Measuring device, measurement system, and control method for a measuring device

Abstract

To easily acquire measurement data.SOLUTION: A measuring device 10 according to the present disclosure includes: a measurement target unit 101 for receiving the physical quantity of a measurement target; a power source circuit 11 for receiving supply of power from a communication apparatus 20 wirelessly according to approach of the communication apparatus 20; a wireless communication unit 12 for performing a short-distance wireless communication with the communication apparatus 20 according to the approach of the communication apparatus 20; and a signal generation unit 17, driven by power supplied from the power source circuit 11 and generating a signal which shows the measurement data of the physical quantity that the measurement target unit 101 received, the wireless communication unit 12 sending a signal generated by the signal generation unit 17 to the communication apparatus 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a measuring device, a measurement system, and a control method for a measuring device.

Background Art

[0002] Among measuring devices for measuring physical quantities, there are some that include a mechanical indicator that indicates a measured value by a mechanical operation according to the measured physical quantity. Further, Patent Document 1 discloses a measuring device including a data communication device that wirelessly transmits measurement data such as pressure in order to acquire measurement data such as pressure at a location where access is difficult, and a power source (battery) that drives the data communication device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a measuring device including a mechanical indicator, it is necessary to manually confirm the measured value and input the measurement data to a management device that manages the measurement data, which is time-consuming. Further, in the measuring device disclosed in Patent Document 1, in order to continuously acquire measurement data, the labor and cost of battery replacement are incurred.

[0005] An object of the present disclosure made in view of the above problems is to provide a measuring device, a measurement system, and a control method for a measuring device that can easily acquire measurement data.

Means for Solving the Problems

[0006] A measuring device according to some embodiments includes a measured part that receives a physical quantity of a measurement target, a power supply circuit that receives power supply from the external device by wireless power supply in response to the approach of the external device, a wireless communication part that performs short-range wireless communication with the external device in response to the approach of the external device, and a signal generation part that is driven by the power supplied to the power supply circuit and generates a signal indicating measurement data of the physical quantity received by the measured part. The wireless communication part transmits the signal generated by the signal generation part to the external device. According to a measuring device having such a configuration, by a simple operation of bringing the external device closer to the measuring device, the measurement data of the measuring device is transmitted to the external device, so that the measurement data can be easily acquired.

[0007] In one embodiment, the measuring device further includes a mechanical indicator that indicates, as a value indicating the physical quantity, a displacement corresponding to the physical quantity received by the measured part by a mechanical operation. The signal generation part includes a gauge sensor that outputs a voltage corresponding to the displacement, a voltage measurement circuit that measures the voltage output from the gauge sensor, and an arithmetic circuit that generates the signal based on the voltage measured by the voltage measurement circuit. With such a configuration, the physical quantity received by the measured part can be measured and indicated without power by the mechanical indicator, and the measurement data can be transmitted to the external device.

[0008] In one embodiment, the wireless communication part performs short-range wireless communication with the external device by a communication method according to the NFC (Near Field Communication) standard. With such a configuration, the measurement data can be acquired using a general-purpose device capable of communication by a communication method according to the NFC communication standard.

[0009] In one embodiment, the signal generation part includes a non-volatile memory part, and stores the information transmitted from the external device via the wireless communication part in the non-volatile memory part. With such a configuration, various information can be stored in the non-volatile memory part, so that the convenience can be improved.

[0010] Measurement systems according to some embodiments include a measuring device, an external device capable of supplying power to the measuring device and communicating with the measuring device in response to approaching the measuring device, and a management device for managing measurement data of the measuring device. The measuring device includes a measured part for receiving a physical quantity, a power supply circuit for receiving power supply from the external device by wireless power supply in response to the approach of the external device, a wireless communication part for performing short-range wireless communication with the external device in response to the approach of the external device, and a signal generation part driven by the power supplied to the power supply circuit and generating a signal indicating measurement data of the physical quantity received by the measured part. The wireless communication part transmits the signal generated by the signal generation part to the external device, and the external device transmits the signal transmitted from the measuring device to the management device via a network. According to a measurement system having such a configuration, by a simple operation of bringing an external device close to the measuring device, measurement data of the measuring device is transmitted to the external device, so that the measurement data can be easily acquired and transmitted to the management device.

[0011] A control method for a measuring device according to some embodiments is a control method for a measuring device including a measured part for receiving a physical quantity, and includes steps of receiving power supply from the external device by wireless power supply in response to the approach of the external device, generating a signal indicating measurement data of the physical quantity received by the measured part when receiving the power supply, and transmitting the generated signal to the external device by wireless communication. According to a control method having such a configuration, by a simple operation of bringing an external device close to the measuring device, measurement data of the measuring device is transmitted to the external device, so that the measurement data can be easily acquired.

Advantages of the Invention

[0012] According to the measuring device, measurement system, and control method for a measuring device according to the present disclosure, measurement data can be easily acquired.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 10

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the drawings. In each figure, the same reference numerals indicate the same or equivalent components.

[0015] First, for comparison, with reference to FIG. 8, a configuration example of a measuring device 100 according to a comparative example will be described.

[0016] The measuring device 100 shown in FIG. 8 includes a measured part 101, a physical quantity-displacement conversion part 102, a displacement-indication conversion part 103, and a mechanical indicator 104.

[0017] The measured part 101 receives the physical quantity to be measured, such as vibration, temperature, or pressure. For example, when the physical quantity to be measured is pressure, the measured part 101 has the pressure of the object to be measured applied to it.

[0018] The physical quantity-displacement conversion part 102 is displaced according to the physical quantity received by the measured part 101.

[0019] The displacement-indication conversion part 103 converts the displacement of the physical quantity-displacement conversion part 102 into the indication value of the mechanical indicator 104 and causes the mechanical indicator 104 to indicate it.

[0020] The mechanical indicator 104 operates mechanically according to the indication value from the displacement-indication conversion part 103 and indicates the physical quantity received by the measured part 101. That is, the physical quantity received by the measured part 101 is output as the measured value (measurement data) of the measuring device 100 by the mechanical indicator 104.

[0021] Figure 9 is a flowchart showing the operation of the measuring device 100 shown in Figure 8.

[0022] When the measured part 101 receives a physical quantity, the measuring device 100 starts operating.

[0023] The physical quantity-displacement conversion part 102 is displaced according to the physical quantity received by the measured part 101 (step S101). That is, the physical quantity-displacement conversion part 102 converts the physical quantity received by the measured part 101 into displacement by the physical quantity-displacement conversion part 102.

[0024] The displacement-indication conversion part 103 converts the displacement of the physical quantity-displacement conversion part 102 into the indication value of the mechanical indicator 104 (step S102). The mechanical indicator 104 indicates the received physical quantity as measurement data by mechanically indicating the indication value (step S103). Thus, according to the measuring device 100 shown in Figure 8, the measurement of the physical quantity and the display of the measured physical quantity can be performed without power.

[0025] FIG. 10 is a diagram for explaining the acquisition of measurement data of the measuring device 100.

[0026] When acquiring the measurement data of the measuring device 100, as shown in FIG. 10, an operator 200 visually confirms the measured value of the physical quantity displayed on the mechanical indicator 104 of the measuring device 100 (operation A). Next, the operator 200 records the confirmed measured value on a recording medium 300 (for example, paper) that can be used at the site where the measuring device 100 is installed (operation B). Then, the operator 200 inputs the measurement data recorded on the recording medium 300 into a management device 400 that manages the measurement data (operation C).

[0027] As described above, in the measuring device 100, in order to acquire measurement data, a plurality of operations by the operator 200, such as the above-described operations A-C, are required, which is time-consuming. In addition, since it involves manual operation, there is also a possibility of human error.

[0028] Next, with reference to FIG. 1, a configuration example of the measuring device 10 according to an embodiment of the present disclosure will be described. FIG. 1 is a diagram showing a configuration example of a measurement system 1 including the measuring device 10 according to the present embodiment. In FIG. 1, the same components as those in FIG. 8 are denoted by the same reference numerals, and the description thereof is omitted. The measuring device 10 according to the present embodiment communicates with a communication device 20 which is an external device.

[0029] The measurement system 1 shown in FIG. 1 includes a measurement device 10 and a communication device 20.

[0030] The measuring device 10 is installed, for example, in a plant, measures various physical quantities such as vibration, temperature, or pressure, and outputs measurement data. The plant where the measuring device 10 is installed is, for example, an industrial plant such as a chemical plant, a plant that manages and controls the wellhead or its vicinity such as a gas field and an oil field, a plant that manages and controls power generation such as hydraulic power, thermal power, and nuclear power, a plant that manages and controls environmental power generation such as solar power and wind power, and a plant that manages and controls water supply and drainage, dams, and the like.

[0031] The communication device 20 is a wireless communication device capable of wireless power supply and short-distance (e.g., several cm - several m) wireless communication with other devices by, for example, an electromagnetic induction method using electromagnetic induction or an electromagnetic field resonance method using the resonance phenomenon of an electromagnetic field. Specific examples of the communication device 20 include, for example, smartphones, tablet terminals, and the like.

[0032] Next, the configuration of the measuring device 10 according to the present embodiment will be described.

[0033] The measuring device 10 shown in FIG. 1 includes a measured portion 101, a physical quantity-displacement conversion portion 102, a displacement-indication conversion portion 103, a mechanical indicator 104, a power supply circuit 11, a wireless communication portion 12, a bridge circuit 13, a voltage measurement circuit 15, and an arithmetic circuit 16. That is, the measuring device 10 according to the present embodiment further includes a power supply circuit 11, a wireless communication portion 12, a bridge circuit 13, a voltage measurement circuit 15, and an arithmetic circuit 16 as compared with the measuring device 100 shown in FIG. 8. Note that the voltage measurement circuit 15 and the arithmetic circuit 16 may be configured from an analog circuit, a digital circuit, a processor, or the like.

[0034] The power supply circuit 11 receives power supply from the communication device 20 by wireless power supply in response to the approach of the communication device 20. The power supply circuit 11 supplies the power supplied from the communication device 20 to the wireless communication portion 12, the bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16. The bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 are not driven when not powered by the power supply circuit 11, and are driven in response to the power supply from the power supply circuit 11 to perform the operations described later.

[0035] The wireless communication portion 12 performs short-distance wireless communication with the communication device 20 in response to the approach of the communication device 20.

[0036] The bridge circuit 13 is, for example, a circuit (Wheatstone bridge circuit) configured such that a first series body in which a gauge sensor 14 and a resistor are connected in series and a second series body in which two resistors are connected in series are connected in parallel. The gauge sensor 14 deforms according to the displacement of the physical quantity-displacement conversion unit 102 and outputs a voltage corresponding to the deformation. The bridge circuit 13 outputs the voltage output from the gauge sensor 14 as an output voltage. As described above, the physical quantity-displacement conversion unit 102 is displaced according to the physical quantity received by the measurement target unit 101. The gauge sensor 14 deforms according to the displacement of the physical quantity-displacement conversion unit 102 and outputs a voltage corresponding to the deformation. Therefore, the output voltage of the bridge circuit 13 corresponds to the physical quantity received by the measurement target unit 101.

[0037] The voltage measurement circuit 15 measures the output voltage of the bridge circuit 13, that is, the voltage output from the gauge sensor 14.

[0038] Based on the voltage measured by the voltage measurement circuit 15, the arithmetic circuit 16 generates a signal indicating measurement data of the physical quantity received by the measurement target unit 101 and transmits the generated signal to the communication device 20 via the wireless communication unit 12. For example, the arithmetic circuit 16 generates a signal indicating the measurement data of the measurement target unit 101 based on a predetermined relationship between the physical quantity received by the measurement target unit 101 and the output voltage of the bridge circuit 13 corresponding to the physical quantity.

[0039] The bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 constitute a signal generation unit 17. As described above, the bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 are driven according to the power supply from the power supply circuit 11. Therefore, the signal generation unit 17 is driven by the power supplied from the power supply circuit 11 and generates a signal indicating the measurement data of the physical quantity received by the measurement target unit 101. Then, the wireless communication unit 12 transmits the signal generated by the signal generation unit 17 to the communication device 20.

[0040] In the measuring device 10 according to the present embodiment, by bringing the communication device 20 closer to the measuring device 10, power is supplied from the communication device 20 to the measuring device 10. With the supplied power, measurement data is generated, and the generated measurement data is transmitted from the measuring device 10 to the communication device 20. Therefore, for example, an operator can obtain the measurement data of the measuring device 10 by performing a simple operation of bringing the communication device 20 closer to the measuring device 10. Further, in the measuring device 10 according to the present embodiment, since power is supplied from the communication device 20 to the measuring device 10, it is not necessary to provide the measuring device 10 with a battery or the like that supplies power for transmitting measurement data. Therefore, measurement data can be obtained without the trouble of replacing the battery or the like. Accordingly, according to the measuring device 10 according to the present embodiment, measurement data can be easily obtained. Further, since the mechanical indicator 104 performs mechanical operations, it does not require power supplied from the communication device 20, that is, it can indicate the physical quantity received by the measured portion 101 without power.

[0041] FIG. 2 is a diagram for explaining the control method of the measuring device 10 according to the present embodiment, and is a flowchart showing an example of the operation of the measuring device 10.

[0042] When the communication device 20 is brought closer to the measuring device 10, the power supply circuit 11 receives power supply from the communication device 20 (step S11). The power supply circuit 11 supplies the power supplied from the communication device 20 to the wireless communication unit 12, the bridge circuit 13 constituting the signal generation unit 17, the voltage measurement circuit 15, and the arithmetic circuit 16 (step S12). By supplying power from the power supply circuit 11, the wireless communication unit 12, the bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 are driven. That is, by supplying power from the power supply circuit 11, the signal generation unit 17 is driven.

[0043] When the physical quantity-displacement conversion unit 102 is displaced according to the physical quantity received by the measured unit 101 while the signal generation unit 17 is driven, the strain gauge sensor 14 deforms according to the displacement of the physical quantity-displacement conversion unit 102 and outputs a voltage corresponding to the deformation. The voltage measurement circuit 15 measures the voltage output from the strain gauge sensor 14 (step S13).

[0044] The arithmetic circuit 16 converts the voltage measured by the voltage measurement circuit 15 into measurement data of the physical quantity (step S14). The measurement data of the physical quantity obtained by the conversion corresponds to the physical quantity received by the measured unit 101. The arithmetic circuit 16 generates a signal indicating the obtained physical quantity, that is, the measurement data of the physical quantity received by the measured unit 101. The wireless communication unit 12 transmits the signal generated by the arithmetic circuit 16 to the communication device 20 by wireless communication (step S15).

[0045] FIG. 3 is a sequence diagram showing an example of the operations of the measuring device 10 and the communication device 20 according to the present embodiment.

[0046] In the measuring device 10, when the measured unit 101 receives a physical quantity, the physical quantity-displacement conversion unit 102 is displaced according to the physical quantity received by the measured unit 101. That is, the physical quantity-displacement conversion unit 102 converts the physical quantity received by the measured unit 101 into displacement (step S21). The strain gauge sensor 14 deforms according to the displacement of the physical quantity-displacement conversion unit 102 (step S22).

[0047] Here, it is assumed that the communication device 20 is brought closer to the measuring device 10, that is, the communication device 20 and the measuring device 10 are in proximity and this state continues to be maintained (step S23).

[0048] When the communication device 20 is close to the measuring device 10, power is supplied from the communication device 20 to the power supply circuit 11 of the measuring device 10 (step S24). The power supply circuit 11 supplies the power supplied from the communication device 20 to the wireless communication unit 12, the bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 (step S25). In response to the power supply from the communication device 20, the wireless communication unit 12, the bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 are driven.

[0049] When the bridge circuit 13 is driven, since the gauge sensor 14 is deformed according to the displacement of the physical quantity-displacement conversion unit 102, it outputs a voltage corresponding to the deformation. The voltage measurement circuit 15 measures the voltage output from the gauge sensor 14. The arithmetic circuit 16 converts the voltage measured by the voltage measurement circuit 15 into measurement data of the physical quantity (step S26). Then, the arithmetic circuit 16 generates a signal indicating the obtained physical quantity, that is, the measurement data of the measured portion 101, and transmits it to the communication device 20 via the wireless communication unit 12 (step S27).

[0050] The communication device 20 receives the signal transmitted from the measuring device 10 (step S28). Then, the communication device 20 displays the measurement data indicated by the received signal on a display unit provided in the communication device 20 or a display unit connected to the communication device 20 (step S29). Further, the communication device 20 stores the measurement data indicated by the received signal in a storage provided in the communication device 20 (step S30). When the physical quantity received by the measured portion 101 changes while the communication device 20 and the measuring device 10 are in a close state, the processes of steps S26 - S30 are repeated, and the measurement data corresponding to the change is sequentially transmitted to and stored in the communication device 20.

[0051] After measurement data is stored in the communication device 20, it is assumed that the communication device 20 is separated from the measuring device 10. That is, it is assumed that the proximity between the communication device 20 and the measuring device 10 is released, and the communication device 20 is out of the range where short-range wireless communication with the measuring device 10 is possible (step S31). When the proximity between the communication device 20 and the measuring device 10 is released, the power supply from the communication device 20 to the power supply circuit 11 of the measuring device 10 is interrupted (step S32). When the proximity between the communication device 20 and the measuring device 10 is released, the communication device 20 ends communication with the measuring device 10 (step S33). Also, when the power supply from the communication device 20 is interrupted, the wireless communication unit 12, the bridge circuit 13, the voltage measurement circuit 15, and the arithmetic circuit 16 stop operating (step S34).

[0052] In addition, in FIG. 3, an example in which the measurement data of the measuring device 10 is stored in the communication device 20 has been described, but it is not limited to this. For example, the communication device 20 may transmit the measurement data to a management device 30 that manages the measurement data. That is, as shown in FIG. 4, the measurement system 1 may include the measuring device 10, the communication device 20, and the management device 30.

[0053] The management device 30 is, for example, a cloud server connected to the network 31 and is a higher-level device that manages the measurement data of the measuring device 10. The network 31 is various networks such as the Internet, a LAN (Local Area Network), and a VPN (Virtual Private Network), regardless of whether it is wired or wireless.

[0054] The communication device 20 transmits the measurement data acquired from the measuring device 10 to the management device 30 via the network 31. As described above, the communication device 20 is a communication device such as a smartphone or a tablet terminal. Many such communication devices are equipped with a communication function for communicating via a network. The communication device 20 can transmit to the management device 30 via the network 31 by this communication function.

[0055] The power supplied from the communication device 20 to the measurement device 10 is minute power that enables short-distance wireless communication of, for example, about several centimeters to several tens of centimeters. Therefore, it is difficult to directly transmit measurement data from the measurement device 10 to the management device 30 on the network 31. However, as shown in FIG. 4, the measurement data of the measurement device 10 can be transmitted to the management device 30 via the communication device 20.

[0056] The measurement device 10 is, for example, a pressure gauge that measures pressure. When the measurement device 10 is a pressure gauge, as shown in FIG. 5, a Bourdon tube 102a can be used as the physical quantity-displacement conversion unit 102. The Bourdon tube 102a is an arc-shaped tube into which a fluid flows. The Bourdon tube 102a is displaced according to the pressure applied to the inlet (pressure inlet 101a) where the fluid flows, which serves as the measured portion 101.

[0057] Also, when the measurement device 10 is a thermometer, a bimetal (not shown) in which two metal plates with different coefficients of thermal expansion are bonded together can be used as the physical quantity-displacement conversion unit 102. In this case, the bimetal is displaced according to the temperature of the measured portion 101.

[0058] By providing the strain gauge 14 on the Bourdon tube 102a or the bimetal, the strain gauge 14 deforms according to these displacements, and a voltage corresponding to the physical quantity received by the measured portion 101 is output from the strain gauge 14.

[0059] The short-range wireless communication between the measurement device 10 and the communication device 20 can be performed by a communication method conforming to the NFC (Near Field Communication) standard, including, for example, NFC-A, NFC-B, NFC-F, etc., based on the international standard ISO / IEC 18092. In this case, as shown in FIG. 6, the power supply circuit 11 and the wireless communication unit 12 can be constituted by a coil-shaped antenna 11a. Through the electromagnetic induction coupling between the antenna 11a of the measurement device 10 and the antenna of the communication device 20, the communication device 20 can supply power to the measurement device 10. With this power, the wireless communication unit 12 and the signal generation unit 17 (bridge circuit 13, voltage measurement circuit 15, and arithmetic circuit 16) can be driven to generate a signal indicating measurement data. Also, through the electromagnetic induction coupling between the antenna 11a of the measurement device 10 and the antenna of the communication device 20, the measurement device 10 can transmit the generated signal to the communication device 20.

[0060] Currently, among communication devices such as smartphones and tablet terminals, many devices having a function (NFC communication function) of performing communication by a communication method conforming to the NFC standard are in circulation. Therefore, as the communication device 20, a general-purpose device having an NFC communication function instead of a dedicated device can be used.

[0061] As shown in FIG. 7, the signal generation unit 17 of the measurement device 10 may further include a non-volatile memory unit 18. The arithmetic circuit 16 is driven by the power supplied from the communication device 20, and when information is transmitted from the communication device 20 via the wireless communication unit 12, the arithmetic circuit 16 can store the information in the non-volatile memory unit 18. The non-volatile memory unit 18 can retain the stored information even when the power supply from the communication device 20 is interrupted. The information stored in the non-volatile memory unit 18 is, for example, information such as a tag name for identifying the measurement device 10, the acquisition date and time of the previous measurement data, the installation location of the measurement device 10, and the value of the previously acquired measurement data. By transmitting this information from the communication device 20 to the measurement device 10 and storing it in the non-volatile memory unit 18, and, for example, also acquiring the information stored in the non-volatile memory unit 18 when newly acquiring measurement data, it is possible to easily grasp the elapsed time since the acquisition date and time of the previous measurement data. Therefore, the convenience when collecting measurement data can be improved.

[0062] As described above, in this embodiment, the measurement device 10 includes a measured part 101 that receives a physical quantity, a power supply circuit 11 that receives power supply from the communication device 20 by wireless power supply in response to the approach of the communication device 20, which is an external device, a wireless communication unit 12 that performs short-range wireless communication with the communication device 20 in response to the approach of the communication device 20, and a signal generation unit 17 that is driven by the power supplied to the power supply circuit 11 and generates a signal indicating measurement data of the physical quantity received by the measured part 101. Then, the wireless communication unit 12 transmits the signal generated by the signal generation unit 17 to the communication device 20.

[0063] By bringing the communication device 20 closer to the measuring device 10, power is supplied from the communication device 20 to the measuring device 10. With the supplied power, measurement data is generated, and the measurement data is transmitted from the measuring device 10 to the communication device 20. Therefore, for example, an operator can acquire the measurement data of the measuring device 10 with a simple operation of bringing the communication device 20 closer to the measuring device 10. Also, in the measuring device 10 according to the present embodiment, since power is supplied from the communication device 20 to the measuring device 10, there is no need to provide a battery or the like in the measuring device 10 that supplies power for transmitting the measurement data. Therefore, the measurement data can be acquired without the trouble of replacing the battery or the like. Thus, according to the measuring device 10 according to the present embodiment, the measurement data can be easily acquired.

[0064] Although the above-described embodiments have been described as representative examples, it is obvious to those skilled in the art that many changes and substitutions are possible within the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited by the above-described embodiments, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine a plurality of constituent blocks described in the configuration diagrams of the embodiments into one, or to divide one constituent block.

Explanation of Reference Numerals

[0065] 1 Measurement system 10, 100 Measuring device 11 Power supply circuit 11a Antenna 12 Wireless communication unit 13 Bridge circuit 14 Gauge sensor 15 Voltage measurement circuit 16 Arithmetic circuit 17 Signal generation unit 18 Non-volatile memory unit 101 Measured part 101a Pressure inlet 102 Physical quantity-displacement conversion unit 102a Bourdon tube 103 Displacement-indication conversion unit 104 Mechanical indicator 20 Communication device (external device) 30 Management device 31 Network 200 Operator 300 Recording medium 400 Management device

Claims

1. A measuring device installed in a plant, comprising: a measured part that receives a physical quantity to be measured; a power supply circuit that receives power supply from the external device by wireless power supply in response to the approach of the external device; a wireless communication unit that performs short-range wireless communication with the external device in response to the approach of the external device; a signal generation unit that generates a signal indicating measurement data of the physical quantity received by the measured part by the power supplied to the power supply circuit; the signal generation unit includes a gauge sensor, a voltage measurement circuit, and an arithmetic circuit, which are driven by the power supplied to the power supply circuit; the gauge sensor outputs a voltage corresponding to the physical quantity received by the measured part; the voltage measurement circuit measures the voltage output from the gauge sensor; the arithmetic circuit generates the signal based on the voltage measured by the voltage measurement circuit; the wireless communication unit transmits the signal generated by the arithmetic circuit to the external device; the signal generation unit further includes a non-volatile memory unit; when the arithmetic circuit is driven only by the power supplied from the external device, the arithmetic circuit stores the information transmitted from the external device via the wireless communication unit in the non-volatile memory unit; the information is a tag name for identifying the measuring device; the wireless communication unit transmits the information stored in the non-volatile memory unit to the external device together with the signal indicating the measurement data generated by the arithmetic circuit. A measuring device.

2. The measuring device according to claim 1, wherein the information further includes the acquisition date and time of the previous measurement data. A measuring device.

3. The measuring device according to claim 2, wherein it obtains the elapsed time from the acquisition date and time of the previous measurement data to the acquisition date and time of the new measurement data. A measuring device.

4. The measuring device according to claim 2, wherein the information further includes the previous measurement data. A measuring device.

5. In the measuring device according to any one of claims 1 to 4, the information further includes information on the installation location of the measuring device. A measuring device.

6. In the measuring device according to any one of claims 1 to 4, the wireless communication unit performs short-range wireless communication with the external device by a communication method conforming to the NFC (Near Field Communication) standard . A measuring device.

7. In the measuring device according to any one of claims 1 to 4, A measuring device further comprising a mechanical indicator that indicates, as a value indicating the physical quantity, a displacement corresponding to the physical quantity received by the measured part by mechanical operation

8. A measuring device installed in a plant, an external device capable of supplying power to the measuring device and communicating with the measuring device in response to approach to the measuring device, and a management device for managing measurement data of the measuring device, The measuring device is, A measured part that receives a physical quantity, A power supply circuit that receives power supply from the external device by wireless power supply in response to approach of the external device, A wireless communication unit that performs short-range wireless communication with the external device in response to approach of the external device, A signal generation unit that generates a signal indicating measurement data of the physical quantity received by the measured part by the power supplied to the power supply circuit, The signal generation unit includes a gauge sensor, a voltage measurement circuit, and an arithmetic circuit that are driven by the power supplied to the power supply circuit, The gauge sensor outputs a voltage corresponding to the physical quantity received by the measured part, The voltage measurement circuit measures the voltage output from the gauge sensor, The arithmetic circuit generates the signal based on the voltage measured by the voltage measurement circuit, The wireless communication unit transmits the signal generated by the arithmetic circuit to the external device, The signal generation unit further includes a non-volatile memory unit, When the arithmetic circuit is driven only by the power supplied from the external device, the arithmetic circuit stores the information transmitted from the external device via the wireless communication unit in the non-volatile memory unit, The information is a tag name for identifying the measuring device, The wireless communication unit transmits the information stored in the non-volatile memory unit to the external device together with the signal indicating the measurement data generated by the arithmetic circuit, The external device transmits the signal transmitted from the measuring device to the management device via a network, and includes a display unit that displays the measurement data indicated by the signal transmitted from the measuring device. A measurement system.

9. A control method for a measuring device installed in a plant, comprising a measured part that receives a physical quantity, comprising: Receiving power supply from the external device by wireless power supply in response to approach of the external device; Generating a signal indicating measurement data of the physical quantity received by the measured part by the supplied power; Transmitting the generated signal to the external device by wireless communication, The measurement device includes a gauge sensor driven by the power supplied by the wireless power supply, a voltage measurement circuit, and an arithmetic circuit. In the step of generating the signal, The gauge sensor outputs a voltage corresponding to the physical quantity received by the measurement target part. The voltage measurement circuit measures the voltage output from the gauge sensor. The arithmetic circuit generates the signal based on the voltage measured by the voltage measurement circuit. The measurement device further includes a non-volatile memory unit. When the arithmetic circuit is driven only by the power supplied from the external device, the arithmetic circuit stores the information transmitted by the wireless communication from the external device in the non-volatile memory unit. The information is a tag name for identifying the measurement device. A control method for transmitting, to the external device, the information stored in the non-volatile memory unit together with the signal indicating the measurement data generated by the arithmetic circuit.

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