JP3595247B2 - Sensor unit for flow velocity measuring device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sensor unit for a flow velocity measuring device that measures the flow velocity of a fluid based on transmission / reception of a wave to / from a fluid in a pipe, and more particularly to adjustment of a contact position of a transmission / reception unit that transmits / receives a wave to a pipe surface. .
[0002]
[Prior art]
The flow in the fluid pipe depends on the shape of the pipe (eg, bend, enlargement / reduction of inner diameter, etc.), the surface condition of the inner wall of the pipe (eg, unevenness, presence of attached deposits, etc.), and the characteristics of the fluid (eg, presence / absence of a mixture, viscosity, etc.) For example, it is difficult to predict because it changes depending on various factors, and the measurement of the actual flow rate or flow rate in the fluid piping is very useful. However, if the flowmeter is fixedly installed at various points in the piping system, the configuration of the piping system becomes complicated, or the installation cost or the maintenance cost increases. 2. Description of the Related Art There is a flow rate measuring device that has a detachable sensor unit attached thereto and measures the flow velocity or flow rate inside a pipe using the sensor unit.
[0003]
As a sensor unit for such a flow velocity measuring device, a sensor unit shown in FIG. 8 has been conventionally known. The measurement principle and the schematic configuration of a conventional sensor unit will be described below with reference to FIGS. 6 is an explanatory diagram showing transmission and reception of ultrasonic waves by the sensor unit, FIG. 7 is a schematic diagram showing propagation of ultrasonic waves in a pipe when the pipe diameter is different, and FIG. 8 is a diagram showing a conventional sensor unit. FIG. The upper part of FIG. 8 is a plan view of the sensor unit, and the lower part is a side view of the sensor unit.
[0004]
First, the principle of measuring the flow velocity by the flow velocity measuring device will be described with reference to FIG. The propagation speed of a wave propagating in a fluid changes according to the flow velocity of the fluid as a medium. That is, in the fluid in the pipe, there is a speed difference between the propagation speed of the wave in the direction along the flow of the fluid (forward flow direction) and the propagation speed of the wave in the direction opposite to the flow of the fluid (backflow direction). That is, if the difference in the propagation velocities is grasped, the flow velocity of the fluid in the pipe can be measured. This method is called a propagation velocity difference method.
[0005]
The sensor unit 90 includes a pair of wave transmitting / receiving sections 96 that contact the surface of the pipe 80 and transmit and receive ultrasonic waves to and from the fluid in the pipe. The pair of wave transmitting / receiving sections 96 are arranged at a predetermined distance from each other in the axial direction of the pipe 80, that is, in the flowing direction of the fluid. Each of the wave transmitting / receiving units 96 also serves as a wave transmitting unit and a wave receiving unit, and transmits / receives ultrasonic waves to / from the other wave transmitting / receiving unit 96 forming a pair via the fluid in the pipe. Then, ultrasonic waves are transmitted and received between the pair of wave transmitting and receiving units 96 in the forward flow direction and the backward flow direction of the fluid, and for example, a time difference between a time required for propagation in the forward flow direction and a time required for propagation in the backward flow direction is detected. The flow velocity of the fluid in the pipe is measured based on the time difference (this method is classified as the propagation time difference method in the propagation speed difference method). As shown in FIG. 6, the sensor unit 90 employs a method (V method) of receiving ultrasonic waves reflected on the inner wall of the pipe.
[0006]
Since the separation distances L1 and L2 between the transmitting and receiving units 96 at which the receiving intensity at the receiving unit is maximum differ depending on the measurement environment or conditions, the adjustment is performed each time the measurement is performed. In particular, the influence of the pipe diameters D1 and D2 is great. For example, as shown in FIG. 7, if the radiation direction θ of the ultrasonic wave from the transmitting unit is constant, the separation distances L1 and L2 that maximize the receiving intensity are: It changes according to the pipe diameters D1, D2 of the pipe 80.
[0007]
For this reason, as shown in FIG. 8, the sensor unit 90 includes a movable body 94 that is movable in the axial direction of the pipe 80, and one of the pair of wave transmitting / receiving sections 96 is supported on the support base 92 and the other is mounted on the support base 92. The moving body 94 is provided. Each wave transmitting / receiving section 96 is pressed against the surface of the pipe 80 by a spring 98.
[0008]
In this sensor unit 90, the wave transmitting / receiving section 96 is pressed against the surface of the pipe when mounted on the pipe 80. Therefore, when the moving body 94 is moved in this state, the wave transmitting / receiving section 96 The contact surface or the surface of the pipe 80 may be damaged. Therefore, the position adjustment of the wave transmitting / receiving unit 96 by the movement of the moving body 94 is performed with the sensor unit 90 removed from the pipe 80.
[0009]
[Problems to be solved by the invention]
However, in such a position adjustment, in many cases, a desired reception intensity cannot be obtained in the reception unit of the sensor unit attached to the pipe by a single adjustment. In this case, the position adjustment of the transmission / reception unit is necessary again. In such a case, the procedure is such that the sensor unit is temporarily removed from the pipe, the position of the wave transmitting / receiving section is adjusted, and the sensor unit is attached to the pipe again, which requires a great deal of labor and time.
[0010]
[Means for Solving the Problems]
In view of the above problems, according to the present invention, a support base detachably mounted on a pipe surface, a pair of wave transmitting / receiving sections for transmitting and receiving a wave to and from a fluid in the pipe by contacting the pipe surface, table to be carried on moving self standing along the axial direction of the pipe, and a moving body responsible lifting one of the pair of wave transceiver section, the flow rate of the pipe fluid based on transmission and reception of wave In the sensor unit for the flow velocity measuring device for measuring the flow rate, the moving body carries the wave transmitting / receiving section movably in a substantially radial direction of the pipe, and moves the wave transmitting / receiving section in a state of being separated from the pipe surface. It has a configuration that can be locked to a body, and by locking the wave transmitting and receiving unit to the moving body in a state where the wave transmitting and receiving unit is separated from the pipe surface, the axial direction of the pipe without bringing the wave transmitting and receiving unit into contact with the pipe surface. The position adjustment of the wave transmitting / receiving part is made possible .
[0011]
According to such a configuration, the moving body can be moved in a state where the wave transmitting / receiving section is separated from the pipe surface, so that the sensor unit can be easily and more quickly transmitted and received while the sensor unit is mounted on the pipe. The position of the wave transmitting / receiving section can be adjusted without damaging the section or the pipe surface.
[0012]
Further, according to the present invention, a support base detachably mounted on the pipe surface, a pair of wave transmitting and receiving units for transmitting and receiving a wave to and from the fluid in the pipe in contact with the pipe surface, and the support base , is carried axially move self standing along the pipe, and a moving body that their respective carrying said pair of wave transceiver unit, measuring the flow rate of the pipe fluid based on transmission and reception of wave A sensor unit for a flow velocity measuring device, wherein the moving body supports the wave transmitting / receiving portion movably in a substantially radial direction of the pipe, and the moving body is attached to the moving body in a state where the wave transmitting / receiving section is separated from the pipe surface. It has a lockable configuration, and by locking the wave transmitting and receiving unit to the moving body in a state where the wave transmitting and receiving unit is separated from the pipe surface, the wave transmitting and receiving unit can be axially moved without contacting the wave transmitting and receiving unit with the surface of the pipe. The position of the transmitting and receiving part can be adjusted .
[0013]
In the case where one of the transmitting and receiving units is fixedly installed on the support base as in the conventional system, at the time when the support base is mounted on the piping, the relative position of the transmitting and receiving unit fixed to the support base with respect to the piping is changed. Position is automatically determined. However, in an actual piping system, the mounting position of the support base on the piping may be limited or the contact position of the wave transmitting / receiving section on the piping surface may be limited due to the configuration of the piping system. In some cases, these conditions could not be satisfied, and good measurement results could not be obtained. According to the configuration of the present invention, the mounting position of the support base on the pipe and the contact position of the pair of wave transmitting / receiving sections on the pipe can be set independently of each other, so that the flow velocity can be measured more accurately.
[0014]
In the present invention also scale readable movement position in the axial direction of the pipe of the wave transceiver unit to be carried on before Symbol mobile, it is preferable to comprise removably to said supporting base.
[0015]
As described above, the axial position of the wave transmitting and receiving unit where the wave receiving intensity is maximized differs depending on the size of the pipe diameter, so the pipe diameter is measured with a separately prepared scale, and the position is adjusted according to the measured pipe diameter. Adjustments were being made. According to the configuration of the present invention, the support base is provided with a detachable scale, and thereby, the outer diameter of the pipe and the axial position of the pipe of the transmitting / receiving section can be measured. No labor is required.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 is a schematic configuration diagram of a sensor unit for a flow velocity measuring device according to the present embodiment, FIG. 2 is a side view showing a moving body and a wave transmitting / receiving unit, and FIG. 3 is a perspective view showing a lock mechanism. Shown respectively. 1 (a) is a view showing an arrow A in FIG. 1 (b), and FIG. 1 (c) is a view showing an arrow B in FIG. 1 (b). Further, in the following description, for convenience, the direction toward the outside of the pipe in the radial direction of the pipe is referred to as “up”, and the direction toward the inside of the pipe is referred to as “down”.
[0017]
The sensor unit 10 according to the present embodiment includes a support base 12 detachably mounted on the surface of the pipe 80, a moving body 20 supported on the support base 12 to freely move the pipe 80 in the axial direction. Is provided.
[0018]
The support base 12 is provided with a top plate 12a having a function as a guide portion for freely supporting and guiding the moving body 20 in the axial direction of the pipe 80, and a support member 12b standing upright on the pipe surface and supporting the top plate 12a. And In the present embodiment, the top plate 12a is formed in a rectangular plate shape, and the support members 12b are respectively suspended from a pair of opposed long sides of the top plate 12a. It is configured as a shared rectangular plate-like member. Further, the two support members 12b are configured at the same height. The guide portion has a long hole 14 extending in the longitudinal direction at the center of the top plate 12a. A belt through hole 16 is provided in the vicinity of the longitudinal end of the support member 12b. By winding the belt 70 through the belt through hole 16 around the pipe 80, the support base 12 is attached to the pipe 80. Installing.
[0019]
The moving body 20 is supported on the support base 12 so as to freely reciprocate in the axial direction of the pipe 80, and the movement of the pipe 80 in the radial direction (the direction of approach / separation from the pipe 80) is restricted. In the present embodiment, the moving body 20 includes a first member 22 above the top plate 12a and a second member 24 below the top plate 12a. The first member 22 and the second member 24 are fastened through a penetrating portion 26 vertically penetrating the elongated hole 14. The fastening between the first member 22 and the second member 24 is a screw fastening, and functions as a fixing mechanism for fixing the moving body 20 to the support base 12. That is, when the first member 22 is turned and the screw is tightened, the periphery of the long hole 14 of the top plate 12a is sandwiched by the first member 22 and the second member 24, and the moving body 20 is moved to the top plate. When the screw is loosened and fixed to 12a, the peripheral portion of the elongated hole 14 between the first member 22 and the second member 24 is loosely pinched, and the axial direction can be freely moved. However, also in this case, the movement of the moving body 20 itself in the radial direction of the pipe 80 is regulated by the first member 22 and the second member 24. The moving body 20 includes a through hole 28 that penetrates vertically in the through portion 26. The function of the through hole 28 will be described later.
[0020]
In addition, the sensor unit 10 includes a pair of wave transmitting and receiving units 30 that contact the pipe surface and transmit and receive a wave, for example, an ultrasonic wave, to the fluid in the pipe. In the present embodiment, both of the pair of wave transmitting and receiving units 30 are respectively supported by different moving bodies 20 so as to freely contact / separate from the pipe surface.
[0021]
The wave transmitting / receiving section 30 is located below the second member 24 and includes a wave transmitting / receiving section main body 32 having a built-in wave transmitting section and a wave receiving section, and is located above the first member 22 and located below the wave transmitting / receiving section 30. A locking member 34 for preventing falling off, a guide rod 36 which is inserted into the through hole 28 provided in the moving body 20 and is guided in the up-down direction to fasten the transmitting / receiving section main body 32 and the locking member 34; Is provided. A spring 42 is provided between the moving body 20 and the wave transmitting / receiving unit 30 to urge the wave transmitting / receiving unit 30 downward with respect to the moving body 20, that is, toward the pipe surface side. In the present embodiment, the spring 42 is provided between the second member 24 and the wave transmitting / receiving section main body 32. The locking member 34 is rotatably supported on the guide rod 36 in the axial direction of the guide rod 36.
[0022]
Each transmitting and receiving unit 30 incorporates a transmitting and receiving element such as an ultrasonic transducer that also serves as a transmitting unit and a receiving unit, and a controller (not shown) switches the transmission and reception of the wave in the transmitting and receiving unit 30, for example, the ultrasonic wave, Waves in the forward flow direction and the backward flow direction are transmitted and received between the pair of wave transmitting and receiving units 30. The transmitting / receiving element is connected to this controller via a wiring 38. When transmitting, the transmitting signal from the controller is converted into a wave and transmitted, and when receiving, the received wave is converted into a receiving signal. And send it to the controller. The controller calculates the flow velocity based on the transmission signal or the reception signal. In the present embodiment, based on the transmission timing, the reception timing, and the separation distance between the transmission / reception units 30 separately input to the controller, the propagation velocities in the forward flow direction and the reverse flow direction, the speed difference between them, and the speed difference, Based on the calculated flow velocity or flow rate, these are displayed on a display unit (not shown).
[0023]
Further, the sensor unit 10 includes a lock mechanism for locking the wave transmitting / receiving section 30 to the moving body 20 in a state where the wave transmitting / receiving section 30 is separated from the pipe surface. The moving body 20 is connected to the pipe 80 with the wave transmitting / receiving section 30 locked by the lock mechanism. It is configured to be movable in the axial direction.
[0024]
In the present embodiment, the lock mechanism 50 includes a regulating member 52 that is provided on the moving body 20 and regulates the downward movement of the wave transmitting and receiving unit 30. The wave transmitting / receiving section 30 is provided with an escape section 54 for escaping the regulation member 52 and releasing the regulation by the regulation member 52. More specifically, for example, the first member 22 is provided with a plurality of, for example, two pins, for example, two or more regulating members 52 protruding upward from the upper surface thereof. In the wave transmitting / receiving section 30, for example, the locking member 34, an escape section 54 for releasing the pin 52 by loosely inserting the pin 52 to release the restriction by the pin 52, for example, a release hole is provided.
[0025]
As shown in FIG. 2A, when the locking member 34 escapes the regulating member 52 (that is, when the locking member 34 is at the rotation position where the pin 52 is loosely inserted into the release hole 54; unlocked state). Since the wave transmitting and receiving unit 30 is urged downward by the spring 42, the wave transmitting and receiving unit 30 (the wave transmitting and receiving unit main body 32) is pressed against the surface of the pipe. On the other hand, when the locking member 34 is regulated by the regulating member 52 as shown in FIG. 2B (that is, when the locking member 34 is not at the rotation position where the pin 52 is loosely inserted into the release hole 54; locked state). ), The lower surface of the locking member 34 abuts on the upper end of the pin 52 located above the upper surface of the first member 22, thereby restricting the downward movement of the wave transmitting / receiving section 30 and the wave transmitting / receiving section 30. The (wave transmitting / receiving section main body 32) is held at an upper position before coming into contact with the pipe 80, and the wave transmitting / receiving section 30 is locked so as not to contact the pipe surface.
[0026]
With such a configuration, the moving body 20 is movable along the axial direction of the pipe 80 in a state where the wave transmitting / receiving section 30 is kept apart from the pipe surface. For this reason, it is possible to move the wave transmitting / receiving section 30 without making contact with the surface of the pipe, and more quickly adjust the position of the wave transmitting / receiving section 30 while the sensor unit 10 is attached to the pipe 80.
[0027]
In order to change the unlocked state (FIGS. 2 (a) and 3 (a)) to the locked state (FIGS. 2 (b) and 3 (b)), the pin 52 is used to lock the locking member 34 with the release hole. The locking member 34 may be released by pulling it up to a position where the locking member 34 is pulled out, turning the locking member 34 by a predetermined angle α, and releasing the locking member 34. Further, the locking member 34 is provided with a flange 34a, and the locking member 34 can be easily pulled up by gripping the flange 34a.
[0028]
Further, in the present embodiment, a scale 62 is provided detachably on the support base 12 and is capable of reading the position of the wave transmitting and receiving unit 30 carried by the moving body 20 in the pipe axis direction. An indicator needle 29 for indicating the scale is fixed to the moving body 20, and the position of the moving body 20 in the pipe axis direction can be easily measured. The scale 62 includes a magnetic material such as a permanent magnet, and is configured to be detachable from the support member 12b made of a magnetic material such as iron. The support member 12b is provided with a guide portion 18, for example, a guide protrusion for guiding the sticking posture of the scale 62. The guide portion 18 is extended so that the contact surface is parallel to the axial direction of the pipe 80, and the scale 62 is moved in the axial direction of the pipe 80 by bringing the end of the scale 62 into contact with the contact surface. Can be mounted in parallel. With such a configuration, the position of the wave transmitting / receiving unit 30 in the pipe axis direction can be adjusted with higher accuracy. In addition, since the outer diameter of the pipe 80 can be measured by removing the scale 62 from the support member 12b, the position of the wave transmitting / receiving section 30 carried on the moving body 20 in the pipe axial direction or a pair of The distance between the wave transmitting and receiving units 30 in the pipe axis direction can be set to a more appropriate value according to the outer diameter of the pipe 80.
[0029]
Next, a second embodiment of the present invention will be described. FIG. 4 is a cross-sectional view illustrating a schematic configuration of a moving body and a wave transmitting / receiving unit of the sensor unit according to the present embodiment. Note that the present embodiment is the same as the first embodiment except for the configuration related to the lock mechanism, and a description of the components other than the lock mechanism will be omitted.
[0030]
In the present embodiment, a regulating member 521 that regulates the downward movement of the wave transmitting and receiving unit 30 is provided in the wave transmitting and receiving unit 30. On the other hand, an escape portion 541 is provided in the moving body 20 to escape the regulation member 521 and release the regulation by the regulation member 521. More specifically, for example, the locking member 341 rotatably supported by the guide rod 36 is provided with a plurality of, for example, two pins, for example, two or more regulating members 521 protruding downward from the lower surface thereof. In addition, the movable body 20, for example, the first member 221 is provided with a relief portion 541, for example, a release hole for releasing the pin 521 by loosely inserting the pin 521 and releasing the regulation by the pin 521.
[0031]
As shown in FIG. 4A, when the regulating member 521 escapes the locking member 341 (that is, when the locking member 341 is located at the rotation position where the pin 521 is loosely inserted into the release hole 541; unlocked state). Since the wave transmitting and receiving unit 30 is urged downward by the spring 42, the wave transmitting and receiving unit 30 (the wave transmitting and receiving unit main body 32) is pressed against the surface of the pipe. On the other hand, as shown in FIG. 4B, when the regulating member 521 is regulated by the first member 221 (that is, when the locking member 341 is not at the rotation position where the pin 521 is loosely inserted into the release hole 541; locked state). ), The lower end of the pin 521 is in contact with the upper surface of the first member 221, whereby the downward movement of the wave transmitting / receiving section 30 is restricted, and the wave transmitting / receiving section 30 (wave transmitting / receiving section main body 32) is connected to the pipe 80. The wave transmitting and receiving unit 30 is held at an upper position before the contact, so that the wave transmitting / receiving unit 30 is locked so as not to contact the pipe surface.
[0032]
Next, a third embodiment of the present invention will be described. FIG. 5 is a cross-sectional view illustrating a schematic configuration of a moving body of the sensor unit according to the present embodiment. Note that this embodiment is the same as the first embodiment except for the configuration of the lock mechanism, and a description of components other than the lock mechanism will be omitted.
[0033]
In the first and second embodiments, the regulating members 52 and 521 for regulating the downward movement of the wave transmitting / receiving unit 30 are provided. However, in the present embodiment, the vertical direction of the wave transmitting / receiving unit 30 with respect to the moving body 20 is provided. The locking position is changed. More specifically, a male thread 362a is provided on the guide rod 362, and a female thread 342a is provided on the locking member 342, and these are screwed together. In the present embodiment, the locking position of the wave transmitting and receiving unit 30 with respect to the moving body 20 is the lower surface of the locking member 342. When the locking member 342 is rotated in the screwing direction, the guide rod 362 and the wave transmitting / receiving section main body 32 rise, and the wave transmitting / receiving section 30 (the wave transmitting / receiving section main body 32) does not contact the pipe surface (FIG. 5). (B)) On the contrary, when the locking member 342 is rotated in the loosening direction of the screw, the guide rod 362 and the main body of the wave transmitting / receiving section 30 are lowered, and the wave transmitting / receiving section 30 (the wave transmitting / receiving section main body 32) is connected to the pipe. It comes into contact with the surface (FIG. 5 (a)).
[0034]
In each of the above embodiments, both of the pair of wave transmitting / receiving sections are freely supported by separate moving bodies so as to freely contact / separate from the pipe surface. Even in a sensor unit in which at least one of the movable units is freely held in contact with / separation from the pipe surface, by providing a lock mechanism for locking the wave transmitting / receiving unit carried by the mobile unit in a state separated from the pipe surface, It is obvious that a similar effect is exerted in the position adjustment of the transmitting / receiving section.
[0035]
【The invention's effect】
As described above, according to the present invention, a lock mechanism is provided for locking the wave transmitting / receiving section to the moving body in a state where the wave transmitting / receiving section is not in contact with the pipe surface. Because it is configured to be free, the flow velocity or flow rate of the pipe can be measured more quickly or more accurately.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a sensor unit for a flow velocity measuring device according to an embodiment of the present invention.
FIG. 2 is a side view (partially sectional view) of a moving body and a wave transmitting / receiving section of the sensor unit for the flow velocity measuring device according to the first embodiment of the present invention.
FIG. 3 is a perspective view of a moving body of the sensor unit for the flow velocity measuring device according to the first embodiment of the present invention.
FIG. 4 is a side view (partially sectional view) of a moving body and a wave transmitting / receiving section of a sensor unit for a flow velocity measuring device according to a second embodiment of the present invention.
FIG. 5 is a side view (partially sectional view) of a moving body and a wave transmitting / receiving section of a sensor unit for a flow velocity measuring device according to a third embodiment of the present invention.
FIG. 6 is an explanatory diagram showing a flow velocity measurement of a fluid in a pipe by transmitting and receiving a wave.
FIG. 7 is a schematic diagram showing propagation of ultrasonic waves in a pipe when pipe diameters are different.
FIG. 8 is a schematic configuration diagram of a conventional sensor unit for a flow velocity measuring device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Sensor unit, 12 support base, 14 long hole (guide part), 20 moving body, 30 wave transmitting / receiving part, 50 lock mechanism, 52,521 pin (restriction member), 54,541 release hole (escape part), 62 Scale, 70 belts, 80 pipes.

Claims (3)

A support base that is removably attached to the pipe surface, and a pair of wave transceiver section in contact with the pipe surface performing wave transmission and reception of to the fluid in the pipe, moves along the axial direction of the pipe to the support base kinematic supported on its own stationary, and a movable body responsible lifting one of the pair of wave transceiver section, at a flow rate measuring dexterity of the sensor unit for measuring the flow rate of the pipe fluid based on transmission and reception of the wave,
The moving body has a configuration that supports the wave transmitting / receiving portion so as to be movable in a substantially radial direction of the pipe, and can be locked to the moving body in a state where the wave transmitting / receiving section is separated from the pipe surface ,
By locking the wave transmitting and receiving unit to the moving body in a state where the wave transmitting and receiving unit is separated from the pipe surface, it is possible to adjust the position of the wave transmitting and receiving unit in the axial direction of the pipe without bringing the wave transmitting and receiving unit into contact with the pipe surface. velocimetry dexterity of the sensor unit, characterized in that the the. A support base detachably mounted on the surface of the pipe, a pair of wave transmitting / receiving sections for transmitting and receiving a wave to and from the fluid in the pipe in contact with the surface of the pipe, and the support base along the axial direction of the pipe; supported on moving self standing, and a moving body that their respective carrying said pair of wave transceiver section, at a flow rate measuring dexterity of the sensor unit for measuring the flow rate of the pipe fluid based on transmission and reception of wave ,
The moving body has a configuration that supports the wave transmitting / receiving portion so as to be movable in a substantially radial direction of the pipe, and can be locked to the moving body in a state where the wave transmitting / receiving section is separated from the pipe surface ,
By locking the wave transmitting and receiving unit to the moving body in a state where the wave transmitting and receiving unit is separated from the pipe surface, it is possible to adjust the position of the wave transmitting and receiving unit in the axial direction of the pipe without bringing the wave transmitting and receiving unit into contact with the pipe surface. velocimetry dexterity of the sensor unit, characterized in that the the. Fluid according to scale readable movement position in the axial direction of the pipe of the wave transceiver unit to be carried on before Symbol mobile, to claim 1 or 2, characterized in that it comprises removably to said supporting base Sensor unit for measuring instruments.

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