Technical field The present invention relates to a device for detecting and determining the weight of icing on the power line for powering electric vehicles. The device comprises a housing which accommodates a strain gauge load cell coupled to a measuring member arranged outside the housing and which further accommodates an evaluation module.

Background art

Availability and high reliability of power lines for powering electric vehicles designed, among other things, for autonomous charging of electric platforms used outdoors is an essential condition for the development of autonomous electromobility. The operational reliability of power lines for powering electric vehicles, such as traction lines, is threatened by various undesirable phenomena, including icing and glaze ice in the cold months of the year, which inhibit transmission of electricity. Reliable and accurate monitoring and subsequent timely removal of icing and glaze ice is an important part of the maintenance of power lines for powering electric vehicles and can indirectly, especially in mountainous regions, have a major impact on the development of autonomous electric platforms and their operation.

Electrically powered urban and interurban transport vehicles, such as trolleybuses, trams or trains, are equipped with a collection system and powered via a current collector from the overhead contact line, which is one of the types of traction line, i.e., power line for powering electric vehicles. Charging stations for autonomous electric platforms, e.g., of agricultural machinery, construction machinery, trucks, public transport vehicles or vehicles for individual passenger transport, may be equipped with a power line to charge the battery of the autonomous electric platform. The battery of the autonomous electric platform is charged in such a way that the autonomous electric platform is equipped with a pantograph current collector and is charged in the charging station, while the collector touches the power line.

When the temperature drops below freezing point, icing or glaze ice may be created on the power lines for powering electric vehicles. The layer of ice can be so thick that the power line wire turns into an insulated conductor and the vehicle loses the ability to draw current from the lines. In extreme cases, the amount of the icing can damage the power lines.

In order to implement timely measures to remove icing from the power lines for powering electric vehicles, it is advisable to ensure a reliable measurement of the formation and thickness of ice on the lines, preferably directly at the point of icing or glaze ice formation.

Document CZ UV 10432 discloses an icing weight meter, consisting of a measuring member in the form of a vertical metal measuring cylinder, which is firmly connected by a horizontal connecting rod made of insulating material to a load cell, e.g., a thermally compensated strain gauge bridge, placed in a mechanically rigid body and coupled to an electrical evaluating part of the device, the electrical evaluating part being separated from the detection part of the device and located outside the inner space of the body. The connecting rod partially protrudes from the body, whereby the opening in the vertical wall of the body through which the rod passes is heated by a bushing with a heating element. The heating of the bushing by the heating element is regulated using a heating element control and a temperature sensor mounted on the connecting rod, so that the temperature in the bushing is maintained between 0 °C and 1 °C.

The icing weight meter with a vertically oriented measuring metal cylinder is not suitable for measuring icing on the power lines for powering electric vehicles, since its measuring member is not exposed to the same effect of meteorological conditions, especially rainfall, wind and and solar radiation, as power-line conductors, and icing may therefore form on it in a different way from the icing formation on the power lines. Another disadvantage of the measuring device according to CZ UV10432 is firm connection of the connecting rod to the strain gauge, which makes it difficult to remove the strain gauge in case of need, e.g., for replacement or calibration. The calibration device in CZ UV10432 is integrated directly into the body of the icing weight meter, thus increasing the installation size of the body and increasing the manufacturing costs of the device. Another disadvantage of the icing weight meter according to CZ UV10432 is the fact that the electric evaluating part of the device is located separately outside the body with the load cell, which complicates the installation of the device at the place of its use near the power lines of a charging station for autonomous electrical platforms and increases installation costs.

The object of the invention is to eliminate or at least minimize the disadvantages of the background art by providing a device for detecting and determining the weight of icing on the power lines for powering and/or recharging electric vehicles and for charging stations of autonomous electric platforms, which is reliable, accurate, compact and has low production costs.

Principle of the invention

By icing is meant in this application for invention an ice layer which is formed on the surface of objects by the effect of meteorological conditions, i.e., icing in the narrower sense, glaze ice or rime.

The invention relates to a device for detecting and determining the weight of icing on the power line for powering electric vehicles, comprising a housing which accommodates a strain gauge load cell connected to a measuring member arranged outside the housing and which further accommodates an evaluation module, whereby the principle of the invention consists in that the housing comprises a base body in which is rotatably mounted a holder in which a measuring member is mounted at one end perpendicularly to the axis of rotation of the holder and in the horizontal direction, the holder being in contact with a load strain gauge cell which is coupled to an evaluation module.

The advantage of the horizontal arrangement of the measuring member in the holder is the fact that the measuring member thus arranged is oriented substantially in the same manner as the horizontally arranged monitored power line for powering electric vehicles and is therefore also exposed to the same direction of gravity acting on the ice-forming layer and also to substantially the same direction of weather conditions that affect the formation of icing on the monitored line, e.g., the same air flow speed and air flow direction, the same speed and direction of impact of water drops and snowflakes, the same direction and thus also the intensity of sunlight. In addition, the measuring member, which is mounted in the rotatably mounted holder perpendicularly to the axis of rotation of the holder, allows the housing of the device to be placed on a power line carrier together with the monitored power line or next to it, e.g., on the same side of the mast, the same side of the power line stand of the charging station, the same side of the power line pole, etc., so that the measuring member is not only oriented in the same way as the monitored power line, but also is not shielded by the carrier on which it is located from the weather conditions to which the monitored power line is exposed.

In a preferred embodiment, the measuring member is formed by a length limited piece of material from which the monitored power line for powering electric vehicles is built.

In the preferred embodiment of the device for detecting and determining the weight of icing on the power line of electric vehicles, the measuring member consists of a sample of the monitored power line, in the vicinity of which the device for detecting and determining the weight of icing is located, whereby it is mounted parallel to the monitored power line. This ensures that the layer of icing growing on the measuring member with high reliability corresponds to the layer of icing that grows on the monitored power line, since the measuring member is not only exposed to the same weather conditions due to its orientation and location, but also has the same or similar properties which influence the icing growth as well as the icing melting. A device equipped with such a measuring member is not only capable of detecting icing and determine the weight of icing on the power line more reliably than a device with another, conventional, measuring member, but can also determine more reliably the time for which the icing formed on the power line remains.

In a first variant, the invention presented above comprises a measuring member holder which is formed by a double arm lever, whereby the front arm of the lever constitutes the front part of the holder, which partly protrudes from the base body, and the measuring member is mounted in the front part of the holder, outside the interior of the housing. The rear arm of the lever constitutes the rear part of the holder and is arranged below a strain gauge load cell. Mounted in the rear part of the holder is a contact element which is in contact with the working surface of the strain gauge cell on which it abuts. The contact element is pressed against the working surface of the strain gauge cell due to the weight of the front part of the holder, the weight of the measuring member and, if necessary, also the weight of icing deposited thereon.

In a second variant of the invention, the holder consists of a single arm lever in which is mounted a contact element which divides the holder into the front part of the holder which protrudes from the base body of the housing and which accommodates the measuring member, and the rear part of the holder, which is arranged above the strain gauge load cell, whereby the contact element is in contact with the working surface of the strain gauge load cell located below it. In this variant of the invention, too, the contact element abuts on the working surface of the load cell and is pressed against it due to the weight of the holder, the weight of the measuring member, the weight of icing deposited on the measuring member and the weight of the holder.

The advantage of the two above-described variants of the invention is that they allow the contact element which abuts on the working surface of the load cell, not to be fixedly attached to the load cell, which, upon a change in the load of the holder or the measured sample, guarantees the freedom of horizontal movement of the contact element over the working surface of the strain gauge load cell. The fact that the contact element does not have to be attached to the load cell in both variants described above also facilitates the mounting of the holder in the base body of the device. In both variants described above, an affordable single point load cell can be advantageously used instead of other more expensive types of strain gauge cells, e.g., bending sensors.

In a preferred embodiment, the holder is rotatably mounted in the base body in a bearing which is mounted in a bearing hinge mounted in the base body in the interior of the housing. Such a mounting of the holder makes it possible to use a durable bearing mounted in a metal hinge, both the bearing and the hinge being entirely accommodated in the interior of the housing, in which they are closed and thermally insulated from the surroundings of the housing.

Furthermore, it is advantageous if the base body is provided with sidewalls with cavities filled with thermal insulation which thermally insulate the interior of the housing from the surroundings of the device housing, helping to keep the temperature in the interior of the housing above freezing point and thus preventing the bearing of the holder from freezing.

In another preferred embodiment, the evaluation module comprises an electrical voltage amplifier, the input of which is connected to the output of the strain gauge cell, whereby the output of the amplifier is connected to the input of an AD converter, the output of which is connected to the input of a computing unit which serves to detect icing and determine the icing weight on the measuring member.

In another embodiment of the device, the strain gauge load cell consists of an encapsulated strain gauge load cell with four active foil strain gauges connected into into a Wheatstone bridge. The advantage of such a strain gauge load cell is that, in contrast to the connection with one or two active foil strain gauges, it compensates for the effect of the change in the strain gauge temperature and the different thermal expansion of the strain gauge load cell and foil strain gauges caused by it. Thus, this strain gauge load cell can be advantageously used in a compact device for detecting and determining the weight of icing, in which it is housed in a common base body together with the evaluation module and optionally with other electronic components, without the heat radiated by the electronic components negatively affecting measurement reliability.

In a preferred embodiment, the device can detect whether the load detected is really caused by the icing being deposited or whether it is caused by another body, thus preventing false detection of icing. In this embodiment, the evaluation module is coupled to a temperature sensor and to an air humidity sensor, which are arranged outside the interior of the housing, wjhereby the data outputs from the temperature sensor and the air humidity sensor are connected to the input of the computing unit. The device for detecting and determining the weight of icing can freeze at temperatures below freezing and at high relative humidity, e.g., by condensing air humidity in the bearing which forms ice, which prevents the holder from moving in the bearing and the device is disabled. To prevent freezing of the device components in the interior of the housing, a heating element for heating the interior of the housing is mounted in the interior of the housing, the heating element being preferably mounted in the base body and/or or on the side wall, closing the base body, thus facilitating its installation in the housing of the device.

In a preferred embodiment of the heating of the interior of the body, the device for detecting and determining the weight of icing which saves electricity consumption for heating, the heating element is controlled, switched on and off using the data on temperature and air humidity in the surroundings of the device. A heating element regulation module is connected to the heating element, whereby a sensor for measuring temperature and a sensor for measuring air humidity are by their outputs connected to the regulation module, both the sensors being arranged outside the interior of the housing.

In another preferred embodiment of the heating of the interior of the device housing, which can be used as an alternative of regulating the heating element using the data on temperature and air humidity in the surroundings of the device or in case of temperature or humidity sensor failure, can be used as a backup, the heating element regulation module is connected to the heating element and coupled to a transmission module accommodated in the interior of the housing in the base body, whereby the data output of the data for the remote control of the heating element is connected from the transmission module to the input of the heating element regulation module.

Description of drawings

The invention is schematically represented in the drawings, wherein Fig. 1 shows a view of the device, Fig. 2 shows a horizontal a horizontal cross- section through the device the device in the variant of the holder with a double arm lever, Fig. 3 shows a vertical cross-sectional view of the device in the variant of the holder with a double arm lever, Fig. 4 shows a vertical cross- sectional view of the device in the variant of the holder with a single arm lever, Fig. 5 shows a side view of an open device with a sidewall of the housing removed.

Examples of embodiment

The invention will be described with reference to an exemplary embodiment of a device for detecting icing and determining the weight of icing which is formed on the power line for powering electric vehicles. The device is intended to be located in the vicinity of the power lines for the powering and/or charging of electric vehicles and for charging stations of autonomous electric platforms.

The device for detecting and determining the weight of icing (Figs. 1 , 2, 3, 4, 5) comprises a housing 1, adapted to be mounted on a mast of the power line of electric vehicles, on a housing of a weather station, etc. The frame of the housing 1 is formed by a base body 10 in which a horizontally oriented elongated holder 2 is mounted rotatably about a horizontal axis 24 of rotation. In the front part 22 of the holder 2, which protrudes from the body 10 of the housing 1, a measuring member 9 is arranged outside the interior of the housing 1 perpendicularly to the axis 24 of rotation of the holder 2 in the horizontal direction. In the interior of the housing 1, a strain gauge load cell 4 is mounted on the inner wall of the base body 10. The rear part 23 of the holder 2 is pressed to the strain gauge load cell 4 which is thus coupled to the measuring member 9 by means of the holder 2. In the interior of the housing l _^ next to the strain gauge load cell an evaluation module 6 for processing and evaluating a signal from the load cell 4 is mounted in the base body and coupled to the load cell h The evaluation module 6 is provided with means for detecting and determining the weight of icing on the power line.

In an exemplary embodiment of the invention, the horizontally oriented elongated measuring member 9 is formed by is formed by a length limited piece of material from which the monitored power line for powering electric vehicles is built, so that its specific heat capacity, specific thermal conductivity, colour, surface roughness, surface wettability, transverse profile, location and orientation correspond to the power line being monitored. The advantage of this arrangement and orientation of the measuring member 9 is the fact that it allows to locate the device for detecting and detecting the weight of icing on a mast or another suitable carrier of the power line of electric vehicles so that the measuring member 9 is oriented parallel to the monitored power line. As a result, the measuring member 9 is exposed to the same weather conditions that may affect icing deposition on the power line.

Another advantage of this arrangement and orientation of the measuring member 9 in the holder 2 consists in minimization of unwanted heating of the measuring member 9 by the heat emitted by the body 10. The measuring member ^ mounted in the holder 2 with only one end thereof and oriented parallel to the lever arm of the holder g is exposed to thermal radiation of the body 10 by a smaller part of its surface than the measuring member 9 mounted transversely to the lever arm of the holder 2. In addition, the surface of the measuring member 9 oriented parallel to the lever arm of the holder 2 is on average situated at a greater distance from the body 10 than the surface of the measuring member 9 mounted transversely to the lever arm of the holder 2, since the free end of the measuring member 9 is situated at a greater distance from the body 10 than the free end of the measuring member_9 mounted transversely to the lever arm of the holder 2.

In a specific embodiment, the length of the part of the measuring member 9 which freely protrudes from the holder 2 is 1 m.

In the holder 2, in the interior of the housing l _^ a contact element 21 is mounted (Fig. 3, Fig. 4, Fig. 5), by means of which the holder 2 abuts on the load cell 4. The load cell 4 comprises a functional working surface 41 for measuring the load on its surface. The load cell 4 and the holder 2 are arranged one above the other in the interior of the body 10 so that the contact element 21 abuts on the working surface 41 to which it is not attached and is pressed against it due to the weight of the holder 2 and the measuring member 9 mounted in it.

In the first variant of the invention (see Fig. 3, Fig. 5), the holder 2 is formed by a double arm lever whose front arm constitutes the front part 22 of the holder 2, which protrudes horizontally from the interior of the housing 1 through the vertical wall of the base body 10 and in which the measuring member 9_is mounted. The rear arm of the lever constitutes the rear part 23 of the holder 2 arranged below the strain gauge load cell 4. A pressure element 21_ is mounted in the rear part of the holder 2. The pressure element 21_ is in contact with the working surface 41 of the strain gauge load cell 4 which arranged above the pressure element 21. The contact element 21 abuts on the working surface ±, being pressed against it due to the weight the front part 22 of the holder and the weight of the measuring member 9. The holder 2 in the body 10 is mounted in a bearing 3 arranged between the front and the rear arm of the lever, between the front part 22 and the rear part 23 of the holder 2, between the measuring member 9 and the contact element 21.

In the second variant of the invention (see Fig. 4), the holder 2 is made as a single arm lever in which a contact element 21_ is mounted. The contact element 21 divides the holder 2 into a front part 22 and a rear part 23. The front part 22 of the holder 2, in which the measuring member 9 is mounted, similarly as in the first variant, horizontally protrudes through the vertical wall of the body 10 from the interior of the housing 1_. The rear part 23 of the holder 2, is arranged above the load cell 4, whereby the contact element 21 is in contact with the working surface 41 of the load cell 4 arranged below it. The holder 2 is mounted in the body 10 rotatably in the bearing 3, ideally at the inner end of the holder 2.

In both variants of the invention described above, the holder 2 is made of a known thermal insulating material, e.g., of plastic. The contact element 21 is in both variants of the invention described above (Fig. 3, Fig. 4) designed as a flat-head screw which abuts with the surface of the screw head on the functional measurement working surface 41 of the load cell 4. The contact element 21_ is in the exemplary embodiment mounted in the holder 2 such that it acts by force perpendicularly on the measurement working surface 41 of the load strain gauge cell 4 with strain gauges 43 mounted in the cavity 42 of the load cell.

In another embodiment of the invention, the contact element 4 with the working surface 41 is designed in another suitable way, for example as an adjustable screw secured with a nut, a pin, a sleeve or as a protrusion of the body of the holder 2. In another embodiment of the invention, the contact element 21_ is provided with a flexible member (not shown), e.g., a metal coil spring, a rubber pin, a rubber ball, a rubber sleeve or a rubber ring, which is deformed by the contact element 21_ acting on the working surface 41. so that the surface with which the contact element 21_ abuts on the working surface 41 of the load cell 4, rests on the working surface 41 and flexibly adapts to it. In addition, such a flexible member acts as a damper for the transmission of undesired vibrations of the contact element 21_, which are caused by air flow around the holder 2 and the measuring member 9 and/or wind gusts acting on the holder 2 and the measuring member 9.

The bearing 3 is mounted in the base body 10 in a hinge 31 so that the entire hinge 31, the hinge fixing means 31 and the bearing 3 are situated in the interior of the housing 1, in which they are closed and are thus thermally insulated from the external environment of the housing 1. This eliminates a thermal bridge between the surface of the housing 1 and the interior of the housing 1, which would form the hinge 31 of the bearing 3 if it protruded onto the surface of the housing 1. This is advantageous especially in the variant of the bearing 3, wherein the hinge 31 and/or the means with the aid of which it is fixed in the wall of the body 10 are made of a metal material with high thermal conductivity, e.g., of steel or aluminium.

In an exemplary embodiment, the body 10 is made of polyamide PA6 by 3D printing followed by machining.

In another embodiment, the body 10 is made of another type of plastic or of a composite material with plastic.

In another embodiment, the body 10 is made of another suitable rigid and solid thermal insulating material having a specific thermal conductivity lower than 0.4 W m ¹ K ¹ .

The body 10 is on both sides provided with sidewalls 11 (Figs. 1 , 2) adapted to close the sides of the body 10. The sidewalls are made, for example, of polyamide PA6 by 3D printing.

To improve the thermal insulation of the interior of the body Id the sidewalls H are doubled and form a cavity 110 closed between the inner wall 11a and the opposite outer wall Hb. The cavities 110 of the sidewalls 1J_ may be filled with another thermal insulating material which has lower stiffness, lower strength and better thermal insulation properties than the material of the sidewalls 11a, 11b, e.g., with air, insulating gas, polystyrene, polystyrene foam, sheep wool, glass wool or aerogel.

In Fig. 2, the body 10 is provided with two opposite removable sidewalls 11 for easier access to the interior of the body 10 from two sides. In an unillustrated embodiment, one of the sidewalls H may be rigid.

In the exemplary embodiment described above, the load cell 4 (Figs. 3, 4) is a modular encapsulated single point strain gauge load cell 4 with four foil strain gauges.

Together with the load cell 4 and the holder 2 in the interior of the housing l,jn the base body and/or on the inner wall 11a of the side wall 11 is mounted at least one heating element 5 for heating the interior of the body 10 to prevent freezing of moving parts 2, 3 mounted in the interior of the body 10 and to maintain the temperature. Together with the heating element a module 8 for regulating the heating element 5 is mounted inside the housing 1. The module 8 is connected by its output to the heating element 5.

A sensor 12 for measuring temperature is mounted on the front part 22 of the arm 2 protruding from the housing 1_. The sensor 2 for measuring temperature is provided with means for digitizing data and is connected by its output to the input of the computing unit 61 and also to the input of the module 8 for regulating the heating element 5.

On the outer wall of the housing 1 is mounted a sensor 13 for measuring air humidity which is provided with means for digitizing data and is connected by its output to the input of the computing unit 61 and also to the input of the module 8 for regulating the heating element 5.

In another embodiment of the invention, the sensors 12, 13 may be mounted in any other suitable place in the vicinity of the device, outside the interior of the housing 1.

Furthermore, the device for detecting and determining the weight of icing on the power line of electric vehicles is provided with a transmission module 7 mounted in the base body 10 in the interior of the housing 1, e.g., an internet module or another known suitable device for transmitting information through the wall of the housing 1, and for communication with a nearby router (not shown) located outside the interior of the housing 1, e.g., as part of a weather station or as part of a charging station for autonomous electric platforms.

The electronic components described above are connected in the exemplary embodiment of the invention in the following manner. The output of the electric voltage from the load cell 4 is connected to the input of the electric voltage amplifier which is part of the evaluation module 6. The output of the voltage amplifier is connected to the input of the analog signal to the AD converter, which is also part of the evaluation module 6. The output of the digital signal from the AD converter is connected to the input of the computing unit 61_, which is part of the evaluation module 6 and is provided with necessary software. The computing unit 61 is coupled to an internet module 7, so that the data output from the computing unit 61 is connected to the data input of the internet module 7 and the data output from the internet module 7 is connected to the data input of the computing unit 6.

The data outputs from the sensor 12 for measuring the temperature and from the sensor 13 for measuring air humidity are connected to the data input of the computing unit 61, to the data input of the internet module 7 and to the data input of the module 8 for regulating the heating element 5. The data output from the internet module 7 is connected to the data input of the module 8 for regulating the heating element 5. The output of the module 8 for regulating the heating element 5 is connected to the input of the heating element 5.

The above-described device for detecting and determining the weight of icing operates in an exemplary embodiment in such a manner that the icing rising on the measuring member 9, possibly also on the outer part of the holder loads the measuring member 9 and the front part 22 of the holder 2 by its weight and acts, using a lever transmission, on the rear part 23 of the holder 2 with the contact element 21, which loads the strain gauge cell 4 with foil strain gauges. The deformation of the loaded load cell 4 is measured by four active foil strain gauges 43 deformed during loading, which are glued to the surface of the load cell 4 in its cavity 42, are connected into into a Wheatstone bridge and, ideally, all the four strain gauges 43 have the same electric resistance. The foil strain gauges 43 are powered by direct current with constant voltage. When the load cell 4 is loaded, the foil strain gauges 43 convert the deformation of the surface of the load cell 4 on which they are glued into a change in electrical resistance, which is measured as a change in the voltage output from the Wheatstone bridge of the encapsulated strain gauge load cell 4. The signal generated by the strain gauge cell 4 as a change in electrical voltage of the order of mV is fed to an amplifier, where it is amplified, and then fed to a high- resolution AD converter, where it is digitized. The digitized signal is passed on from the output of the AD converter to the computing unit 61, where it is processed by a program for detecting and determining the weight of icing on the traction line into output data which is passed from the computing unit 61 to the transmission module 7, which sends it from the housing 1 of the device to an unillustrated router.

The device is pre-calibrated in a freezing chamber, so that it not only detects the change in the load of the holder 2 by the measuring member 9 with the increasing icing, but also detects the weight of the icing, from which it is possible to determine the average thickness of the icing layer on the measuring member 9_using the value of the size of the surface area of the measuring member 9 which has been pre-stored in the evaluating unit 6.

In addition to the above-described function of detecting and determining the weight of icing on the power line for powering electric vehicles, the invention in the exemplary embodiment also detects a false load, which occurs when the measuring member 9 or the holder 2 is loaded by a body other than icing, e.g., by heavy rain, plants or animals. The data on the temperature from the sensor 12 for measuring the temperature and the data on the air humidity from the sensor 13 for measuring air humidity, or the data on the temperature and air humidity obtained remotely, by means of the transmission module 7, is fed to the computing unit 61, in which it is evaluated by a computer program for detecting false icing, together with the data on the weight of icing obtained by the above procedure. The output data is afterwards transmitted from the computing unit 61 to the transmission module 7, which sends it from the housing 1 of the device to the unillustrated router. Another function of the above-described device for detecting and determining the weight of icing on the power line of electric machines is regulating the heating element 5. The data on the temperature from the sensor 12 for measuring the temperature and the data on the air humidity from the sensor 13 for measuring air humidity, or the data on the temperature and air humidity obtained remotely, by means of the transmission module 7, is fed to the module 8 for regulating the heating element 5, where it is evaluated by a computer program for regulating the temperature in the interior of the housing 1, which generates output data for regulating, switching on and off the heating element.

List of references

1 housing of the device

10 body

11 sidewall

11a inner wall of the sidewall

11b outer wall of the sidewall

110 cavity of the sidewall

2 holder

21 contact element

22 front part of the holder

23 rear part of the holder

24 axis of rotation of the holder

3 bearing

31 bearing hinge

4 load cell

41 working surface

42 cavity of the sensor

43 foil strain gauge

5 heating element

6 evaluation module

61 computing unit

7 transmission module

8 module for regulating the heating element

9 measuring member

12 temperature sensor

13 air humidity sensor