, 62 is located between the inner periphery 31a, 32a of the opening in each of the magnetic reinforcing elements 31, 32 and the outer periphery 51a, 52a of each pole piece top 51, 52. The magnetic reinforcing elements 31, 32 provided inside the magnetic yokes 11, 12 form independent magnetic circuits. Since the magnetic reinforcing elements 31, 32 have a Curie temperature higher than the magnetic yokes 11, 12, a high accuracy of acceleration measurement in a high-temperature range can be achieved.

Abstract: The invention relates to a method and to a device for sound emission analysis, wherein vibrations occurring during the use of a component, during the testing of a component or during the processing of a work piece by means of chipping, welding, forming, joining and/or separating or the like are registered and evaluated, wherein a vibration spectrum is recorded at different times or continuously and subjected to a multi-dimensional evaluation.

Abstract: A device for checking, measuring and monitoring by ultrasound a hot weld seam between two metal parts, of the type including at least one ultrasonic transmitter. The device includes a shoe equipped with a planar face which is suitable for being in contact with a wall of one of the two parts and includes a housing for maintaining the ultrasonic transmitter in a predetermined orientation in relation to the wall, a cooling system for cooling the ultrasonic transmitter to a temperature below its operating temperature limit, and distributor for depositing and distributing a coupling product between the base plate of the ultrasonic transmitter and the wall.

Abstract: The metallization system of complex semiconductor devices may be evaluated in terms of mechanical integrity on the basis of a measurement system and measurement procedures in which individual contact elements, such as metal pillars or solder bumps, are mechanically stimulated, while the response of the metallization system, for instance in the form of directly measured forces, is determined in order to quantitatively evaluate mechanical status of the metallization system. In this manner, the complex material systems and the mutual interactions thereof may be efficiently assessed.

Abstract: An apparatus and method for inspecting a rail joint bar transported along a railway rail by an inspection vehicle is provided. The apparatus and method includes a pair of ultrasonic transducers housed in liquid-filled wheels. The wheels are positionable for a stored position to a measurement position in rolling contact with the vehicle surfaces of the rail joint bars on each side of the rail. The ultrasonic transducer transmits a signal into the rail joint bar and the reflected signal is detected by the transducer and analyzed to identify flaws in the rail joint bar.

Abstract: Two or more sound sensors are placed in a space of interest. Each sensor has a light-emitting output. Each sensor can be positioned at a specific location, such as at an ear location for a seated listener. An excitation source can provide a specified acoustical energy stimulus to the space. A user can obtain a visual impression of acoustical response of the space corresponding to the sound sensors' positions. An image acquisition system can acquire an image of the sound sensors responding to a stimulus. Acquired images can be analyzed to determine response characteristics. A presentation system can provide a display of response characteristics.

Abstract: Disclosed is a device for activating a security system in a vehicle including a first and second vehicle sensor (4). The sensor include, respectively, a measuring value sensor (4.1) which can detect acceleration and structure-borne noise, and a central unit (2) which evaluates the signals of at least two vehicle sensors (4) and activates the security system according to the signals. The first and second vehicle sensors have a first direction of sensitivity for at least one measuring value sensor (4.1), which is used to detect acceleration, and a second direction of sensitivity for at least one measuring value sensor (4.1) which is used to detect structure-borne noise.

Abstract: A relative pressure sensor for registering pressure of a medium relative to surrounding atmospheric pressure includes: a pressure measuring cell having a measuring membrane and a platform, wherein pressure of the medium can act on a first side of the measuring membrane facing away from the platform, and wherein the platform has a reference air opening, through which surrounding atmospheric pressure can act on a second side of the measuring membrane facing the platform. A support body, through which a reference air duct extends between a first surface section and a second surface section of the support body is provided, wherein the pressure measuring cell is affixed to the support body with a pressure resistant, bonded adhesive.

Abstract: An absolute piezo-resistive pressure sensor system and method employing multiple pressure sensing elements operating simultaneously to detect pressure. Both pressure sensing elements being subject to a common reference pressure within a sealed cavity. The first pressure sensing element detecting an offset voltage resulting from the progressive release of mechanical stress at an assembly interface between the sensing element and a base plate on which the sensing elements are assembled. Electronic circuitry compensates the pressure measured by the second pressure sensing element based on the offset voltage detected by the first pressure sensing element.

Abstract: The present invention allows manufacturing of a capacitive diaphragm pressure gauge and a Pirani pressure gauge on a single silicon substrate, which makes it possible to reduce the manufacturing cost by the miniaturization of products and mass production. According to an embodiment of the present invention, the manufacturing method of a combined type pressure gauge is a manufacturing method of a combined type pressure gauge including a capacitive diaphragm pressure gauge and a Pirani pressure gauge, the method including a groove-forming step of forming a first groove portion and a second groove portion on a first surface side of a silicon substrate by etching, and a bonding step to bond a glass substrate to the silicon substrate so as to cover the first groove portion and the second groove portion on the first surface side of the silicon substrate.

Abstract: A very robust sensor element for an absolute-pressure measurement is described, which is suitable for high temperatures and able to be miniaturized to a large extent. The micromechanical pressure-sensor element includes a sensor diaphragm having a rear-side pressure connection and at least one dielectrically insulated piezo resistor for signal acquisition. Furthermore, the pressure-sensor element has a front-side reference volume, which is sealed by a cap structure spanning the sensor diaphragm. The cap structure is realized as thin-film structure.

Abstract: Embodiments relate to stress sensing devices and methods. In an embodiment, a sensor device includes an active layer; and at least three contacts spaced apart from one another in the active layer, the at least three contacts being coupleable in a first configuration for a first operating mode of the sensor device in which a current in the active layer has a first ratio of horizontal to vertical components with respect to a die surface and in a second configuration different from the first for a second operating mode of the sensor device in which a current in the active layer has a second ratio of horizontal to vertical components, wherein a ratio of a resistance between at least two of the contacts in the first operating mode and a resistance between at least two of the contacts in the second operating mode is related to mechanical stress in the sensor device.

Abstract: A fibrous assembly includes two components. The first component provides a visual indication of when a pre-determined tensile load is applied to the assembly or when the fibres of the assembly have been over-extended. The first and second components are movable relative to each other, the visual indication being provided by the first component being substantially concealed by the second component and becoming at least partially exposed when the pre-determined tensile load is applied to the assembly or when the fibres have been over-extended. The first component comprises auxetic yarn.

Abstract: An ultrasonic flow meter includes a first ultrasonic sensor, a second ultrasonic sensor, a volume-flow operation portion, a temperature operation portion, a pressure operation portion, and a correction operation portion. The ultrasonic sensors transmit and receive a plurality of ultrasonic waves of different frequencies and are disposed on opposite sides of a flow channel in which fluid flows. The volume-flow operation portion calculates a volume flow of the fluid based on a propagation time difference of the ultrasonic wave. The temperature operation portion analyzes signals from one of the ultrasonic sensors and calculates a temperature of the fluid. The pressure operation portion analyzes signals from one of the ultrasonic sensors and calculates a pressure of the fluid. The correction operation portion corrects the volume flow with the temperature and the pressure.