JP2013156912A - Maintenance support system for equipment and equipment maintenance server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a maintenance support system of equipment for easily associating sensors showing the state of equipment with maintenance object equipment when the position of the maintenance object equipment is unclear or under such situations that various sensors showing the state of the maintenance object equipment are not associated with the maintenance object equipment.SOLUTION: A maintenance support system 10 of equipment includes: a sensor 50; predetermined maintenance object equipment; and a matching unit 32 for determining whether or not the sensor 50 is prepared for the maintenance object equipment.

Description

  The present invention relates to a device maintenance support system and a device maintenance server, and more particularly to a device maintenance support system and a device maintenance server capable of easily matching a sensor and a maintenance target device.

  Conventionally, systems for supporting maintenance and the like of devices are disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2004-104375 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2011-44098 (Patent Document 2).

  According to Patent Document 1, position information (latitude / longitude / altitude / direction) is obtained from a device such as GPS, and date / time information is input or obtained from a built-in clock or the like to record the position information and date / time information. On the other hand, an image is taken, position information / date / time information is added to the image, and the image is transmitted to the server. The server receives the image, separates position information and date / time information from the image, organizes the data, and stores it. It discloses a system that links location information and map information to organize and store location information, date and time information, and map information.

  According to Patent Literature 2, a work support device including a mobile terminal device carried by an operator and a work support server installed in a management office is disclosed. The positioning means of the portable terminal device measures the position data indicating the longitude and latitude at which the worker is located and transmits it to the work support server. In the work support server, the determination unit determines whether or not the position data from the portable terminal device is within a predetermined range centered on the position of the inspection location indicated by the inspection coordinate data. If it is within the predetermined range, the position notification means transmits a detection notification to the portable terminal device. The portable terminal device discloses a device that receives a detection notification, generates sound by a sound generation means, and notifies an operator that the inspection point is close.

JP 2004-104375 A JP 2011-44098 A

  A conventional system for supporting maintenance of equipment has been configured as described above. According to Patent Document 1, since information is collected on a server and organized by date information and position information, data can be viewed in time series, and information on a specific area is geographically organized. Can be organized. Organized information is divided according to information disclosure categories (public / non-disclosure) and is also disclosed on the Internet web, so accurate information can be conveyed to many people. On the other hand, according to Patent Document 2, if the position data from the positioning means that measures the longitude and latitude at which the worker is located is within a predetermined range centered on the position indicated by the inspection coordinate data, the worker Is determined to be within a predetermined range of the inspection location, and the determination result notifies the operator of the inspection location by sound, so that the operator can detect that he / she is at an appropriate work position.

  However, in the conventional system, only the processing when the position of the equipment to be maintained is determined in advance is performed, and the position of the maintenance target apparatus is unknown or related to the maintenance target apparatus. There is a problem that it is not possible to deal with when the sensor is not associated.

  The present invention has been made to solve the above-described problems. When the position of the maintenance target device is unknown, various sensors indicating the status of the maintenance target device are associated with the maintenance target device. It is an object of the present invention to provide a device maintenance support system and a device maintenance server that can easily correspond to a maintenance target device and a sensor that indicates the state of the device in a situation that is not.

  The device maintenance support system according to the present invention is a device maintenance support system including a sensor and a device maintenance server having a database for specifying a predetermined maintenance target device. The device maintenance server includes a determination unit that determines whether the sensor is for a device to be maintained.

  Preferably, the determination unit includes a calculation unit that calculates a determination index for determining whether or not the sensor is for a maintenance target device.

  More preferably, a predetermined weighting coefficient is determined for each determination index, and the calculation means calculates the determination index in consideration of the weighting coefficient.

  A plurality of determination indexes may be calculated for each maintenance target device, and the calculation unit may calculate one determination index for one maintenance target device in consideration of the plurality of determination indexes.

  The determination index may be the position information of the maintenance target device, may be the owner of the sensor, or may be the accuracy of the sensor.

  In another aspect of the present invention, the device maintenance server includes a database that stores specific data on a predetermined maintenance target device, and a receiving unit that can receive information from an external sensor. And determining means for determining whether or not the sensor is for a device to be maintained.

  In the present invention, since the determination means for determining whether or not the sensor is related to the maintenance target device is provided, various sensors that indicate the state of the maintenance target device or the position of the maintenance target device are unknown. Can be easily associated with the maintenance target device in a situation where the device is not associated with the maintenance target device.

It is a block diagram which shows the whole structure of the maintenance assistance system of the apparatus which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of a control part in 1st Embodiment. It is a block diagram which shows the structure around the information analysis part in 1st Embodiment. It is a flowchart which shows operation | movement of a matching part. It is a figure which shows the flow of a process of the data in a matching part. It is a figure which shows the structure of a sensor management database. It is a figure which shows the structure of a maintenance object apparatus management database. It is a figure which shows the matching table of a maintenance object apparatus and a sensor. It is a flowchart which shows the processing content of an apparatus state determination part. It is a flowchart which shows the processing content of a repair plan preparation part. It is a block diagram which shows the whole structure of the maintenance assistance system of the apparatus which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of a control part in 2nd Embodiment. It is a block diagram which shows the whole structure of the maintenance assistance system of the apparatus using the value provision type | mold information collection server.

(1) First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the first embodiment will be described. 1st Embodiment acquires the sensing data from the sensor provided outside about the predetermined "maintenance object apparatus list", and determines the necessity for apparatus repair based on the content of data Is the case. If it is determined that repair is necessary, a repair plan will be prepared, and the maintenance company will carry out repairs based on the contents of the repair instructions, and the repair result will be described as the maintenance management target database (hereinafter referred to as “DB”). Is reflected).

  FIG. 1 is a block diagram showing the overall configuration of the equipment maintenance support system according to the first embodiment. Referring to FIG. 1, a device maintenance system 10 includes a device maintenance server 20 and a plurality of sensors 50 that can be connected to the device maintenance server 20 via a network 40. The plurality of sensors 50 include, for example, a mobile phone 51, a smartphone 52, a digital camera 53, a fixed camera 54, a vibration sensor 55, a deterioration sensor 56, and the like. Here, the “sensor” includes any device such as a mobile phone that can detect some information on the device.

  Information collected from a wide variety of sensors is collected as various forms of data depending on the type of sensor. For example, if it is data from a mobile phone with GPS, it is “photo information” + “GPS data”, and if it is information from a fixed camera, it is “video” + “position information” + “camera angle of view”. + “Camera direction”. Further, in the case of an advanced sensor, the data is “terminal information” + “degradation degree”. Information analysis is performed to use these data as sensing data. This information analysis function varies depending on the type of sensor, and if it is an advanced sensor, it is mounted on the sensor side. Furthermore, data that is difficult to be used as sensing data by using collected data alone, as in the case of a mobile phone with GPS, may be made available as sensing data by processing information through human hands.

  The device maintenance server 20 includes a control unit 30 having a CPU, a plurality of databases connected to the control unit 30, and a sensor information receiving unit 25 that receives information from a plurality of external sensors via the network 40. The plurality of databases include a sensor management database 21, a sensing data database 22, a repair information database 23, and a maintenance management target device database 24. A maintenance worker of a company that performs maintenance of the device accesses the device maintenance server 20 using the terminal device 58 and registers a repair or inspection record of the maintained device in the maintenance management target device database 24 of the device maintenance server 20.

  The control unit 30 matches the information analysis unit 31 for analyzing (adding value) as sensor data based on information from various sensors and whether or not the sensing data from the sensor is for the maintenance target device. A matching unit 32 to be performed, a device state determination unit 33 that determines the state of the maintenance target device from the matched sensing data, and a repair plan creation unit 34 are included.

  The matching unit 32 and the device state determination unit 33 perform device matching and device state determination based on information from the sensing data database 22 and the maintenance management target device database 24. The repair plan creation unit 34 creates a repair plan for equipment based on information from the repair information database 23 and the maintenance management target equipment database 24. In FIG. 1, the control unit 30 is divided into a plurality of element blocks, which are functional blocks of the control unit 30.

  Here, the “maintenance target device list” is a predetermined list of maintenance target devices stored in the maintenance management target device database 24 for management by the administrator. Refers to sensor information collected in the device maintenance database 20 including general persons. Various types of data (including processing results such as “failure”, “deterioration”, and “rupture” determined from still images, moving images, vibration information, deterioration information and images) are included.

  Next, each database will be described. The sensor management database 21 stores management information of sensors attached to maintenance target devices. The sensing data database 22 stores sensing data detected by the sensor. The repair information database 23 stores information necessary for repairing the maintenance target device. The maintenance management target device database 24 is a database in which the information related to the maintenance management target device is stored as described above, and the following information is associated with each maintenance target device.

  Static information that identifies the device, such as the device type, name, ID, etc., information that identifies the device status, such as the location of the device, the equipment to be configured, and the manufacturer, the date of installation, and past maintenance records Information and association information with a sensor representing a state are stored. Here, this data may or may not be associated with sensing data. In addition, two or more devices and sensors may be associated.

  In addition, the device repair necessity judgment condition is stored. This is a determination condition for setting “repair required” based on the associated sensor information. Moreover, it is information required for repair, such as a repair person in charge and a repair member.

  Next, the operation of the control unit (CPU) 30 of the device maintenance server 20 will be described. FIG. 2 is a flowchart showing the operation of the control unit 30. With reference to FIG. 3, the control unit 30 collects information by the sensor information receiving unit 25 via the network 40 (step S <b> 21, hereinafter, steps are omitted). Next, the information analysis unit 31 analyzes the information (S22), the matching unit 32 is matched (S23), the device state determination unit 33 determines the state of the device (S24), and the repair plan creation unit 34 determines the device state. A repair plan is created (S25). This will be specifically described below.

  FIG. 3 is a schematic diagram showing the contents of data processing in the information analysis unit 31. Here, data 56a from the deterioration sensor, data 54a from the fixed camera, and data 51a from the camera of the mobile phone are received via a sensor information collection unit (not shown), and each is stored in the sensing data database 22. This shows the state.

  The information analysis unit 31 analyzes the sensing data based on the sensor information received via the network 40, processes the information with added value, and stores the information. The specific processing contents are as follows.

  Use the sensor ID as a key from sensor management to obtain static information about the sensor. Static information includes GPS coordinates. When there is a camera image, image processing suitable for the sensor is performed based on the image content, and an image processing result is created. When there is no sensor ID, sensor information is recorded using GPS coordinates as keys. Note that if there is a measurement date and time, the source or type of information, a comment of the information provider, etc., they are also recorded in the sensing data database 22.

  The following examples can be considered as “sensor information” for determining deterioration of equipment.

(A) In the case of information from a mobile camera with GPS (photo + location information) About the adjacent “maintenance target device” derived from the “location information” using the “location information” and “photo” provided as information , Compare and analyze the difference from a photograph that has been taken in advance in a periodic inspection, etc., determine the presence or absence of deterioration, provide the administrator with the comparison results and the sensor information of the photograph and location information, the final presence or absence of deterioration Prompt for judgment. Based on the results, use it as sensing data and create a repair plan.

(B) In the case of information from a fixed camera (“movie” + “position information” + “camera angle of view” + “camera direction”) In this case as well, based on the “position information”, “maintenance target device” And compare and analyze the difference from the previously captured video. In the case of a fixed camera, since past states can be accumulated, it is possible to perform comparative analysis with a difference with higher accuracy, and to automatically perform deterioration determination.

(C) In the case of information (terminal information) + “deterioration degree” from the advanced deterioration determination sensor For example, it is possible to detect vibration different from normal by a vibration sensor or the like and determine deterioration, It is also possible to determine that the deterioration is caused by a sound different from normal by an acoustic sensor or the like. When these sensors are used, it is determined that the sensor side is deteriorated, and can be used as sensing data based on the information on the “degree of deterioration” from the sensor.

(D) Others In addition to using sensors as described above, the case where the administrator designates “degradation” for the applicable maintenance target devices based on telephone notifications or email notifications from the general public. It can also be used as sensing data.

  Next, the processing of the matching unit 32 will be described. 4 is a flowchart showing the processing of the matching unit 32, that is, the processing content of S23 of FIG. 2, and FIG. 5 is a schematic diagram showing the content of data processing in the matching unit 32. Referring to FIGS. 4 and 5, matching unit 32 calculates an index (determination index) α to determine whether the updated sensing data is associated with the maintenance management target device. In FIG. 5, the matching unit 32 includes an index α calculation unit 32 a, and the matching between the sensing data 22 a stored in the sensing data database 22 and the maintenance target device registration pattern stored in the maintenance management target device database 24 in advance. This shows the processing contents of determining the degree (index α), creating a matching table between the sensor and the maintenance target device and sending it to the device state determination unit 33.

  Table 1 shows a specific example of the index α used in this process. Each index is weighted in advance according to the importance of the index, and the sum is a probability that represents the ID of the maintenance target device.

  The specific processing flow is as follows. As shown in Table 1, the matching unit 32 detects the number of sensors related to the target device and the number of indices α. Next, the index α is calculated and the sum is calculated (S231 to S235). It is determined whether or not the sum of the indices α is equal to or greater than a predetermined threshold value. If the past n times or more data is equal to or greater than the threshold value, the sensing data is a maintenance target device and the matching table of the maintenance target device and the sensor 27 (S236 to S238). This is repeated for the number of sensors. If the data of the past n times or more is not more than the threshold value (NO in S236 and S237), the process returns to S231.

  Therefore, the matching unit 32 operates as a determination unit that determines whether or not the sensor is for the maintenance target device.

  If an abnormality occurs in the device, the pattern of the registered maintenance target device is different from the pattern obtained from the sensor, making matching impossible. Therefore, the past α value is used to make a determination for matching. .

  The determination condition is determined by the position information and the device ID itself. In addition to this, the determination may be made based on the matching degree of the shape or color pattern of the target device.

  Next, the structure of the database and table used in this process will be described. 6 shows the configuration of the sensor management database 21, FIG. 7 shows the maintenance management target device database 24, and FIG. 8 shows the configuration of the maintenance target device and sensor matching table.

  As illustrated in FIG. 6, the sensor management database 21 includes a sensor ID, a data type, an owner ID, sensor position information, sensor accuracy, data acquisition time, and sensing data. The data type is image, temperature, sound, etc., and the sensor accuracy is expressed in three stages, for example, high, medium, and low.

  As illustrated in FIG. 7, the maintenance management target device database 24 includes a maintenance target device ID, an owner ID, sensor position information, a registration time, a pattern type of registration data, and pattern data.

  As illustrated in FIG. 8, the maintenance target device / sensor matching table stores a sensor ID and an index α for each maintenance target device.

  Next, processing contents of the device state determination unit 24 shown in S24 of FIG. 2 will be described. FIG. 9 is a flowchart showing the processing contents of the device state determination unit 24. Referring to FIG. 9, since the matching unit 32 obtains the corresponding sensor and the index α for each maintenance target device, the state of the maintenance target device is determined based on the sensing data. Specifically, a repair necessity judgment condition is requested to the maintenance management target device database 24, and a repair necessity judgment condition is acquired (S241, S242). The necessity of repair is determined, and a repair instruction is created as necessary (S243 to S244, S25).

  The repair necessity determination condition is composed of one or more conditions. Judgment results include “repair required”, “repair not required”, “unknown” and “hold”.

  Next, examples of determination conditions will be described. For example, in the case of the deterioration determination condition of “electric pole”, if the deterioration determination sensor is “degraded state” continued m 1 or more times, or the image sensor is “degradation determination” continued m 2 times or more, it is determined “repair required”.

  On the other hand, if the deterioration determination sensor is “no deterioration” continued m3 times or more, the image sensor is “no deterioration” continuous m4 times or more, and there is no other sensor information, it is determined that repair is unnecessary.

  If it is other than the above, it is determined as “unknown”.

  Next, an example of the level crossing deterioration determination condition will be described. In this case, if the level crossing abnormality signal is “abnormal” continues for 5 times or more, it is determined that repair is necessary, and if the level crossing abnormality signal is “normal” m 6 times or more and there is no other sensor information, it is determined that repair is unnecessary. In addition, it is determined that other than the above is unknown. If information provided by a mobile phone or information provided by photo mail is regarded as a sensor, these correspond to unknown. Note that m1 to m6 may be determined in advance or may be variables.

  Here, whether or not repair is necessary can be automatically determined from the sensing data by the device state determination unit 24, but if the administrator or the like needs to be determined, check with the administrator. .

  Further, FIG. 9 also shows an outline of pre-processing and post-processing of the device state determination unit 24.

  Next, the processing content of the repair plan preparation part 34 shown by S25 of FIG. 2 is demonstrated. FIG. 10 is a flowchart showing the processing contents of the repair plan creation unit 34. Referring to FIG. 10, in the repair plan creation, a repair plan is created by referring to the maintenance management target device database 24, its instruction is created, and instructions are given to maintenance personnel via the terminal 58, and the result is stored. It is stored in the maintenance management target device database 24 via the terminal 58 of all members (S251 to S254).

  At this time, information such as a repair method corresponding to the failure content and a repair instruction destination (maintenance company) is acquired from the maintenance management target device database 24 and created as a repair instruction. Update the contents of the device status of the maintenance management target device DB to the status of waiting for repair.

  As the repair instruction (S252), the maintenance instruction content is notified to the maintenance company as an instruction. Moreover, in the repair implementation, maintenance personnel carry out repairs based on the contents of the repair instruction. In the repair status management (S254), the contents of the maintenance management target device DB are updated based on the repair work result.

(2) Second Embodiment Next, a second embodiment of the present invention will be described. In the first embodiment, the state of the device is determined based on sensing data provided from outside. However, in the second embodiment, the first point is that the device management company determines the device state. Different from the embodiment. That is, in this embodiment, the device management company determines when to determine the status of the device to be maintained. Therefore, only different parts will be described, and the other parts will be denoted by the same reference numerals and the description thereof will be omitted.

  FIG. 11 is a diagram corresponding to FIG. 1 in this embodiment. Referring to FIG. 11, data for determining the device status is transmitted from terminal 59 of the person in charge of the device management company to device status determination unit 33.

  FIG. 12 is a flowchart showing the operation of the control unit 30 in this embodiment, and corresponds to FIG. 2 of the previous embodiment. However, here is a flowchart with a slightly different view. Also in this embodiment, it is assumed that arbitrary data is collected via the network, and the maintenance target device and the sensor are associated in advance.

  Referring to FIG. 12, when a person in charge of the device management company outputs an instruction to detect the state of the maintenance target device via terminal 59, the maintenance management target device database 24 is referred to accordingly, Sensing data is acquired from the sensing data database 22 for the device to be maintained (S31, S32). The equipment state is determined (S33), a repair plan is created as necessary, a repair instruction is issued, the repair is performed, and the repair state is stored in the maintenance management target equipment database 24 (S34 to S38).

  In the above embodiment, the case where information from the sensor 50 that can be connected to the device maintenance server 20 via the network 40 is collected has been described. However, information collection in the device maintenance server 20 is performed. The information providing server 26 may receive information from an arbitrary information providing device (sensor) from an external person and provides a value according to the information. FIG. 13 shows a block diagram corresponding to FIGS. 1 and 2 in this case. Here, the compensation providing type information collection server 26 collects information from the sensor 50 via the network 40, and the maintenance worker terminal 58 and the maintenance company terminal 59 of the management company of the maintenance target device communicate with each other. However, an example of performing maintenance of a maintenance target device is shown, and in the figure, data transmitted and received bidirectionally between each terminal and server is shown.

(3) Examples Next, specific examples using the above embodiment will be described.

(I) Example 1
Here, the maintenance inspection work of the utility pole will be described.

  Get a report from an ordinary person when rust or corrosion is detected on a utility pole. When making a report, have the following photo information sent with GPS data. (A) An image of a two-dimensional barcode attached to a utility pole (specific information of the utility pole is described in the two-dimensional barcode). (B) Real image information of rust and corrosion.

  As described above, what kind of state is generated in which power pole is collected as sensing data.

  A corresponding maintenance worker is selected based on the collected unique information of the utility pole, and a repair instruction is transmitted to the maintenance worker along with the collected sensing data. The maintenance worker who receives the repair instruction prepares necessary repairs for the target utility pole and performs repair work. When the repair is completed, a completion report is transmitted online to the device maintenance server 20 to complete the work.

  At this time, consideration may be provided to a general user who has transmitted useful maintenance information according to the value of the provided information calculated by the system.

(Ii) Example 2
This embodiment relates to a maintenance inspection work for a railroad crossing.

  Get a report from a general user who has a mobile terminal with GPS or a station employee when an abnormality such as a railroad crossing bar is broken or maintenance is required. When making a report, have the actual image information sent with GPS data. Based on the collected information on the utility pole, the maintenance personnel are selected and repair instructions are sent to the maintenance personnel.

The maintenance worker who has received the repair instruction prepares necessary for the target repair and performs the repair work.
When repairs are completed, a completion report is sent online to complete the work.

  Compensation may be provided to a general user who has transmitted useful maintenance information according to the value of the provided information calculated by the system.

(Iii) Example 3
This embodiment relates to road maintenance inspection work.

  Get information about road degradation points from general users with mobile terminals with GPS and regular maintenance patrol cars. When making a report, have the following real image information sent with GPS data. Based on the collected information on the utility pole, the maintenance personnel are selected and repair instructions are sent to the maintenance personnel. The maintenance worker who has received the repair instruction prepares necessary for the target repair and performs the repair work. When repairs are completed, a completion report is sent online to complete the work.

  Compensation may be provided to a general user who has transmitted useful maintenance information according to the value of the provided information calculated by the system.

(Iv) Example 4
This embodiment relates to provision of equipment maintenance information.

  In general, the life and failure of equipment depend on the temperature and environment where the equipment is located and the frequency of equipment specifications. In many cases, there is a correlation between a device failure and device error information obtained from a sensor or the like.

  The device maintenance server 20 analyzes the state of the device from the collected error information of the device, the information of sensors installed around the device, and the maintenance result information, and formulates a maintenance plan from the predicted deterioration information of the device. .

  In addition, by providing the information to the device manufacturer, it is fed back to the device design. These pieces of information provided from the system are useful information that can be utilized in the design of the device, and it is conceivable to obtain compensation according to the value of the information. At this time, information that may or may not be provided to the device manufacturer may be determined in advance by the system based on the information provider contract and the information user contract, and automatically selected.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  According to the present invention, when the position of the maintenance target device is unknown or when various sensors indicating the status of the maintenance target device are not associated with the maintenance target device, the sensor indicating the status of the device and the maintenance Since it is possible to provide a maintenance support system for equipment that can easily cope with the target equipment, it is advantageously used as a maintenance support system for equipment.

  10 equipment maintenance system, 20 equipment maintenance server, 21 sensor management database, 22 sensing data database, 23 repair information database, 24 maintenance management target equipment database, 25 sensor information reception section, 30 control section, 31 information analysis section, 32 matching Unit, 33 device state determination unit, 40 network, 50 sensor, 51 mobile phone, 52 smartphone, 53 digital camera, 54 fixed camera, 55 vibration sensor, 56 deterioration sensor. 58, 59 Terminal device.

Claims (8)

A device maintenance support system including a sensor and a device maintenance server having a database for identifying a predetermined maintenance target device,
The apparatus maintenance server includes an apparatus maintenance support system including a determination unit that determines whether or not the sensor is for the apparatus to be maintained.   The apparatus maintenance support system according to claim 1, wherein the determination unit includes a calculation unit that calculates a determination index for determining whether or not the sensor is for a maintenance target apparatus.   The equipment maintenance support system according to claim 2, wherein a predetermined weighting coefficient is determined for each determination index, and the calculation unit calculates the determination index in consideration of the weighting coefficient.   4. The plurality of determination indexes are calculated for each of the maintenance target devices, and the calculation unit calculates one determination index for one maintenance target device in consideration of the plurality of determination indexes. Maintenance support system for equipment described in 1.   The equipment maintenance support system according to claim 2, wherein the determination index is position information of the equipment to be maintained.   The equipment maintenance support system according to claim 2, wherein the determination index includes a sensor owner.   The equipment maintenance support system according to claim 2, wherein the determination index includes sensor accuracy. A database for storing specific data on predetermined maintenance target devices;
A device maintenance server having a receiving unit capable of receiving information from an externally provided sensor,
A device maintenance server, comprising: determination means for determining whether the sensor is for the device to be maintained.

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