Sampling device for extracting a sample from a plant component guiding a liquid medium and method for

Abstract

The invention relates to a sampling device (1) for extracting a sample from a liquid medium located in a device, comprising a sample receptacle (16) into which the extracted sample can be introduced by means of an input device. In order to achieve a reproducible sampling defined from the device, the feed device has a line arrangement (4) which is provided on the inlet side with a connecting unit (10) which is coupled or can be coupled to a device part (2) of the device in a medium-conducting manner and on the outlet side with a discharge section which is connected or can be connected to a sample receiver (16) in a medium-conducting manner, and a closing device which can be opened and closed is arranged.

Description

[0001] The present invention relates to a sampling device for extracting a sample from a liquid medium located within a device, the sampling device having a sample receiver into which the extracted sample can be introduced via an input device. The present invention also relates to a method for extracting a sample from a liquid medium located within a device component via the sample receiver, the sample being introduced into the sample receiver via the input device. The present invention further relates to the use of such a sample receiving device and the use of this method.

[0002] Such a sample extraction device for extracting a sample from a liquid medium guided in a device, as described in EP 2 405 251 A2, has an input device coupled or couplable to a suitable location on the device, the input device being provided with a receiving device on the outlet side for feeding the sample extracted from the liquid medium in a defined quantity into the receiving device.

[0003] Further sampling devices and methods for extracting a sample from a liquid medium guided in a device, especially for the analysis of biological material, are shown in US 5 902 746 A. In order to form closures at different locations in the pipeline system, the liquid medium can be frozen here, and the closures can be reopened by applying electrical energy for heating.

[0004] The sampling device shown in DE 1 955 988 A is especially configured for sampling liquid metals and for chemical analysis of impurities in a liquid metal melt in a nuclear reactor circuit.

[0005] It is expedient, and even usually necessary, to repeatedly extract samples from a liquid medium guided in a device in order to confirm changes in the properties of the medium by analyzing the samples. Thus, during the operation of a device, such as a chemical reactor, a heat storage or other storage device, which uses molten inorganic salts, nitrates, chloride salts or carbonates with a temperature of 150 °C to 800 °C as the working medium or heat carrier, the long-term stability of the salts and the components in contact therewith can be checked by regularly extracting and analyzing samples from the liquid medium and appropriate measures can be taken. In such a device, extracting a sample with a conventional sampling device is cumbersome, time-consuming, and manually sampling is potentially dangerous. And forgoing sampling, for example forgoing sampling from a device guiding salts, may lead to the inability to detect salt corrosion problems in a timely manner, such as heat-induced decomposition reactions or corrosion reactions. This may also lead to the corrosion of components without being noticed, salt decomposition and thereby lead to unexpected failures of the device or even pose a health hazard.

[0006] The technical problem to be solved by the present invention is to provide a sampling device of the type described at the beginning, by means of which it is possible to automatically extract samples as safely and reproducibly as possible from the continuous operation of a device or its device components (such as pipes, storage tanks or other assemblies), and to provide a corresponding method and use.

[0007] This technical problem is solved for the sampling device by the features of claim 1 and for the method by the features of claim 14. The use of the sampling device is given in claim 17, and the use of the method is given in claim 18.

[0008] It is provided in the sampling device that the input device has a pipeline device, which is provided with a connection unit on the inlet side that is coupled or can be coupled in a medium-introducing manner to a device component of the equipment, and an outlet section that is connected or can be connected in a medium-guiding manner to a sample receiver, and has an openable and closable closing device.

[0009] Through the pipeline device that is coupled in a medium-introducing manner to a device component, the sample receiver that is connected in a medium-guiding manner on the outlet side, and the openable and closable closing device, automatic sample extraction that is harmless to people during the continuous operation of the equipment is realized, thereby realizing suitable repeated and even reproducible sample extraction, especially at relatively high temperatures, such as between 100 °C and 1600 °C, preferably between 150 °C and 800 °C. For example, in the case of molten inorganic salts that are used as a working medium or a heat carrier in the equipment. The automated sampling constructed in this way can also be used for other liquids, such as corrosive media. Here, the sampling can be precisely performed, controlled, or adjusted by a control device.

[0010] Corresponding advantages are also obtained in the method, where it is provided that the pipeline device of the input device is connected to a device component, and a defined amount of the medium is introduced as a sample through the pipeline device into the sample receiver when the flow channel is opened, and the flow channel is closed after the defined amount in the sample receiver is reached.

[0011] Corresponding advantages are also obtained in the use of the sampling device according to claim 17 and in the use of the method according to claim 18.

[0012] Contributing to precise sampling is that the input device has a pressure-reducing device in the inlet area.

[0013] Furthermore, precise and reproducible, defined sampling is thereby promoted, and the pressure-reducing device has a pipe with a cross-section that is reduced relative to the connection unit or a nozzle section with a part that narrows towards the inlet side.

[0014] The precise controllability or adjustability and even reproducibility of sampling are advantageously additionally promoted thereby, and the pressure-reducing device has a pressure-balancing device or a flow-limiting device arranged after the nozzle section that exists when necessary, especially constructed as a passive fluid valve, such as a Tesla valve.

[0015] Other advantages for quantitative sampling result from the fact that the input device has a laminar flow section, in particular designed as a metering tube (Dosierlanze), where, when designed according to one of claims 2 to 4, the laminar flow section is arranged in the flow direction behind the pressure reducing device.

[0016] Furthermore, advantages for the control or regulation of sampling result from the fact that the closing device can be automated and / or time-controlled according to the size of the sample to be withdrawn and / or the time sequence of sampling.

[0017] The reliable function of the closing device and the structure for protecting the components are obtained in that the closing device, preferably arranged in the outlet area of the input device, has a temperature control device which has a freezing device for forming a closing plug by means of a freezing medium, in particular by means of a freely or forcedly convective freezing medium, for closing, and a heating device for opening which suppresses the convection, in particular by means of an insulator or an air flow suppressor, to eliminate the closing plug.

[0018] For a functionally advantageous structure, the freezing device has a fan which generates a cooling air flow around the pipeline section of the pipeline device, in particular around the laminar flow section.

[0019] Other advantages of the structure are also obtained in that the heating device has an additional heater (Begleitheizung) which actively applies energy and / or operates passively by utilizing the heat of the input medium.

[0020] Measures which are advantageous for the good function and efficiency of the temperature control device are that the temperature control device has a heat conducting unit which is in heat conducting connection with the pipeline device and is in particular provided with heat sinks.

[0021] The precise control and regulation of sampling are also advantageously assisted in that the input device has a differential pressure regulating device corresponding to the pipeline device, the differential pressure regulating device comprising a pressure regulating unit arranged in a bypass pipeline, and the pressure regulating unit realizing differential pressure regulation in particular in the area of the temperature control device.

[0022] The advantageous structure of the sampling device also lies in that the input device is provided on the outlet side with an adjusting device having a sample extraction part and a waste extraction part, the adjusting device comprising an adjusting part supported on a bearing unit, where a sample receiver corresponds to the sample extraction part and a waste receiver corresponds to the waste extraction part. The adjusting part is preferably held on the equipment component by a fixing part.

[0023] An advantageous design of the structure and function also lies in that the adjusting device is designed as a linear table or a rotary table, which also includes a guiding part and a driving unit for adjusting the adjusting part from a stationary position to a waste extraction position or a sample extraction position and back. In the stationary position, the outlet section of the pipeline device is closed. In the waste extraction position, the waste extraction part corresponds to the outlet section of the pipeline device. In the sample extraction position, the sample extraction part corresponds to the outlet section.

[0024] An advantageous design of the method lies in that the flow channel is closed by freezing the medium in a section of the pipeline device to form a sealing plug, and the flow channel is opened by eliminating (or dissolving) the sealing plug by means of heat. It also lies in that, before extracting the sample, at least the waste amount of the medium located in the pipeline device is introduced into the waste receiver in the case of opening and then closing the flow channel.

[0025] The present invention will be further elaborated below with reference to the accompanying drawings according to embodiments. Among them:

[0026] Figure 1 A schematic diagram showing a sampling device of a device component connected to a device

[0027] Figure 2 Showing according to Figure 1 The sampling device, which is additionally provided with a differential pressure regulating device

[0028] Figure 3 A perspective view showing another embodiment of the sampling device

[0029] Figure 4 Showing according to Figure 3 A partially sectional view of the sampling device according to

[0030] Figure 5 Showing according to Figure 3 Another partial view of the sampling device according to

[0031] Figure 1 An embodiment of the sampling device 1 is shown. The sampling device is coupled to a device component 2 of a device (not shown in detail) through a connection unit 10. The device with the device component 2 guides a liquid medium, and the liquid medium usually has a corrosive effect on the components of the device in contact with it. For example, the device is a chemical reactor or a heat storage device or other storage devices, which use molten inorganic salts at relatively high temperatures, such as nitrates, chloride salts or carbonate salts, in the range of, for example, 100 °C to 1600 °C, usually in the range of 150 °C to 800 °C, as working media or heat carriers. The liquid medium is usually under high pressure here, for example, on the order of several bars or dozens of bars.

[0032] The sampling device 1 has an input device which includes a connecting unit 10 and a pipeline device 4 connected thereto. A sample extracted from the liquid medium guided in the device is introduced into the sample receiver 16 through the input device. The pipeline device 4 has a pipe 11 with a reduced cross-section relative to the inlet section of the connecting unit 10 immediately after the connecting unit 10. The pipe leads to the sample receiver 16 via another section of the pipeline device 4 through a pressure balancing device 12 or a flow restrictor, such as a pressure balancing device 12 or a flow restrictor configured as a Tesla valve, and a closing device is arranged in the other section. In the illustrated embodiment, the sample receiver 16 can be alternately assigned to the outlet-provided outlet section of the pipeline device 4 with the waste receiver 15, such as a waste container. A predefined or predetermined amount of the liquid medium extracted from the device can be automatically set by a control device that controls the sampling device 1, especially the closing device, depending on time and / or depending on the amount, in order to obtain a defined sample, for example even under the closed-loop control of a closed-loop control device. Thereby, reproducible sampling can be obtained, for example, at predefined time intervals or depending on events, without endangering the operator and / or without being affected by operation-dependent errors.

[0033] In Figure 1 In the illustrated embodiment, the closing device is particularly constituted by a temperature regulating device 13. Here, in order to close the pipeline device 4, especially in its outlet area, a part of the extracted liquid medium itself is used as a closing element by cooling it below its solidification temperature in a section of the pipeline device 4 through the temperature regulating device 13, so as to form a closing plug by freezing. For this purpose, the temperature regulating device 13 has a cooling device, such as including a blower 132, which generates a cooling air flow around the corresponding pipe section guiding the liquid medium. In order to dissipate heat, the pipe section is suitably provided with a heat conducting unit 131 having, for example, heat sinks. The closing plug can save other closing components and avoid corrosion reactions and the resulting functional weakening. In order to introduce the liquid medium conducted for sampling into the sample receiver 16, the blower 132 can be turned off and the heat of the input liquid medium itself can be used as a passive heat source. Alternatively or additionally, the temperature regulating device 13 is provided with a heating device 130 as an auxiliary heating device, which is, for example, configured as an electric heating device, and its heat is input to the pipe section with the closing plug through the heat conducting unit 131 when the blower 132 is turned on, and the closing plug is thereby dissolved or melted, so that the liquid medium reaches the sample receiver 16 in a regulated manner. The amount of the liquid medium guided through the pipeline device 4, especially its relevant pipe section, and the cooling power and heating energy of the temperature regulating device 13 are coordinated with each other here, so that under the control or regulation of the closing device constituted in this way by the control device, the relevant amount of the liquid medium enters the sample receiver 16 as a sample.

[0034] As Figure 1As further shown and described above, the sampling device 1 also has a waste receiver 15 which, by means of an adjusting device 3, can replace the sample receiver 16 at the outlet of the pipeline device 4 in the waste extraction function. Thereby, at least one part of the medium located in the pipeline device 4 that is not persuasive for the sample or its analysis can be separated before sampling. For this purpose, a closing device, such as a temperature control device 13, can be controlled when heat is input so that the pipeline device 4 is opened by dissolving the closing plug in order to discharge the waste quantity of the liquid medium into the waste receiver 15. Subsequently, the sample receiver 16 can be reassigned to the outlet of the pipeline device 4 in order to extract the relevant (current) quantity of the liquid medium from the device as a sample. In order to move the waste receiver 15 out of the waste extraction position and adjust the sample receiver 16 into the sample extraction position, the pipeline device 4 can be closed under the operation of the closing device, for example by forming a closing plug.

[0035] Figure 1 The sampling device 1 shown works, for example, as follows: Before sampling, all controllable components, in particular the closing device or the temperature control device 13, are switched off. The heat-conducting unit 131, in particular the heat sink, is dimensioned such that free convection is sufficient to dissipate the heat from the hot device part 2 and to keep the solidified closing plug or salt plug in the region of the pipeline device 4 with the heat-conducting unit 131. The waste receiver 15 together with the waste container is assigned to the discharge section or arranged below the outlet.

[0036] For a flushing process with waste extraction function, both the fan 132 and the heat source of the heating device 130 are switched off. The heating device 130 is dimensioned such that it can quickly melt the closing plug in the relevant section of the pipeline device 4 despite the additional cooling effect of the fan 132. If the closing plug melts, the medium or the liquid salt flows into the waste receiver with the waste container. The medium flow or salt flow is regulated by a pressure equalizing device 12 or a flow limiter, in particular constructed as a Tesla valve.

[0037] For sampling, the heating device 130 can now be briefly switched off, the temperature in the relevant section of the pipeline device 4 thus drops sharply due to the strong cooling effect caused by the fan 132, and a closing plug forms again. The medium flow is now briefly interrupted. The sample receiver 16 with the sample container is now assigned to the discharge section or moved below its outlet. The heating device 130 with the heat source is switched on again and the closing plug melts again. The medium now flows into the sample receiver 16 regulated by the pressure equalizing device 12 or the flow limiter, in particular the Tesla valve. The interruption of the medium flow can also be omitted.

[0038] After sampling, the heating device 130 is first switched off. The fan 132 remains switched on initially to reduce the temperature in the relevant section of the pipeline device 4 as quickly as possible. A closing plug forms again. Then the fan 132 is also switched off.

[0039] In this way, it is possible to advantageously and reproducibly extract, for example, a molten salt as a liquid medium from relevant devices, such as heat storage devices or salt guiding reactors in the field of solar thermal power plants, such as endothermic or exothermic reactors, in a defined manner.

[0040] In Figure 2 the illustrated embodiment, compared to the design according to Figure 1 an additional differential pressure regulating device 17 is provided, which has a bypass with a pressure regulating unit 170 to the pipeline device 4. Here, the bypass is connected on the inlet side to the outlet region of the pipeline device 4 and the region of the waste receiver 15 or the sample receiver 16 arranged there, and returns to a region upstream of the temperature regulating device 13 or the pressure balancing device 12 in the flow direction, for example, to the pipeline 11, as Figure 2 illustrated. The differential pressure regulating device 17 thus regulates the differential pressure between the internal pressure of the device and the sample chamber from which a sample is extracted from the pipeline device 4, wherein the differential pressure regulation has a self-regulating component. The pressure regulating unit 170 arranged in the bypass is based on, for example, the formation of an air cushion or the use of a flexible membrane. In the embodiment according to Figure 2 when the device pressure is, for example, 20 bar, an outlet pressure of 1 bar is caused in the sample chamber region. Thereby, a reproducible sample can be extracted in a defined and simple manner.

[0041] Figure 3 In the illustrated embodiment, the sampling device 1 is also connected to the device component 2 via a flange connection, and there is an input device with a pipeline device 4, at the outlet section or outlet of which a sample receiver 16 is arranged, which can be alternated with the waste receiver 15. The adjustment between the sample receiver 16 to the sample extraction position and the waste receiver 15 to the waste extraction position is also carried out by the adjustment device 3, wherein the adjustment device 3 is designed as a linear stage in this embodiment. There is also a closing device in the pipeline device 4 in this embodiment, which has a temperature regulating device 13, especially a temperature regulating device of the above structure, for defining the input of a liquid medium as a sample. Before sampling, at least one waste amount present in the pipeline device 4 is discharged into the waste receiver 15 during the flushing process. Here, immediately following the pressure balancing device 12, especially a Tesla valve, a metering tube is installed in the pipeline device, through which a laminar flow section 14 for the conducting liquid medium is formed and the connection to the control slider present in the adjustment device 3 or the adjustment part is achieved, wherein the laminar flow section 14 is closed or opened at the waste extraction position or the sample extraction position by the control slider. In addition to the mechanical closing achieved, the liquid medium, such as a salt flow, can also be effectively cooled, for example, in an opening width of 1 mm to 3 mm to form a closing plug and heated to dissolve.

[0042] As Figure 4As shown, a nozzle section is configured in the inlet region of the pipeline device 4, which continuously narrows, for example, conically, towards the inlet region or the device component 2, and causes an active pressure reduction of the liquid medium from the device component 2 by increasing the pipe cross-section while maintaining the flow rate constant. A connected pressure balancing device 12, such as a Tesla valve, is used for further pressure reduction or balancing of the gas or medium pressure.

[0043] As Figure 5 As shown, the regulating device 3 configured as a linear stage has a guide section 30 and a drive unit 31, which, for example, engages with a rack through a gear to adjust the regulating section of the regulating device 3. The regulating section has: a sample extraction section 32 with a sample receiver 16; a waste extraction section 36 coupled to the waste receiver 15; and a free jet section 33 leading to the waste extraction section 36, through which the waste quantity of the extracted medium can be introduced into the waste receiver 15. In addition, the linear stage can be equipped with a closing section 34 to close the outlet of the pipeline device 4 in the rest position, and can also be equipped with a freezing section 35 to form a sealing plug by freezing the liquid medium in the outlet region of the pipeline device 4. A heating device can also be integrated in the linear stage as an additional heating device for dissolving the sealing plug to extract the liquid medium.

[0044] The pressure balancing device 12, in particular the Tesla valve and the nozzle section 110, are continuously heated, for example, passively by the heat of the liquid medium or the salt circuit and / or actively with additional tracing heating, to avoid the formation of plugs. The laminar flow section 14 or the metering pipe is not heated and is passively cooled from one side by the freezing section 35 in the neutral position (when the freezing section 35 is located below), so that a sealing plug is formed in the laminar flow section or the metering pipe, which blocks the medium flow from the freezing section 35 or the outlet section of the pipeline device 4 when no medium sample is being extracted.

[0045] During sampling, the heating device of the linear stage is switched on and heated to approximately 300 °C in the regions of the free jet section 33 (region 1), the sample extraction section 32 (region 2), and the closing section 34 (region 3). The relevant pipe sections, in particular the laminar flow section 14 or the metering pipe, are heated, and the sealing plug, such as a salt plug, is dissolved by melting. The regulating section of the linear stage moves from the position in region 3 (closing section) to the position in region 1 (free jet section), and the liquid medium flows into the waste receiver 15 or the waste container. After rinsing the sampling device, the linear stage moves to the position in region 2 (sample extraction section), and the rinsing of the sampling device can be determined, for example, based on the weight increase of the waste receiver or the waste container. The sample receiver or the sample container is filled with the relevant quantity of liquid medium or salt. After filling the sample receiver, the linear stage moves to the position of the freezing section (region 4). Simultaneously with the adjustment, the heating of the laminar flow section 14 or the metering pipe by the heating device or the additional heating device is switched off. A sealing plug is formed in the laminar flow section 14.

[0046] The design of the sampling device 1 with a rotary table can also be constructed by means of corresponding functions and similar components such as linear tables.

[0047] The sampling device 1 can be applied to any fluid technology equipment for processing liquid and corrosive media, especially at temperatures above 100 °C, preferably above 150 °C. Sampling for subsequent analysis can be carried out automatically during continuous operation, where no operating parameters need to be changed, as might be required for sampling personnel to avoid endangering them. Sampling can be automated, where appropriate control can be achieved by means of regulation technology. Sampling can be carried out selectively at predefined time points, such as at fixed intervals or depending on events, even on weekends or at night. Sampling can be carried out reproducibly in exactly the same way. Due to the built-in pressure regulation, sampling can also be carried out from a pressure-loaded location without endangering personnel.

[0048] The adaptation of the sampling device can be carried out simply corresponding to the equipment or equipment component 2 (such as a pressure-loaded pipeline, container, valve, etc.). Pressure fluctuations in the equipment component are balanced by the sampling device with simple components, where a corresponding pressure reduction or differential pressure regulation between the internal pressure of the equipment and the sample chamber is even carried out during sampling.

[0049] Sampling is carried out from a representative and relevant medium-guiding area in the equipment to avoid extraction from dead volumes or non-representative edge areas. Advantageously, for example, extraction is carried out from a continuous free jet, and especially after flushing the sampling device with the equipment fluid, where the medium flow or salt flow can be interrupted in a controlled manner.

[0050] In the case of freezing the extracted medium, the construction of a closing device by means of the temperature control device 13 avoids leakage and accidental salt outflow, where salt penetration into seals and other gaps is suppressed after sampling.

Claims

1. A sampling device (1) for extracting a sample from a liquid medium located in a device, the sampling device having a sample receiver (16), into which the extracted sample can be introduced via an input device, characterized in that: The input device comprises a pipeline device (4), which is provided with a connecting unit (10) on the inlet side and is coupled or can be coupled to a device component (2) of the device in a medium-conducting manner, and a discharge section on the outlet side and is connected or can be connected to a sample receiver (16) in a medium-conducting manner, and has an openable and closable closure device.

2. The sampling device according to claim 1, characterized in that The inlet device has a pressure relief device in the inlet region.

3. The sampling device according to claim 2, characterized in that The pressure reducing device has a pipe (11) having a reduced cross section relative to a connecting unit (10) or a nozzle portion (110) having a portion narrowing toward an inlet side.

4. The sampling device according to claim 2 or 3, characterized in that: The pressure relief device has a pressure equalization device (12) which is arranged downstream of the nozzle section (11) which may be present and is in particular designed as a passive fluid valve, such as a Tesla valve.

5. The sampling device according to any one of the preceding claims, characterized in that The supply device has a laminar flow section (14), in particular is designed as a metering tube, wherein in the embodiment according to one of claims 2 to 4 the laminar flow section (14) is arranged downstream of the pressure relief device in the flow direction.

6. The sampling device according to any one of the preceding claims, characterized in that The closing device can be automatically controlled in an event-dependent and / or time-dependent manner depending on the size of the sample to be extracted and / or the temporal sequence of the sampling.

7. The sampling device according to any one of the preceding claims, characterized in that The closure device, which is preferably arranged in the outlet area of ​​the input device, has a temperature control device (13), which has a freezing device for closing, which forms a closure plug by a freezing medium, in particular by free or forced convection of the freezing medium, and a heating device for opening, which eliminates the closure plug, in particular by suppressing convection with the help of an insulating body or an air flow suppressor.

8. The sampling device according to claim 7, characterized in that The freezing device has a fan (132) for generating a cooling air flow around a line section of the line device (4), in particular around the laminar flow section (14).

9. The sampling device according to claim 7 or 8, characterized in that: The heating device has an associated heater which actively supplies energy and / or operates passively by utilizing the heat of the input medium.

10. The sampling device according to any one of claims 7 to 9, characterized in that The temperature control device (13) comprises a heat conducting unit (131) which is heat-conductingly connected to the pipeline device (4) and is particularly provided with heat sinks (5).

11. The sampling device according to any one of the preceding claims, characterized in that The input device has a differential pressure regulating device (17) corresponding to the pipeline device (4), and the differential pressure regulating device includes a pressure regulating unit (170) arranged in a bypass pipeline (171).

12. The sampling device according to any one of the preceding claims, characterized in that The input device is provided with an adjustment device (3) having a sample extraction part (32) and a waste extraction part (36) on the outlet side, wherein the adjustment device comprises an adjustment part supported on a carrying unit, wherein the sample receiver (16) corresponds to the sample extraction part (32), and the waste receiver (15) corresponds to the waste extraction part (36).

13. The sampling device according to claim 12, characterized in that The adjusting device (3) is designed as a linear stage or a rotating stage, and further comprises a guide part (30) and a drive unit (31) for adjusting the adjusting part from a static position to a waste extraction position or a sample extraction position and returning from the waste extraction position or the sample extraction position to a static position, wherein the outlet section of the pipeline device is closed in the static position, the waste extraction part (36) corresponds to the outlet section of the pipeline device (4) in the waste extraction position, and the sample extraction part (32) corresponds to the outlet section (4) in the sample extraction position.

14. A method for extracting a sample from a liquid medium located in a device component (2) via a sample receiver (16), the sample being introduced into the sample receiver via an input device, characterized in that The conduit device (4) of the inlet device is connected to the system component (2), and a defined amount of a medium as a sample is introduced into a sample receiver (16) through the conduit device (4) with an open flow channel, and the flow channel is closed after the defined amount in the sample receiver (16) is reached.

15. The method according to claim 14, characterized in that The flow channel is closed by freezing the medium in a section of the pipeline arrangement (4) to form a sealing plug, and the flow channel is opened by removing the sealing plug by means of heat.

16. The method according to claim 14 or 15, characterized in that Before the sample is taken, at least a waste amount of the medium located in the line device (4) is directed into a waste receptacle (15) by opening and then closing the flow channel.

17. Use of a sampling device according to any one of claims 1 to 13 for extracting samples from a chemical reactor or a storage device, such as a thermal storage device, wherein: The liquid medium is a corrosive, in particular saline, fluid at temperatures above room temperature, in particular in the range between 100° C. and 1600° C.

18. Use of the method according to any one of claims 14 to 16 for extracting a sample from a liquid medium located in a device part (2) of a device, wherein: The device is a chemical reactor or a reservoir, such as a heat reservoir, and the liquid medium is a corrosive, in particular a saline fluid, especially at a temperature above room temperature, in particular in the range between 100° C. and 1600° C.

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