Method for measuring gas concentration and determining whether it is normal or abnormal.

Abstract

In continuous production, the condition of raw materials is repeatedly checked by sensor detection at predetermined time intervals. [Solution] This method for measuring gas concentration involves activating a mechanism that adjusts the target gas, which is generated from raw materials contained in a container and drawn into a measurement area including a gas sensor, to a concentration suitable for measurement, and then drawing the target gas into the measurement area after the mechanism has been activated and measuring it with the gas sensor.

Description

Technical Field

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[0001] The present invention relates to a method for measuring gas concentration and a method for determining normal or abnormal conditions.

Background Art

[0002] For example, Patent Document 1 discloses a refrigerator including a storage chamber for storing food, a door portion that is opened and closed so as to block or open between the storage chamber and the outside of the storage chamber, a gas sensor disposed in the storage chamber or the door portion that outputs an electrical signal corresponding to the concentration of gas released during the process of food spoilage, and a determination device that determines the freshness of food based on the change over time of the output values of a plurality of electrical signals output from the gas sensor.

Prior Art Documents

Patent Documents

[0003] <了

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, by replacing the confirmation of the state of raw materials in the manufacturing process of food and the like from the senses such as the vision and smell of workers with sensor detection, it becomes possible to promote the automation of the manufacturing process. On the other hand, when continuous production is performed in the manufacturing process, it is required to perform the confirmation of the state of raw materials by sensor detection at a predetermined time interval. The shorter the predetermined time interval here, the more possible it is to improve the productivity of the manufacturing process. However, in the conventional technology, it has been difficult to repeatedly confirm the state of raw materials by sensor detection at a predetermined time interval in continuous production.

[0005] The objective of the present invention is to solve these problems, and specifically, to perform repeated checks of the raw material status by sensor detection at predetermined time intervals in continuous production. [Means for solving the problem]

[0006] To this end, the present invention is a method for measuring gas concentration, which involves activating a mechanism to adjust the target gas, generated from raw materials contained in a container and drawn into a measurement area including a gas sensor, to a concentration suitable for measurement, and then drawing the target gas, after the mechanism has been activated, into the measurement area and measuring it with the gas sensor. Here, the mechanism may be a mechanism for stirring the target gas within the container. The container may also be a container with a lid, and the stirring may be performed by the operation of a fan provided on the lid. Furthermore, the container may be a container with a lid, and the lid may be provided with a suction port for drawing in the target gas. Another aspect of the present invention that achieves the above objective is a method for determining normality or abnormality, which involves activating a mechanism to adjust the target gas generated from raw materials contained in a container and drawn into a measurement area including a gas sensor to a concentration suitable for measurement, drawing the target gas after the mechanism has been activated into the measurement area and measuring it with the gas sensor, and determining the normality or abnormality of the raw materials based on the measurement results. Here, the determination of whether the raw material is normal or abnormal can be made based on a threshold value for the measured value or on the change in the measured value over time. [Effects of the Invention]

[0007] According to the present invention, it becomes possible to repeatedly check the condition of raw materials by sensor detection at predetermined time intervals in continuous production. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows an example of the overall configuration of the manufacturing system according to this embodiment. [Figure 2]This diagram illustrates an example of a flow path connection in the main body. [Figure 3] This diagram illustrates examples of operating patterns for on-off valves and solenoid valves in flow path connections, with (a) being the first operating pattern and (b) being the second operating pattern. [Figure 4] This diagram illustrates examples of operating patterns for on-off valves and solenoid valves in flow path connections, with (a) being the third operating pattern and (b) being the fourth operating pattern. [Figure 5] This diagram illustrates an example of the operation flow in a manufacturing process, with (a) to (e) showing the steps in sequence. [Figure 6] This is a diagram illustrating the container and lid. [Figure 7] This is a block diagram illustrating the functions of the control device. [Figure 8] This flowchart shows an example of processing in a control device. [Figure 9] This graph shows the test results of measurements of the manufacturing system. The vertical axis represents the sensor measurement value, and the horizontal axis represents the measurement time (s) elapsed since the start of measurement. [Figure 10] This graph illustrates the verification process when using a gas sensor to measure the target gas. The vertical axis represents the sensor measurement value, and the horizontal axis represents the measurement time (s). [Figure 11] This table explains the verification process when using a gas sensor to measure the target gas, and shows the difference between the start and end values ​​of the measurement by the sensor. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the attached drawings. <Example of overall configuration of manufacturing system 1> Figure 1 is a diagram showing an example of the overall configuration of the manufacturing system 1 according to this embodiment. The manufacturing system 1 shown in Figure 1 is a system for continuous production in a manufacturing process using raw materials, and includes a main unit 11. The main unit 11 is used, for example, in a manufacturing process that performs continuous production. The main unit 11 is an example of a manufacturing apparatus.

[0010] More specifically, as shown in FIG. 1, the manufacturing system 1 includes, in addition to the main body 11, a cleaning gas supply source 12, a regulator 13, a control device 14, a container 16, and a manufacturing line 17. These main body 11 and the like are arranged in the factory 100 shown by the dashed line. Inside the factory 100, the manufacturing system 1 includes a pipe 21, a communication line 22, and a signal line 23. Each of the main body 11 and the control device 14 is supplied with, for example, commercial power by a power cord (not shown).

[0011] Also, as shown in FIG. 1, the manufacturing system 1 includes a monitoring device 18. The monitoring device 18 is arranged in a central monitoring room 200 which is a location separate from the factory 100. In the figure, the area of the central monitoring room 200 is shown by the dashed line. An operator operates the monitoring device 18 in the central monitoring room 200 to perform work. In the factory 100, it is possible to promote unmanned operation without operators during continuous production.

[0012] The pipe 21 is connected to the main body 11 and the cleaning gas supply source 12 to each other, guides the cleaning gas (for example, clean air) from the cleaning gas supply source 12 in the direction of arrow A, and supplies it to the main body 11. The communication line 22 communicably connects the main body 11 and the control device 14. It is conceivable to use, for example, a LAN (Local Area Network) cable for the communication line 22. For example, it is also conceivable to be electrically connected to the equipment provided in the factory using something like the signal line 23 and change the operation on the factory side according to the result of the sensor.

[0013] The above-described pipe 21 is connected to the main body 11, and the above-described communication line 22 is also connected. A duct 24 for suction, which will be described later, is connected to the main body 11. Also, various sensors, which will be described later, are arranged in the main body 11, and it has a function as the main body of the sensor system.

[0014] The cleaning gas supply source 12 supplies cleaning gas, for example, air which is clean air, through the pipe 21. The air here is led from the atmosphere and is air that does not contain the target gas. There is also a conceivable example of making the air cleaner than the atmosphere with an air filter (not shown). The cleaning gas here may be compressed air. In such a case, as the cleaning gas supply source 12, a compressor or the like that generates compressed air can be used. Also, instead of the compressor, it is conceivable to use an air cylinder filled with compressed air. When the cleaning gas is air, it may be compressed air or steam whose pressure and temperature are changed compared to the atmosphere. Also, the cleaning gas may be a gas other than air, for example, nitrogen. The cleaning gas can be a gas other than the target gas.

[0015] The regulator 13 is disposed at an intermediate position in the pipe 21. The regulator 13 adjusts the flow rate and pressure of the cleaning gas from the cleaning gas supply source 12. Note that a configuration in which the regulator 13 is provided with an air filter may be adopted. Also, a configuration in which the control device 14 can acquire the pressure value indicated by the regulator 13 may be adopted. As a configuration for acquiring the pressure value, there is a case where a signal specifying the pressure value is transmitted from the regulator 13 to the control device 14. Also, as a configuration for acquiring the pressure value, there is a case where an image of the display panel of the regulator 13 is photographed with a camera (not shown) and transmitted to the control device 14, and the control device 14 performs image processing on the received image to specify the pressure value.

[0016] As described above, the control device 14 is located inside the factory 100 and is remotely operated by the monitoring device 18 in the central monitoring room 200. The control device 14 can give a predetermined instruction to the main body 11. That is, the control device 14, in response to an instruction from the monitoring device 18, performs, for example, startup, stop, and setting change of the main body 11. Also, the control device 14 acquires the measured values of the sensors provided in the main body 11 in response to a predetermined instruction. The control device 14 is configured to be operable in the factory 100 as a sensor PC.

[0017] Furthermore, if the factory equipment can exchange electrical signals, the control device 14 can issue predetermined instructions to the factory's production line 17. For example, the control device 14 transmits control signals that instruct the operation of the factory's production line 17. The control device 14 can also send status information indicating the state of the sensors it has to the factory's production line 17, informing the factory's production line 17 that the control device 14 is functioning correctly. In addition, if the factory's production line 17 holds sample information or raw material information (hereinafter referred to as sample information), the control device 14 can acquire it. The control device 14 can also perform calculations using values ​​based on the type of raw material that can be set in advance, and calculate values. This makes it possible to measure multiple raw materials.

[0018] The container 16 can, for example, contain raw materials. That is, the container 16 has an opening 16a at its upper end, through which raw materials can be put in and taken out. The container 16 has a mechanism to adjust the target gas, which is generated from the raw materials contained in the container and drawn into the measurement area including the gas sensor, to a concentration suitable for measurement. Possible mechanisms for this include stirring, changing the temperature, shaking from the outside, changing the position of the suction port, and attaching a lid 16b. These may also be combined. When the lid 16b is attached to the container 16, the opening 16a of the container 16 becomes smaller or is closed without any gaps. In addition to the configuration with the lid 16b, the container 16 can also be configured without the lid 16b.

[0019] The lid 16b is connected to the end of the duct 24 extending from the main body 11. A fan 24a is located inside the duct 24. The fan 24a functions as a suction unit to draw air from the container 16 into the main body 11. In addition to being placed at any position within the duct 24, the fan 24a can also be placed inside the main body 11.

[0020] A fan 16c is positioned on the inner surface of the lid 16b. The fan 16c functions as a stirring unit to agitate the air inside the container 16. Therefore, when the fan 16c is activated with the lid 16b attached to the container 16, the air inside the container 16 is agitated. The fan 16c is positioned so that the air inside the container 16 is drawn into the duct 24 relative to the raw materials in the container 16.

[0021] A manufacturing line 17 can generally be configured to produce products using the raw materials contained in containers 16. Manufacturing line 17 enables efficient product production through a series of assembly line operations.

[0022] As described above, the monitoring device 18 is located in the central monitoring room 200 and remotely operates the control device 14 in the unmanned factory 100. Furthermore, the measurement data, which is data measured by various sensors in the main unit 11, is stored in the control device 14. Furthermore, the measurement data may be stored on a server device (not shown) connected via a network. This would enable visualization of the measurement data and facilitate its storage and utilization.

[0023] Furthermore, control signals can be exchanged between the manufacturing line 17 and the control device 14 via input / output units. This simplifies the overall system configuration and enhances its robustness.

[0024] <Example of flow path connection in the main body 11> Figure 2 illustrates an example of flow path connection in the main body 11. As shown in Figure 2, the main body 11 includes on-off valves 31a and 31b and solenoid valves 32a and 32b within the housing 11K. The on-off valves 31a and 31b are equipped with valves that open and close using an actuator such as a motor, switching between a state where fluid flows through the flow path and a state where fluid does not flow. The solenoid valves 32a and 32b are combinations of electromagnets and valves, and switch the flow path by turning them ON / OFF.

[0025] The main unit 11 includes sensors 33a, 33b, 33c, and 33d, and a sensor holder 33e that holds sensors 33a to 33c, all housed in a casing 11K. Sensor 33a is a sensor that measures temperature and humidity. By including sensor 33a, the measurement results can be corrected. Therefore, the influence of temperature and humidity on the measurement results can be suppressed.

[0026] Sensors 33b and 33c are SnO2 (tin dioxide) gas sensors that measure the alcohol concentration in the target gas. Sensor 33d is an EC (Electrical Conductivity) sensor and, like sensors 33b and 33c, measures the alcohol concentration in the target gas. Sensor 33d is located downstream of sensor holder 33e. The alcohol referred to here is, for example, ethanol. The term "target gas" here refers to gases generated from raw materials, such as gases produced as a result of the spoilage of raw materials.

[0027] Sensor 33d has high selectivity for ethanol components. Sensors 33b to 33c can measure ethanol components across a wide concentration range. Thus, the reason for incorporating multiple types of sensors in this embodiment is to allow the user to select the appropriate sensor depending on the range of ethanol concentrations in the target gas to be measured and the presence of interfering components.

[0028] Here, it is conceivable to use inexpensive gas sensors 33b to 33d that can repeatedly measure, for example, the alcohol concentration of the target gas in a continuous production process. Gas sensors used in a continuous production process are preferably of a type that detects the presence or absence of gas by adsorbing gas components onto the surface of the sensor element. Gas sensors can be electrochemical or semiconductor type, rather than optical type. Sensors 33b to 33d are sometimes referred to as "gas sensors." Sensors 33b to 33d are examples of gas sensors. In this embodiment, the measurement target of sensors 33b to 33d is alcohol concentration, but it is not limited to this. For example, the concentration of ammonia, etc., could also be considered. In other words, anything that can be measured by a commercially available gas sensor can be the measurement target. In this embodiment, sensors 33b to 33d are equipped with multiple gas sensors that can detect different types of gases, enabling measurement of multiple types of raw materials.

[0029] The main unit 11 includes an air filter 34 and a pump 35 within the housing 11K. The air filter 34 is located downstream of the on-off valves 31a and 31b. When the on-off valves 31a and 31b are opened, the fluid flowing through the passage passes through the air filter 34.

[0030] Pump 35 is a suction pump for drawing in fluid and is located downstream of the solenoid valve 32a and sensor 33d. Note that if the main body 11 includes the pump 35, a modified version can be considered in which the fan 24a (see Figure 1) in the duct 24 is omitted. Conversely, if the duct 24 includes the fan 24a (see Figure 1), a modified version can be considered in which the pump 35 is omitted.

[0031] The main body 11 includes pipes 36a, 36b, and 36c having intersecting sections. These intersecting sections are formed by joints 37a to 37c, which will be described later. Joints 37a to 37c are connecting parts that connect pipes to each other and are T-shaped. The piping 36a to 36c is configured in one of two ways: either by branching from one upstream piping to two downstream piping at the intersection, or by connecting from two upstream piping to one downstream piping. In the latter case, one of the two upstream pipings communicates with the downstream piping by switching the flow path using on-off valves 31a and 31b or solenoid valve 32a. The pipes 36a, 36b, and 36c, which have intersections, will be described below.

[0032] The piping 36a has a joint 37a as an intersection. One upstream pipe and two downstream pipes are connected to the joint 37a. More specifically, joint 37a connects the aforementioned pipe 36a as the upstream pipe and pipe 36d as the downstream pipe. Pipe 36a is connected at its upstream end to the intake port 11a formed on the outer surface of the housing 11K. Alternatively, it connects pipe 36e as the upstream pipe and pipe 36a as the downstream pipe. Pipe 36d is connected at its downstream end to the aforementioned on-off valve 31a in the case of suction. Pipe 36e is connected at its upstream end to the aforementioned solenoid valve 32b in the case of flushing. Furthermore, piping 36a is connected to the aforementioned duct 24 (see Figure 1) via the intake port 11a of the housing 11K. This allows the target gas to be supplied to piping 36a.

[0033] The piping 36b has a joint 37b as an intersection. Two upstream pipes and one downstream pipe are connected to the joint 37b. More specifically, the joint 37b comprises the aforementioned piping 36b as the upstream pipe, piping 36f as the downstream pipe, and piping 36g as the upstream pipe. Piping 36b is connected to the aforementioned on-off valve 31a at its upstream end. Piping 36f is connected to the aforementioned air filter 34 at its downstream end. Piping 36g is connected to the aforementioned on-off valve 31b at its upstream end.

[0034] The piping 36c has a joint 37c as an intersection. Two upstream pipes and one downstream pipe are connected to the joint 37c. More specifically, the joint 37c comprises the aforementioned piping 36c as the upstream pipe, piping 36h as the downstream pipe, and piping 36i as the upstream pipe. Piping 36c is connected to the aforementioned sensor 33d at its upstream end. Piping 36h is connected to the aforementioned pump 35 at its downstream end. Piping 36i is connected to the aforementioned solenoid valve 32a at its upstream end.

[0035] The main body 11 includes the aforementioned pipes 36a to 36c, as well as pipes 38a to 38f. Pipes 38a to 38f will now be described. The piping 38a is connected to the aforementioned on-off valve 31b at its downstream end. More specifically, the piping 38a connects the aforementioned on-off valve 31b to the intake port 11b formed on the outer surface of the housing 11K. Furthermore, piping 38a is connected to the aforementioned piping 21 (see Figure 1) via the intake port 11b of the housing 11K. This allows cleaning gas to be supplied to piping 38a.

[0036] Piping 38b connects the air filter 34 and the sensor holder 33e. Piping 38c connects the sensor holder 33e and the solenoid valve 32a. Piping 38d connects the solenoid valve 32a and the sensor 33d. Piping 38e connects the pump 35 and the solenoid valve 32b.

[0037] The piping 38f is connected to the solenoid valve 32b described above at its upstream end. More specifically, the piping 38f connects the solenoid valve 32b described above to the exhaust port 11c formed on the outer surface of the housing 11K.

[0038] Now, let's explain the on / off valves 31a to 31b. The on-off valves 31a and 31b are two-port on-off valves, and can be switched between allowing fluid to flow and not flowing by controlling the power supply ON / OFF. Pipes 36d and 36b are connected to valve 31a. Pipes 38a and 36g are connected to valve 31b.

[0039] When valve 31a is open, the fluid in pipe 36d flows from pipe 36b to joint 37b. Also, when valve 31b is open, the fluid in pipe 38a flows from pipe 36g to joint 37b. In this embodiment, when valve 31a is open, valve 31b is closed. Conversely, when valve 31b is open, valve 31a is closed. In other words, the valves are controlled to either be open or both closed. There is no state where both valves 31a and 31b are open.

[0040] Now, let's explain the solenoid valves 32a and 32b. Solenoid valves 32a to 32b are 3-port solenoid valves having A port, P port, and R port. By controlling the power supply ON / OFF, it is possible to switch between the A port and P port being in communication and the A port and R port being in communication. In solenoid valve 32a, port A is connected to pipe 38c, port P is connected to pipe 38d, and port R is connected to pipe 36i. In solenoid valve 32b, port A is connected to pipe 38e, port P is connected to pipe 36e, and port R is connected to pipe 38f.

[0041] More specifically, when the solenoid valve 32a is energized, port A and port P are connected. As a result, the fluid in pipe 38c flows through pipe 38d and then through sensor 33d and pipe 36c towards joint 37c. When the power is turned off, port A and port R are connected. As a result, the fluid in pipe 38c flows into pipe 36i and then towards joint 37c.

[0042] Furthermore, when the solenoid valve 32b is energized, port A and port P are connected. As a result, the fluid in pipe 38e flows through pipe 36e and towards joint 37a. When the power is turned off, port A and port R are connected. As a result, the fluid in pipe 38e flows into pipe 38f and is exhausted from exhaust port 11c.

[0043] <Example of operation pattern of the main unit 11> Figures 3 and 4 illustrate examples of operation patterns for the on-off valves 31a and 31b and solenoid valves 32a and 32b in the flow path connection. Figure 3(a) shows the first operation pattern, Figure 3(b) shows the second operation pattern, Figure 4(a) shows the third operation pattern, and Figure 4(b) shows the fourth operation pattern. The first and second operation patterns are performed during the measurement of the target gas and can be called the measurement line. The third and fourth operation patterns are performed during cleaning after measurement and can be called the cleaning line. Figures 3 and 4 correspond to Figure 2 described above and use the same reference numerals.

[0044] Figures 3(a), (b) and 4(a) show the case where the target gas as a fluid is supplied to the intake port 11a of the main body 11, and the cleaning gas as a fluid is supplied to the intake port 11b. Figure 4(b) shows the case where the cleaning gas is supplied to the intake ports 11a and 11b of the main body 11. The target gas to be supplied is drawn in by the operation of pump 35.

[0045] <First operation pattern and second operation pattern> In both the first and second operation patterns shown in Figures 3(a) and (b), the on-off valve 31a is energized ON, the on-off valve 31b is energized OFF, and the solenoid valve 32b is energized OFF. The first and second operating patterns differ in whether the solenoid valve 32a is energized ON or OFF. Specifically, in the first operating pattern, the solenoid valve 32a is energized ON, while in the second operating pattern, the solenoid valve 32a is energized OFF.

[0046] In the first operating pattern shown in Figure 3(a), the on-off valve 31a is open, and the target gas is supplied to the inside of the main body 11 from the intake port 11a. In the first operating pattern, the on-off valve 31b is closed, so the cleaning gas is not supplied to the inside of the main body 11.

[0047] In the first operating pattern, the target gas flows through the following path due to the control of the on-off valves 31a and 31b and the solenoid valves 32a and 32b. Specifically, in the first operating pattern, the target gas flows through pipes 36a, 36d, 36b, 36f, and 38b towards the sensor holder 33e. As a result, the target gas is measured by sensors 33a to 33c. The target gas then flows through the channel from the sensor holder 33e through the pipe 38c.

[0048] Furthermore, in the first operating pattern, since the solenoid valve 32a is energized ON, port A and port P are in communication. Therefore, the target gas travels through the piping 38d connected to port P of the solenoid valve 32a towards sensor 33d. The target gas then travels through piping 36c, 36h, 38e, and 38f and is exhausted from exhaust port 11c.

[0049] Furthermore, since the target gas is drawn in by the pump 35 and passes through the piping 36a, etc., by directing the flow of the target gas to the sensors 33a to 33d, it becomes possible to measure with higher sensitivity. In addition, in this embodiment, the pump 35 is located near the exhaust port 11c, but this is not the only possible configuration.

[0050] In the second operating pattern shown in Figure 3(b), the path from piping 38c to port A of solenoid valve 32a is the same as in the first operating pattern described above. Also, in the second operating pattern, as in the first operating pattern, the on-off valve 31b is closed, so the cleaning gas is not supplied to the inside of the main body 11.

[0051] In the second operating pattern, the solenoid valve 32a is powered OFF, so port A and port R are in communication. Therefore, the path in the second operating pattern is different from that in the first operating pattern. That is, the target gas passes through piping 36i connected to port R of solenoid valve 32a, then through piping 36h, 38e, and 38f, and is exhausted from exhaust port 11c.

[0052] As described above, in the first operating pattern, the target gas is sent to the sensor 33d, and the sensor 33d measures the target gas. On the other hand, in the second operating pattern, the target gas is not sent to the sensor 33d, and therefore the sensor 33d does not measure the target gas. As described above, the switching between the first and second operating patterns is achieved by controlling the solenoid valve 32a to be energized ON (from port A to port P) and OFF (from port A to port R).

[0053] By switching between the first and second operating patterns at predetermined timings, the time the target gas is supplied to the sensor 33d is limited. By repeatedly switching between Figure 3(a) and (b) (multiple switches), the time the target gas is supplied to the sensor 33d can be limited, preventing premature deterioration of the sensor 33d. The predetermined timing referred to here could be, for example, performed at regular intervals. That is, after a certain amount of time has elapsed since switching to the first operation pattern, switch to the second operation pattern, and after a certain amount of time has elapsed since switching to the second operation pattern, switch back to the first operation pattern.

[0054] <Third operation pattern> The third operation pattern shown in Figure 4(a) will be explained. In the third operating pattern, the on-off valve 31a is energized OFF, the on-off valve 31b is energized ON, the solenoid valve 32a is energized ON, and the solenoid valve 32b is energized OFF. In other words, in the third operating pattern, the solenoid valves 32a and 32b are the same as in the first operating pattern described above, but the ON / OFF states of the on-off valves 31a and 31b are reversed.

[0055] Therefore, the supplied cleaning gas passes through pipes 38a, 36g, 36f, 38b, 38c, 38d, 36c, 36h, 38e, and 38f and is exhausted from the exhaust port 11c. In other words, in the third operation pattern, it passes through the same flow path as the target gas in the first operation pattern. This allows the target gas remaining in the flow path to be expelled from the flow path and also cleans the target gas flow path. As a result, the flow path of the main body 11 can be returned to a clean state by the cleaning gas.

[0056] Furthermore, since the cleaning gas passes through sensors 33a to 33d in the third operation pattern, sensors 33a to 33d can be cleaned after the target gas measurement. In addition, by measuring the cleaning gas with sensors 33a to 33d in the third operation pattern, it can be confirmed that the system has returned to the state before the target gas measurement. Furthermore, it is conceivable to calibrate sensors 33a to 33d by periodically flowing calibration gas through them using the first or third operating pattern.

[0057] In this way, by switching from the first or second operation pattern to the third operation pattern at the timing after the measurement of the target gas, it becomes possible to return the flow path and sensors 33a to 33d to their state before the measurement of the target gas. In the third operation pattern described above, the solenoid valve 32a is kept constantly energized to allow time for the cleaning gas to clean the sensor 33d, but this is not the only option. In other words, it is conceivable to clean the piping 36i by providing a period during which the solenoid valve 32a is turned OFF.

[0058] <Fourth Operation Pattern> The fourth operation pattern shown in Figure 4(b) will be explained. The fourth operation pattern is performed after the third operation pattern described above. In the case of the fourth operation pattern, the on-off valve 31a is energized OFF, the on-off valve 31b is energized ON, the solenoid valve 32a is energized ON, and the solenoid valve 32b is energized ON. In other words, in the fourth operation pattern, the on-off valves 31a, 31b and the solenoid valve 32a are the same as in the third operation pattern described above, but the ON / OFF state of the solenoid valve 32b is reversed.

[0059] Therefore, the supplied cleaning gas flows from port A to port P via solenoid valve 32b, and then flows through piping 36e connected to port P. In other words, in the fourth operating pattern, the cleaning gas supplied from intake port 11b is not exhausted from exhaust port 11c, but rather from intake port 11a.

[0060] As a result, the fourth operation pattern allows for the cleaning of piping 36a, which cannot be cleaned in the third operation pattern. In addition, the cleaning gas exhausted from the intake port 11a can clean the upstream flow path connected to piping 36a. Furthermore, sensor cleaning is also performed in the fourth operation pattern. In other words, sensor cleaning is performed during cleaning in both the third and fourth operation patterns.

[0061] The upstream flow path referred to here is the flow path through which the target gas flows during measurements in the first and second operation patterns described above. The upstream flow path is an external flow path, such as a tube, located outside the main body 11.

[0062] This external flow path is a channel connecting the main body 11 to the lid 16b of the container 16 (see Figure 1). The external flow path includes the duct 24 (see Figure 1) on the side of the source of the target gas (container 16). Even if the external flow path is several meters long, cleaning can be performed by the pressure of the cleaning gas.

[0063] Here, we will explain in more detail the third operation pattern shown in Figure 4(a) and the fourth operation pattern shown in Figure 4(b). In the third operation pattern, the target gas passes through at least a portion (pipes 36f, 38b, and 38c) of the path (pipes 36a, 36d, 36b, 36f, 38b, and 38c) through which the target gas is guided to sensors 33a to 33d in the first or second operation pattern (Figure 3). This configuration for the third operation pattern is also present in the fourth operation pattern.

[0064] In the third operating pattern, the cleaning gas is guided to sensors 33a-33c via pipes 38a, 36g, 36f, and 38b, and also to sensor 33d via pipe 38c. Note that pipe 36f, into which the cleaning gas flows, is located upstream of sensors 33a-33d. In the fourth operation pattern, the cleaning gas that has passed through sensors 33a to 33d is guided to pipe 36a via pipe 36e. Pipe 36a is located further upstream than pipe 36f. The cleaning of sensors 33a to 33d with cleaning gas is performed in both the third and fourth operation patterns. The third operation pattern is an example of the first embodiment, and the fourth operation pattern is an example of the second embodiment.

[0065] As described above, the first operation pattern (see Figure 3(a)) and the second operation pattern (see Figure 3(b)) are repeated during the measurement time to prevent deterioration of the sensor 33d. Then, during the subsequent cleaning time, the process is divided into two parts, with the third operation pattern performed once and the fourth operation pattern performed once. This allows for cleaning of the entire flow path and the inlet nozzle. The above process is repeated during the subsequent measurement time. In addition, besides the case of one measurement followed by one cleaning, other examples such as two measurements followed by one cleaning are also conceivable. The combination of the number of measurements and cleanings is not limited to these.

[0066] <Example of operation flow for manufacturing system 1> Figure 5 illustrates an example of the operation flow in the manufacturing process, shown step by step in the order of (a) to (e). The figure shows one measurement that is repeatedly performed in the manufacturing process. In each of (a) to (e) of the figure, a general valve symbol is shown superimposed on the piping 21 and duct 24 (see Figure 1) described above. This indicates whether the piping 21 and duct 24 are in an open state where fluid is flowing or in a closed state where fluid is not flowing.

[0067] In the first stage shown in Figure 5(a), the main unit 11 is cleaned after the previous measurement has been performed as preparation for the next measurement. This cleaning is performed either before the next measurement or after the previous measurement. The cleaning in the first stage is performed according to the third operation pattern shown in Figure 4(a) above. That is, in the first stage, the pipe 21 is open and cleaning gas is flowing through the pipe 21, while the duct 24 is closed and no target gas is flowing through the duct 24. Furthermore, depending on the timing, the cleaning in the first stage may include not only the third operation pattern shown in Figure 4(a), but also the fourth operation pattern shown in Figure 4(b).

[0068] In the second stage shown in Figure 5(b), the raw materials are transferred from the box 40 to the container 16, and if the container has a lid, the lid 16b is brought close to the container 16. This creates a flow path from the lid 16b through the duct 24 to the piping 36a, etc., inside the main body 11. This flow path is connected to the measurement line of the main body 11 (see the first and second operation patterns in Figures 3(a) and (b)). In this way, the raw materials in container 16 can be brought closer to the measurement line. The measurement line makes it possible to supply the target gas to the measurement area of ​​sensor 33a, etc. (see Figure 2).

[0069] In this embodiment, as shown in Figure 5(a), the raw materials are in a box 40, and as shown in Figure 5(b), they are transferred to a container 16, but the embodiment is not limited to these. The raw materials may be in general packaging boxes such as cardboard boxes, or in plastic containers. It is also possible that the raw materials are in the container 16 from the beginning.

[0070] To elaborate further, in the second stage, just like in the first stage, cleaning is performed as preparation for the next measurement. It should be noted that, depending on the timing, the cleaning in the second stage may include not only the fourth operation pattern shown in Figure 4(b), but also the third operation pattern shown in Figure 4(a).

[0071] In the third stage shown in Figure 5(c), the piping 21 is closed and no cleaning gas is flowing through it, while the duct 24 is open and the target gas, which is the raw material of the container 16, is flowing through the duct 24. In the third stage, the cleaning with the cleaning gas is completed and measurement of the target gas supplied to the main body 11 has begun. The target gas is supplied from the container 16 to the main body 11 by suction using the pump 35 (see Figure 2) and by the fan 24a (see Figure 1) in the duct 24. It is also conceivable that the target gas be supplied by either the pump 35 (see Figure 2) or the fan 24a (see Figure 1).

[0072] To further explain, the measurement in the third stage is performed according to the first and second operation patterns shown in Figures 3(a) and (b) above. That is, by switching the flow path using the solenoid valve 32a when measuring the target gas, the time for which the target gas is sent to the sensor 33d is limited, as described above.

[0073] Subsequently, control is initiated in the main unit 11. This will be explained below. First, upon receiving electrical signals (I / O) from the control device 14 (see Figure 1), the control device 14 (see Figure 1) holds the initial values ​​of each of the sensors 33a to 33d. The first specified time, for example a seconds, is used to switch the suction to the measurement line, and measurement by sensors 33a to 33d is started.

[0074] The values ​​of sensors 33a to 33d after a second specified time has elapsed since the start of measurement, for example, after b seconds, are sent to the control device 14 (see Figure 1). The control device 14 stores the value obtained by subtracting a pre-held initial value from the acquired value of b seconds as measurement data, along with information such as the time. For example, multiple measurement data can be overwritten or appended to a CSV (Comma Separated Values) file separated by commas.

[0075] Furthermore, the control device 14 determines the result by comparing the CSV measurement data with the threshold value of the measurement sample. In other words, when the measurement data and the threshold value are numerically compared, the device determines it to be OK if the measurement data does not exceed the threshold value, and NG otherwise. Once the control device 14 has completed the determination, it retains the determination result. This completes the third stage, and the device moves on to the fourth stage. The threshold values ​​used here are predetermined values ​​depending on the type of raw material. This makes it possible to determine spoilage for multiple types of raw materials. The control device 14 can transmit the measurement completion and judgment results to the manufacturing line 17 as electrical signals (I / O).

[0076] In the fourth stage shown in Figure 5(d), the lid 16b is removed from the container 16, and the measurement line is returned to its original position. The measurement is complete, and cleaning is performed. In the fourth stage, duct 24 is in a closed state. In the fourth stage, pipe 21 is open, and cleaning gas flows through pipe 21. The cleaning gas in pipe 21 is supplied to pipe 38a (see Figure 2) inside the main body 11. As a result, the sensor 33a, etc. (see Figure 2) is cleaned at a timing after the measurement performed in the third stage. That is, the element is cleaned by blowing cleaning gas onto the sensor 33a, etc. The element cleaning is performed in the cleaning line according to the third operation pattern shown in Figure 4(a). This is a switch from the measurement line to the cleaning line. In the fourth stage, the element cleaning using the third operating pattern involves flowing cleaning gas into the measurement line where the target gas had been flowing for a third specified time, for example, c seconds, thereby replacing the target gas with the cleaning gas.

[0077] In the fifth stage, shown in Figure 5(e), cleaning is also performed using a cleaning gas. The cleaning in the fifth stage is carried out according to the fourth operation pattern shown in Figure 4(b). Therefore, in the fifth stage, the cleaning gas is discharged from the intake port 11a of the housing 11K (see Figure 4(b)) through the duct 24 and out of the suction nozzle or inlet (see reference numeral 16d in Figure 6) of the lid 16b (see Figure 1). This cleans the uncleaned portion of the duct 24 that was not cleaned in the fourth stage. The suction path of the target gas can also be cleaned. In this way, the fifth stage involves cleaning the duct 24 (see Figure 1). In the fifth stage, the cleaning of the duct 24 using the fourth operation pattern involves flowing the cleaning gas for a specified fourth time, for example, d seconds. Alternatively, a preset threshold can be set, and the cleaning gas is flowed until the value falls below that threshold.

[0078] Here, we will explain an example of time allocation in terms of the cycle time, which is the time taken for cleaning and measurement in one container 16. If the cycle time is 2 minutes, measurement is performed in 1 minute (first and second operation patterns), sensor cleaning is performed in 40 seconds (third operation pattern), and the remaining 20 seconds are used to clean the uncleaned piping. In this example, the sum of the above-mentioned a-second and b-second periods is 1 minute, which can be called the measurement time. Also, the above-mentioned c-second period is 40 seconds, and the above-mentioned d-second period is 20 seconds. The sum of the above-mentioned c-second and d-second periods is 1 minute, which can be called the washing time. In the example above, both the measurement time and the cleaning time are 1 minute, meaning they are of the same length. However, the measurement time and cleaning time are not necessarily the same length. In other words, the measurement time and cleaning time can be different. This could be the case when the measurement time is longer than the cleaning time, or when the measurement time is shorter than the cleaning time. During cycle time, all time not spent measuring is dedicated to cleaning. The aforementioned a, b, c, and d seconds can be changed, for example, depending on the type of target gas. In other words, the time it takes to send the target gas to the gas sensor and the time it takes to send the cleaning gas to the gas sensor can be changed.

[0079] If the result of the judgment, which is made by comparing the measurement data with the threshold, is OK, then, for example, the result can be communicated to the manufacturing line 17, and the manufacturing line 17 can be stopped once. This determination is based on the alcohol concentration of the target gas generated from the raw material, and determines whether or not the raw material can be used. Products produced using such raw materials include, but are not limited to, food and beverages; for example, cosmetics.

[0080] Figure 6 is a diagram illustrating the container 16 and the lid 16b. As shown in Figure 6, a lid 16b is attached so as to cover the opening 16a of the container 16. The fan 16c described above is attached to the underside of the lid 16b. The lid 16b is also provided with the suction port 16d described above, which connects to the duct 24. The suction port 16d is the part that draws in the target gas from inside the container 16. Note that the suction port 16d shown in Figure 6 can be understood as being shaped like the lid of the container 16. A container 16 with a lid 16b attached is an example of a container.

[0081] Container 16 contains raw material G. Raw material G is, for example, food. In this embodiment, the amount of raw material G may vary. Here, we consider the case where only about half is present. In this case, we consider the case where the target gas generated from raw material G is drawn in through the intake port 16d of the lid 16b. When container 16 is covered with lid 16b, airflow inside container 16 is difficult to achieve. If there is little or no airflow inside container 16, the target gas will be concentrated at the bottom of container 16, making it difficult to draw the target gas in through the intake port 16d.

[0082] However, in this embodiment, a fan 16c is attached to the underside of the lid 16b. When the fan 16c is activated, an airflow in the vertical direction, as indicated by the arrow in Figure 6, is generated, and the air inside the container 16 is agitated. This agitation action causes convection, which helps to equalize the distribution of the target gas inside the container 16. As a result, the concentration of the target gas inside the container 16 can be made uniform. In other words, it becomes possible to reduce the difference between the concentration of the target gas drawn in from the intake port 16d and the concentration of the target gas near the raw material G. Thus, even when the amount of raw material G is small relative to the volume of container 16, it becomes possible to quickly aspirate the target gas in container 16 at the required concentration. This enables continuous measurement with a short cycle time and allows for repeated measurements even during a continuous production process. This makes it possible to efficiently draw in the target gas to be measured through the intake port 16d. Fan 16c is an example of a fan located inside a container.

[0083] Furthermore, it is conceivable to time the operation of fan 16c to precede the intake of the target gas. In other words, it is conceivable to control the operation of fan 16c to stop after the time has elapsed for the concentration of the target gas to become uniform, thereby allowing the target gas to be drawn in. Furthermore, this is not the only option; it is also conceivable to control the fan 16c to draw in the target gas without stopping its operation.

[0084] In this embodiment, the concentration of the target gas in the container 16 is made uniform by agitating the air inside the container 16 through the operation of the fan 16c. However, the agitation method is not limited to this. For example, concentration uniformity could be achieved by vibrating the container 16, or by using thermal convection caused by changing the temperature. Furthermore, means other than agitating the air inside the container 16 can also be considered. For example, a modified method is to use a pipe (not shown) that changes the distance from the intake port 16d to the raw material G when drawing in the target gas, thereby drawing in the target gas of the raw material G at an optimal position.

[0085] Figure 7 is a block diagram illustrating the functions of the control device 14. As shown in Figure 7, the control device 14 includes a timing unit 51, a suction control unit 52, a measurement control unit 53, a cleaning control unit 54, and a transmission unit 55. The timing unit 51 measures the elapsed time after the start of measurement. The suction control unit 52 controls the operation of the pump 35 (see Figure 2) of the main unit 11 when sucking up the target gas and when sucking up the cleaning gas. The suction control unit 52 also controls the operation of the fan 24a (see Figure 1) of the duct 24.

[0086] The measurement control unit 53 controls the execution of the first and second operation patterns, which are the measurement lines. The measurement control unit 53 also acquires measurement data and makes decisions based on it. The cleaning control unit 54 controls the execution of the third and fourth operation patterns, which are the cleaning lines. The transmitting unit 55 sends at least one of the measurement data and the judgment result to a server device (not shown) via a network. The transmitting unit 55 also sends at least one of the measurement data and the judgment result to the monitoring device 18 (see Figure 1).

[0087] Figure 8 is a flowchart showing an example of processing in the control device 14. In the processing example shown in Figure 8, the suction control unit 52 starts suctioning the target gas (step 101). The suctioning of the target gas is performed by the suction control unit 52 of the control device 14 (see Figure 7) operating the pump 35 (see Figure 2).

[0088] The concentration of the aspirated target gas is measured for a predetermined period of time (step 102). Specifically, the measurement control unit 53 (see Figure 7) acquires the detection results from sensors 33a to 33d (see Figure 2). This measurement is performed by switching between a first operation pattern (see Figure 3(a)) and a second operation pattern (see Figure 3(b)) for aspirating the target gas. The predetermined time referred to here is an example of a predetermined first time.

[0089] Then, the measurement control unit 53 (see Figure 7) determines whether the target gas is OK or NG based on the acquired detection results (step 103). This determination is made by numerically comparing the detection result with a threshold value corresponding to the type of target gas. More specifically, if the target gas does not exceed the threshold value, it is determined to be OK; otherwise, it is determined to be NG. Alternatively, the determination of OK or NG can be made based on the change in the measured value over time. In other words, one example is to make the determination based on the slope of the concentration change. If the slope of the concentration change is steep, it can be judged as NG, and if the slope is small, it can be judged as OK.

[0090] The judgment results are stored in a server device (not shown) connected via the network. Alternatively, the judgment results may be transmitted to the monitoring device 18 (see Figure 1) by the transmission unit 55 (see Figure 7) of the control device 14. Furthermore, a modified version is conceivable in which the monitoring device 18 displays the judgment results and notifies the user. Furthermore, it is also conceivable that the control device 14 may retain the judgment result at the same time as, or instead of transmitting, it to the monitoring device 18 (see Figure 1).

[0091] Once the measurement is complete, cleaning with cleaning gas begins. That is, the cleaning control unit 54 (see Figure 7) of the control device 14 controls the cleaning process. This will be explained in detail below. The sensor is cleaned in the third operation pattern (see Figure 4(a)) (step 104). Then, in the fourth operation pattern (see Figure 4(b)), pipes and other parts that cannot be cleaned in the third operation pattern are cleaned (step 105). In the fourth operation pattern, as described above, the duct 24 (see Figure 2) is also cleaned.

[0092] The control device 14 then determines whether a predetermined time has elapsed using the timing unit 51 (see Figure 7) (step 106). If the predetermined time has not elapsed (No in step 106), the process returns to step 104. If the predetermined time has elapsed (Yes in step 106), the process proceeds to step 107. This makes it possible to execute a continuous production process using the cycle time. Alternatively, the determination could be made based on whether the time falls below a predetermined threshold instead of time. The predetermined time referred to here is an example of a second predetermined time.

[0093] For example, if the cycle time is 2 minutes, and the cleaning in the third operation pattern is 40 seconds, and the cleaning in the fourth operation pattern is 20 seconds, then one 40-second cleaning cycle in the third operation pattern and one 20-second cleaning cycle in the fourth operation pattern will be performed. However, this is not the only option. For example, the 40-second wash in the third operating pattern may be divided into, for example, five separate washes, and the 20-second wash in the fourth operating pattern may also be divided into five separate washes. In this case, each wash in step 104 described above takes 8 seconds, and each wash in step 105 described above takes 4 seconds. When washing, the switching between the third and fourth operating patterns is repeated multiple times, and then the target gas is aspirated to begin the measurement.

[0094] Step 107 determines whether to terminate the measurement. If you choose to terminate the measurement (Yes in step 107), the series of processes ends. If you choose not to terminate the measurement (No in step 107), return to step 101.

[0095] Here, the suction of the target gas can be performed after cleaning with the cleaning gas by switching between the third operation pattern (see Figure 4(a)) and the fourth operation pattern (see Figure 4(b)) once, or after cleaning with the cleaning gas by switching multiple times. In the former case, cleaning is performed using either the third or fourth operation pattern, then a switch is performed once to clean with the other pattern, and then the target gas is suctioned. Multiple such switches may be performed.

[0096] Furthermore, the predetermined time for measurement in step 102 and the predetermined time for cleaning in step 106 may be the same, or they may be different. In other words, they can be set individually.

[0097] Figure 9 is a graph showing the test results of the measurement of manufacturing system 1, with the vertical axis representing the sensor measurement value and the horizontal axis representing the measurement time (s) as the elapsed time from the start of measurement. Line A1, shown as a solid line, represents the case of air. Line B1, shown as a dashed line, represents the case of target gas C1, and line B2, shown as a dotted line, represents the case of target gas C2.

[0098] Note that the air used is fresh air and is the same air used as the cleaning gas. Target gas C1 is the gas generated when raw material G (see Figure 6) has begun to decompose. Target gas C2 is the gas generated when raw material G (see the same figure) has decomposed further to the point where its edibility has been compromised. In addition, during the measurement test, the target gases C1 and C2 are drawn in while the container 16 (see Figure 6), which contains about half of the raw material G, is forcibly agitated by a fan 16c.

[0099] The line A1 shown in Figure 9 is an upward-sloping curve. That is, as shown by line A1, in the case of air, the sensor measurement value increases smoothly with elapsed time. Line B1 consists of a roughly straight line sloping upwards to the right, a descending line that repeatedly goes down and up before descending, and a roughly horizontal line that appears afterward. Line B2 consists of a roughly straight line sloping upwards to the right more steeply than line B1, a descending line, and a roughly horizontal line. Lines B1 and B2 show a faster increase in sensor readings than line A1.

[0100] To explain further, as shown in Figure 9, at the point of 120 seconds, indicated by the dashed vertical line, the difference between line A1 and lines B1 and B2 is significant, making it possible to detect the target gases C1 and C2.

[0101] Figures 10 and 11 illustrate the verification process when using a gas sensor to measure the target gas. Figure 10 is a graph where the vertical axis represents the sensor measurement value and the horizontal axis represents the measurement time (s). Figure 11 is a table showing the difference between the start and end of the measurement by the sensor. As shown in Figure 10, the target gas C1 was measured after measuring the air multiple times. More specifically, for the air, a series of operations consisting of measurement using the first and second operation patterns and cleaning using the third and fourth operation patterns was performed six times. Subsequently, for the target gas C1, a series of operations consisting of measurement using the first and second operation patterns and cleaning using the third and fourth operation patterns was performed once. The cycle time was 2 minutes (120 seconds).

[0102] In Figure 10, the measurement results for air from the first to the sixth measurement are shown as line A3, and the measurement result for the target gas C1 is shown as line B3. Sensor measurements are performed not only in the first and second operation patterns for measuring the target gas, but also in the third and fourth operation patterns for air cleaning. Therefore, line A3 is continuous from measurement time 0 to 720 seconds, and line B3 is continuous with line A3 and extends from 720 to 840 seconds. In the third and fourth operating patterns as well, measurements can be taken using the sensor to determine whether the sensor is functioning normally or abnormally. Furthermore, if the sensor deteriorates, the detection accuracy can be restored by correcting the threshold using calibration gas, thereby extending the system's lifespan.

[0103] As shown in Figure 10, line A3 is not stable at measurement times of 0-120 seconds (first air application) and 120-240 seconds (second air application). However, after multiple air applications, line A3 becomes stable at elapsed times of 240-360 seconds (third air application), 360-480 seconds (fourth air application), 480-600 seconds (fifth air application), and 600-720 seconds (sixth air application).

[0104] Subsequently, line B3, shown at 720-840 seconds (target gas C1, first time), shows a different change from line A3.

[0105] In the vertical direction of Figure 11, the above-mentioned "Air 1st time" to "Air 6th time" and "Target gas C1, 1st time" are listed from top to bottom. The "difference value between the start and end of measurement by the sensor" for each is also listed. For "Air 1st time" to "Air 6th time," the difference value is less than 1, while for "Target gas C1, 1st time," the difference value is 1 or greater. Therefore, by setting a threshold for this difference value, it is possible to detect the target gas. For target gas C1, setting the threshold to, for example, 1.00 makes it possible to measure the target gas.

[0106] In the embodiment described above, for example, a gas concentration measurement method is implemented in which the target gas is aspirated for 1 minute out of a 2-minute cycle time, the concentration of the aspirated target gas is measured by sensors 33b to 33d (see, for example, Figure 2), and sensors 33b to 33d are washed with a cleaning gas for 1 minute after the measurement. Furthermore, in this embodiment, a mechanism is activated to adjust the target gas generated from the raw material G (see, for example, Figure 6) contained in the container 16 to a concentration suitable for measurement, and the target gas drawn into the measurement area including sensors 33b to 33d is then drawn into the measurement area and measured by sensors 33b to 33d in order to measure its gas concentration. Furthermore, in this embodiment, a normal / abnormal determination direction is implemented to determine whether the raw material is normal or abnormal based on the measurement results using the gas concentration measurement method described above.

[0107] As described above, according to this embodiment, it is possible to determine whether the raw materials are normal or abnormal based on the measurement results of the target gas. Furthermore, in continuous production, the condition of the raw materials can be repeatedly checked by sensor detection at predetermined time intervals.

[0108] Furthermore, according to this embodiment, by repeatedly measuring the concentration of an example of the target gas, alcohol, and cleaning the gas sensor with a cleaning gas in a short period of time, it is possible to accommodate a continuous production process with a short cycle time. In other words, one measurement is followed by one cleaning, and this is repeated.

[0109] Although embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the embodiments described above. It is clear from the claims that various modifications or improvements to the above embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0110] 1...Manufacturing system, 11...Main unit, 14...Control device, 16...Container, 16b...Lid, 16c...Fan, 24a...Fan, 31a, 31b...On / off valve, 32a, 32b...Solenoid valve, 33a~33d...Sensor, 51...Timer, 52...Suction control unit, 53...Measurement control unit, 54...Washing control unit

Claims

1. A mechanism is activated to adjust the target gas, which is generated from the raw materials contained in the container and drawn into the measurement area including the gas sensor, to a concentration suitable for measurement. The target gas, after the mechanism has been activated, is drawn into the measurement area and measured by the gas sensor. Method for measuring gas concentration.

2. The aforementioned mechanism is a mechanism for stirring the target gas within the container. The method for measuring gas concentration according to claim 1.

3. The container is a container with a lid, The stirring is performed by the operation of a fan provided on the lid. The method for measuring gas concentration according to claim 2.

4. The container is a container with a lid, The lid is provided with a suction port for drawing in the target gas. The method for measuring gas concentration according to claim 1.

5. A mechanism is activated to adjust the target gas, which is generated from the raw materials contained in the container and drawn into the measurement area including the gas sensor, to a concentration suitable for measurement. The target gas after the mechanism has been activated is drawn into the measurement area and measured by the gas sensor. Based on the results of the above measurement, the normal or abnormal state of the raw material is determined. Methods for determining normality and abnormality.

6. The determination of whether the raw materials are normal or abnormal is made based on a threshold value for the measured value or the change in the measured value over time. The method for determining normality or abnormality according to feature 5.

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