Analog sensors and analog sensor systems

Abstract

We provide highly convenient analog sensors and analog sensor systems. [Solution] An analog sensor connected to a converter that performs calculations on measured values ​​is characterized by comprising: a sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used in the calculation of measured values; a memory that holds individual information which is unique to the analog sensor; a first signal line used for inputting and outputting individual information between the converter and the analog sensor; and a second signal line used for inputting and outputting electrical signals between the converter and the analog sensor.

Description

Technical Field

[0001] The present disclosure relates to an analog sensor and an analog sensor system.

Background Art

[0002] Conventional sensor devices such as analyzers and field devices that measure various physical quantities for industrial processes are composed of an analog sensor and a converter. The analog sensor is a detector that converts the measured physical quantity into an electrical signal. Also, the analog sensor transmits and receives necessary electrical signals to and from the converter. The converter calculates a measured value from the received electrical signal and transmits it to a host computer.

[0003] Conventional converters hold individual information such as identification information and calibration values of connected analog sensors, and perform processes such as calculating measured values from electrical signals using the individual information. Therefore, it is assumed that the analog sensor and the converter are used as a fixed pair.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the analog sensor is removed from the converter for calibration or the like and then reconnected, an inconsistency occurs with the previous individual information held by the converter. Therefore, users and the like have to perform operations such as calibration of the analog sensor while the analog sensor is always connected to the same converter, which is a heavy burden.

[0006] The present disclosure has been made in view of the above, and an object thereof is to provide a highly convenient analog sensor. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the analog sensor connected to a converter that performs calculations on measured values ​​includes: a sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used in the calculation of the measured value; a memory that holds individual information which is unique to the analog sensor; a first signal line used for inputting and outputting the individual information between the converter and the analog sensor; and a second signal line used for inputting and outputting the electrical signal between the converter and the analog sensor.

[0008] To solve the above-mentioned problems and achieve the objective, an analog sensor system having a converter and an analog sensor is provided, characterized in that the converter has a calculation unit that calculates a measurement value using the electrical signal of the analog sensor, the analog sensor has a sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used for calculating the measurement value, a memory that holds individual information which is unique information of the analog sensor, a first signal line used for inputting and outputting the individual information between the converter and the analog sensor, and a second signal line used for inputting and outputting the electrical signal between the converter and the analog sensor. [Effects of the Invention]

[0009] This disclosure provides highly convenient analog sensors and analog sensor systems. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 illustrates an example of how to use the analog sensor and converter according to Embodiment 1. [Figure 2] Figure 2 shows an overview of a conventional analog sensor system using an analog sensor and a converter. [Figure 3] Figure 3 shows an example configuration of an analog sensor system using an analog sensor and converter according to Embodiment 1. [Figure 4] Figure 4 is a flowchart showing the processing flow of the converter according to Embodiment 1. [Figure 5] Figure 5 shows an example configuration of an analog sensor system using an analog sensor and converter according to Embodiment 2. [Figure 6] Figure 6 shows an example configuration of an analog sensor system using an analog sensor and converter according to Embodiment 3. [Figure 7] Figure 7 shows an example configuration of an analog sensor system using an analog sensor and converter according to Embodiment 4. [Modes for carrying out the invention]

[0011] Embodiments of the analog sensors and analog sensor systems of this disclosure will be described in detail below with reference to the drawings. However, the invention is not limited by these embodiments. Furthermore, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. Each embodiment can be combined as appropriate within the bounds of consistency.

[0012] <Embodiment 1> Figure 1 illustrates an example of how the analog sensor 100 and converter 200 of this disclosure are used. As shown in Figure 1, the analog sensor 100 is connected to the converter 200 by a signal line for transmitting and receiving individual information such as the identification number of the analog sensor 100 and a signal line for transmitting and receiving electrical signals. The converter 200 calculates the measured value based on the acquired individual information and electrical signals, further converts it into an analog signal such as 4-20mA or a digital communication such as Modbus RTU, and transmits it to a higher-level host 300 such as a control device. The analog sensor 100 is, for example, an analog sensor for process equipment such as a pH sensor for liquid analyzers, or a zirconia oxygen meter for gas analyzers.

[0013] Before describing the analog sensor system of this disclosure, we will first explain the overview and problems of a system using a widely used analog sensor 20.

[0014] (Regarding the system using analog sensor 20) Figure 2 shows an overview of the system using the analog sensor 20. As shown in Figure 2, the system using the analog sensor 20 has an analog sensor 20 and a converter 10, which include detectors for measuring various physical quantities, and these components are separate. The analog sensor 20 and the converter 10 are connected by analog signal lines via a connection part 14 and a detachable part 15.

[0015] The system using the analog sensor 20 converts the physical quantity measured by the detector into an electrical signal of current or voltage and transmits it to the converter 10 via an analog communication line. The converter 10 acquires the electrical signal from the analog signal line from the connection part 14. The calculation unit 13 calculates the measured value from the electrical signal. The individual information function 12 reads the calibration value contained in the individual information 11 and corrects the measured value according to the calibration value. The individual information function 12 also analyzes the degradation diagnosis of the analog sensor 20 contained in the individual information 11 to predict the timing of maintenance.

[0016] Thus, the storage of calibration values ​​and other related functions are handled by the converter 10, not the analog sensor 20. Therefore, the analog sensor 20 is designed to be connected to the converter 10 for measurement.

[0017] (Regarding the problems) In a system using such an analog sensor 20, if the analog sensor 20 is switched to a different converter 10 or reconnected to the converter 10, an inconsistency will occur with the individual information of the previous analog sensor 20 stored in the converter 10. Therefore, if the analog sensor 20 is disconnected from the converter 10, the user will need to reset the individual information of the converter 10. As a result, the user must perform calibration work and diagnostics for preventive maintenance of the analog sensor 20 while it is always connected to the converter 10.

[0018] Further, the converter 10 is a stationary device housed in a heavy and bulky casing. Therefore, the user has to go to the measurement site to perform calibration work and the like. However, generally, the measurement sites of process equipment are often outdoors or on scaffolding where workability is poor, and especially in bad weather or at night, etc., it is a burden on the user.

[0019] Also, in order to cope with a sudden failure of the analog sensor 20, when the spare analog sensor 20 is emergently replaced with the converter 10, the user needs to perform work such as re-calibration at the measurement site, which is complicated. Also, although it is possible for the user to manually transfer individual information such as calibration values to the converter 10, mistakes due to human error may occur.

[0020] Also, in order for the user to reliably manage the individual information of the analog sensor 20 over its life cycle, it is necessary to introduce another system other than the converter 10, and the individual information is accumulated and stored in association with the serial number of the analog sensor 20 in another system.

[0021] As described above, since the analog sensor 20 and the converter 10 are subject to the constraint of being used in a fixed pair, it is inconvenient for the user.

[0022] (Overview of the analog sensor system according to the present disclosure) Therefore, the overview of the analog sensor system of the present disclosure will be described. FIG. 3 is a diagram showing a configuration example of an analog sensor system using the analog sensor 100 and the converter 200 according to Embodiment 1. As shown in FIG. 3, the analog sensor system according to Example 1 is composed of a converter 200 and an analog sensor 100. The converter 200 and the analog sensor 100 are connected by an analog signal line 140 and an individual information communication line 150.

[0023] The converter 200 includes a control unit 210 and a connection unit 220, etc. The analog sensor 100 includes a digital memory element 120, a sensor unit 130, an analog signal line 140, and an individual information communication line 150, etc. The digital memory element 120 is included in the memory of this disclosure. The individual information communication line 150 is included in the first signal line of this disclosure. The analog signal line 140 is included in the second signal line of this disclosure.

[0024] (composition) Next, we will explain the configuration of the analog sensor 100 and the converter 200.

[0025] (Regarding analog sensor 100) The analog sensor 100 includes a digital memory element 120, a sensor unit 130, an analog signal line 140, and an individual information communication line 150, etc.

[0026] The digital memory element 120 records digital information. The digital memory element 120 is, for example, a serial communication EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory).

[0027] For example, the digital memory element 120 stores individual information of the analog sensor 100. This individual information includes calibration values, calibration history, degradation diagnosis information, serial number, etc.

[0028] Calibration values ​​are values ​​used to correct measured values ​​when calculating measured values. For example, some analog sensors 100, such as pH meters in liquid analyzers, have a sensor unit 130 that inevitably deteriorates over time due to its design. Therefore, users need to perform periodic calibration to maintain the calibration value for each analog sensor 100 as individual information.

[0029] The calibration history is historical data of past calibration values ​​for the analog sensor 100. For example, since the degree of deterioration of the analog sensor 100 varies depending on the operating environment, the calibration history is kept and used for deterioration diagnosis, etc.

[0030] The degradation diagnosis information is the result of a degradation diagnosis based on the calibration history. For example, the degradation diagnosis information is used to predict the next maintenance timing by analyzing the degradation diagnosis information. The serial number is the manufacturing serial number assigned to the analog sensor 100 at the time of manufacture.

[0031] The sensor unit 130 is an analog circuit for converting the physical quantity to be measured into an electrical signal. The electrical signal converted by the sensor unit 130 is transmitted to the converter 200 via the analog signal line 140.

[0032] The analog signal line 140 is connected to the sensor section 130 of the analog sensor 100 and the detachable section 221 of the converter 200, and transmits the electrical signals necessary for calculating the measured value. The analog signal line 140 is a signal line that matches the electrical signals of the sensor section 130. The dotted line portion of the analog signal line 140 shown in Figure 3 within the analog sensor 100 represents arbitrary electrical wiring inside the analog sensor 100, such as a circuit pattern.

[0033] The individual information communication line 150 is connected to the digital memory element 120 of the analog sensor 100 and the detachable part 221 of the converter 200, and transmits individual information. The individual information communication line 150 is a communication line compatible with the digital memory element 120. The dotted line portion of the individual information communication line 150 inside the analog sensor 100 shown in Figure 3 represents arbitrary electrical wiring inside the analog sensor 100, such as a circuit pattern.

[0034] (Regarding converter 200) The converter 200 includes a control unit 210 and a connection unit 220, etc.

[0035] The connection section 220 connects to the individual information communication line 150 and the analog signal line 140 of the analog sensor 100. The connection section 220 has a complementary structure to the detachment section 221. For example, the connection section 220 is a sensor connection terminal, while the detachment section 221 is a ring terminal or a pin terminal, thus having a complementary structure. To remove the analog sensor 100, it is separated at the detachment section 221.

[0036] The control unit 210 controls the entire transducer 200. The control unit 210 includes an individual information function unit 211 and an arithmetic unit 212, etc. Here, the control unit 210 can be implemented by electronic circuits such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit), or integrated circuits such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

[0037] The individual information function unit 211 performs processing related to individual information. For example, when the converter 200 is started up, the individual information function unit 211 reads the serial number included in the individual information of the digital memory element 120 via the individual information communication line 150 of the analog sensor 100. The individual information function unit 211 then identifies the connected analog sensor 100.

[0038] Furthermore, for example, when the converter 200 is started up, the individual information function unit 211 reads the calibration value contained in the individual information of the digital memory element 120 via the individual information communication line 150 of the analog sensor 100. Then, the individual information function unit 211 initializes the calibration value of the calculation unit 212.

[0039] Furthermore, for example, the individual information function unit 211 reads the calibration history contained in the individual information of the digital memory element 120 via the individual information communication line 150 of the analog sensor 100. The individual information function unit 211 then performs a degradation diagnosis of the analog sensor 100. The individual information function unit 211 diagnoses the degree of degradation of the analog sensor 100 from past calibration values, outputs the diagnosis result to the individual information of the digital memory element 120 via the individual information communication line 150, and stores it as degradation diagnosis information.

[0040] Furthermore, for example, the individual information function unit 211 reads the lifecycle degradation diagnostic information contained in the individual information of the analog sensor 100 via the individual information communication line 150. The individual information function unit 211 then analyzes the degradation diagnostic information and performs degradation prediction processing, such as determining the timing of the next maintenance or replacement, based on past trend values.

[0041] Furthermore, for example, the individual information function unit 211 performs calibration of the analog sensor 100 and outputs the calibration value to the individual information of the digital memory element 120 via the individual information communication line 150 of the analog sensor 100, and stores it as a calibration value.

[0042] The calculation unit 212 calculates the measured value. For example, the calculation unit 212 calculates the measured value using the electrical signal acquired via the analog signal line 140 of the analog sensor 100 and the calibration value.

[0043] (Processing flow of converter 200) Next, an example of the processing procedure by the converter 200 according to Embodiment 1 will be described using Figure 4. Figure 4 is a flowchart showing an example of the flow of acquiring information from the analog sensor 100 according to Embodiment 1. Note that each step in the flowchart shown in Figure 4 can be executed in a different order, and additional or omitted processes may be included.

[0044] The converter 200 requests data acquisition from the analog sensor 100 (S1; YES). For example, before measuring the object, the converter 200 requests data acquisition from the analog sensor 100 regarding calibration values ​​and electrical signals. Specifically, the converter 200 requests data acquisition from the analog sensor 100 when it starts up or when it is connected to the analog sensor 100. If the converter 200 does not request data acquisition from the analog sensor 100, it repeats the process until it requests it (S1; NO).

[0045] Then, if the data acquisition request of the converter 200 is a request to acquire individual information (S2; YES), the converter 200 acquires individual information from the analog sensor 100 via the individual information communication line 150 (S3). For example, the individual information function unit 211 of the converter 200 accesses the individual information contained in the digital memory element 120 via the individual information communication line 150 of the analog sensor 100. The individual information function unit 211 then acquires individual information including calibration values, degradation diagnosis information, serial numbers, etc.

[0046] On the other hand, if the data acquisition request of the converter 200 is for a measured value rather than for individual information acquisition (S2:NO), the converter 200 acquires an electrical signal from the analog sensor 100 via the analog signal line 140 (S4). For example, the calculation unit 212 of the converter 200 acquires an electrical signal corresponding to the measured value measured by the analog sensor 100 from the sensor unit 130 via the analog signal line 140. For example, the individual information function unit 211 initializes the calibration value of the calculation unit 212 based on the acquired calibration value. The calculation unit 212 calculates the measured value of the object using the acquired electrical signal and the initialized calibration value.

[0047] The processes for acquiring individual device information and electrical signals described above may be executed asynchronously or in parallel. For example, electrical signals may be acquired periodically at intervals such as 100ms, while individual device information may be acquired during events such as startup or calibration.

[0048] (effect) As described above, the analog sensor 100 retains its own individual information. The converter 200 acquires the individual information of the analog sensor 100 from the analog sensor 100. As a result, the converter 200 and the analog sensor 100 are freed from the correspondence constraints that existed between the conventional converter 10 and the conventional analog sensor 20.

[0049] By eliminating the constraints on the correspondence between the converter 200 and the analog sensor 100, users can remove the analog sensor 100 from the converter 200 and perform calibration, degradation diagnosis, etc., on the converter 200 installed in a safe location away from the work site. This significantly reduces the burden on the user.

[0050] Furthermore, users can prepare a pre-calibrated analog sensor 100 as a spare. In the event of a sudden failure, the user can simply attach this analog sensor 100 to the converter 200, and measurements can be taken with the correct individual information. This eliminates the need for cumbersome tasks such as recalibration and manual transfer of individual information that would otherwise be performed at the measurement site to deal with sudden failures, thus preventing human error.

[0051] Furthermore, the analog sensor 100 can accurately store individual sensor information throughout its lifecycle. This eliminates the need for users to introduce external systems, leading to cost reductions.

[0052] Furthermore, the analog sensor 100 can continuously accumulate degradation diagnostic information and other data contained in its individual information throughout its lifecycle. This allows users to understand maintenance timing and other relevant details more accurately.

[0053] Furthermore, each analog sensor 100 retains individual information. This allows users and manufacturers to constantly monitor the operating status of each analog sensor 100. Manufacturers can provide users with automated inventory management services for spare parts, ensuring reliable operation without errors such as misidentification of analog sensors 100.

[0054] Furthermore, the analog sensor 100 can now retain individual information. This allows the converter 200 to individually identify the analog sensor 100. By utilizing this function, it becomes possible to add a function to the converter 200 that requests license authentication from the analog sensor 100 as an individual information function. This allows manufacturers to adopt sales strategies that favor their own analog sensor 100.

[0055] On the other hand, digital sensors can be used without the conventional converter 200, and maintenance work such as calibration can be performed in a safe location. However, digital sensors are expensive because they are equipped with integrated circuits that perform advanced digital processing, such as a calculation unit that calculates the measured values ​​and a digital communication unit that enables digital communication with the outside world. Also, since digital sensors are calibrated without using the converter 200, it is necessary to prepare the environment and equipment for performing calibration. Therefore, the transition from analog sensors 20 to digital sensors is hindered by high initial investment. Furthermore, because digital sensors contain integrated circuits, they must be used with consideration for electrical noise and other factors.

[0056] Therefore, the analog sensor 100 of this disclosure internally stores individual information and provides this information to the converter 200 via a dedicated signal line. As a result, the analog sensor 100 eliminates the above-mentioned constraints between the conventional converter 10 and the conventional analog sensor 20, enabling maintenance and other work to be performed in a safe location. This eliminates the need for users to migrate to expensive digital sensors or to make initial investments in equipment and other items associated with the introduction of digital sensors.

[0057] Furthermore, the manufacturing cost of the analog sensor 100 can be achieved without a significant increase compared to the conventional analog sensor 20. In addition, the analog sensor 100 does not require consideration of electrical noise, and can be widely used in the same environment as the conventional analog sensor 20.

[0058] <Embodiment 2> The analog sensor 100 of this disclosure may also have a detachable part 110 that can be detached from the analog signal line 140 and the individual information communication line 150 while the analog signal line 140 and the individual information communication line 150 are connected to the converter 200.Therefore, Embodiment 2 describes an example in which the analog sensor 100 is equipped with a detachable part 110.

[0059] Figure 5 shows an example configuration of an analog sensor system using the analog sensor 100 and converter 200 according to Embodiment 2. As shown in Figure 5, the analog sensor 100 according to Embodiment 2 differs from the analog sensor 100 according to Embodiment 1 in that it has a detachable part 110. The analog sensor system using the analog sensor 100 and converter 200 according to Embodiment 2 shares components with the analog sensor system according to Embodiment 1. Below, we will describe the configuration of the analog sensor system according to Embodiment 2, which differs from the analog sensor system according to Embodiment 1. Note that the same configuration and processing as in Embodiment 1 will not be described.

[0060] The analog sensor 100 according to Embodiment 2 has a detachable part 110. This allows the user to easily remove the detachable part 110, the digital memory element 120, and the sensor part 130, which constitute the analog sensor 100, from the analog sensor system.

[0061] In this embodiment, the digital memory element 120 and the sensor unit 130 are the main components of the analog sensor 100. The digital memory element 120, which is the main component of the analog sensor 100 in Embodiment 2, is connected from the detachable unit 110 by electrical wiring of any form that can correspond to the individual information communication line 150. The sensor unit 130, which is the main component of the analog sensor 100 in Embodiment 2, is also connected from the detachable unit 110 by electrical wiring of any form that can correspond to the analog signal line 140.

[0062] As shown in Figure 5, the analog sensor 100 has a detachable part 110 that allows the main components of the analog sensor 100 to be detached from the individual information communication line 150 and the analog signal line 140, while the individual information communication line 150 and the analog signal line 140 are connected to the converter 200.

[0063] The detachable section 110 detaches the main components of the analog sensor 100 from the cable. For example, the detachable section 110 has a male and female pin connector structure, such as a VarioPin, and is designed to be detachable without tools. This allows the user to detach the main components of the analog sensor 100 (digital memory element 120, sensor unit 130) from the analog signal line 140 and the individual information communication line 150, along with the detachable section 110, while the analog signal line 140 and the individual information communication line 150 are connected to the converter 200.

[0064] In other words, the user can carry the detachable part 110 and the main components of the analog sensor 100 without separating them. Furthermore, when the main components of the analog sensor 100 are detached together with the detachable part 110, only the analog signal line 140 and the individual information communication line 150 remain connected to the converter 200.

[0065] The detachable part 221 of the converter 200 is made up of screw terminals, making it difficult to attach and detach the analog sensor 100, and there was room for improvement. As described above, by providing the detachable part 110 on the analog sensor 100, the user can easily attach and detach the main components of the analog sensor 100, improving work efficiency.

[0066] <Embodiment 3> By the way, in Embodiment 2, an example was described in which the analog sensor 100 is equipped with a detachable part 110, but the embodiment is not limited to this, and the digital memory element 120 of the analog sensor 100 of Embodiment 1 can be provided inside the detachable part 110. Therefore, Embodiment 3 will describe a configuration in which the digital memory element 120 is provided inside the detachable part 110.

[0067] Figure 6 shows an example configuration of an analog sensor system using an analog sensor 100 and a converter 200 according to Embodiment 3. The analog sensor system according to Embodiment 3 will now be described. As shown in Figure 6, the converter 200 has the same configuration as described in Embodiment 1. On the other hand, the analog sensor 100 is configured with a detachable part 110 and a sensor part 130 separated, and the detachable part 110 and the sensor part 130 are connected by an analog signal line 140. The detachable part 110 is set in the middle of the analog signal line 140 that connects the converter 200 and the sensor part 130. The same configurations and processes as in Embodiments 1 and 2 will not be described.

[0068] As shown in Figure 6, the digital memory element 120, which is the main component of the analog sensor 100 according to Embodiment 3, is connected to the inside of the detachable part 110 by electrical wiring of any form that can correspond to the individual information communication line 150. Furthermore, the sensor part 130, which is the main component of the analog sensor 100 according to Embodiment 3, is connected to the detachable part 110 by electrical wiring of any form that can correspond to the analog signal line 140 inside the detachable part 110 and the analog signal line 140. Note that the main component of the analog sensor 100 is fixed via the detachable part 110.

[0069] The attachment / detachment section 110 of the analog sensor 100 includes a digital memory element 120 connected by electrical wiring of any configuration that can correspond to the individual information communication line 150, and electrical wiring of any configuration that can correspond to the analog signal line 140.

[0070] With this configuration, the user can connect the analog signal line 140 and the individual information communication line 150 to the converter 200, and then detach the main components of the detachable unit 110 and the analog sensor 100 from the analog signal line 140 and the individual information communication line 150.

[0071] In other words, the user can carry the main components of the analog sensor 100 together with the detachable part 110. Furthermore, when the main components of the analog sensor 100 are removed together with the detachable part 110, only the analog signal line 140 and the individual information communication line 150 remain connected to the converter 200.

[0072] Embodiments 1 and 2 remove the constraints on the correspondence between the converter 200 and the analog sensor 100 by adding a digital memory element 120 to the detector. However, modifying the structure of an existing detector may be difficult for reasons such as ensuring the performance of the analog sensor 100.

[0073] On the other hand, in Embodiment 3, the constraint on the correspondence between the converter 200 and the analog sensor 100 is removed by adding the digital memory element 120 to the detachable part 110 instead of the detector. Therefore, even if it is not possible to achieve this in Embodiment 1 or Embodiment 2, Embodiment 3 makes it possible to remove the constraint on the correspondence between the conventional converter 10 and the conventional analog sensor 20.

[0074] <Embodiment 4> By the way, in Embodiment 3, an example was described in which a digital memory element 120 is provided on the detachable part 110 of the analog sensor 100. However, the invention is not limited to this, and it is also possible to provide a non-detachable part 160 between the detachable part 110 and the sensor part 130 that constitute the analog sensor 100. Therefore, Embodiment 4 will describe a configuration in which a non-detachable part 160 is provided on the analog sensor 100.

[0075] Figure 7 shows an example configuration of an analog sensor system using the analog sensor 100 and converter 200 according to Embodiment 4. The analog sensor system according to Embodiment 4 will now be described. As shown in Figure 7, the converter 200 has the same configuration as described in Embodiment 1. On the other hand, the analog sensor 100 is configured with a detachable part 110, a non-detachable part 160, and a sensor part 130 separated. The analog sensor 100 of Embodiment 4 and the analog sensor 100 of Embodiment 3 differ in the configuration of the detachable part 110 and the presence of a non-detachable part 160. The same configurations and processes as in Embodiments 1 to 3 will not be described.

[0076] The digital memory element 120, which is the main component of the analog sensor 100, is provided in the non-detachable part 160. As shown in Figure 7, the digital memory element 120 is connected from the detachable part 110 by electrical wiring of any form that can correspond to the individual information communication line 150 inside the detachable part 110, the individual information communication line 150, and electrical wiring of any form that can correspond to the individual information communication line 150 inside the non-detachable part 160.

[0077] As shown in Figure 7, the sensor unit 130, which is the main component of the analog sensor 100, is connected to the detachable unit 110 by electrical wiring of any form that corresponds to the analog signal line 140 inside the detachable unit 110, the analog signal line 140, and electrical wiring of any form that corresponds to the analog signal line 140 inside the non-detachable unit 160, and the analog signal line 140.

[0078] The detachable section 110 has a structure that allows it to be detached from the individual information communication line 150 and the analog signal line 140. Furthermore, the inside of the detachable section 110 has electrical wiring in any configuration that can correspond to each of the communication lines, the individual information communication line 150 and the analog signal line 140. The analog sensor 100 is connected by attaching the detachable section 110 to the individual information communication line 150 and the analog signal line 140, which are connected to the converter 200.

[0079] The non-detachable section 160 has a digital memory element 120 connected by an arbitrary configuration of electrical wiring corresponding to the individual information communication line 150, and an arbitrary configuration of electrical wiring compatible with the analog signal line 140. The non-detachable section 160 can be provided at any location that is removable together with the detachable section 110. The non-detachable section 160 is connected to the detachable section 110 via the individual information communication line 150 and the analog signal line 140. The non-detachable section 160 is also connected to the sensor section 130 via the analog signal line 140. The non-detachable section 160 is connected to the individual information communication line 150 from the detachable section 110 and is connected to the digital memory element 120 by electrical wiring in an arbitrary configuration compatible with the individual information communication line 150. The non-detachable section 160 may consist only of the digital memory element 120 connected by an arbitrary configuration of electrical wiring corresponding to the individual information communication line 150.

[0080] The main components of the analog sensor 100 are fixed by a detachable part 110 and a non-detachable part 160. However, if the non-detachable part 160 consists only of a digital memory element 120, the main components of the analog sensor 100 are fixed by the detachable part 110.

[0081] With this configuration, the user can connect the analog signal line 140 and the individual information communication line 150 to the converter 200, and then detach the main components of the analog sensor 100 together with the detachment unit 110 from the analog signal line 140 and the individual information communication line 150.

[0082] In other words, the user can carry the main components of the analog sensor 100 together with the detachable part 110. Furthermore, when the main components of the analog sensor 100 are removed together with the detachable part 110, only the analog signal line 140 and the individual information communication line 150 remain connected to the converter 200.

[0083] In Embodiment 4, a digital memory element 120 is provided in the non-detachable part 160. This eliminates the above-mentioned constraints between the conventional converter 10 and the conventional analog sensor 20 without requiring any structural changes to the detector and detachable part 110 of the analog sensor 100.

[0084] The functions and features described in the above embodiment are merely examples and can be modified as needed. Furthermore, the described processing flow can also be modified as appropriate, within a consistent scope.

[0085] 〔system〕 Unless otherwise specified, the processing procedures, control procedures, specific names, and various data and parameters shown in the above documents and drawings may be changed at will.

[0086] Furthermore, the components of each illustrated device are functionally conceptual and do not necessarily need to be physically configured as shown. In other words, the specific forms of distribution and integration of each device are not limited to those shown. That is, all or part of them can be functionally or physically distributed and integrated in any unit according to various loads and usage conditions.

[0087] Furthermore, each processing function performed by each device may be implemented, in whole or in part, by a CPU and a program executed for analysis by that CPU, or by hardware using wired logic.

[0088] Furthermore, the analog sensor 100 can also be equipped with multiple digital memory elements 120 as needed.

[0089] (others) Some examples of the combinations of technical features that will be disclosed are listed below.

[0090] (1) An analog sensor connected to a converter that performs calculations of measured values, comprising: a sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used in the calculation of the measured value; a memory that holds individual information which is unique information of the analog sensor; a first signal line used for inputting and outputting the individual information between the converter and the analog sensor; and a second signal line used for inputting and outputting the electrical signal between the converter and the analog sensor.

[0091] (2) The analog sensor according to (1), further comprising a detachable unit having a structure that allows it to be detached together with the sensor unit from the first signal line and the second signal line, wherein the detachable unit has the memory, the first signal line connects the converter and the memory of the detachable unit, and the second signal line connects the converter and the sensor unit via electrical wiring routed inside the detachable unit.

[0092] (3) The analog sensor according to (1), further comprising a non-detachable part having the memory, and a detachable part having a structure that allows it to be detached together with the non-detachable part and the sensor part from the first signal line and the second signal line, wherein the first signal line connects the converter and the memory of the non-detachable part via electrical wiring wired inside the detachable part, and the second signal line connects the converter and the sensor part via electrical wiring wired inside the detachable part and electrical wiring wired inside the non-detachable part.

[0093] (4) An analog sensor system having a converter and an analog sensor, wherein the converter has a calculation unit that calculates a measurement value using the electrical signal of the analog sensor, and the analog sensor has a sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used for calculating the measurement value, a memory that holds individual information which is unique information of the analog sensor, a first signal line used for inputting and outputting the individual information between the converter and the analog sensor, and a second signal line used for inputting and outputting the electrical signal between the converter and the analog sensor.

[0094] (5) The analog sensor system according to (4), wherein the converter further comprises an individual information function unit that performs processing via the individual information, the individual information function unit acquires the individual information from the analog sensor using the first signal line, and the calculation unit acquires the electrical signal from the analog sensor using the second signal line.

[0095] (6) The analog sensor system according to (5), wherein the individual information function unit acquires calibration values ​​included in the individual information from the first signal line and initializes the calibration values ​​used in the calculation of the measured values ​​by the calculation unit.

[0096] (7) The analog sensor system according to (5) or (6), wherein the individual information function unit acquires calibration history included in the individual information from the first signal line and diagnoses the deterioration of the analog sensor using the calibration history.

[0097] (8) The analog sensor system according to any one of (5) to (7), wherein the individual information function unit performs calibration of the analog sensor and calculates a calibration value, and writes the calculated calibration value to the memory of the analog sensor through the first signal line. [Explanation of Symbols]

[0098] 10 Converters 11 Individual Information 12 Individual Information Function 13 Arithmetic section 14 Connection part 15 Detachment part 20 Analog Sensors 100 Analog Sensors 120 Digital Memory Elements 130 Sensor section 140 Analog signal lines 150 Individual Information Communication Lines 160 Non-detachable part 200 Converters 210 Control Unit 211 Individual Information Function Unit 212 Arithmetic section 220 Connection part 221 Detachment section Top 300 Hosts

Claims

1. In an analog sensor connected to a converter that performs calculations on measured values, A sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used in the calculation of the measured value, A memory that holds individual information which is unique information of the analog sensor, A first signal line used for inputting and outputting the individual information is provided between the converter and the analog sensor. A second signal line used for inputting and outputting the electrical signal is provided between the converter and the analog sensor. An analog sensor characterized by having the following features.

2. The system further includes a detachable part that is detachable from the first signal line and the second signal line together with the sensor unit, The detachable part has the memory, The first signal line connects the converter and the memory of the detachable unit. The second signal line connects the converter and the sensor unit via electrical wiring routed inside the detachable unit. The analog sensor according to feature 1.

3. The non-removable part having the memory, The device further includes a detachable part that is detachable from the first signal line and the second signal line together with the non-detachable part and the sensor part, The first signal line connects the converter and the memory of the non-detachable part via electrical wiring routed inside the detachable part. The second signal line connects the converter and the sensor unit via electrical wiring routed inside the detachable part and electrical wiring routed inside the non-detachable part. The analog sensor according to feature 1.

4. In an analog sensor system having a converter and an analog sensor, The aforementioned converter is It has a calculation unit that calculates a measurement value using the electrical signal of the analog sensor, The aforementioned analog sensor is A sensor unit that measures a physical quantity and converts the physical quantity into an electrical signal used in the calculation of the measured value, A memory that holds individual information which is unique information of the analog sensor, A first signal line used for inputting and outputting the individual information is provided between the converter and the analog sensor. A second signal line used for inputting and outputting the electrical signal is provided between the converter and the analog sensor. An analog sensor system characterized by having the following features.

5. The converter further comprises an individual information function unit that performs processing via the individual information, The aforementioned individual information function unit is: The individual information is obtained from the analog sensor using the first signal line. The aforementioned arithmetic unit, The electrical signal is acquired from the analog sensor using the second signal line. The analog sensor system according to feature 4.

6. The individual information function unit acquires calibration values ​​included in the individual information from the first signal line and initializes the calibration values ​​used in the calculation of the measured values ​​by the calculation unit. The analog sensor system according to claim 5, characterized in that it is as described above.

7. The individual information function unit acquires the calibration history included in the individual information from the first signal line and diagnoses the deterioration of the analog sensor using the calibration history. The analog sensor system according to claim 5, characterized in that it is as described above.

8. The individual information function unit performs calibration of the analog sensor and calculates a calibration value, and writes the calculated calibration value to the memory of the analog sensor via the first signal line. The analog sensor system according to claim 5, characterized in that it is as described above.

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