JP2019101948A - Conduction heating detection system and detection method - Google Patents

Abstract

To provide a detection system and method of conduction heating capable of detecting ignition in a simple and reliable manner due to conduction heating of a wood structure behind a wall of a kitchen and capable of reliably preventing a fire.SOLUTION: A detection system comprises: a reference point 32 relatively far from a heating cooker 12, on a wall near the heating cooker 12; and an infrared radiation temperature sensor 24 that measures a temperature of a measurement point 30 closer to the heating cooker 12 than the reference point 32. A detection system comprises: a control unit 26 that compares temperatures of the reference point 32 and the measurement point 30; and a notification unit 28 operated by an abnormality notification signal output from the control unit 26. When it is determined that a change with a passage of time of a temperature difference between the reference point 32 and the measurement point 30 after cooking is normal according to a predetermined reference, the abnormality notification signal is not output from the control unit 26. When it is determined that a change with a passage of time of a temperature difference between the reference point 32 and the measurement point 30 is abnormal according to the predetermined reference, the abnormality notification signal is output from the control unit 26 and the notification unit 28 operates in response to the abnormality notification signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a system and method for detecting conduction heating provided in a kitchen of a wooden house.

  In the past, a flame hood and a temperature sensor were installed on the range hood provided in the kitchen, and it was detected that the heating cooker located below the range hood had a fire, and that the temperature was abnormally high. There is something to prevent in advance. For example, in the fire interlocking method of Patent Document 1, a fire detection unit and a control unit are attached to a range hood located above the electromagnetic induction heater, the electromagnetic induction heater and the vicinity thereof being a fire detection range. When the fire detection unit transmits a fire signal to the control unit via the signal line, the control unit operates the storage unit that stores the fire signal in time, and when the storage time reaches a predetermined time, for example, 10 seconds, The control unit transmits an output signal through the signal line to sound the sound device of the fire alarm unit, and operates and activates each safety device to stop the energization. This will prevent the spread of fires.

  Moreover, the heating cooker of patent document 2 provides the temperature detection element which detects the temperature of this electromagnetic induction heater in the ventilation fan hood installed above the electromagnetic induction heater, The abnormal temperature detection by detection of this temperature detection element Shut off the power supply to the electromagnetic induction heater. This prevents the occurrence of an abnormal situation such as a fire in advance.

JP 2005-300114 A JP 2012-178300 A

  In the case of the above-mentioned background art, all detect the abnormal temperature and flame of a cooking-by-heating machine, and do not detect the abnormal temperature of the wall around a cooking-by-heating machine. In recent years, the number of fires that may be caused by conduction heating has increased. These fires originate from the kitchen that covers the indoor side of the wall near the heating cooker with a highly fireproof stainless steel plate in a wooden house, and when the stainless steel plate becomes hot, the wooden plate on the back side of the stainless steel plate The structure is carbonized by long-term conductive heating, and leads to spontaneous ignition due to residual heat during cooking or after cooking.

  Therefore, since the indoor side of the wall is covered with a stainless steel plate and does not burn at the beginning of a fire, detection is delayed in a conventional fire detection method for sensing flames and smoke, resulting in a large fire. In addition, a fire caused by such conductive heating may occur at a time when the worker is absent after cooking is completed, for example, it may occur 50 minutes after the worker leaves the kitchen. From the point of view, the fire extinguishing is delayed and the damage will be large. In old wooden houses, there are many kitchens where the cooker pot is only a few centimeters away from the stainless steel plate of the wall, and there is a high possibility of a fire caused by conduction heating. Therefore, there is a need for a method of quickly detecting the fire of the wooden structure on the back side of the stainless steel plate.

  The present invention has been made in view of the above-mentioned problems of the background art, and a detection system for conduction heating capable of detecting ignition due to conduction heating of a wood structure on the back side of a kitchen wall in a simple and reliable manner. And providing a detection method.

  The present invention relates to a temperature sensor that measures the temperature of a measurement point on a side surface of a room near a heat source that performs heat treatment, a control unit that performs a predetermined process based on the temperature of the measurement point, and an abnormality that the control unit outputs. There is provided a notification unit operated by a notification signal, and the control unit determines that the change with the passage of time of the temperature of the measurement point after the heating process by the heat source is normal according to a predetermined standard. And outputting the abnormality notification signal from the control unit when the control unit does not output the abnormality notification signal and it is determined that the change with the passage of time of the temperature of the measurement point is abnormal according to the predetermined reference, It is a detection system of the conduction heating which the above-mentioned notice unit operates by the above-mentioned unusual notice signal.

  Further, according to the present invention, there is provided a temperature sensor for measuring the temperature of a reference point relatively distant from the heat source on the side of the room near the heat source to be heat-treated and the temperature of the measurement point closer to the heat source than the reference point A control unit that compares the temperature of the point and the measurement point, and a notification unit that operates according to an abnormality notification signal output by the control unit, the control If the difference in temperature at the measurement point is smaller than the predetermined value after a predetermined time, the controller does not output an abnormality notification signal, and the difference between the temperature of the reference point and the temperature at the measurement point is predetermined after the predetermined time The detection system according to the present invention is a conductive heating detection system in which an abnormality notification signal is output from the control unit and the notification unit is operated based on the abnormality notification signal when the values are not smaller than the same value or larger.

  Alternatively, when it is determined that the change with the passage of time of the difference between the temperature of the reference point and the measurement point after the heat treatment operation by the heat source is normal according to a predetermined reference, the control unit performs the control When it is determined that the change over time of the difference between the temperature of the reference point and the measurement point is abnormal according to the predetermined reference, the control unit does not output an abnormality notification signal from the control unit. A signal may be output, and the notification unit may be operated by the abnormality notification signal.

  Further, according to the present invention, there is provided a first temperature sensor for measuring the temperature of a measurement point or measurement area on a side surface in the vicinity of a heat source to be heat treated, and a reference area of a wider range including the measurement point or measurement area. A control unit that compares a second temperature sensor that measures an average temperature, the temperature of the measurement point or measurement area obtained by the first temperature sensor, and the average temperature obtained by the second temperature sensor And a notification unit operated by an abnormality notification signal output from the control unit, the control unit being configured to calculate an average temperature of the reference area after a heating process by the heat source and a temperature of the measurement point or measurement area. When it is determined that the change with the passage of time of the difference is normal according to a predetermined reference, the control unit does not output an abnormality notification signal, and the average temperature of the reference area and the measurement of the reference area When it is determined that the change with the passage of time of the difference with the temperature of the point or the measurement area is abnormal according to a predetermined reference, an abnormality notification signal is output from the control unit, and the notification is output by the abnormality notification signal. It is a conductive heating detection system in which the unit operates.

  The heat source is a heating cooker, the indoor side surface is a wall of a kitchen, and the temperature sensor is provided on a range hood located above the heating cooker. The temperature sensor is an infrared radiation temperature sensor, and one or more measurement points are provided.

  The present invention measures the temperature at a measurement point on the side of the room near the heat source to be subjected to the heat treatment, and the change over time of the temperature at the measurement point after the heat treatment by the heat source is normal according to a predetermined standard. If it is, it is judged that there is no abnormality, and if the change with the passage of time of the temperature at the measurement point deviates from a predetermined reference, it is judged that there is an abnormality and a detection method of conduction heating which issues an abnormal temperature detection alarm is there.

  Further, according to the present invention, the temperature of a reference point relatively distant from the heat source and a measurement point closer to the heat source than the reference point is measured on the side of the room near the heat source to be heat treated. The change over time of the temperature difference between the reference point and the measurement point is determined to be normal if it is normal according to a predetermined standard, and the change over time of the difference between the temperature of the reference point and the measurement point is When the change deviates from a predetermined reference, it is determined that there is an abnormality, and this is a method of detecting conduction heating which issues an abnormal temperature detection alarm.

  Further, the present invention measures the temperature of the measurement point or measurement area on the indoor side near the heat source to be heat-treated, and measures the average temperature of the reference area which is a wider range including the measurement point or measurement area. If the change with the passage of time of the difference between the average temperature of the reference area and the temperature of the measurement point or measurement area after the heat treatment work with the heat source is normal according to a predetermined standard, it is determined that there is no abnormality Conducting heating which issues an abnormal temperature detection alarm by judging that there is an abnormality if the change with the lapse of time of the difference between the average temperature of the reference area and the temperature of the measurement point or measurement area deviates from a predetermined standard. Detection method.

  The conductive heating detection system and detection method of the present invention can detect the ignition by conductive heating of the wood structure behind the wall of the kitchen simply and reliably. Furthermore, since the temperature is detected by the change with time of the measurement point, the overheating inside the structure can be detected promptly. In addition, when the ignition is detected by the temperature difference between the reference point far from the heating cooker and the measurement point near the heating cooker on the wall near the heating cooker, the judgment is made based on relative values. , Emissivity correction etc. is unnecessary, and simple and accurate judgment is possible.

FIG. 1 is a schematic view of a conductive heating detection system according to an embodiment of the present invention. It is the schematic which shows the time of heat cooking of the detection system of the conduction heating of this embodiment. It is a flowchart which shows the detection method of the conduction heating of this embodiment. It is the schematic which shows the detection range of the wall near the heating cooker of the detection method of the conduction heating of other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described based on the drawings. 1 and 2 show an embodiment of the present invention, and the detection system 10 for conduction heating of this embodiment is provided in a kitchen 11 of a wooden house. Here, the structure of the kitchen 11 will be described. The wall 16 of the kitchen 11 is formed of a wood structure 18 such as a wall plate or a column, and the surface on the indoor side is covered with a wall material made of paper or synthetic resin. The heat source for performing the heating process is a heating cooker 12 using electricity or gas, and the cooker 12 is provided in contact with the wall 16 and in the vicinity of the heating portion 12 a of the cooker 12 on the wall 16 A stainless steel plate 20 is attached for fire protection. A range hood 22 is provided on the wall 16 above the heating cooker 12.

  The detection system 10 of conduction heating outputs an infrared radiation temperature sensor 24 for measuring the temperature of the stainless steel plate 20 which is the indoor side surface of the wall 16, a control unit 26 connected to the infrared radiation temperature sensor 24, and a control unit 26 A notification unit 28 is provided which operates in response to the abnormality notification signal. The infrared radiation temperature sensor 24 measures the temperature using the infrared radiation 36 emitted from the stainless steel plate 20, and the temperatures of the plurality of measurement points 30 in the indoor side surface of the stainless steel plate 20 near the heating portion 12a. Measure

  Here, six measurement points 30 are provided, and the three measurement points 30 are arranged in one line at equal intervals in the vertical direction, and two lines are spaced apart in parallel in the horizontal direction. Further, the temperature of one reference point 32 other than the measurement point 30 is measured under the same conditions as the measurement point 30. The reference point 32 is on the same side as the measurement point 30 on the indoor side of the stainless steel plate 20 and is farther from the heating portion 12 a than each measurement point 30. In FIG. 1, the measurement point 30 and the reference point 32 are displayed with circles, but the circles are not necessary, and the position detected by the infrared radiation temperature sensor 24 may be set to a predetermined location.

  The measurement method of the plurality of measurement points 30 is, for example, arranging a plurality of detection elements, setting the detection ranges for the detection elements to be different measurement points 30, and detecting signals from the respective detection elements corresponding to each measurement point 30 By changing the detection range by the detection element at any time by controlling the detection element using a motor or the like, or by changing the detection range by the detection element as needed. A detection signal of the measurement point 30 can be output for each measurement point 30, and a detection signal for each measurement point 30 is output.

  The control unit 26 obtains the difference between the temperature of the reference point 32 and the temperature of each measurement point 30 based on the output signal from the infrared radiation temperature sensor 24. If the difference between the temperature of the reference point 32 and the temperature of each measurement point 30 is abnormal, an abnormality notification signal is output to the notification unit 28 and activated. The notification unit 28 performs ringing of the sound device, lighting of a fire light, communication to the outside such as a mobile terminal, and the like according to the abnormality notification signal.

  The infrared radiation temperature sensor 24 of the conduction heating detection system 10 is attached to the lower end face of the range hood 22 in a place that does not interfere with the cooking operation and is not contaminated with smoke or oil splash. The control unit 26 and the notification unit 28 are connected to the infrared radiation temperature sensor 24 by a signal line and attached to an arbitrary place.

  FIG. 2 shows a state in which cooking is performed in the kitchen 11. When the pan 34 is placed on the heating portion 12 a of the heating cooker 12 and cooking is performed, the heat is transmitted to the stainless steel plate 20 and the heat 14 is further transmitted to the wood structure 18 on the back side of the stainless steel plate 20. At each measurement point 30, the temperature rises during cooking and the temperature difference with the reference point 32 becomes large. In addition, the detection system 10 of conduction heating is not operated during cooking, and measurement of temperature is not performed. After completion of the heating and cooking, the pan 34 is lowered from the heating cooker 12 and the detection system 10 of the conductive heating is started after the end of the fire. Even if the worker leaves the kitchen 11 and the kitchen 11 becomes unmanned, the temperature of the wall 16 is measured to detect the presence or absence of ignition of the wood structure 18.

  Since the reference point 32 is apart from the heating cooker 12, the influence of the heat 14 of the heating cooker 12 is small and the temperature is low and close to room temperature. The measurement point 30 has a high temperature because the heat 14 is transmitted by the heating cooker 12 close to the heating cooker 12. Immediately after cooking, the temperature difference between the reference point 32 and the measurement point 30 is maximum, and the temperature of the measurement point 30 decreases with the passage of time, and the temperature difference decreases and eventually becomes the same.

  Next, based on FIG. 3, the detection method of the conduction heating of this embodiment is demonstrated. When the conduction heating detection system 10 is started, the infrared radiation temperature sensor 24 measures the temperatures of the reference point 32 and each measurement point 30 (s1). Next, the difference between the temperature of the reference point 32 and the temperature of each measurement point 30 is determined (s2). The measurement is made twice with a predetermined time difference, and if the second temperature difference is smaller than the first temperature difference, it is judged that the wood structure 18 located on the back side of the stainless steel plate 20 is cooling properly. , Do not issue abnormal temperature detection alarm, judging that there is no possibility of fire occurrence. Then, after a predetermined time, the temperatures of the reference point 32 and the measurement point 30 are measured again to obtain a temperature difference. If the third temperature difference, that is, the current temperature difference is smaller than the second temperature difference, that is, the previous temperature difference, it is determined that there is no possibility of a fire, and an abnormal temperature detection alarm is issued. I do not order. This is repeated a predetermined number of times, a predetermined time, or until a predetermined temperature difference is reached (S3).

  If the first temperature difference and the second temperature difference between the reference point 32 and the measurement point 30 are the same or increase, the wood structure 18 does not cool and heat is generated in the wood structure 18 Indicating that there is a possibility of ignition, and an abnormal temperature detection alarm is issued to operate the notification unit 28 (s4). Then, a notification confirmation of an abnormal temperature detection alarm by a worker or a guard or the like and a solution process for the abnormal temperature detection are performed. Thereafter, the alarm is reset by the reset operation, and the abnormal temperature detection is ended. In addition, conditions, such as a temperature difference and elapsed time which issue an abnormal temperature detection alarm, are freely set suitably.

  According to the conductive heating detection system and detection method of this embodiment, ignition due to conductive heating of the wood structure 18 on the back side of the wall 16 of the kitchen 11 can be detected easily and reliably. A reference point 32 on the wall 16 near the heating cooker 12 which is far from the heating cooker 12 and less affected by the heat 14 of the heating cooker 12 and a measuring point near the heating cooker 12 to which the heat 14 is transmitted from the heating cooker 12 It detects ignition based on changes in temperature with time, is based on relative values, and does not require the emissivity correction required for non-contact temperature sensors and radiation temperature sensors, and is simple and accurate. It is. In addition, there is no installation restriction. Since the wood structure 18 on the back side of the wall 16 can not be seen, and the indoor side of the wall 16 is covered with the stainless steel plate 20 and does not burn in the early stage of the fire, early detection of ignition of the wood structure 18 by visual observation Although not possible, the detection system 10 of conductive heating can detect ignition of the wood structure 18. The initial fire extinguishing operation can be started before a large fire such as the indoor side of the wall 16 is recognized as burning or fire or smoke is detected in the fire notification, and the fire can be extinguished quickly.

  Moreover, since six measurement points 30 are provided, it can be determined accurately. It is possible to monitor the kitchen 11 which has finished cooking and has become unmanned at low cost. The infrared radiation temperature sensor 24 of the conduction heating detection system 10 is attached to the range hood 22 and does not interfere with the cooking operation. The conductive heating detection system 10 is easy to install, can be retrofitted to the range hood 22, and can be used easily.

  In addition, the detection system of the conduction heating of this invention and its detection method are not limited to the said embodiment. For example, as shown in FIG. 4, a first temperature sensor 42 for measuring the temperature of the measurement point 38 or the measurement area 39 of the wall 16 which is an indoor side surface near the heat source to be heat-treated, and the measurement point 38 or the measurement area A second temperature sensor 43 may be provided to measure the average temperature of the reference area 40 which is a wider range including 39. The control unit is provided with a control unit that compares the temperature of the measurement point 38 or the measurement area 39 obtained by the first temperature sensor with the average temperature of the reference area 40 obtained by the second temperature sensor. If the difference between the average temperature of the reference area 40 and the temperature of the measurement point 38 or the measurement area 39 after heating processing by the heat source decreases with time, a control unit is provided. If the difference between the average temperature of the reference area and the temperature of the measurement point or the measurement area 38 does not become smaller than the preset value as time passes and becomes equal to or larger than the preset value without outputting an abnormality notification signal It may be one that outputs an abnormality notification signal. Also, the first temperature sensor 42 and the second temperature sensor 43 switch the detection range of one or more temperature sensors, and measure the temperatures of the measurement point 38 or the measurement area 39 and the reference area 40 alternately. But it is good. The measurement system and the detection method also allow accurate measurement.

  In addition to this, the temperature difference between the measurement point and the reference point may fluctuate depending on the sampling method of the temperature of the reference point and each measurement point or the external thermal noise. Therefore, using the method of judging the tendency of temperature change by the average value, the minimum value or the maximum value in the sampling of the reference point and each measurement point, or the statistical method of estimating the tendency of temperature change Also good.

  In addition, if the temperature of the measurement point is measured by the temperature sensor, the temperature change of the measurement point is observed, and the temperature of the measurement point after the heat treatment by the heat source decreases with time, the anomaly notification signal from the control unit If the temperature of the measurement point does not become smaller than the preset value with the passage of time, and becomes equal or larger, the control unit may output an abnormality notification signal to operate the notification unit. This makes it possible to configure a simple detection system.

  As a determination method according to the predetermined criteria of the present invention, the tendency of the temperature change after the current heating operation and the temperature change after the current heating operation are compared with the time change after the previous heating operation before the current heating operation. It may be determined whether the temperature change is within a predetermined range. For example, if the temperature of the measurement point does not fall below a certain temperature or the temperature difference with the reference point does not decrease even after a certain time has elapsed, it is determined that the abnormality is present. In addition, if it is determined that the temperature of the measurement point, which changes with the passage of time, does not fall below a preset value (threshold) or the temperature difference does not shrink, it may be considered as abnormal. Alternatively, it may be abnormal if the temperature to be changed with the passage of time continues for a fixed period in the same state or if it is determined that the value of the temperature is large.

  Besides, the temperature sensor may be other than the infrared radiation temperature sensor. The position where the temperature sensor is attached may be other than the range hood, and may be attached anywhere as long as it is possible to accurately measure the temperature of the stainless steel plate, such as a ceiling or a shelf. The room to which the detection system for conduction heating is attached may be other than the kitchen, or a measurement point and a reference point may be provided at a place other than the wall near the heating cooker to detect an ignition other than the wall. The function of the notification unit may be other than ringing of a sound device, lighting of a fire light, communication to the outside, and the like.

10 Conduction heating detection system 11 kitchen 12 heating cooker 16 wall 18 wood structure 20 stainless steel plate 22 range hood 24 infrared radiation temperature sensor 26 control unit 28 notification unit 30 measurement point 32 reference point

Claims (9)

Operated by a temperature sensor that measures the temperature at a measurement point on the side of the room near the heat source that performs heat treatment, a control unit that performs a predetermined process based on the temperature at the measurement point, and an abnormality notification signal output by the control unit A notification unit is provided.
The control unit is configured to output an abnormality notification signal from the control unit when it is determined that the change with the passage of time of the temperature of the measurement point after the heat treatment work by the heat source is normal according to a predetermined standard. No, when it is determined that the change with the passage of time of the temperature of the measurement point is abnormal than the predetermined reference, an abnormality notification signal is output from the control unit,
The detection system for conduction heating, wherein the notification unit is operated by the abnormality notification signal. A temperature sensor for measuring the temperature of a reference point relatively far from the heat source on the side surface in the room near the heat source to be heat-treated and the temperature of the measurement point closer to the heat source than the reference point A control unit that compares the temperatures of the control unit and a notification unit that is operated by an abnormality notification signal output from the control unit,
The control unit does not output an abnormality notification signal from the control unit when the difference between the temperature of the reference point and the measurement point after the heating process by the heat source is smaller than a predetermined value after a predetermined time has elapsed. When the difference between the temperature of the reference point and the temperature of the measurement point does not become smaller than a predetermined value after a predetermined time elapses, and outputs the abnormality notification signal from the control unit,
The detection system for conduction heating, wherein the notification unit is operated by the abnormality notification signal. A temperature sensor for measuring the temperature of a reference point relatively far from the heat source on the side surface in the room near the heat source to be heat-treated and the temperature of the measurement point closer to the heat source than the reference point A control unit that compares the temperatures of the control unit and a notification unit that is operated by an abnormality notification signal output from the control unit,
When it is determined that the change with the passage of time of the difference between the temperature of the reference point and the measurement point after the heat treatment work by the heat source is normal according to a predetermined reference, the control unit is When it is determined that the change over time of the difference between the temperature of the reference point and the measurement point does not output an abnormality notification signal, the control unit determines the abnormality notification signal. Output
The detection system for conduction heating, wherein the notification unit is operated by the abnormality notification signal. A first temperature sensor for measuring the temperature of a measurement point or measurement area on the side of the room near the heat source to be heat-treated, and the average temperature of the reference area which is a wider range including the measurement point or the measurement area A control unit that compares a second temperature sensor, the temperature of the measurement point or measurement area obtained by the first temperature sensor, and the average temperature obtained by the second temperature sensor; A notification unit operated by the abnormality notification signal output by the
The control unit is determined that the change with the passage of time of the difference between the average temperature of the reference area and the temperature of the measurement point or the measurement area after the heat treatment work by the heat source is normal according to a predetermined standard In this case, it is determined that the change over time of the difference between the average temperature of the reference area and the temperature of the measurement point or the measurement area is abnormal according to a predetermined standard without outputting an abnormality notification signal from the control unit. When it is turned on, the control unit outputs an abnormality notification signal,
The detection system for conduction heating, wherein the notification unit is operated by the abnormality notification signal.   The conduction according to any one of claims 1 to 4, wherein the heat source is a heating cooker, the indoor side surface is a wall of a kitchen, and the temperature sensor is provided on a range hood located above the heating cooker. Heating detection system.   The conductive heating detection system according to any one of claims 1 to 5, wherein the temperature sensor is an infrared radiation temperature sensor, and one or more measurement points are provided.   The temperature of the measurement point of the indoor side near the heat source to be heat-treated is measured, and the change over time of the temperature of the measurement point after the heat treatment operation by the heat source is abnormal if it is normal according to a predetermined standard A method for detecting conduction heating, characterized by determining that there is no, and when a change with the passage of time of the temperature of the measurement point deviates from a predetermined reference, determines that there is an abnormality and issues an abnormal temperature detection alarm.   The temperature of the reference point relatively distant from the heat source and the measurement point closer to the heat source than the reference point is measured on the side surface of the room near the heat source to be heat-treated, and the reference point after the heat treatment operation by the heat source If the change over time of the temperature difference at the measurement point is normal according to a predetermined criterion, it is judged that there is no abnormality, and the change over time of the difference between the temperature of the reference point and the measurement point is a predetermined When it deviates from a reference | standard, it judges that it is abnormal and issues an abnormal temperature detection alarm, The detection method of the conduction heating characterized by the above-mentioned.   While measuring the temperature of the measurement point or measurement area of the indoor side near the heat source to be heat-treated, the average temperature of the reference area which is a wider range including the measurement point or the measurement area is measured, and heating by the heat source If the change with the passage of time of the difference between the average temperature of the reference area after the processing operation and the temperature of the measurement point or measurement area is normal according to a predetermined standard, it is determined that there is no abnormality; Conduction heating characterized in that if the change with the passage of time of the difference between the average temperature and the temperature of the measurement point or measurement area deviates from a predetermined reference, it is judged as abnormal and an abnormal temperature detection alarm is issued. Detection method.

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