JP2005062979A - Electronic cooler and its diagnostic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the maintenance of an electronic cooler by exactly grasping the operating condition of the cooler, and to improve the measurement accuracy of an analyzing device mounted with the cooler regarding the electronic cooler and its diagnostic system. <P>SOLUTION: The electronic cooler having a detecting means for cooling temperature is characterized by having an arithmetic processing means to judge the operating condition of the cooler from the cooling temperature and the ambient temperature. Also, the diagnostic system of the electronic cooler is characterized by judging the operating condition of the cooler based on a plurality of reference temperatures settable from the characteristics of the electronic cooler. Furthermore, the diagnostic system is characterized by performing a judgment operation including the steps of: comparing the ambient temperature with a reference temperature; comparing the cooling temperature with the reference temperature; and comparing the ambient temperature with the cooling temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic cooler and a diagnostic system thereof, and is particularly useful as a sample fluid dehumidifier such as an environmental measurement device or a dehumidification management system thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an air pollution analysis device such as a generation source analysis device, an environmental air analysis device, or an automobile exhaust gas analysis device, an electronic cooler (hereinafter referred to as “cooler”) is used for dehumidification in a sample fluid. It is used a lot. In addition, coolers are also widely used in chemical processes, as well as analytical devices for component measurement for various research and field use.
[0003]
In general, for example, the cooler shown in FIG. 9 is known (see, for example, Patent Document 1). That is, in FIG. 9, reference numeral 21 denotes a thermo module, which is supported by a pair of support plates 22 and 23 made of an insulating material such as ceramic from both sides, and filled around the entire circumference between the support plates 22 and 23. The cooling module 25 is formed by enclosing the thermo module 21 in the support plates 22 and 23 with the formed sealing wall 24 made of silicon rubber as a sealing material. A heat exchanger 26 is superposed on the support plate 22 which is a cooling surface of the cooling unit 25. In order to improve heat conduction between the heat exchanger 26 and the cooler 25, a silicon grease film is provided. 27 is interposed. Reference numeral 28 denotes a gas supply pipe provided through the heat exchanger 26, to which a sample gas to be dehumidified is supplied. Reference numeral 29 denotes a heat radiating member formed of fins or the like disposed on the support plate 23 side which is the heat radiating surface of the cooling unit 25.
Reference numeral 30 denotes a fixing plate overlaid on the heat exchanger 26, and fixing bolts 31 penetrating the both end block diagrams are screwed into screw holes 32 formed in the heat radiating member 29 so that the heat exchanger 26 and the cooling unit 25 are fixed to each other. Thus, a cooler is configured. In the cooler configured as described above, while the sample gas supplied to the gas supply pipe 28 passes through the heat exchanger 26, moisture contained in the sample gas is condensed on the inner surface of the gas supply pipe 28 and removed. be able to. The temperature sensor 3 (not shown) is separately incorporated in the cooler.
[0004]
In addition, the cooler may gradually deteriorate due to long-term use, resulting in a decrease in the dehumidifying capacity. Especially when the temperature around the cooler (hereinafter referred to as “ambient temperature”) is high, As a result of the large load, the deterioration is accelerated. In some applications, the deterioration is prevented by changing the cooling temperature based on the ambient temperature (see, for example, Patent Document 1).
[0005]
On the other hand, the performance of the analyzer often depends on such dehumidification capacity, that is, cooling capacity, and how to manage the cooling capacity is an important maintenance / inspection item of the apparatus. In particular, in an air pollution analyzer that requires long-term continuous measurement, the cooling capacity often deteriorates due to long-term use, and management is particularly important. Conventionally, the capacity of such a cooler has been managed based only on the output of the temperature sensor or a cooling temperature detection unit provided in a separate cooling unit. Specifically, a method of outputting an alarm of “abnormality of the electronic cooler” when these outputs exceed a set temperature by a certain temperature has been common.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 6-63117 [0007]
[Problems to be solved by the invention]
However, in recent years, various analyzers equipped with coolers are increasingly demanding remote maintenance and self-diagnosis functions, and not only the functions of the entire system but also the diagnostic functions at the individual component level are indispensable. It has become a thing. In particular, in the field-installed analysis apparatus that requires labor saving and labor saving, such a demand is further increased.
[0008]
In addition, alarms that have been performed in the past are usually set to a temperature (alarm temperature) that is higher than the cooling temperature of the cooler, but for failure modes in which the cooler does not operate at all, the ambient temperature is the alarm temperature. As long as the value is not reached, the alarm is not generated. Alternatively, even when the cooler itself generates abnormal heat, if the analyzer is placed outdoors and the ambient temperature in winter is low, the abnormality cannot be detected. Furthermore, even if the temperature setting of the cooler is wrong during maintenance at the site, etc., if the alarm temperature is not reached, it is possible to operate in a state where the original cooling temperature is not reached (no control state). There is sex. In other words, in the conventional management method using the output of the cooling temperature detection unit as described above, even if the cooler is in a failure or abnormal state, it may be operating without being able to recognize the state. The reliability of measured values could be affected.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electronic cooler that contributes to improving the measurement accuracy of an analyzer equipped with a cooler and a diagnostic system thereof, while accurately grasping the operating state of the cooler and facilitating maintenance. There is to do.
[0010]
[Means for Solving the Problems]
As a result of intensive research on the electronic cooler, the present inventors have found that the above object can be achieved by the following cooler, and have completed the present invention.
[0011]
That is, the present invention is an electronic cooler having a cooling temperature detecting means, and has an arithmetic processing means for judging the operating state of the cooler from the cooling temperature and the ambient temperature. With this configuration, it is possible to accurately grasp the operating state of the cooler, including the deteriorated state that was difficult in the past, to facilitate maintenance, and to contribute to improving the measurement accuracy of the analyzer equipped with the cooler. Can be provided.
[0012]
The present invention also relates to an electronic cooler diagnostic system comprising: a cooling temperature detection means; an ambient temperature detection means; and an arithmetic processing means for inputting outputs of both temperature detection means. The processing means determines the operating state of the cooler based on a plurality of settable reference temperatures from the characteristics of the electronic cooler. Electronic cooling that facilitates accurate maintenance management according to the state of the cooler by providing a plurality of management standards that can be set in advance from the characteristics of the electronic cooler as well as accurately grasping the operating state of the cooler with this configuration A diagnostic system for a vessel can be provided.
[0013]
A diagnosis system for the electronic cooler, wherein a determination operation including a step of comparing an ambient temperature with a reference temperature, a step of comparing the cooling temperature with a reference temperature, and a step of comparing the ambient temperature with the cooling temperature is performed. It is characterized by that. By determining the determination process including the ambient temperature, it is possible to provide an electronic cooler diagnosis system that enables an objective determination of the operating state of the cooler.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present invention is an electronic cooler having a cooling temperature detecting means, characterized by comprising arithmetic processing means for judging a deterioration state of the cooler from the cooling temperature and the ambient temperature. The present inventor can grasp the operating state of the cooler more accurately by linking with objective information such as the ambient temperature rather than judging only by the cooling temperature information from the conventional cooler body. The self-diagnosis function can be made more reliable.
[0015]
In general, the deterioration mode of the cooler can be grasped by a concept as shown in FIG. The relationship between the cooling temperature A and the ambient temperature B in a normal state of the cooler is approximately the same value up to the set temperature of the cooler (hereinafter referred to as “set temperature S”, shown as about 15 ° C. in FIG. 1). (OS), when the ambient temperature B exceeds the set temperature S, the cooling temperature A becomes substantially the set temperature S (ST), and the ambient temperature B becomes higher and the capacity limit temperature of the cooler (hereinafter referred to as “limit temperature”). When it exceeds “T” (shown as about 40 ° C. in FIG. 1), the cooling temperature A rises according to the ambient temperature B (TU). On the other hand, in the case where the cooler is in a failed state and the power is not turned on, the cooling temperature A is substantially the same as the ambient temperature B. As the ambient temperature B increases, A will also rise (OSV). The deterioration mode of the cooler can be positioned between the above two states, and is a process in which the cooler that was originally in the former state gradually shifts to the latter state. It can be grasped as the limit temperature T changes. Further, there are two cases in which the cooler has failed and the operation has become abnormal. One is that the cooling temperature A is always higher than the ambient temperature B due to heat generated by the cooler. In another case, the cooling temperature A is always lower than the ambient temperature B due to overcooling of the cooler.
[0016]
That is, when considering the relationship between the above temperatures, the set temperature S can be arbitrarily set, but the limit temperature T varies depending on the set temperature S and the deterioration mode of the cooler, while the limit temperature at the beginning of the cooler manufacture is The relationship between T and the set temperature S can be obtained in advance. Assuming that the deterioration of the cooler progresses and the state of the broken line is assumed, it specifically corresponds to the state of point P and point P ′ in FIG. 1, but the former P is “cooling temperature a: 15 ° C., ambient temperature” “b: 20 ° C.”, the latter P ′ is “cooling temperature a ′: 22 ° C., ambient temperature b ′: 34 ° C.”, and P ′ cannot maintain the set temperature s: 15 ° C. . In this state, t ′ = 27 ° C. can be obtained by calculating the limit temperature by the following equation 1.
t ′ = b ′ − (a′−s) Equation 1
[0017]
That is, since the limit temperature t in the initial state is 40 ° C., it can be seen that the deterioration is advanced by 13 ° C. (40 ° C.-27 ° C.) at the limit temperature level. In the present invention, the current deterioration level can be quantitatively determined by one measure of the limit temperature.
[0018]
As described above, it has been found that from the state in which the cooling temperature A is different from the set temperature S, it is possible to determine the deterioration state of the cooler, which has been difficult in the past. In other words, by obtaining the “limit temperature T” from these three elements “cooling temperature A”, “ambient temperature B”, and “set temperature S”, not only the determination of the normality / failure of the cooler but also the presence or absence of deterioration A progress state can be grasped, and a cooler having a highly accurate self-diagnosis function can be provided. Further, by accumulating information on such deterioration states and tracking changes over time, it is possible to estimate the preparation period and replacement time of the cooler, and it becomes possible to set the maintenance time and the parts preparation time in advance. . In other words, taking the time on the horizontal axis and the limit temperature at the same set temperature on the vertical axis, the relationship curve shown in Fig. 2 is usually obtained, and each time of maintenance, preparation, and replacement can be estimated. It can contribute to maintenance efficiency such as realization and reduction of parts inventory.
[0019]
FIG. 3 is a block diagram showing an example of the present invention. In the inside of the electronic cooler 1, an arithmetic processing means 6 is provided in addition to the above-described components, and outputs from the temperature detecting means 4 and the ambient temperature detecting means 5 of the cooling unit 2 are inputted. The temperature of the cooling unit 2 is controlled based on the output from the separately provided temperature sensor 3 as described above, but it is possible to use the temperature detecting means 4 also as the temperature sensor 3. Here, as the temperature sensor 3 or the temperature detection means 4, for example, various thermocouples, thermistors, resistance temperature detectors and the like are frequently used, but are not limited thereto. For the ambient temperature, it is also possible to use information such as a non-contact radiation thermometer used for other purposes.
[0020]
The present invention also relates to an electronic cooler diagnostic system comprising: a cooling temperature detection means; an ambient temperature detection means; and an arithmetic processing means for inputting outputs of both temperature detection means. The processing means is characterized in that the operating state of the cooler is determined based on a plurality of reference temperatures that can be set from the characteristics of the electronic cooler. In other words, from the knowledge that the deterioration state of the cooler can be estimated from the relationship curve between the cooling temperature and the ambient temperature in the deterioration mode as described above, a plurality of reference temperatures that can be set from the characteristics of the electronic cooler are set in advance. By doing so, a diagnostic system for an electronic cooler that accurately grasps the operating state of the cooler becomes possible.
[0021]
Specifically, the limit temperature in the reference relational curve as shown in FIG. 4 (hereinafter referred to as “reference curve”. For example, in FIG. 4, a curve when the set temperature is assumed to be 0 ° C.) is expressed as the reference temperature. For example, it is possible to arbitrarily set reference temperatures P, Q, and R that require maintenance, preparation, and replacement operations on a reference curve. Thereby, it is possible to grasp the deterioration condition of the cooler itself that does not depend on the use condition of the cooler, that is, the set temperature. In addition, as described above, by setting multiple reference temperatures corresponding to the maintenance, preparation, and replacement work periods, each work instruction can be output from the arithmetic processing unit, enabling highly accurate self-diagnosis. A cooler diagnostic system can be realized.
[0022]
In the above description, the case where the reference temperature is assumed to be 0 ° C. has been described as an example. However, the present invention is not limited to this, and each temperature corresponding to an arbitrary set temperature that matches the use condition of the cooler is described. It is also possible to do. For example, in FIG. 4, when the set temperature is s, the limit temperature is t, the reference temperature associated with each operation is p · q · r, and when the set temperature is s ′, the limit temperature is t ′. Each reference temperature can be set to p ′ · q ′ · r ′.
[0023]
It is also possible to arbitrarily set a plurality of reference temperatures related to the characteristics of the electronic cooler from the condition of the ambient temperature in which the cooler is used. Details will be described later.
[0024]
FIG. 5 shows an example of a cooler diagnostic system. In addition to the arithmetic processing unit 6 that receives and calculates the cooling temperature output from the cooler 1 and the output from the ambient temperature detection means 5, an operation display unit 7 that displays the system operation and the calculation result is provided. Of course, as shown in FIG. 3, the arithmetic processing unit 6 can be incorporated in the cooler 1, and other elements such as separation of the operation display unit 7 can be added or changed. In addition to displaying various maintenance details, the operation state of the cooler, particularly the deterioration state, can be visually recognized by displaying the “operation state of the electronic cooler” shown in FIG. It is possible to improve the efficiency and speed of maintenance work.
[0025]
In addition, the establishment of such management standards facilitates accurate maintenance management according to the condition of the cooler and ensures stable dehumidification capacity, so that the measurement accuracy is maintained and improved in the analyzer equipped with the cooler. Can be achieved. In other words, for example, in a gas analyzer, the amount of moisture in the sample gas changes, causing an error in the partial pressure fluctuation, and the increase in moisture causes corrosion or contamination of the measurement part due to the corrosive component in the sample gas. However, by improving the characteristics of the cooler, the influence on the measurement accuracy can be suppressed, and the analyzer can be stably operated and the accuracy can be maintained.
[0026]
A diagnosis system for the electronic cooler, wherein a determination operation including a step of comparing an ambient temperature with a reference temperature, a step of comparing the cooling temperature with a reference temperature, and a step of comparing the ambient temperature with the cooling temperature is performed. It is characterized by that. By adopting not only the judgment process based on the cooling temperature inside the cooler but also the judgment process including the ambient temperature, it is possible to grasp the normality, failure, and deterioration of the operating cooler, or the progress of the deterioration. This makes it possible to more accurately and objectively determine the operating state of the cooler.
[0027]
Specifically, the algorithm represented by the flow of FIGS. 6A to 6D is illustrated in relation to the operation state of the cooler shown in FIG. The cooler is diagnosed by a process of (1) classification according to ambient temperature, and (2) determining an operation state based on the cooling temperature. At this time, a plurality of reference temperatures related to the characteristics of the electronic cooler are set. That is, a plurality of reference temperatures including the set temperature s (15 ° C. in the example in the figure) and the limit temperature t (40 ° C. in the figure) are set in the arithmetic processing means.
Specifically, in addition to the above two temperatures, the difference g (t−g = 25 ° C.) between the set temperature s and the degradation range lower limit temperature (that is, the limit temperature t) and the allowable temperature range c to be considered in the determination (for example, 5 ° C). Further, when the work determination is further added to the diagnosis mode for the deterioration mode as described above, each reference temperature corresponding to the maintenance / preparation / replacement illustrated in FIG. 4 is set.
[0028]
The diagnostic flow is
(1) As a first step, as shown in FIG. 6A, the ambient temperature is compared with a reference temperature s and a limit temperature t, and the next step is entered corresponding to each region.
The next step is
(2-1) As shown in FIG. 6B, when the ambient temperature is lower than the set temperature s, the cooling temperature is compared with the ambient temperature to determine whether there is an abnormality due to overcooling or heat generation.
(2-2) As shown in FIG. 6C, when the ambient temperature is higher than the set temperature s and lower than the limit temperature t, the cooling temperature is compared with the set temperature s and / or the ambient temperature ( In consideration of the allowable width c), it is determined whether there is any abnormality, failure or deterioration due to overcooling or heat generation.
(2-3) As shown in FIG. 6D, when the ambient temperature exceeds the limit temperature t, the cooling temperature is compared with the set temperature s or / and the ambient temperature (the allowable width c and the difference g are set). Judgment), whether there is an abnormality, failure or deterioration due to overcooling or heat generation.
When it is determined by the above diagnosis flow that there is an abnormality or failure, an alarm is generated, and maintenance and replacement measures are taken.If there is a deterioration, information corresponding to maintenance, preparation and replacement is generated, and maintenance and replacement are performed. Preparation and replacement measures are taken.
[0029]
Next, another embodiment is illustrated in FIG. In a specific diagnosis system, more precise determination is required based on a reference temperature that takes into account the case where the temperature adjustment accuracy (deviation from the set temperature) of the cooler and the deterioration range are arbitrarily set. FIG. 7 is basically the same as FIG. 1, but with this consideration, more reference temperatures related to the characteristics of the electronic cooler can be arbitrarily set based on the conditions of the reference temperature and the ambient temperature in which the cooler is used. There is a feature in the point. That is, the four reference temperatures in the above example are further subdivided or added to them, and the reference temperatures are set in the arithmetic processing means.
[0030]
Here, based on the above four reference temperatures, a method of adding and setting the following c, d, e, f, p ₁ , p ₂ , and p ₃ as reference temperatures may be mentioned.
c: The allowable range of temperature at which it is determined that there is an abnormality due to heat generation compared to the ambient temperature. In the example of FIG.
d: Allowable width of temperature that is judged to be abnormal due to overcooling compared to ambient temperature or set temperature. In the example of FIG.
e: Temperature adjustment accuracy of the cooler (temperature adjustment accuracy). In the example of FIG.
f: Measurement accuracy of temperature that is judged to be a failure with respect to ambient temperature. In the example of FIG.
g: Difference between set temperature s and limit temperature t. In the example of FIG.
t: Limit temperature. In the example of FIG.
p ₁ = s−c + e = 11 (° C.)
p ₂ = s + ef = 17 (° C.)
p ₃ = t−c + e = 36 (° C.)
[0031]
FIG. 8 shows an example of a basic diagnosis flow in the example of FIG.
(1) FIG. 8A shows a first step of comparing the ambient temperature with the reference temperature (s, p _{1 to} p ₃ ). Divide into four criteria according to the ambient temperature and proceed to the next step.
(2-1) As shown in FIG. 8 (B), when the ambient temperature is lower than the reference temperature p ₁ (reference temperature in consideration of the set temperature s, the allowable width c, and the temperature adjustment accuracy e), the cooling temperature and the ambient temperature By the step of comparing the temperatures, it is possible to mainly determine the presence or absence of overheating or overcooling below the set temperature. The determination takes into account the temperatures c (+ 5 ° C.) and d (−5 ° C.) that allow for variations and errors in the detection means.
(2-2) As shown in FIG. 8C, when the ambient temperature is not less than p _{1 and} less than s (15 ° C.), the cooling temperature is compared with the reference temperature (set temperature s) and / or the ambient temperature ( In consideration of the allowable width c and the temperature control accuracy e), it is determined whether there is an abnormality or failure due to overcooling or heat generation.
(2-3) As shown in FIG. 8D, when the ambient temperature is not less than s and less than p ₂ (17 ° C., set temperature s, temperature adjustment accuracy e, and reference temperature considering ambient temperature accuracy f). Then, the cooling temperature is compared with the set temperature s and / or the ambient temperature (considering the allowable width c and the temperature adjustment accuracy e), and it is determined whether there is an abnormality or failure due to overcooling or heat generation.
(2-4) As shown in FIG. 8E, in the case where the ambient temperature is not less than p _{2 and} less than p ₃ (36 ° C., the limit temperature t, the allowable width c, and the reference temperature in consideration of the temperature adjustment accuracy e), The cooling temperature is compared with the set temperature or / and the ambient temperature (considering the allowable width c and the temperature adjustment accuracy e), and the presence / absence of abnormality, failure, and deterioration is determined.
(2-5) As shown in FIG. 8F, when the ambient temperature is p ₃ or more, the cooling temperature is compared with the set temperature or / and the ambient temperature (considering the allowable width c and the temperature adjustment accuracy e). ), Determine whether there is an abnormality or failure due to overcooling or heat generation.
When it is determined by the above diagnosis flow that there is an abnormality or failure, an alarm is generated, and maintenance and replacement measures are taken.If there is a deterioration, information corresponding to maintenance, preparation and replacement is generated, and maintenance and replacement are performed. Preparation and replacement measures are taken.
[0032]
As another method, instead of the difference g among the four reference temperatures (the set temperature s, the limit temperature t, the difference g between both, and the allowable temperature range c) in the above example, the representative value of the ambient temperature and the limit temperature There is a method in which the difference h from t is set as one of the reference temperatures, and based on this, p ₃ ′ is added and set as the reference temperature instead of p ₃ described above. Here, the representative value of the ambient temperature refers to a value representative of the ambient temperature in a state where the cooler is actually installed. For example, an average ambient temperature can be set.
h: Difference between the representative value of the ambient temperature and the limit temperature t. In the example of FIG. 7, the average value is 20 ° C. and 20 ° C. is set. P ₃ ′ = s + e + h = 36 (° C.)
At this time, the p ₃ in a diagnostic flow p _{3 ',} except replacing the 25 ° C. to 20 ° C., it is possible to perform abnormality determination by the same method as described above, based on the ambient temperature of the installed the cooler By determining, management reflecting actual operating conditions can be performed. At this time, it is preferable to change the representative value in accordance with changes in the season, ambient conditions of installation, and the like. Management that considers more operating conditions becomes possible.
[0033]
As described above, since the diagnosis of the cooler plays an important role in the analyzer, it is preferable to set an arbitrary reference temperature corresponding to the use condition of the cooler.
However, it goes without saying that such a cooler, its diagnostic system, and diagnostic method are not limited to the analyzer.
[0034]
【The invention's effect】
As described above, the present invention has an arithmetic processing means for judging the operating state of the cooler not only from the cooling temperature but also from the ambient temperature. Thus, it is possible to provide an electronic cooler that facilitates maintenance, and contributes to improvement in measurement accuracy of an analyzer equipped with a cooler.
[0035]
Further, the present invention accurately grasps the operating state of the cooler by the electronic cooler diagnostic system that determines the operating state of the cooler based on a plurality of reference temperatures that can be set from the characteristics of the cooler, By providing a plurality of management standards that can be set in advance from the characteristics of the electronic cooler, it is possible to provide an electronic cooler diagnostic system that facilitates accurate maintenance management according to the state of the cooler.
[0036]
Further, by determining a judgment process including the ambient temperature, including comparing the ambient temperature to the reference temperature, comparing the cooling temperature to the reference temperature, and comparing the ambient temperature to the cooling temperature. In addition, it is possible to provide a diagnostic system for an electronic cooler that enables an objective determination of the operating state of the cooler.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating an example of an operating state of an electronic cooler according to the present invention. FIG. 2 is an explanatory diagram illustrating an example of a change over time of the operating state of the electronic cooler according to the present invention. FIG. 4 is an explanatory diagram showing an example of the configuration of the electronic cooler according to the invention. FIG. 4 is an explanatory diagram showing an example of the operating state and temperature setting of the diagnostic system for the electronic cooler according to the invention. FIG. 6 is an explanatory diagram showing an example of the diagnosis system of the electronic cooler according to the present invention. FIG. 7 is an explanatory diagram showing an example of the diagnosis flow in the diagnostic system for the electronic cooler according to the present invention. FIG. 8 is an explanatory diagram showing another embodiment of a diagnosis flow in the diagnostic system for an electronic cooler according to the present invention. FIG. 9 is an explanatory diagram showing a configuration example of a conventional electronic cooler. Description】
A Cooling temperature B Ambient temperature S Set temperature T Limit temperature 1 Electronic cooler 2 Cooling unit 3 Temperature sensor 4 Temperature detection unit 5 Ambient temperature detection unit 6 Arithmetic processing unit 7 Operation display unit

Claims (3)

An electronic cooler having a cooling temperature detecting means, comprising: an arithmetic processing means for judging an operating state of the cooler from the cooling temperature and a temperature around the cooler (ambient temperature). . In an electronic cooler having a cooling temperature detecting means, an ambient temperature detecting means, and an arithmetic processing means for inputting outputs of both temperature detecting means, a plurality of reference temperatures that can be set from the characteristics of the electronic cooler. A system for diagnosing an electronic cooler characterized in that an operating state of the cooler is determined based on the above. A diagnosis system for an electronic cooler that performs a judgment operation including a step of comparing an ambient temperature with a reference temperature, a step of comparing a cooling temperature with a reference temperature, and a step of comparing the ambient temperature with a cooling temperature The diagnostic system of the electronic cooler of Claim 2 characterized by these.

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