Arrangement for monitoring a plate heat exchanger

Abstract

The present disclosure relates to an arrangement for monitoring a plate heat exchanger (100). The arrangement comprises at least one slave monitoring device (123) comprising at least one sensor (150) arranged in a port opening (104) in an end plate (110, 111) of the heat exchanger (100) where fluid enters or exits the heat exchanger, the sensor (150) being arranged to measure a property of said fluid, the at least one slave monitoring device (123) further comprising a communication module (130) configured to acquire a data set indicating the measured property of the fluid from the at least one sensor (150) of the slave monitoring device (123) for communicating said data to a master monitoring device (120) comprised in the arrangement. The arrangement further comprises the master monitoring device (120) comprising at least one sensor (160) arranged in another port opening (101) in the end plate (no, 111) of the heat exchanger (100) where fluid enters or exits the heat exchanger (100), the sensor being arranged to measure a property of said fluid, the at least one master monitoring device (120) further comprising a communication module (131) configured to acquire a data set indicating the measured property of the fluid from the at least one sensor (160) of the master monitoring device (120), and the data indicating the measured property of the fluid from the at least one sensor (150) of the slave monitoring device (123), for communicating the data sets to a remote location (140).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an arrangement for monitoring a plate heat exchanger.BACKGROUND

[0002] In a state-of-the-art heat exchanger, such as for instance a gasketed plate heat exchanger (GPHE), it is desirable to monitor operational parameters in the form of e.g. temperature and pressure to determine performance of the heat exchanger.

[0003] However, setting up a sensor structure to monitor the operational parameters and communicating data representing the monitored operational parameters as collected by the sensors is a laborious and tedious task, in particular in an environment as demanding for the sensors as that associated with a heat exchanger.

[0004] There is thus room for improvement in setting up a sensor structure to monitor the operational parameters of a heat exchanger.SUMMARY

[0005] One objective is to solve, or at least mitigate, this problem in the art and thus to provide an improved arrangement for monitoring a plate heat exchange.

[0006] This objective is attained in an aspect by an arrangement configured to monitor a plate heat exchanger. The arrangement comprises at least one slave monitoring device comprising at least one sensor arranged in a port opening in an end plate of the heat exchanger where fluid enters or exits the heat exchanger, the sensor being arranged to measure a property of said fluid, the at least one slave monitoring device further comprising a communication module configured to acquire a data set indicating the measured property of the fluid from the at least one sensor of the slave monitoring device for communicating said data to a master monitoring device comprised in the arrangement. The arrangement further comprises the master monitoring device comprising at least one sensor arranged in another port opening in the end plate of the heat exchanger where fluid enters or exits the heat exchanger, the sensor being arranged to measure a property of said fluid, the at least one master monitoring device further comprising a communication module configured to acquire a data set indicating the measured property of the fluid from the at least one sensor of the master monitoring device, and the data indicating the measured property of the fluid from the at least one sensor of the slave monitoring device, for communicating the data sets to a remote location.

[0007] An advantage of utilizing the master-slave arrangement of this aspect is that while the master monitoring device may be required to be capable of long-range communication, such as over hundreds and even thousands of kilometres, thereby likely requiring a Subscriber Identity Module (SIM) card for enabling the communication, the slave monitoring device are only required to be capable of short range communication, such as WiFi, Bluetooth, near-field communication (NFC).

[0008] Further advantageous is that the communication modules are placed at an end plate (i.e. front plate or back plate) rather than at intermediate plates between the front plate and the back plate of the heat exchanger. Firstly, this is far less challenging environment in terms of e.g. temperature and humidity. Secondly, the communication modules can be easily reached by maintenance personnel if required, since the communication modules are arranged at the front / back plate, which is also true for the sensors should the sensors require maintenance.

[0009] In an embodiment the at least one sensor of said at least one slave monitoring device and / or the at least one sensor of the master monitoring device is arranged on an inner surface of the respective port opening.

[0010] In an embodiment, the port openings of the plate heat exchanger are arranged with port linings, wherein the at least one sensor of said at least one slave monitoring device and / or the at least one sensor of the master monitoring device is arranged on an exterior side of an area of the respective port lining contacting the fluid.

[0011] In another embodiment, he at least one sensor of said at least one slave monitoring device and / or the at least one sensor of the master monitoring device is arranged on an interior side of an area of the respective port lining contacting the fluid.

[0012] In an embodiment, the communication modules are arranged within the respective port lining.

[0013] In an embodiment, the communication modules are arranged at the front or back plate in connection to the respective port opening.

[0014] In an embodiment, the at least one slave monitoring device and / or the master monitoring device is arranged at the front or back plate around a periphery of the respective port opening.

[0015] In an embodiment, the at least one slave monitoring device and / or the master monitoring device comprises a circular fastening member for fastening the monitoring device to the end plate around the port opening and a housing in which the communication module and the at least one sensor is accommodated.

[0016] In an embodiment, the at least one sensor of said at least one slave monitoring device and / or the at least one sensor of the master monitoring device is arranged on an interior side of an area of the respective circular fastening member contacting the fluid.

[0017] In an embodiment, the at least one sensor of said at least one slave monitoring device and / or the at least one sensor of the master monitoring device is arranged to protrude through the respective circular fastening member for contacting the fluid.

[0018] In an embodiment, the at least one slave monitoring device and / or the master monitoring device comprises a proximity sensor arranged at the end plate for determining opening of the heat exchanger by detecting displacement of the end plate, i.e. the front or back plate. The back plate of the heat exchanger is sometimes referred to as a pressure plate while the front plate sometimes is referred to as a frame plate.

[0019] In an embodiment, the communication modules are configured to be in wired connection with the respective at least one sensor.

[0020] In an embodiment, the communication modules are configured to be in wireless connection with the respective at least one sensor.

[0021] In an embodiment, the measured property of the fluid is one or more of temperature, pressure and viscosity.

[0022] In an embodiment, each of the monitoring devices (120, 123) is assigned an identifier.

[0023] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / an / the element, apparatus, component, means, step, etc." are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Aspects and embodiments are now described, by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a front view of a prior art plate heat exchanger comprising a plurality of heat exchanger plates, in which heat exchanger embodiments may be implemented; Figure 2 shows a side view of the plate heat exchanger of Figure 1 taken along line II-II; Figure 3 shows a heat exchanger in which embodiments may be implemented; Figure 4 shows a master-slave arrangement according to an embodiment; Figure 5 shows arranging of a monitoring device in a port lining according to an embodiment; Figure 6 shows a monitoring device according to another embodiment; Figures 7 and 8 show a monitoring device according to yet another embodiment; and Figure 9 shows a heat exchanger comprising a proximity sensor according to an embodiment. DETAILED DESCRIPTION

[0025] The aspects of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown.

[0026] These aspects may, however, be embodied in many different forms and should not be construed as limiting; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and to fully convey the scope of all aspects of invention to those skilled in the art. Like numbers refer to like elements throughout the description.

[0027] Figures 1 and 2 show a plate heat exchanger 10 comprising a plurality of heat exchanger plates 1 forming a plate package. Each heat exchange plate 1 extends along a respective extension plane p. The heat exchanger plates 1 are arranged adjacent to each other to define several first plate interspaces 2 for a first medium and several second plate interspaces 3 for a second medium. The first plate interspaces 2 and the second plate interspaces 3 are arranged in an alternating order in the plate package.

[0028] A gasket 13 is arranged at a periphery of each plate 1 for sealing the plate interspace between two adjacent heat exchanger plates.

[0029] The heat exchanger plates 1 of the plate package are suspended on a mounting beam 4, which extends perpendicular to the extension planes p of the heat exchanger plates 1.

[0030] The heat exchanger plates 1 are pressed against each other between a frame plate 5 and a pressure plate 6 by means of tie bolts 7.

[0031] The plate heat exchanger comprises four porthole channels 8a-8d, where for instance first channel 8a and second channel 8b form an inlet and an outlet, respectively, for the first medium while third channel 8c and fourth channel 8d form an inlet and an outlet, respectively, for the second medium.

[0032] For instance, the first medium in the form of hot liquid enters through the first channel 8a and leaves through the second channel 8b. Correspondingly, the second medium in the form of cold liquid enters through the third channel 8c and leaves through the fourth channel 8d.

[0033] As the fluids pass through the heat exchanger, heat is transferred from the hot media to the cold media in that the hot media passes through the heat exchanger via the first plate interspaces 2 while the cold media passes through the heat exchanger via the second plate interspaces 3, the first plate interspaces 2 being physically separated from, but thermally connected to, the second plate interspaces 3 by means of the heat exchanger plates 1.

[0034] Thus, the hot liquid entering through the first channel 8a flows in a downwards direction in the respective first plate interspace 2 and leaves through the second channel 8b while the cold liquid entering through the third channel 8c flows in an upwards direction in the respective second plate interspace 3 and leaves through the fourth channel 8d.

[0035] Further, one or more sensors (not shown) may be arranged at one or more plates for measuring for instance temperature, pressure, viscosity, etc., of the liquid being transported in the heat exchanger. The sensor is typically formed by an electrically conducting probe, strip, foil or wire extending into the plate interspaces 2, 3 for contacting the hot / cold in order to measure e.g. temperature.

[0036] The sensor is in contact, and thus in communication, with a communication module 20 arranged at each plate where the measuring is to be performed.

[0037] The communication module 20 in its turn communicates wirelessly, by means of e.g. radio-frequency identification (RFID), with a master unit 28 which may comprise a display 36 for presenting data associated with the measurements undertaken by the sensor(s) to an operator of the GPHE. The master unit is arranged with antenna 29 for communication with an antenna (not shown) of the communication module 20.

[0038] Now, an issue of the prior art plate heat exchanger illustrated in Figures 1 and 2 is that the sensors and communication modules 20 are arranged in, or at least in connection to the plate interspaces 2, 3, which is a demanding environment for electronic equipment.

[0039] This issue is resolved in an embodiment to be described with reference to Figure 3 showing a front view of a plate heat exchanger 100 similar to that described with reference to Figures 1 and 2.

[0040] However, a difference between the heat exchanger of this embodiment and the prior art heat exchanger 10 of Figures 1 and 2 is that the sensors and communication modules are arranged in a port opening 101, 104 in a front plate 110 of the heat exchanger 100 where fluid enters or exits the heat exchanger 100, as will be described in more detail in the following. As is understood, a heat exchanger 100 in which embodiments are implemented may comprise more than four port openings and it may also be envisaged that one or more port openings are arranged in the front plate 110 while one or more port openings are arranged in the back plate 111.

[0041] Figure 4 shows the front plate 110 of the heat exchanger 100 comprising four port openings 101-104. As previously described, fluid in the form of hot liquid enters via a pipe (not shown) through the first port opening 101 and leaves via another pipe through the second port opening 102. Correspondingly, cold liquid enters via a pipe through the third port opening 103 and leaves via another pipe through the fourth port opening 104.

[0042] Figure 4 shows in an embodiment one master monitoring device 120 arranged at first port opening 101 and three slave monitoring devices 121, 122, 123 arranged respectively at second port opening 102, third port opening 102 and third port opening 103.

[0043] Further shown is a sensor 150 arranged to measure a property of the fluid exiting the fourth port opening 104. As is understood, while only sensor 150 is shown in Figure 4, such a sensor is typically arranged in each port opening 101-104 for measuring the property. Moreover, a number of sensors may be arranged in each individual port opening 101-104 for measuring various properties of the fluid such as for instance temperature, pressure, flow, etc. In the following exemplifying embodiment, the sensor 150 is assumed to measure the temperature of the fluid exiting the fourth port opening 104. While the monitoring devices 120-123 are illustrated to be arranged at the front plate 110, it may alternatively be envisaged that they are arranged at the back plate 111 in case the port openings are arranged in the back plate 111.

[0044] In this particular embodiment, each port opening 101-104 is arranged with a so-called port lining 125-128 utilized for protecting the front plate 110 from the fluid entering / exiting the heat exchanger 100. The front plate 110 is typically made from carbon steel, while the port linings 125-128 may be made from for instance stainless steel, titanium, rubber, etc. The sensor 150 is in this embodiment arranged on an exterior side of an area of the port lining 128 contacting the fluid. As discussed below in connection to an alternative embodiment, the sensor 150 maybe arranged on an interior side of the port lining 128 for contactless measurement.

[0045] As is understood, if port linings are not utilized for protecting the front plate 110, the sensor 150 would be placed on an inner surface of the port opening in the front plate 110 forming the port opening 104, thereby being in contact with the liquid exiting through the port opening 104.

[0046] In the following, the function of the third slave monitoring device 123 will be described. The first slave monitoring device 102 and the second slave monitoring device 103 are typically identical with the third slave monitoring device 104.

[0047] The third slave monitoring device further comprises a communication module 130 arranged to acquire data indicating the measured temperature from the sensor 150. In this particular example, there is a wire connecting the sensor 150 and the communication module 130 for transmission of the measured temperature, but it may be envisaged that the sensor 150 and the communication module 130 is able to communicate wirelessly. Such implementation would however require the sensor to be arranged with wireless communication capability.

[0048] While the communication module 130 in this particular example is arranged at a periphery of the port opening 104, the communication modules are not necessarily arranged adjacent to the port 104, but may be arranged at any appropriate location of the front plate 110.

[0049] However, placing the communication module 130 close to the sensor 150 would make communication between the two less susceptible to disturbances appearing at the connecting wire between the sensor 150 and the communication module.

[0050] The third slave monitoring device 123 will thus via its communication module 130 communicate the measured temperature values wirelessly to a corresponding communication module 131 of the master monitoring device 120 (as will the first slave monitoring device 121 and the second slave monitoring device 121).

[0051] While the communication between the slave monitoring devices 121,122, 123 and the master monitoring device 120 is described herein as wireless, it maybe envisaged that the communication is undertaken via wire between the slave monitoring devices 121, 122, 123 and the master monitoring device 120.

[0052] The master monitoring device 120 will in its turn communicated the measurement data received from the slave monitoring devices 121-123, as well as data from its own sensor 160, to a remote location illustrated by server 140 and / or a smart phone 141. In this example, the sensor 160 (e.g. a temperature sensor) of the master device is, similar to the sensor 150 of the third slave device 120, arranged on the exterior side of the area of the port lining 125 contacting the fluid. While the master monitoring device 120 in this example comprises a sensor 160, it may be envisaged that the master monitoring device 120 is utilized for communicating with the slave monitoring devices 121-123 and the server 140 or smart phone 141 without undertaking any measurements of its own, in which case it may not be arranged with the sensor 160.

[0053] This may be a supervision centre on the premises of where the heat exchanger 100 is located, such has a factory or some other industrial environment where maintenance personnel supervises the heat exchanger 100 (possibly one out of hundreds of heat exchangers being supervised). Alternatively, the server 140 may belong to a manufacturer of the heat exchanger 100 any thus the server 140 may even be located in another part of the world then the heat exchanger 100. In another example, the remote location is embodied by a smart phone 141 of a service technician, via which smart phone the service technician straightforwardly can access the measurement data communicated by the monitoring devices.

[0054] An advantage of utilizing the master-slave system illustrated in Figure 4 is that while the master monitoring device 120 may be required to be capable of long-range communication, such as over hundreds and even thousands of kilometres, thereby likely requiring a Subscriber Identity Module (SIM) card for enabling the communication, the slave monitoring device are only required to be capable of short range communication, such as WiFi, Bluetooth, near-field communication (NFC), Radio-frequency identification (RFID) communication, etc, which greatly lowers requirements on the communication module.

[0055] Further, each monitoring device 120-123 may be associated with an identifier via which each individual monitoring device 120-123 can be uniquely identified. It may be envisaged that an operator of the heat exchanger 100 can assign and / or read the respective identifier during a confirmation setup via e.g. a display (not shown) of the heat exchanger 100 or by using e.g. a smart phone 141, possibly in combination with a QR or RFID code. As is understood, the monitoring devices 120-123 may already be associated with the identifier upon the heat exchanger 100 being delivered.

[0056] Further advantageous is that the communication modules 130,131 are placed at the front plate 110 rather than at intermediate plates between the front plate 110 and an end plate (not shown) of the heat exchanger 100. Firstly, this is far less challenging environment in terms of e.g. temperature and humidity. Secondly, the communication modules can be easily reached by maintenance personnel if required, since the modules 130, 131 are arranged at the front plate 110, which is also true for the sensors 120, should the sensors require maintenance.

[0057] There are numerous advantages of using the slave-master monitoring system described hernia, for instance: sensor may continuously measure a desired property such as pressure with low sample rate but be activated at rapidly occurring changes to measure pressure peaks; such function would help a user monitor the general heat exchange process as well as predicting fatigue-based lifetime of e.g. the gaskets: pressure measurements can facilitate detecting heat exchanger fouling; a physical location of the heat exchanger can be detected using e.g. Global Positioning System (GPS); one or more of the monitoring devices may contain identification and type of heat exchanger, which when connected may trigger links to installation data, user manuals or spare parts lists in the monitoring device. It may even make it possible to order correct spare parts sent to the correct address from the monitoring device; an alert may be provided if the sensor data indicates that a service of the heat exchanger should be performed, etc.

[0058] Figure 5 illustrates a further embodiment of placement of a master / slave monitoring device.

[0059] Thus, for the port opening 104, the port lining 128 inserted therein in order to protect the front plate of the heat exchanger in this embodiment comprises the slave monitoring device illustrated by means of the sensor 120 and the communication module 130.

[0060] Advantageously, by including the complete slave / master communication device inside the port lining 128, the sensor 120 is further protected from coming into physical contact with the liquid flowing in the port opening 104.

[0061] Further, replacement of a faulty slave / master monitoring device is handled by simply changing the port lining 128 for a new port lining comprising a correctly functioning slave / master monitoring device.

[0062] In case pressure is to be measured, it is possible to arrange a pressure sensor within the port lining 128 along with the temperature sensor, where the pressure is measured by the pressure sensor measuring mechanical tension at an interior side of the area of the port lining 128 contacting the fluid.

[0063] Further, it is envisaged in an embodiment that the sensors 150,160 are placed within the port linings 125, 128 while the corresponding communication modules 130, 131 are attached to the front plate 110 as shown in Figure 4.

[0064] Figure 6 illustrates a further embodiment where the master / slave monitoring device 123 is arranged at the front plate 110 around a periphery of the port opening 104 of the heat exchanger 100. The monitoring device 123 is fastened to the front plate 110 by being fitted between attachment members 135 arranged to attach the previously mentioned pipes to each port opening.

[0065] Figures 7 and 8 illustrate the master / slave monitoring device 123 in a different view.

[0066] The monitoring device 123 comprises in this embodiment a circular fastening member 123a for fastening the monitoring device 123 to the front plate 110 and thus the port opening 104, and a housing 123b in which the communication module 130 and the sensor 150 is accommodated. In this example, in addition to the temperature sensor 120 a pressure sensor 129 is further included.

[0067] In Figure 8, it shown that the none of the communication module 130, temperature sensor 120 or pressure sensor 129 are in contact with the liquid flowing through the port opening 104. However, as previously described, it may be envisaged that the temperature sensor 120 and / or the pressure sensor 129 measures temperature and / or pressure by contacting an interior side of the housing 123b for contactless measurement, thus avoiding sensor contact with the liquid.

[0068] Again, by including the complete slave / master communication device inside the housing 123b, the sensors 150, 151 are advantageously further protected from coming into physical contact with the liquid flowing in the port opening 104.

[0069] As is understood, all communication modules 130, 131 require powering. For the slave devices 121-123, powering may be performed by a local power unit, but it may also be envisaged that energy may be harvested from wireless signals received from the master device 120, if the slave devices 121-123 utilize a low-power communication technology such as NFC. The master device 120, which may be required to communicate over a longer distance, may need a local power unit.

[0070] Further advantageous is that replacement of a faulty slave / master monitoring device 123 is handled by simply detaching the circular fastening member 123a from the front plate 110 for removing the faulty slave / master monitoring device 123 and adding a new correctly functioning slave / master monitoring device, or by just detaching the housing 123b comprising the communication device for replacement.

[0071] In a further embodiment, to add further functionality to the monitoring system, it may be of relevance to detect if the plate heat exchanger 100 has been opened and how often this occurs. The master and slave system is highly suitable for add-ons of separate sensors, without the need for any wiring.

[0072] With reference to Figure 9 illustrating the plate heat exchanger 100 previously described with reference to Figure 3, by arranging a master and / or slave monitoring device (not shown in Figure 9) with a proximity sensor 170, it is possible to determine if the heat exchanger 100 has been opened (by a user loosening the tie bolts 171 of carrying bar 171 on which the plates are fastened by means of the tie bolts 172. The sensor 170 is typically in wired connection with a slave / master monitoring device thus communicating if the front plate 110 is being displaced (i.e. that the plate heat exchanger 100 has been opened) as determined by the proximity sensor 170 registering the displacement.

[0073] The aspects of the present disclosure have mainly been described above with reference to a few embodiments and examples thereof. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.

[0074] Thus, while various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Claims

1. An arrangement configured to monitor a plate heat exchanger (100), comprising: at least one slave monitoring device (123) comprising at least one sensor (150) arranged in a port opening (104) in an end plate (110, 111) of the heat exchanger (100) where fluid enters or exits the heat exchanger, the sensor (150) being arranged to measure a property of said fluid; the at least one slave monitoring device (123) further comprising a communication module (130) configured to acquire a data set indicating the measured property of the fluid from the at least one sensor (150) of the slave monitoring device (123) for communicating said data to a master monitoring device (120) comprised in the arrangement; the master monitoring device (120) comprising at least one sensor (160) arranged in another port opening (101) in the end plate (110, 111) of the heat exchanger (100) where fluid enters or exits the heat exchanger (100), the sensor being arranged to measure a property of said fluid; the at least one master monitoring device (120) further comprising a communication module (131) configured to acquire a data set indicating the measured property of the fluid from the at least one sensor (160) of the master monitoring device (120), and the data indicating the measured property of the fluid from the at least one sensor (150) of the slave monitoring device (123), for communicating the data sets to a remote location (140).

2. The arrangement of claim 1, wherein: the at least one sensor (150) of said at least one slave monitoring device (123) and / or the at least one sensor (160) of the master monitoring device (120) is arranged on an inner surface of the respective port opening (104, 101).

3. The arrangement of claim 1, wherein the port openings (104, 101) of the plate heat exchanger (100) are arranged with port linings (125, 128): the at least one sensor (150) of said at least one slave monitoring device (123) and / or the at least one sensor (160) of the master monitoring device (120) is arranged on an exterior side of an area of the respective port lining (125, 128) contacting the fluid.

4. The arrangement of claim 1, wherein the port openings (104, 101) of the plate heat exchanger (100) are arranged with port linings (125, 128): the at least one sensor (150) of said at least one slave monitoring device (123) and / or the at least one sensor (160) of the master monitoring device (120) is arranged on an interior side of an area of the respective port lining (125, 128) contacting the fluid.

5. The arrangement of claim 4, wherein: the communication modules (130,131) are arranged within the respective port lining (130, 131).

6. The arrangement of any one of the preceding claims, wherein: the communication modules (130, 131) are arranged at the end plate (110, 111) in connection to the respective port opening (125, 128).

7. The arrangement of claim 1, wherein: the at least one slave monitoring device (123) and / or the master monitoring device (120) is arranged at the end plate (110, 111) around a periphery of the respective port opening (104, 101).

8. The arrangement of claim 7, wherein: the at least one slave monitoring device (123) and / or the master monitoring device (120) comprises a circular fastening member (123a) for fastening the monitoring device (123) to the end plate (no, 111) around the port opening (104) and a housing (123b) in which the communication module (130) and the at least one sensor (150) is accommodated.

9. The arrangement of claim 8, wherein: the at least one sensor (150) of said at least one slave monitoring device (123) and / or the at least one sensor (160) of the master monitoring device (120) is arranged on an interior side of an area of the respective circular fastening member (123a) contacting the fluid.

10. The arrangement of claim 8, wherein: the at least one sensor (150) of said at least one slave monitoring device (123) and / or the at least one sensor (160) of the master monitoring device (120) is arranged to protrude through the respective circular fastening member (123a) for contacting the fluid.

11. The arrangement of claim 8, wherein: the at least one slave monitoring device (123) and / or the master monitoring device (120) comprises a proximity sensor (170) arranged at the end plate (110, 111) for determining opening of the heat exchanger (100) by detecting displacement of the end plate (110, 111).

12. The arrangement of any one of the preceding claims, wherein: the communication modules (130,131) are configured to be in wired connection with the respective at least one sensor (150, 160).

13. The arrangement of any one of the preceding claims, wherein: the communication modules (130,131) are configured to be in wireless connection with the respective at least one sensor (150, 160).

14. The arrangement of any one of the preceding claims, wherein: the measured property of the fluid is one or more of temperature, pressure, flow and viscosity.

15. The arrangement of any one of the preceding claims, wherein: each of the monitoring devices (120, 123) is assigned an identifier.

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