Sampling probe head and measuring device comprising sampling probe with this head

Abstract

FIELD: measuring devices.SUBSTANCE: sampling probe head is disclosed, which is a cylindrical part with a cutout in the side wall of the cylinder at the far end from the base, intended for connection with the sampling probe nozzle, wherein the cutout has the shape of a right triangle, one leg of which is located on the generatrix of the cylinder, and the other leg is on the guide in the base of the cylinder, wherein on the head along the side of the triangular cutout, corresponding to the leg located on the generatrix of the cylinder, a projection of the wall of the head in the direction of the tangent to the cylinder is formed, wherein the cutout is intended for positioning towards the gas flow for introducing the incoming gas flow into the head. A measuring device for measuring the oxygen and / or carbon monoxide content in a gas stream is also disclosed.EFFECT: enabling stable and reliable supply of the analyzed gas to the sensors, while preventing contaminant particles contained in the gas from reaching the sensors.8 cl, 5 dwg

Description

[0001] Technical field

[0002] The present invention relates to measuring devices for measuring the content of oxygen and / or carbon monoxide in a gas flow and, more particularly, to a sampling probe head and a measuring device comprising a sampling probe with said head.

[0003] Prior Art

[0004] Currently, to improve the efficiency of industrial processes involving fuel combustion, fuel and / or air supply control is widely used based on the oxygen and / or carbon monoxide (carbon monoxide) content of flue gases, measured by gas analyzers. In industrial installations, stationary gas analyzers are used to measure the oxygen and / or carbon monoxide content of flue gases. These gas analyzers can be either forced-flow analyzers, in which the analyzed gas is forced from the ambient air to the sensor, for example, using a manual or electric pump, or diffusion-flow analyzers, in which the analyzed gas is supplied to the sensor from the ambient air by diffusion, i.e., without the formation of a forced flow.

[0005] The oxygen and / or carbon monoxide sensor can be located directly in the measurement zone (e.g., in the flue gas duct) or remotely. For a remote sensor located outside the duct, sampling is typically accomplished using a sampling probe. To prevent contamination of the sensor's sensing element by contaminants (dust, soot, etc.) contained in the flue gases, a filter (metal, ceramic, etc.) is installed in the sampling line upstream of the sensor. To reduce the likelihood of contaminant particles entering the filter, a protective screen (deflection plate) of a semicircular or angular shape is installed in front of it (in the upstream direction relative to the flue gas flow) (see, for example, documents DE 102008007317 A1, DE 102008007316 A1, CN 218098990 U, KR 20200043136 A, etc.). The protective screen deflects the flue gas flow along with the contaminant particles to the sides.In this case, due to the vacuum created on the back of the protective screen (which can be optionally amplified by a pump in the sampling line), flue gases with reduced particle content can be drawn into the sampling line toward the sensor. However, this solution does not ensure a stable gas flow to the sensors, as it is highly dependent on the flow velocity of the gases, requires significant pump power at low flow velocities, and creates significant vibration loads on the probe structure at high flow velocities.

[0006] The prior art includes solutions (e.g., EP 0042436 B1) in which the sample suction opening in the sampling probe is positioned counter to the flue gas flow. This embodiment ensures a simpler, more stable, and more reliable flow of the sample gas to the sensor. However, contaminants can still easily enter the sampling line and either quickly clog the filter (if present) or settle on the sensor's sensing element, reducing measurement accuracy.

[0007] Therefore, there is a need in the prior art to develop a measuring device for measuring the content of oxygen and / or carbon monoxide in a gas flow that does not have the above-mentioned disadvantages.

[0008] Brief summary of the invention

[0009] The present invention is directed to solving at least some of the above problems.

[0010] In accordance with the first aspect of the present invention, a sampling probe head is proposed, which is a cylindrical part with a cutout in the side wall of the cylinder at the distal end from the base, intended for connection with the nozzle of the sampling probe, wherein the cutout has the shape of a right triangle, one leg of which is located on the generatrix of the cylinder, and the other leg is on the guide in the base of the cylinder, wherein on the head along the side of the triangular cutout, corresponding to the leg located on the generatrix of the cylinder, a protrusion of the wall of the head in the direction of the tangent to the cylinder is formed, wherein the cutout is intended for positioning towards the gas flow for introducing the incoming gas flow into the head.

[0011] According to one embodiment, the end of the head is made open.

[0012] According to another embodiment of the head, the projection of the wall of the head is intended to be positioned substantially parallel to the gas flow.

[0013] According to a second aspect of the present invention, there is provided a measuring device for measuring the content of oxygen and / or carbon monoxide in a gas stream, comprising:

[0014] - sensor(s) for measuring oxygen and / or carbon monoxide content;

[0015] - a mounting means for installing a measuring device externally on the wall of a pipeline through which a gas flow is carried, with a chamber fixed to the mounting means for accommodating the sensor(s);

[0016] - a sampling probe including a nozzle connected to a mounting means and containing a channel for feeding gas into a chamber to a sensor(s), and a head according to the present invention, mounted on the nozzle and ensuring the capture of flowing gas and its transfer into the nozzle;

[0017] - a housing located outside the pipeline and connected to a chamber for accommodating the sensor(s), containing a control unit configured to receive readings from the sensor(s).

[0018] According to one embodiment, the measuring device further comprises a pump configured to create a vacuum in the nozzle channel for pumping gas from the head to the sensor(s).

[0019] According to another embodiment of the measuring device, the housing is connected to the chamber for accommodating sensors by means of a rotating hinge that allows the housing to be rotated to access the sensor(s) in the chamber.

[0020] According to another embodiment of the measuring device, the mounting means is a mounting flange.

[0021] According to another embodiment, the measuring device is intended to be installed on a pipeline such that the sampling probe is positioned perpendicular to the gas flow or at an angle to the gas flow, ensuring that gas enters the gas supply channel to the sensor(s).

[0022] The present invention enables the gas to be analyzed to be supplied to the sensors stably and reliably, while preventing contaminants contained in the gas from reaching the sensors, which improves the reliability of the measuring device and ensures the specified accuracy of oxygen and carbon monoxide measurements throughout the entire service life of the sensors and the stable operation of the fuel combustion plant, eliminating unnecessary shutdowns of the fuel combustion plant for cleaning and maintenance of the sensors.

[0023] Brief description of drawings

[0024] The invention is further explained by a description of preferred embodiments of the invention with reference to the accompanying drawings, in which:

[0025] Fig. 1 schematically illustrates a measuring device according to the present invention.

[0026] Fig. 2a-2b schematically depict the oxygen sensor and the carbon monoxide sensor.

[0027] Fig. 3 shows a sampling probe head according to an exemplary embodiment of the present invention.

[0028] Fig. 4 shows a sampling probe head according to an alternative embodiment of the present invention.

[0029] Fig. 5 shows a sampling probe head according to an alternative embodiment of the present invention.

[0030] Description of preferred embodiments of the invention

[0031] The embodiments are not limited to the embodiments described herein; other embodiments of the invention that do not go beyond the spirit and scope of the present invention will become apparent to those skilled in the art based on the information provided in the description and knowledge of the prior art.

[0032] According to the present invention, a measuring device is provided for measuring the content of oxygen O2 and / or carbon monoxide CO in a gas stream. The gas may be at least one of the following:

[0033] 1. Flue gases from furnaces, boilers and other similar equipment;

[0034] 2. Technological non-flammable gases (air, nitrogen, etc.).

[0035] Next, a measuring device (1) according to an exemplary embodiment of the present invention will be described with reference to Figs. 1-5. The measuring device (1) generally includes:

[0036] - sensor(s) (2, 3) for measuring the content of oxygen and / or carbon monoxide in the gas flow;

[0037] - mounting means (4) for installing a measuring device externally on the wall of a pipeline (5) through which a gas flow flows, with a chamber (6) fixed to the mounting means for accommodating the sensor(s);

[0038] - a sampling probe (7) including a branch pipe (8) connected to a mounting means (4) and containing a channel for feeding the monitored gas into a chamber (6) to a sensor(s), and a head (tip) (9) installed on the branch pipe and ensuring the capture of the flowing gas and its transfer to the branch pipe (8), wherein the sampling probe (7) is located in the pipeline (5) perpendicularly or at some angle to the direction of the gas flow;

[0039] - filter (12), installed in the head;

[0040] - a housing (10) located outside the pipeline and connected to a chamber (6) for placing the sensor(s) on the side opposite from the mounting means (4), containing a control unit (11) with an input-output interface, configured to receive readings from the sensor(s) (2, 3).

[0041] The housing (10) is connected to the sensor chamber (6) by means of a rotating hinge, which allows the housing (10) to be rotated to access the sensor(s) (2, 3) in the chamber (6). This significantly facilitates maintenance of the measuring device (1) and replacement of the sensors (2, 3).

[0042] The measuring device (1) is mounted by means of a mounting means (4) on a pipeline (5) through which flue gases are discharged from a fuel combustion plant operating on gaseous, liquid or solid fuel. In the exemplary embodiment shown in Fig. 1, the mounting means (4) is a mounting flange. Alternatively, any other mounting means known in the art may be used.

[0043] The measuring device (1) is installed on the pipeline (5) in such a way that the sampling probe (7) is positioned perpendicular to the flue gas flow or at an angle to the flue gas flow, ensuring that flue gases enter the channel for supplying the measured gas to the sensor(s) (2, 3).

[0044] The sampling probe (7) is most often made of metal, with the choice of metal primarily depending on the physical and chemical properties of the sample being collected. Specifically, stainless steel or chromium steel are used to protect against corrosion in the presence of oxidizing gases. At high temperatures (over 1000°C), ceramic probes can be used.

[0045] The measuring device (1) optionally includes a pump (or ejector) configured to create a vacuum in the nozzle channel (8) for pumping gas from the head (9) to the sensor(s) (2, 3). This increases the efficiency and reliability of gas sampling from the pipeline (5). The pump capacity must be sufficient to supply all sensors with the required flows, as well as provide excess flow (10% of the required flow). After pumping the gas sample through the sensors, the gas is returned to the pipeline (5).

[0046] The sensors (2, 3) for measuring the oxygen and / or carbon monoxide content may be, for example, one of the following: electrochemical, thermal catalytic, thermal conductometric, paramagnetic, infrared, semiconductor sensor, etc.

[0047] In an exemplary embodiment, the sensor (2) for measuring the oxygen content is an electrochemical sensor based on zirconium oxide.

[0048] An electrochemical method for determining the oxygen content (O2) using a cell with porous platinum electrodes and yttria-stabilized zirconium oxide deposited on its inner and outer walls allows for the determination of excess oxygen in gases. When the cell is heated to above 600°C, its walls become permeable to oxygen ions. Vacant sites in the crystal lattice allow oxygen ions to migrate, so the cell acts as a solid electrolyte conducting oxygen ions.

[0049] Platinum electrodes on each side of the cell provide a catalytic surface for the reversible conversion of oxygen molecules into ions. Oxygen molecules on the side of the cell with a high-oxygen reference gas accept electrons, turning into ions that enter the electrolyte. Simultaneously, oxygen ions on the other electrode release electrons and leave the electrode surface as oxygen molecules.

[0050] If the oxygen molecule concentrations differ on different sides of the cell, oxygen ions migrate from the side with a higher concentration to the side with a lower concentration. The resulting ion flow disrupts the electron balance and, as a result, creates a potential difference between the electrodes, which is a function of the cell temperature and the ratio of the oxygen partial pressures on the different sides of the cell.

[0051] The oxygen flow can be increased using an electronic pump with two electrodes, between which a current flows (Ip, the so-called “pumping current”), which provides an additional gradient of partial oxygen pressure outside and inside the sensor.

[0052] The potential difference at the output as a function of temperature and oxygen content in the sample and in the calibration gas is calculated using the Nernst formula:

[0053] ,

[0054] where – potential difference at the output, – universal gas constant, – absolute temperature, – Faraday constant, – partial pressure of O2 in the calibration gas, – partial pressure of O2 in the process exhaust gas.

[0055] Fig. 2a schematically shows a sensor (2) for measuring oxygen content in accordance with the present invention, including: a sensor housing (21), a platinum electrode (22) with a membrane (23) made of zirconium oxide, a heater (24) with conductors (25) for its power supply, measuring electrodes (26) of the sensitive element of the sensor, an insulator (27) for isolating the conductors (25) of the heater from the measuring electrodes (26), an electronic pump (28) with conductors (29) for its power supply.

[0056] In an exemplary embodiment, the sensor (3) for measuring the carbon monoxide content is also an electrochemical sensor. The operating principle is similar to the sensor for measuring oxygen described above. Fig. 2b schematically shows a sensor (3) for measuring the carbon monoxide content in accordance with the present invention, including: a sensor housing (31), a platinum electrode (32) with a zirconium oxide membrane (33), a heater (34) with conductors (35) for powering it, measuring electrodes (36) of the sensor's sensing element, an insulator (37) for insulating the conductors (35) of the heater from the measuring electrodes (36).

[0057] In an alternative embodiment of the invention, the sensor (3) for measuring the carbon monoxide content is a catalytic sensor.

[0058] Catalytic thermal sensors operate on the principle of gas oxidation on the surface of a catalyst electrically heated to a temperature of 450-550°C. Oxidation causes the temperature of the sensing element to increase, approximately proportional to the content of the combustible gas being detected. The sensor consists of two sensing elements mounted close together: one is the working element, and the other is a reference element. The working and reference elements are electrically similar; however, the reference element does not change its temperature and, consequently, its electrical resistance when in contact with the gas. The sensing elements are typically connected in a bridge circuit. This compensates for external factors such as pressure, temperature, and ambient humidity within the sensor's operating conditions.

[0059] Sensors located directly in the pipeline are exposed to elevated flue gas temperatures, which negatively impacts their service life. Furthermore, this location complicates maintenance and replacement. To ensure proper operation, the sensor (electrochemical or catalytic) must be heated to a preset temperature (550-650°C) using a built-in heating element. For sensors located directly in the pipeline, the heating element is used only during system startup. After the system reaches its nominal operating mode, the readings of such sensors are adjusted to account for the effect of elevated gas temperature.

[0060] In the present invention, the sensors (2, 3) for measuring the oxygen and / or carbon monoxide content in the gas flow are located outside the gas flow pipeline, which allows for less severe operating conditions and increases their reliability and service life. The gases cool as they flow through the pipe (8) to the sensors (2, 3). By adjusting the length of the pipe (8), it is possible to prevent the gas temperature at the sensors from exceeding the required temperature.

[0061] Optionally, the measuring device (1) includes a pressure sensor and / or a gas temperature sensor, also located in the chamber (6).

[0062] To direct the measured gas from the pipeline (5) to the sensors (2, 3), a head (9) is installed on the nozzle (8) of the sampling probe (7). The head (9), in accordance with the present invention, includes an opening located opposite the flow of flue gases. This facilitates the entry of flue gases into the sampling probe and then to the sensors. However, with this arrangement, pollutants contained in the flue gases also freely enter the sampling probe. In this case, the filter (12) can quickly become clogged with contaminants.

[0063] In order to reduce the amount of contaminants entering the sampling probe (7) and reaching the filter (12), in accordance with an exemplary embodiment of the present invention, the head (9) includes two coaxial cylindrical elements located with a gap one inside the other (see Fig. 3), wherein in each cylindrical element a longitudinal opening (slot) is formed for the gas flow and said openings of the cylindrical elements are offset relative to each other in the circumferential direction to change the direction of the gas flow in the head. The opening X in the outer cylindrical element is located towards the flow and is rotated relative to the flow axis, ensuring the introduction of the oncoming gas flow with contaminant particles into the gap between the cylindrical elements of the head. Then, from said gap, the gas with a swirl enters through the opening Z into the inner cylindrical element.The head (9) protects the filter (12) from mechanical impurities in the gas flow, which, having a greater centrifugal force, are pressed against the walls of the outer cylinder and are retained therein, and the gas being tested, purified from the said impurities, enters the inner cylindrical element through the opening Z and then through the filter (12) into the channel of the branch pipe (8). In this way, the cyclone filtration effect is ensured. The effect is noticeable in a wide range of the angle between the location of the opening X and the opening Z. In a preferred embodiment of the present invention, the opening Z in the inner cylindrical element is offset in the circumferential direction relative to the opening X in the outer cylindrical element in such a way as to provide the greatest possible path for the gas to pass through the circular gap (space) between the cylindrical elements for the separation of contaminant particles, while avoiding the gas from the opening X directly entering the opening Z.However, the position of the Z hole in the circumferential direction in the inner cylindrical element may be shifted depending on the required characteristics of the sampling probe.

[0064] In Fig. 3, the opening Z in the inner cylindrical element has a size similar to (or equal to) the size of the opening X in the outer cylindrical element and its position is aligned in the longitudinal direction of the head with the position of said opening X. However, in an alternative embodiment, the size and position of the opening Z in the longitudinal direction may differ. For example, the opening Z may be offset in the longitudinal direction toward the base intended for connection with the nozzle (8) to increase the gas flow path in the circular gap between the cylindrical elements.

[0065] The end of the head is covered with a lid, but the end cover of the head is not shown in Fig. 3. The filter (12) has a cylindrical shape.

[0066] The flue cap and filter can be periodically cleaned of accumulated contaminants by back-flushing (e.g., with compressed air) from the flue pipe. Dust and dirt gradually accumulate at the bottom of the flue cap. When the operator suddenly increases the ejector pressure, the air pushes the contaminants back through the gas inlet and back into the flue.

[0067] In an alternative embodiment of the present invention, the head includes two coaxial cylindrical elements (see Fig. 4) located with a gap one inside the other, wherein the outer cylindrical element has two longitudinal openings (slots) X and Y, and the inner cylindrical element has one longitudinal opening Z, offset relative to the opening X in the circumferential direction to change the direction of the gas flow in the head. The first opening X in the outer cylindrical element is located towards the flow and is rotated relative to the flow axis, providing the introduction of an oncoming gas flow with polluting particles into the gap (space) between the cylindrical elements of the head.The second opening Y in the outer element is offset circumferentially relative to the first opening X in the direction of the gas flow and offset longitudinally toward the base, intended for connection with the nozzle (8), thereby ensuring the passage of a portion of the gases in the gap between the cylindrical elements of the tip and their subsequent removal into the passing flue gas stream. Due to the difference in pressure between the incoming flow and the outgoing flow, and the specific location of these openings, continuous swirling of the gas flowing inside the tip is ensured. At the same time, mechanical impurities contained in the flowing gas, having a large mass and, therefore, inertia, move along a trajectory in the space between the outer and inner cylinders, located closer to the inner wall of the outer cylinder, and are discharged from the tip along with a portion of the gas through the second opening Y in the outer element.To draw gas into the nozzle channel, the internal cylindrical element contains a Z-shaped opening, through which gas purified from mechanical impurities enters. This ensures a cyclonic filtration effect. The end cap of the nozzle and the filter installed in the nozzle are not shown in Fig. 4. The filter is cylindrical.

[0068] In Fig. 4, the opening Z in the inner cylindrical element has a size similar to (or equal to) the size of the first opening X in the outer cylindrical element, and its position is aligned in the longitudinal direction of the head with the position of said opening X. However, in an alternative embodiment, the size and position of the opening Z in the longitudinal direction may differ. For example, the opening Z may be offset in the longitudinal direction toward the base intended for connection with the nozzle (8) in order to increase the gas flow path in the circular gap between the cylindrical elements. Alternatively, the opening Z may have a length up to such that it overlaps the opening X and the opening Y.

[0069] The head and filter can be periodically cleaned of deposited contaminants by back-flushing (e.g. with compressed air) from the nozzle, removing the contaminants back into the flue gas pipe (5) through the Y-port.

[0070] In yet another alternative embodiment of the present invention, the tip (9) is a cylindrical part with a cutout (slot) in the side wall of the cylinder at the end far from the base, intended for connection with the nozzle (8), wherein the cutout has the shape of a right triangle, one leg of which is located on the generatrix of the cylinder, and the other leg is on the guide in the base of the cylinder (see Fig. 5). In this case, along the side of the triangular cutout, corresponding to the leg located on the generatrix of the cylinder, a protrusion of the tip wall is formed in the direction of the tangent to the cylinder. The tip is placed in the pipeline so that the protrusion of the tip wall is directed substantially parallel to the flow of flue gases, and the cutout is located towards the flow and provides a coaxial entry of gas (with swirl) into the tip, but with different speeds along the cutout.Mechanical impurities, having greater centrifugal force, are pressed against the walls of the head and retained there. The gas being analyzed, purified of these impurities, flows from the central low-pressure region into the internal channel of the nozzle (8), leading to the sensors (2, 3). This ensures the cyclone filtration effect.

[0071] In Fig. 5, a triangular cutout in a cylinder is depicted with a hypotenuse in the form of a straight segment. It is worth noting that in an alternative embodiment, the triangular cutout may have a hypotenuse in the form of a curve (arc) concave toward the opposite corner of the triangle (or in the opposite direction).

[0072] This probe head can be used, for example, in pyrolysis furnaces, where flue gases reach extremely high temperatures (above 1100°C), and can optionally be used without a filter. The end of the probe head is open, and the probe head can be periodically cleaned of accumulated contaminants by back-flushing (e.g., with compressed air) from the nozzle, flushing the contaminants back into the flue gas duct (5). Alternatively, the probe can be periodically removed for inspection and cleaning.

[0073] The design of the head, the shape and location of the cutout (or hole) in the head towards the gas flow in the present invention ensures the supply of the required flow of the measured gas to the sensors with its preliminary cleaning by means of cyclone filtration and subsequent cleaning by means of installed filters (if any).

[0074] Depending on the operating conditions, metal filters, ceramic filters, etc. can be used in the head.

[0075] The filter (12) installed in the head may be a coarse filter (primary filter) made, for example, of a suitable alloy (such as special stainless steel), borosilicate quartz, ceramics, or other suitable material. In this case, the measuring system (1) additionally includes a fine filter (secondary filter) located between the primary filter and the sensors (2, 3). Suitable materials for the fine filter include, for example, polytetrafluoroethylene (PTFE) or borosilicate quartz.

[0076] Furthermore, the present invention makes it possible to stably and reliably supply the analyzed gas to the sensors while preventing contaminants contained in the gas from reaching the sensors.

[0077] This head design improves the reliability of the measuring device, ensures the specified accuracy of oxygen and carbon monoxide measurements throughout the entire service life of the sensors and stable operation of the fuel combustion plant, eliminating unnecessary shutdowns of the fuel combustion plant for cleaning and maintenance of the sensors.

[0078] The present invention can be applied in fuel combustion installations in the electric power industry (CHP, etc.), chemical industry, oil refining (oil refineries), etc.

[0079] Although exemplary embodiments have been described in detail and shown in the accompanying drawings, it should be understood that such embodiments are illustrative only and are not intended to limit the broader invention and that the present invention should not be limited to the particular arrangements and structures shown and described, since various other modifications may be apparent to those skilled in the art.

Claims

1. The head (9) of the sampling probe (7), which is a cylindrical part with a cutout in the side wall of the cylinder at the far end from the base, intended for connection with the branch pipe (8) of the sampling probe (7), wherein the cutout has the shape of a right triangle, one leg of which is located on the generatrix of the cylinder, and the other leg is on the guide in the base of the cylinder, wherein on the head along the side of the triangular cutout, corresponding to the leg located on the generatrix of the cylinder, a projection of the wall of the head is formed in the direction of the tangent to the cylinder, wherein the cutout is intended for positioning towards the gas flow for introducing the incoming gas flow into the head.

2. The head according to item 1, in which the end of the head is made open.

3. The head according to claim 1, in which the projection of the head wall is intended to be positioned parallel to the gas flow.

4. A measuring device (1) for measuring the oxygen and / or carbon monoxide content in a gas flow, comprising: - oxygen sensor (2) and / or carbon monoxide sensor (3); - a mounting means (4) for installing a measuring device externally on the wall of a pipeline (5) through which a gas flow flows, with a chamber (6) secured to the mounting means for accommodating an oxygen sensor (2) and / or a carbon monoxide sensor (3); - a sampling probe (7) comprising a pipe (8) connected to the mounting means (4) and containing a channel for feeding gas into the chamber (6) to the oxygen sensor (2) and / or the carbon monoxide sensor (3), and a head (9) according to any one of paragraphs 1-3, installed on the pipe and ensuring the capture of the flowing gas and its transfer into the pipe; - a housing (10) located outside the pipeline and connected to the chamber (6), containing a control unit (11) configured to receive readings from an oxygen sensor (2) and / or a carbon monoxide sensor (3).

5. The measuring device according to claim 4, further comprising a pump configured to create a vacuum in the channel of the pipe (8) for pumping gas from the head (9) to the oxygen sensor (2) and / or the carbon monoxide sensor (3).

6. The measuring device according to claim 4, in which the housing (10) is connected to the chamber (6) by means of a rotating hinge, which allows the housing to be rotated to access the oxygen sensor (2) and / or the carbon monoxide sensor (3) in the chamber (6).

7. The measuring device according to claim 4, wherein the mounting means (4) is a mounting flange.

8. The measuring device according to claim 4, wherein the measuring device (1) is intended to be installed on the pipeline (5) in such a way that the sampling probe (7) is positioned perpendicular to the gas flow or at an angle to the gas flow, ensuring the flow of gas into the channel for supplying gas to the oxygen sensor (2) and / or the carbon monoxide sensor (3).

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