JP2013224890A - Deposit detection sensor head and deposit detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deposit detection sensor head with high heat generation efficiency and thermal responsiveness at a low cost.SOLUTION: The sensor head includes: a resistance temperature detector 55; and a metal case 511 that covers the resistance temperature detector 55, with the inside closely fitted to the surface of the resistance temperature detector 55, and the outside of which becomes a detection surface of a deposit. Preferably, the sensor head according to the present invention may include first to third reinforcing members 512-514 provided inside the metal case 511 along a lead wire 551 led out from the resistance temperature detector 55. Preferably, the sensor head according to the present invention may include a filler filling between a lead wire 551 led out from the resistance temperature detector 55 and the first to third reinforcing members 512-514.

Description

  The present invention relates to a deposit detection device for detecting deposits such as scale and slime in an industrial water system such as a cooling water system, and a sensor head for detection of deposits used in the deposit detection device.

  For example, in a circulating cooling water system, when the concentration of the cooling water increases due to the circulation use of the cooling water, scales such as calcium carbonate and silica contained in the water may adhere to the heat exchanger or the like. In addition, slime generated by the action of organic components in the cooling water system and microorganisms may adhere to the heat exchanger or the like of the circulating cooling water system. It is known that when scale or slime adheres to a heat exchanger or the like of a circulating cooling water system, a failure such as a decrease in heat exchange rate is caused. For this reason, in a cooling water system such as a circulating cooling water system, deposits such as scales and slime (hereinafter simply referred to as “deposits”) are detected at an early stage, and obstructions caused by the deposits are detected. Need to be prevented.

  Conventional techniques for detecting deposits in industrial water systems such as cooling water systems include, for example, a resistance temperature detector provided in contact with the water to be tested, an energization means capable of energizing the resistance temperature detector, A deposit detection apparatus including a control unit that controls the amount is known (see, for example, Patent Document 1). In addition, as an example of a sensor head for detecting an adhering substance used in an adhering substance detecting device, a heating element and a temperature measuring element are inserted into a metal tube, and a filler is provided between the heating element and the temperature measuring element and the inner surface of the metal tube. Is known (see, for example, Patent Document 2).

JP-A-11-153557 JP 2010-101840 A

  When detecting a deposit with a sensor head for detecting a deposit using a resistance temperature detector, the sensor head for detecting the deposit is placed in the test water with the sensor head for detecting the deposit. It is necessary to maintain the temperature at a predetermined temperature. In particular, when detecting the adhesion of the scale, the temperature of the detection surface of the adhesion detection sensor head is set to about 90 to 100 degrees in order to facilitate the adhesion of the scale to the detection surface of the adhesion detection sensor head. Need to be raised. In order to make the temperature distribution on the detection surface of the adhering matter detection sensor head uniform, it is preferable to dispose a heating element on the shaft core portion of the metal tube as in the probe disclosed in Patent Document 2 described above. .

  However, since the conventional adhering matter detection sensor head disclosed in Patent Document 2 is filled with a filler between the metal tube and the heating element, the detection surface (the outer periphery of the metal tube) is formed from the heating element. The temperature gradient is large. Therefore, for example, even if it is attempted to estimate the temperature of the detection surface of the adhesion detection sensor head from the current or voltage of the heating element, there is a possibility that it cannot be accurately estimated. For this reason, in conventional sensor heads for detecting an adhering matter, for example, as disclosed in Patent Document 2 described above, a temperature measuring body is often provided separately at a portion in contact with the inner peripheral surface of the metal tube.

  However, the resistance temperature detector can function as both a heating element and a resistance temperature detector in the first place. Therefore, the sensor head for detecting an adhering substance does not need to provide a heating element and a temperature measuring element separately as in the probe disclosed in Patent Document 2 described above. It is possible to configure. That is, it can be said that the probe disclosed in Patent Document 2 described above has a large number of parts and is problematic in terms of cost. Further, as described above, the probe disclosed in Patent Document 2 has a large temperature gradient from the heating element to the detection surface due to the filler filled between the metal tube and the heating element. There is also a problem that responsiveness is not good.

  The present invention has been made in view of such circumstances, and an object of the present invention is to realize an adhering matter detection sensor head having good heat generation efficiency and thermal response at low cost.

<First Aspect of the Present Invention>
A first aspect of the present invention includes a resistance temperature detector, and a metal case that covers the resistance temperature detector in a state in which the inside is in close contact with the surface of the resistance temperature detector, and the outside is a detection surface. This is a kimono detection sensor head.
The RTD has the inside of the metal case in close contact with the surface. That is, the surface of the resistance temperature detector and the inner side of the metal case are in direct contact with each other without any intervening objects. And the outer side of the metal case serves as a detection surface for deposits. Therefore, there is almost no temperature gradient between the detection surface of the adhering matter detection sensor head and the resistance temperature detector. As a result, when the resistance temperature detector functions as a heating element or when it functions as a temperature measuring element, the heating efficiency and thermal response of the detection surface of the sensor head for detecting an adhering matter are significantly improved compared to the conventional case. Can do. In addition, the sensor head for adhering matter detection according to the first aspect of the present invention can cause the resistance temperature detector to function well as a heating element and a resistance temperature detector, and therefore can be manufactured at a lower cost than in the past. .

Thereby, according to the 1st aspect of this invention, the effect that the sensor head for a deposit | attachment detection with favorable heat_generation | fever efficiency and thermal responsiveness can be implement | achieved at low cost is acquired.
<Second Aspect of the Present Invention>
According to a second aspect of the present invention, there is provided the adhering matter detection sensor head according to the first aspect of the present invention, further comprising a reinforcing frame body provided along the periphery of the metal case. is there.

  The sensor head for detecting an adhering matter according to the present invention does not exist between the surface of the resistance temperature detector and the inside of the metal case, and the inside of the metal case is in direct contact with the surface of the resistance temperature detector. Therefore, depending on the shape or the like of the resistance temperature detector, there is a possibility that the strength may be lower than that of the related art. Therefore, the sensor head for adhering matter detection according to the present invention is such that when an external force is applied due to the flow pressure of the test water or the contact of some foreign matter, the metal case is deformed and the electric wire drawn from the resistance temperature detector is There is a risk of disconnection or short circuit inside the metal case.

According to the second aspect of the present invention, the reinforcement frame provided along the periphery of the metal case reduces the possibility that the metal case will be deformed when the test water flow pressure or some external force is applied. can do. As a result, it is possible to reduce the possibility that the electric wire drawn from the resistance temperature detector will be disconnected or short-circuited inside the metal case.
<Third Aspect of the Present Invention>
According to a third aspect of the present invention, in the first aspect or the second aspect of the present invention described above, a reinforcing member provided in the metal case along the electric wire drawn from the resistance temperature detector is provided. And a deposit detection sensor head.

  According to the third aspect of the present invention, when the flow pressure of the test water or some external force is applied by the reinforcing member provided in the metal case along the electric wire drawn from the resistance temperature detector, the metal The possibility that the case is deformed can be reduced. As a result, it is possible to reduce the possibility that the electric wire drawn from the resistance temperature detector will be disconnected or short-circuited inside the metal case.

<Fourth aspect of the present invention>
A fourth aspect of the present invention is the above-described third aspect of the present invention, further comprising a filler filled between the electric wire drawn from the resistance temperature detector and the reinforcing member. This is a sensor head for detecting a deposit.
According to such a feature, it is possible to reduce the possibility of the test water entering the inside through the gap between the electric wire drawn from the resistance temperature detector and the reinforcing member. Further, since the airtightness inside the metal case is further increased, the heat generation efficiency can be further improved.

<Fifth aspect of the present invention>
According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention described above, the metal case is bonded to the periphery of two metal foils sandwiching the resistance temperature detector. This is a sensor head for detecting an adhering matter, characterized in that it is formed.
According to such a feature, since the metal case is formed of the metal foil that is a thin metal plate, the heat generation efficiency and the heat responsiveness can be further improved.

<Sixth aspect of the present invention>
According to a sixth aspect of the present invention, in any one of the first to fourth aspects of the present invention described above, the metal case has a metal tube into which the resistance temperature detector is inserted, the inner side of the resistance temperature detector. It is formed by making it deform | transform so that it may closely_contact | adhere to the surface of this thing, It is a sensor head for a deposit | attachment detection characterized by the above-mentioned.

  According to the sixth aspect of the present invention, by deforming the metal tube according to the outer shape of the resistance temperature detector, a metal case whose inside is in close contact with the surface of the resistance temperature detector can be easily formed. Therefore, the sensor head for adhering matter detection according to the present invention can be realized at a lower cost. Further, according to the sixth aspect of the present invention, it is possible to flexibly cope with resistance bulbs of various outer shapes, so that it is possible to improve the degree of freedom in designing the sensor head for detecting an attached object according to the present invention. it can.

<Seventh aspect of the present invention>
According to a seventh aspect of the present invention, in any one of the first to sixth aspects of the present invention described above, the metal case is formed of the same material as that of the object to be detected. It is a sensor head for adhering matter detection.
According to such a feature, it is possible to more accurately simulate a target for detecting an attached matter, and thus it is possible to further improve the accuracy of detecting the attached matter.

<Eighth aspect of the present invention>
According to an eighth aspect of the present invention, there is provided the adhering matter detection sensor head according to any one of the first to seventh aspects of the present invention described above, and a liquid flow path through which a liquid to be measured by the adhering matter detection sensor head flows. The current of the resistance temperature detector is controlled so that the temperature of the detection surface of the attached matter detection sensor head becomes a predetermined temperature, and the attachment of the detected surface of the attached matter detection sensor head from the magnitude of the current. And a sensor device for detecting the adhered matter.

  According to the eighth aspect of the present invention, in the adhering matter detection apparatus, it is possible to obtain the operational effects of any of the first to seventh aspects of the present invention described above.

  ADVANTAGE OF THE INVENTION According to this invention, the sensor head for a deposit | attachment detection with favorable heat_generation | fever efficiency and thermal responsiveness is realizable at low cost.

The system diagram which illustrated the structure of the circulation type cooling water system. The block diagram which illustrated the structure of the measurement part of a deposit | attachment detection apparatus. The top view of the sensor head of 1st Example. It is sectional drawing of the sensor head of 1st Example, and sectional drawing which illustrated the II cross section of FIG. The side view seen from the detection part side of the sensor head of 1st Example. The top view of the detection part of 1st Example. It is sectional drawing of the detection part of 1st Example, and sectional drawing which illustrated the II-II cross section of FIG. It is sectional drawing of the detection part of 1st Example, and sectional drawing which illustrated the III-III cross section of FIG. The top view which illustrated the internal structure of the detection part of 1st Example. It is sectional drawing of the detection part of 2nd Example, and sectional drawing which illustrated the II-II cross section of FIG. It is sectional drawing of the detection part of 2nd Example, and sectional drawing which illustrated the III-III cross section of FIG. The top view of the detection part of 3rd Example. It is sectional drawing of the detection part of 3rd Example, and sectional drawing which illustrated the IV-IV cross section of FIG. It is sectional drawing of the detection part of 3rd Example, and sectional drawing which illustrated the VV cross section of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, this invention is not specifically limited to the Example demonstrated below, It cannot be overemphasized that a various deformation | transformation is possible within the range of the invention described in the claim.
<Configuration of cooling water system>
The configuration of the circulating cooling water system will be described with reference to FIGS. 1 and 2.

FIG. 1 is a system diagram illustrating the configuration of a circulating cooling water system. FIG. 2 is a block diagram illustrating the configuration of the measurement unit 31 of the attached matter detection device 30.
The circulating cooling water system includes a cooling tower 10, a concentration management device 20, a deposit detection device 30, and a communication device 40.
The cooling tower 10 directly brings ambient air and cooling water into contact with each other to evaporate a part of the cooling water by using the enthalpy difference between the air and the cooling water, and cools the cooling water with latent heat of evaporation taken from the cooling water. It is a device to do. The cooling tower 10 includes a circulation pump 11, a heat exchanger 12, a water spray plate 13, a blower 14, an electric conductivity meter 15, a replenishing valve 16, a blow valve 17 and a submersible pump 18.

  The circulation pump 11 is a pump that sends the cooling water of the cooling tower 10 to the watering plate 13 through the circulation flow path 111. The heat exchanger 12 is a heat exchange device that is provided in the circulation channel 111 and uses cooling water in the circulation channel 111 as a cooling medium. The water spray plate 13 is a device that sprays the cooling water whose temperature has been increased by the heat exchanger 12 into the cooling tower 10. The blower 14 is provided at the exhaust port 112 at the top of the cooling tower 10, and is a device that introduces air from the louver 113 and discharges it to the exhaust port 112. The cooling water whose temperature has increased in the heat exchanger 12 is sprayed from the water spray plate 13 and is cooled in contact with the air introduced from the louver 113 at that time.

  The electric conductivity meter 15 is a measuring instrument that measures the electric conductivity of the cooling water in the cooling tower 10. The electrical conductivity of the cooling water measured by the electrical conductivity meter 15 is output to the concentration management device 20. The replenishment valve 16 is an open / close valve provided in a replenishment flow path 114 that is a flow path for supplying replenishment water to the cooling tower 10, and is controlled by the concentration management device 20. The blow valve 17 is an open / close valve provided in a blow flow path 115 that is a flow path for blowing cooling water from the cooling tower 10, and is controlled by the concentration management device 20. The concentration management device 20 controls the replenishment valve 16 and the blow valve 17 so that the electric conductivity of the cooling water in the cooling tower 10 falls within a certain range. The submersible pump 18 is provided in the cooling water of the cooling tower 10, and is a pump that sends the cooling water to the measuring unit 31 of the deposit detection device 30 through the delivery flow path 116. The cooling water sent to the measurement unit 31 is returned to the cooling tower 10 through the return channel 117.

The attached matter detection device 30 as the “sensor device” includes a measurement unit 31, a determination unit 32, and a display unit 33.
The measurement unit 31 includes a flow cell 311, a current generation device 312, a voltage detection device 313, a temperature control device 314, and a sensor head 50. The flow cell 311 as the “liquid channel” is supplied with cooling water from the cooling tower 10 through the delivery channel 116. The cooling water sent to the flow cell 311 is returned to the cooling tower 10 through the return flow path 117. The sensor head 50 as the “attachment detection sensor head” is provided at a position where the detection surface is in contact with the cooling water flowing through the flow cell 311 and the attachment can be detected. The current generator 312 is a device that generates a current to be supplied to the sensor head 50, and includes, for example, a known constant current power source (not shown) and a current control circuit (not shown). The voltage detection device 313 is a device that detects the voltage of the sensor head 50. The temperature control device 314 is a known microcomputer control device, and is a device that feedback-controls the current generation device 312 based on the output signal of the voltage detection device 313. More specifically, the temperature control device 314 calculates the temperature of the detection surface of the sensor head 50 from the voltage of the sensor head 50 and calculates the sensor head 50 so that the temperature of the detection surface of the sensor head 50 becomes a predetermined temperature. To control the current. Further, the temperature control device 314 outputs the current control value to the determination unit 32.

  The determination unit 32 is a known microcomputer control device, and is a device that detects an adhering matter adhering to the detection surface of the sensor head 50 from the magnitude of the current control value output from the temperature control device 314 of the measurement unit 31. More specifically, the determination unit 32 determines whether the current control value output from the temperature control device 314 of the measurement unit 31 exceeds a preset threshold value, and the current control value exceeds the threshold value. The alarm signal is output to the display unit 33 and the communication device 40. The display unit 33 includes a display device such as a liquid crystal display, and is a device that displays an alarm signal output from the determination unit 32. The communication device 40 is a device that transmits an alarm signal output from the determination unit 32 to a server or an administrator's terminal device or the like through a wired or wireless communication line.

<First Example of Sensor Head>
The configuration of the sensor head 50 of the first embodiment will be described with reference to FIGS.
FIG. 3 is a plan view of the sensor head 50 of the first embodiment. FIG. 4 is a cross-sectional view of the sensor head 50 of the first embodiment, and illustrates the II cross section of FIG. FIG. 5 is a side view of the sensor head 50 of the first embodiment, and is a side view of the sensor head 50 viewed from the detection unit 51 side.

  The sensor head 50 of the first embodiment includes a detection unit 51 and a cable connection unit 52. Two lead wires 551 (electric wires) are drawn from the detection unit 51. The configuration of the detection unit 51 will be described later. The cable connection portion 52 is a cylindrical metal tube. A part of the detection unit 51 and a part of the cable 54 are inserted inside the cable connection unit 52. The two lead wires 551 led out from the detection unit 51 are connected to the two electric wires 541 of the cable 54 inside the cable connection unit 52, respectively. In addition, a resin material 53 is filled inside the cable connection portion 52.

FIG. 6 is a plan view of the detection unit 51 of the first embodiment. FIG. 7 is a cross-sectional view of the detection unit 51 of the first embodiment, and illustrates the II-II cross section of FIG. FIG. 8 is a cross-sectional view of the detection unit 51 of the first embodiment, and illustrates the III-III cross section of FIG. FIG. 9 is a plan view illustrating the internal structure of the detection unit 51 of the first embodiment.
The detection unit 51 of the sensor head 50 of the first embodiment includes a resistance temperature detector 55, a filler 56, a metal case 511, a first reinforcing member 512, a second reinforcing member 513, and a third reinforcing member 514.

The resistance temperature detector 55 is, for example, a platinum resistance temperature detector. The two lead wires 551 are drawn from the resistance temperature detector 55 and are connected to platinum inside the resistance temperature detector 55.
The metal case 511 is a member that covers the resistance temperature detector 55 in a state in which the inner side is in close contact with the surface of the resistance temperature detector 55 and the outer side is a detection surface. More specifically, the metal case 511 is formed by bonding the peripheral edges of the two metal foils 51a and 51b with the temperature measuring resistor 55 sandwiched therebetween. As a material of the metal case 511 (two metal foils 51a and 51b), for example, a metal having good thermal conductivity such as copper, iron, SUS (Steel Use Stainless) is preferable. Furthermore, it is more preferable that the metal case 511 is formed of the same material as that of the heat exchanger 12. As a result, the generation condition of the deposit on the metal case 511 is almost the same as that of the heat exchanger 12, and therefore the heat exchanger 12 can be simulated more accurately, so that the deposit can be detected with higher accuracy. Moreover, the adhesion of the peripheral edges of the two metal foils 51a and 51b can be performed by, for example, pressure bonding, fusion bonding, or resin adhesive.

  The first reinforcing member 512, the second reinforcing member 513, and the third reinforcing member 514 as “reinforcing members” are provided along the two lead wires 551 drawn from the resistance temperature detector 55. More specifically, the first reinforcing member 512 is provided outside the one lead wire 551. The second reinforcing member 513 is provided outside the other lead wire 551. The third reinforcing member 514 is provided between the two lead wires 551.

  The filling material 56 is filled between the two lead wires 551 drawn from the resistance temperature detector 55 and the first to third reinforcing members 512 to 514. The filler 56 is also filled in a gap between the resistance temperature detector 55 and the first to third reinforcing members 512 to 514. On the other hand, the filler 56 is not filled between the two metal foils 51 a and 51 b and the surface of the resistance temperature detector 55. The filler 56 is, for example, a resin or the like, and from the viewpoint of further improving the heat generation efficiency of the sensor head 50, it is preferable to use a material having low thermal conductivity.

  In the sensor head 50 having such a configuration, the inside of the metal case 511 is in close contact with the surface of the resistance temperature detector 55. That is, the surface of the resistance temperature detector 55 and the inner side of the metal case 511 are in direct contact with each other, with no intervening objects therebetween. And the outer side of the metal case 511 becomes a detection surface of the deposit. Therefore, there is almost no temperature gradient between the detection surface of the sensor head 50 and the resistance temperature detector 55. As a result, when the resistance temperature detector 55 functions as a heating element or when it functions as a temperature measuring element, the heating efficiency and thermal responsiveness of the detection surface of the sensor head 50 can be greatly improved compared to the conventional case. . The sensor head 50 according to the present invention can be manufactured at a lower cost than the prior art because the temperature measuring resistor 55 can function well as a heating element and a temperature measuring element.

Thus, according to the present invention, the sensor head 50 having good heat generation efficiency and thermal response can be realized at low cost.
In addition, the sensor head 50 according to the present invention includes the first to third members in the metal case 511 along the two lead wires 551 drawn from the resistance temperature detector 55 as in the first embodiment described above. Reinforcing members 512 to 514 are preferably provided. This is not an essential component of the present invention, but by adopting such a configuration, the metal case 511 is deformed when the flow pressure of cooling water flowing through the flow cell 311 or some external force is applied to the detection unit 51. It is possible to reduce the risk of being lost. As a result, it is possible to reduce the possibility that the two lead wires 551 drawn from the resistance temperature detector 55 are disconnected or short-circuited inside the metal case 511.

  Further, the sensor head 50 according to the present invention includes two lead wires 551 and first to third reinforcing members 512 to 514 drawn from the resistance temperature detector 55 as in the first embodiment described above. Filling material 56 is preferably filled in between. This is not an essential component of the present invention, but with such a configuration, the two lead wires 551 drawn from the resistance temperature detector 55 and the first to third reinforcing members 512 to 514 It is possible to reduce the possibility that the cooling water enters the inside through the gap between the two. Moreover, since the airtightness inside the metal case 511 becomes higher, the heat generation efficiency of the detection unit 51 can be further improved.

  Further, the sensor head 50 according to the present invention attaches the metal case 511 by bonding the peripheral edges of the two metal foils 51a and 51b with the resistance temperature detector 55 sandwiched therebetween as in the first embodiment described above. Preferably formed. Although this is not an essential component of the present invention, the heat generation efficiency and thermal responsiveness of the detection unit 51 can be further improved by forming the metal case 511 with a metal foil that is a thin metal plate.

<Second Embodiment of Sensor Head>
The configuration of the sensor head 50 of the second embodiment will be described with reference to FIGS.
FIG. 10 is a cross-sectional view of the detection unit 51 of the second embodiment, and illustrates the II-II cross section of FIG. FIG. 11 is a cross-sectional view of the detection unit 51 of the second embodiment, and illustrates the III-III cross section of FIG.

The sensor head 50 of the second embodiment is different from the first embodiment in the configuration of the metal case 511 of the detection unit 51. Since the other components are the same as those in the first embodiment, the same reference numerals are given and detailed descriptions thereof are omitted.
The metal case 511 of the detection unit 51 of the second embodiment is formed by deforming the metal tube into which the resistance temperature detector 55 is inserted so that the inside thereof is in close contact with the surface of the resistance temperature detector 55. By deforming the metal tube in accordance with the outer shape of the resistance temperature detector 55, the metal case 511 whose inside is in close contact with the surface of the resistance temperature detector 55 can be easily formed. Therefore, the sensor head according to the present invention. 50 can be realized at a lower cost. Moreover, since it can respond | correspond flexibly to the temperature measuring resistor 55 of various external shapes, the design freedom of the sensor head 50 which concerns on this invention can be improved.

<Third embodiment of sensor head>
The configuration of the sensor head 50 according to the third embodiment will be described with reference to FIGS.
FIG. 12 is a plan view of the detection unit 51 of the third embodiment. FIG. 13 is a cross-sectional view of the detection unit 51 of the third embodiment, and illustrates the IV-IV cross section of FIG. FIG. 14 is a cross-sectional view of the detection unit 51 of the third embodiment, and illustrates the VV cross section of FIG.

The sensor head 50 of the third embodiment is different from the first embodiment in that a reinforcing frame 515 is further provided on the detection unit 51. Since the other components are the same as those in the first embodiment, the same reference numerals are given and detailed descriptions thereof are omitted.
In the detection unit 51 of the third embodiment, a reinforcing frame body 515 is provided along the periphery of the metal case 511. More specifically, the reinforcing frame 515 is a substantially U-shaped member as illustrated. In the detection unit 51 of the third embodiment, the metal case 511 is formed by bonding the peripheral edges of the two metal foils 51 a and 51 b to the reinforcing frame 515. In the gaps between the reinforcing frame body 515 and the resistance temperature detector 55, between the reinforcing frame body 515 and the first reinforcing member 512, and between the reinforcing frame body 515 and the second reinforcing member 513, the filler 56 is provided. Is filled.

  Thus, by providing the reinforcing frame body 515 along the periphery of the metal case 511, the strength of the metal case 511 can be increased. Therefore, the possibility that the metal case 511 is deformed when the flow pressure of cooling water flowing through the flow cell 311 or some external force acts on the detection unit 51 can be reduced. Accordingly, the sensor head 50 according to the third embodiment can reduce the possibility that the two lead wires 551 drawn from the resistance temperature detector 55 are disconnected or short-circuited inside the metal case 511.

DESCRIPTION OF SYMBOLS 10 Cooling tower 30 Adhering matter detection apparatus 50 Sensor head 51 Detection part 51a, 51b Metal foil 55 Resistance temperature detector 56 Filler 511 Metal case 512 1st reinforcement member 513 2nd reinforcement member 514 3rd reinforcement member 515 Reinforcement frame

Claims (8)

A resistance temperature detector,
An attached matter detection sensor head comprising: a metal case that covers the resistance temperature detector in a state in which the inside is in close contact with the surface of the resistance temperature detector and the outside is a detection surface of the attached matter.   The sensor head for detecting an adhering matter according to claim 1, further comprising a reinforcing frame provided along a peripheral edge of the metal case.   The sensor head for adhering matter detection according to claim 1 or 2, further comprising a reinforcing member provided in the metal case along an electric wire drawn from the resistance temperature detector. Sensor head for kimono detection.   The sensor head for adhering matter detection according to claim 3, further comprising a filler filled between the electric wire drawn out from the resistance temperature detector and the reinforcing member. Sensor head.   5. The attached matter detection sensor head according to claim 1, wherein the metal case is formed by adhering peripheral edges of two metal foils sandwiching the resistance temperature detector. A sensor head for detecting an adhering matter.   5. The sensor head for adhering matter detection according to claim 1, wherein the metal case has a metal tube into which the resistance temperature detector is inserted so that an inner side of the metal case is in close contact with the surface of the resistance temperature detector. A sensor head for adhering matter detection, characterized by being formed by deforming.   The sensor head for detecting an adhering matter according to any one of claims 1 to 6, wherein the metal case is formed of the same material as an object for detecting the adhering matter. The sensor head for adhering matter detection according to any one of claims 1 to 7,
A liquid flow path through which a liquid to be measured by the attached matter detection sensor head flows;
The current of the resistance temperature detector is controlled so that the temperature of the detection surface of the adhering matter detection sensor head becomes a predetermined temperature, and the adhering matter detection sensor head adheres to the detection surface of the adhering matter detection sensor head from the magnitude of the current. And a sensor device for detecting a deposit.

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