Expansion of the high-pressure test bench to include H2 readiness

Abstract

The invention relates to a method for operating a high-pressure test bench (100) which is configured for testing at least one gas meter (300), in particular a flow gas meter and / or large gas meter, especially for natural gas and / or hydrogen, as well as a high-pressure test bench (100). The invention further relates to a corresponding high-pressure test bench (100).

Description

[0001] The invention relates to a method with the features of the independent method claim, a high-pressure test bench with the features of the independent patent claim relating to a high-pressure test bench, a computer program product with the features of the independent patent claim relating to a computer program product, a computer-readable data carrier with the features of the independent patent claim relating to a computer-readable data carrier, and a control unit with the features of the independent patent claim relating to a control unit.

[0002] Test benches are commonly used to test meters, such as gas meters designed for volumetric flow measurement. These gas meters can be configured as flow meters and / or large-capacity gas meters. They may be installed in a gas distribution network, for example, for natural gas. To test their functionality and / or measurement accuracy, they can be removed and tested on a test bench.

[0003] The current state of the art has its drawbacks. For example, sufficiently accurate measurements may not be possible. Determining deviations or predictable behavior of the gas meter under test can be difficult. Furthermore, the measurement conditions, particularly pressure, temperature, and / or gas composition, may not be monitored or adjusted adequately. Pressure deviations and / or temperature fluctuations can lead to inaccurate measurements. An undetected or delayed pressure drop can also compromise safety, potentially leading to ignition, oxygen displacement, and / or poisoning (of operating personnel). A changing or unsuitable temperature can cause thermal expansion and / or compression of the test gas and / or components. This can distort the measurement, increase wear, and / or reduce safety.Furthermore, the flexibility and / or number of gas meters that can be tested may be reduced. Additionally, test benches may only be usable for individual and / or a small number of different test gases. Existing and / or remaining residues, e.g., from test gas and / or deposits, can distort the measurement, increase wear, and / or reduce safety, especially if this can lead to the unexpected formation of mixtures.

[0004] It is therefore an object of the present invention to overcome at least one of the disadvantages described above, at least partially. In particular, it is an object of the invention to improve the safety, flexibility, accuracy, robustness, controllability, cost, and / or testing speed. One object may be to enable the testing of a wider range of test gases and / or (suitably designed) gas meters.

[0005] The foregoing problem is solved by a method with the features of the independent method claim, a high-pressure test bench with the features of the independent claim relating to a high-pressure test bench, a computer program product with the features of the independent claim relating to a computer program product, a computer-readable data carrier with the features of the independent claim relating to a computer-readable data carrier, and a control unit with the features of the independent claim relating to a control unit. Further features and details of the invention will become apparent from the dependent claims, the description, and the drawings.Features and details described in connection with the method according to the invention naturally also apply in connection with the high-pressure test bench according to the invention and / or in connection with the computer program product according to the invention and / or in connection with the computer-readable data carrier according to the invention and / or in connection with the control unit according to the invention, and vice versa, so that the disclosure relating to the individual aspects of the invention always refers to each other. In particular, advantages described within the first, second, third, fourth and / or fifth aspect also apply to the first, second, third, fourth and / or fifth aspect.

[0006] The above problem is solved according to a first aspect by a method for operating a high-pressure test bench (for a test operation) which is set up for checking at least one gas meter to be tested (external and / or [for testing] installed), in particular a flow gas meter and / or large gas meter, especially for natural gas and / or hydrogen, comprising: - Connecting the high-pressure test bench to an external (or separate) test gas reservoir, in particular a (natural) gas network, a gas cylinder or a gas tank, preferably comprising (pure or only) natural gas or a mixture of natural gas and hydrogen, wherein the test gas reservoir is configured to supply a test gas to the high-pressure test bench, - Filling the high-pressure test bench with the test gas until the pressure in the high-pressure test bench reaches a (defined and / or predetermined) test pressure, - Separating the high-pressure test bench from the test gas reservoir, - Circulating the test gas in the high-pressure test rig by a circulation unit of the high-pressure test rig to set a defined volume flow of test gas which flows through the high-pressure test rig, - Measuring, in particular by the gas meter under test, a volume flow of test gas flowing through the gas meter under test in order to obtain a measurement result, - Comparative measurement, using a comparator, of a volume flow of test gas, which flows through the comparator of the high-pressure test bench in order to obtain a comparative measurement result, - Determine, by means of a control unit, a deviation between the measurement result and the comparison measurement result in order to verify at least one function of the gas meter under test.

[0007] The gas meter to be tested may, for example, be designed to measure a volumetric flow rate in a gas network. For instance, the gas meter (normally in operation) may be installed in a gas network, such as a natural gas network. For this and / or before the testing procedure, the (at least one) gas meter to be tested may be removed from the gas network.

[0008] The gas meter (or at least one) to be tested can then be installed in the high-pressure test rig. The gas meter can be a flow meter, in particular a turbine gas meter and / or an ultrasonic gas meter. Preferably, the gas meter is not part of the high-pressure test rig but is installed in it solely for testing purposes. The high-pressure test rig can be configured for checking and / or measuring the gas meter (to be tested). The functionality of the gas meter can be verified. The high-pressure test rig can be configured for pressures of at least 10 bar, in particular at least 30 bar, preferably at least 45 bar, ideally at least 50 bar, for example between 48 and 52 bar, at which, in particular, circulation, measurement, and / or comparative measurement can be carried out.The high-pressure test rig can include pipelines and / or different pipeline sections, which preferably connect the various components (connected in series) to each other (fluid-tight or fluid-carrying). The components and / or pipeline sections can be aligned, fluid-carrying, and / or mechanically fastened to one another by means of fasteners, e.g., by (reversibly detachable) clamp connections, rivets, and / or welds.The gas chromatograph, the test gas valve, the pre-temperature unit, the hydrogen supply unit, the additional gas chromatograph, the recirculation unit, the temperature control unit, the purge unit, the inlet connection, the outlet connection, the (first, second, third, and / or fourth) reference meter, the pressure sensor, the discharge unit, the gas meter under test, the test gas reservoir, and / or the hydrogen reservoir can all be interconnected (fluid-carrying), for example, via corresponding pipe sections. The high-pressure test rig can preferably be (at least partially) closed and / or O-shaped and / or torus-shaped. In other words, the high-pressure test rig can form a closed circuit (at least temporarily), particularly after separation. The test gas can circulate continuously and / or repeatedly and / or continuously within the high-pressure test rig.Preferably, the mass, volume, pressure, and / or composition of the test gas does not change. Operating the high-pressure test bench can include test operation and / or testing of the (at least one) gas meter under test. The control unit, particularly as described in the fifth aspect, can implement the method, especially by controlling and / or regulating the high-pressure test bench, for example, the relevant components. The method can be, at least partially, computer-implemented. The control unit can control the components, especially sensors and / or actuators (e.g., of the valves), with corresponding control signals. This allows the control unit to perform, control, regulate, and / or initiate (especially all) process steps.

[0009] Connecting the high-pressure test bench to an external (or separate) test gas reservoir, in particular a (natural) gas network, a gas cylinder, or a gas tank, can be achieved by opening the test gas valve. This allows test gas to flow into the high-pressure test bench through the test gas valve. The test gas valve can be opened by a control signal (from the control unit) to an actuator of the test gas valve.

[0010] Filling the high-pressure test bench with the test gas until the pressure in the test bench reaches a (defined and / or predetermined) test pressure can be achieved, in particular, by means of an open test gas valve. A pressure sensor can measure the pressure in the high-pressure test bench (repeatedly and / or continuously) and transmit it to the control unit, particularly via a data connection. When the test pressure reaches, for example, 50 bar, the control unit can initiate the disconnection by means of a control signal. Preferably, the pressure within the high-pressure test bench can be essentially identical (everywhere) after filling. It can also be provided that, before, during, and / or after filling, a further hydrogen reservoir containing hydrogen is connected to the high-pressure test bench, for example (analogous to the test gas reservoir) via a hydrogen supply unit, which can be designed, in particular, as a valve.The gas chromatograph and / or other gas chromatographs can determine the composition of the test gas, in particular the proportions of natural gas (or its composition) and / or hydrogen. This allows a predefined and / or desired mixing ratio to be set, especially by adjusting the test gas valve and / or hydrogen supply unit to feed test gas, natural gas, and / or hydrogen into the high-pressure test bench for a correspondingly longer and / or more frequent time. For this purpose, the control unit can receive the composition data from the gas chromatograph and / or other gas chromatographs and, in particular, control the test gas valve and / or hydrogen supply unit via a control signal (especially an actuator operating the respective valve). It can also be provided that the test gas is repeatedly measured and / or modified.For example, it is conceivable to gradually introduce increasingly larger proportions of hydrogen into the test gas, particularly by adding hydrogen stepwise (more and more, and / or more after each cycle of the process). This allows the gas meter being tested to be checked for different test gas compositions. This can be advantageous so that the gas meter, when it is (later) reinstalled in its intended location, e.g., in a gas network, can reliably and / or accurately measure different gas compositions. The test gas can initially consist solely of natural gas. It can also be designed to include hydrogen. Furthermore, the composition can be modified by adding more test gas or natural gas via the test gas valve.It can also be provided that the composition changes through the addition of hydrogen via the hydrogen supply unit. Preferably, it can be provided that the composition, temperature, volume, and / or pressure of the test gas does not change during circulation, measurement, and / or comparative measurement. This allows for optimization of measurement accuracy.

[0011] Separation can preferably be achieved by closing and / or sealing the test gas valve. This prevents any further test gas from entering or leaving the high-pressure test rig (through the test gas valve). The test gas valve can be closed by a control signal (from the control unit) via a data connection. This allows the test gas valve, and in particular an actuator operating the test gas valve, to be controlled.After separation, the hydrogen supply unit, the further gas chromatograph, the recirculation unit, the temperature control unit, the purging unit, the inlet connection, the outlet connection, the (first, second, third, and / or fourth) comparison counter, the pressure sensor, the discharge unit, and / or the gas meter(s) under test may be connected to each other (in a fluid-carrying manner) to form a closed circuit and / or only the following components: the pressure sensor, the discharge unit, and / or the gas meter(s) under test, for example, via the corresponding (intermediate) pipe sections. The high-pressure test rig may preferably be designed to be closed and / or O-shaped and / or torus-shaped. In other words, the high-pressure test rig can form a closed circuit (at least temporarily), particularly after separation. The test gas may circulate continuously and / or repeatedly and / or continuously within the high-pressure test rig.It may be provided that a (further) shut-off valve is installed between the pre-temperature unit and the hydrogen supply unit, particularly at a test gas injection point, wherein the shut-off valve preferably (completely) seals the supply pipe section containing the gas chromatograph, the test gas valve, and the pre-temperature unit. This prevents any residues from this supply pipe section from being (undesirably) mixed in during circulation, measurement, and / or comparative measurement. This allows the quality and / or composition of the test gas to be kept (more) constant. Preferably, after separation, (only) test gas remains in the high-pressure test bench, particularly in a closed circuit of the high-pressure test bench.

[0012] The circulation of the test gas in the high-pressure test rig by a recirculation unit, in particular by a blower of the high-pressure test rig, can comprise constant and / or continuous and / or repeated recirculation and / or flow through the high-pressure test rig, in particular the closed circuit, by the test gas, preferably in a first flow direction (or alternatively in a second [opposite] flow direction). The high-pressure test rig can be configured to allow flow along a (first) flow direction and / or counterclockwise (in a top view). It can also be provided that, for example during purging, the high-pressure test rig (at least sectionally) is flowed through in a second flow direction (opposite to the first flow direction) and / or clockwise (in a top view).It may be possible to set a defined and / or (spatially and / or temporally) constant volume flow of test gas, in particular by controlling and / or regulating the circulation unit via the control unit (for example, to adjust the rotational speed of the circulation unit). This preferably allows the volume flow of test gas through the (at least one and / or) gas meter under test and the (at least one, first, second, third and / or fourth) reference meter to be essentially identical. This preferably allows for the precise determination of any deviation and / or testing of the gas meter.

[0013] The measurement, especially during the circulation, of a volume flow of test gas which flows through the gas meter to be tested in order to obtain a measurement result, can be carried out in particular by the (to be tested) gas meter(s).

[0014] Accordingly, the measurement result for a volume flow of test gas through the gas meter(s) can be specific. Preferably, the gas meter(s) can be connected to the control unit via a data connection. This allows the measurement result to be transmitted to the control unit via a data connection.

[0015] Comparative measurement, particularly during circulation and / or measurement, of a volumetric flow rate of test gas flowing through the high-pressure test bench's comparator by (at least) a comparator counter, can provide a comparative measurement result that can be specific to the volumetric flow rate of test gas through the comparator counter. Preferably, the comparator counter is connectable (in particular, connected) to the control unit. This allows the comparative measurement result to be transmitted to the control unit via a data connection. Preferably, the measurement and comparative measurement can be performed simultaneously. This reduces (additional) deviations due to changes in volumetric flow rate, temperature, and / or pressure. For example, the measurement and / or comparative measurement can be performed over a predefined measurement period.In particular, a time-dependent trend of the measurement result and / or the comparative measurement result can be determined. This allows not only a one-time determination of a deviation, but can provide a time-dependent trend that can, in particular, reveal any potentially existing (excessive) deviation. The measurement and / or comparative measurement can be averaged over the predefined period (or the corresponding measured values). This allows time-limited fluctuations to be smoothed out and / or the measurement accuracy to be improved.

[0016] Determining the deviation between the measured result and the reference measurement, by a control unit, in order to verify at least one function of the gas meter under test, can be carried out during and / or after completion of the measurement and / or reference measurement. This determination can involve subtracting the measured result from the reference measurement (or vice versa) to identify a deviation. Accordingly, the deviation can, for example, represent a volume flow (or a difference), e.g., 0.01 m³ / h. 3 / s. It may be stipulated that the functionality of the gas meter(s) being tested will be confirmed if the deviation does not exceed a predefined limit (for a volume flow deviation), for example, if the deviation is less than 10 m 3 / s, especially smaller than 1 m 3 / s, for example, less than 0.1 m 3 / s, preferably smaller than 0.01 m 3 / s, especially preferred to be smaller than 0.001 m 3 / s, preferably smaller than 0.0001 m 3 / s, ideally smaller than 0.00001 m 3 / s.

[0017] Within the scope of the invention, it may be advantageous that the circulation, measurement and / or comparative measurement includes tempering, preferably heating, of the test gas by a tempering unit, in particular a heat exchanger.

[0018] Preferably, the temperature can be kept constant during measurement and / or comparison measurement, particularly through continuous temperature control. For example, a predefined temperature can be set by the temperature control unit. For this purpose, the temperature control unit can be connected to the control unit via a data link. This allows the control unit to control and / or regulate the temperature control unit. In particular, the control unit can set a predefined temperature via the temperature control unit. Temperature control can preferably be carried out during circulation, measurement, and / or comparison measurement. This allows the temperature to be kept (as close to) constant as possible, for example at 10°C, 25°C, or 50°C. It can also be provided that temperature control is carried out after separation. This can increase energy efficiency.It is also conceivable that tempering can take place during the filling process. This allows the (especially high) temperature to be reached more quickly. This can speed up the process and / or improve efficiency. The tempering unit can be positioned between the circulation unit and the rinsing unit, and in particular, connected to them via a fluid-carrying connection.

[0019] Within the scope of the invention, it is conceivable that, in particular before connecting, at least one gas meter to be tested, preferably at least two gas meters to be tested connected in series, is installed in the high-pressure test bench.

[0020] At least one, two, three, or four gas meters can be installed, particularly connected in series. Different gas meters to be tested can be arranged and / or mounted sequentially, preferably ensuring that all are subjected to the same volume flow of test gas (e.g., by circulation). This allows multiple gas meters to be tested simultaneously. This can further improve measurement accuracy and / or fault detection (for example, if a reference meter is defective). For instance, depending on the measurement accuracy, a difference, particularly a reduction, in different measured volume flows can indicate a defect, such as a leak.

[0021] Within the scope of the invention, it may be provided that, in particular before connecting and / or after installation, the high-pressure test bench is rinsed by a rinsing unit with a rinsing fluid, in particular a rinsing gas (e.g. nitrogen).

[0022] Flushing can be performed (directly) after installation, before installation, and / or before removal of the gas meter(s). Flushing before installation can prevent contamination of the gas meter. Flushing after installation can prevent contaminants from the gas meter entering the high-pressure test bench. Flushing before and after installation can further improve the quality of measurements and / or comparison measurements and / or minimize contamination. Flushing before removal can flush out any remaining contaminants, traces of test gas, and / or hydrogen, especially before the gas meter is reinstalled (in its original location). During flushing, the system may be configured to remove the flushing fluid from the high-pressure test bench via the discharge unit. This ensures the reliable removal of contaminants, which may include air, oxygen, and / or other gases.Contaminants can also include solids, such as dirt, which may be adhesively attached to and / or inside the gas meter and / or the high-pressure test bench. These can be flushed out.

[0023] It is also conceivable that, particularly before circulating and / or measuring, an adjustment, in particular by a control unit, of one of at least two, in particular parallel connected, comparison counters is carried out, wherein the at least two comparison counters are set up and / or optimized for measuring and / or comparing different volume flows, and in particular are arranged between a comparison counter inlet valve and a comparison counter outlet valve.

[0024] Preferably, at least one comparator meter is provided. Preferably, at least two or more comparator meters are provided. This allows for different comparator meters with different measurement accuracy, particularly depending on the volumetric flow rate. For example, a first comparator meter can be used for optimized measurement accuracy at a volumetric flow rate (through the comparator meter) of approximately 4000 m³ / h. 3 / h. For example, a second comparison meter can be set up for optimized measurement accuracy at a volume flow rate (through the comparison meter) of approximately 1600 m³ / h. 3 / h. For example, a third reference meter can be set up for optimized measurement accuracy at a volume flow rate (through the reference meter) of approximately 250 m³ / h. 3 / h. For example, a fourth comparison meter can be set up for optimized measurement accuracy at a volume flow rate (through the comparison meter) of approximately 65 m³ / h.3The system can be configured for / h. This allows the deviation to be optimized for different volume flows, particularly for individual measurements and comparison measurements, and provides improved accuracy. The first, second, third, and / or fourth comparison counter can be configured to determine and / or provide the comparison measurement result. The first, second, third, and / or fourth comparison counter can be connected to the control unit via a data link. This allows the comparison measurement result, especially during comparison measurements, to be transmitted to the control unit. The comparison counter inlet valve and / or outlet valve can be configured as a three-way valve (for two comparison counters), a four-way valve (for three comparison counters), or a five-way valve (for four comparison counters), depending on the number of comparison counters.It can also be provided that an additional connection is provided on each of the comparison counter inlet valves and / or comparison counter outlet valves, which preferably provides functionality as a multi-function valve. For example, the additional connection can enable flushing (of the comparison counter only). The comparison counter inlet valve and / or comparison counter outlet valve can each be connected to the control unit via a data link, allowing the control unit to adjust the comparison counter inlet valve and / or comparison counter outlet valve via a control signal (preferably of the same type), so that advantageously (only) the first, second, third, and / or fourth comparison counters are fluid-carrying connected to the high-pressure test bench or the other components.In other words, the first, second, third, and / or fourth reference flow meter (or a combination thereof) can be selectively used to conduct the test gas. Conducting the gas through only one reference flow meter can result in a (essentially) uniform flow rate within the high-pressure test rig, which can improve measurement accuracy. The other (unused) reference flow meters can then be deactivated.

[0025] The valves used, in particular the comparison meter inlet valve, the comparison meter outlet valve, the test gas valve, the dispensing unit, the hydrogen supply unit, and / or the purging unit (as well as the other components), can be hydraulically, pneumatically and / or (electro-)mechanically designed and / or controllable.

[0026] It is also conceivable that the circulation, in particular the measuring and / or comparative measuring, is carried out by setting at least two different (pre-)defined volume flows (e.g. in the sense of a measuring procedure), whereby a measurement curve is obtained in particular by repeated measuring and a comparison curve by repeated comparative measuring, whereby the determination is carried out depending on the measurement curve and the comparison measurement curve.

[0027] Preferably, the control unit can control the circulation unit to set the (predefined) flow rates. Depending on the predefined flow rate, the control unit can preferably select one, in particular a first, second, third, and / or fourth, comparator meter, which is preferably optimized for the predefined flow rate. For example, a first comparator meter can be selected for optimized measurement accuracy at a flow rate (through the comparator meter) of approximately 4000 m³ / h. 3 / h should be set up, therefore this can be adjusted if the (predefined) volume flow is greater than 2800 m³ 3 / h. For example, a second comparison meter can be used for optimized measurement accuracy at a volume flow rate (through the comparison meter) of approximately 1600 m³ / h. 3 It should be set up to / h, therefore it can be set if the (predefined) volume flow is less than (or equal to) 2800 m³3 / h is and / or greater than 950 m 3 / h. For example, a third comparison meter can be used for optimized measurement accuracy at a volume flow rate (through the comparison meter) of approximately 250 m³ / h. 3 It should be set up as / h, therefore it can be set if the (predefined) volume flow is less than (or equal to) 950 m³ / h 3 / h is and / or greater than 150 m 3 / h.

[0028] For example, a fourth reference meter can be used for optimized measurement accuracy at a volume flow rate (through the reference meter) of approximately 65 m³ / h. 3 / h should be set up, therefore this can be adjusted if the (predefined) volume flow is less than 150 m³ 3 / h is, in particular, less than 100 m 3 / h. Preferably, it can be provided that a multitude of volume flows and / or an interval, in particular comprising discrete volume flows, are set by repeating the circulation, measurement, and / or comparative measurement processes, and / or corresponding measurement results and / or comparative measurement results are determined. This allows a measurement curve and / or a comparative measurement curve to be determined. These can be used alternatively or additionally to determine a deviation. A deviation can be determined specifically for a particular volume flow. It can also be provided that deviations for (at least some) of the volume flows can be determined in this way, whereby deviations across all (or some) of the volume flows may indicate a systematic error.It may also be provided that, during (or after) the measurement process, the measurement results, comparison results, and / or deviations, and / or other information such as the measurement time, measurement sequence, installed gas meters to be tested, etc., are stored, particularly in the control unit. This can facilitate troubleshooting. For example, historical data can be used and compared with (currently) measured deviations. This allows the control unit, for example through machine learning, to support and / or take over troubleshooting and / or the detection of deviations.

[0029] The above problem is solved according to a second aspect by a high-pressure test bench according to the invention for testing at least one gas meter to be tested, in particular a flow gas meter and / or large gas meter, especially (configured) for natural gas and / or hydrogen, comprising: - a test gas valve which can be connected to an (external) test gas reservoir in order to supply a test gas to the high-pressure test bench, - a pressure sensor was installed to measure pressure in the high-pressure test bench, - a circulation unit designed to circulate a test gas in (and / or through) the high-pressure test bench (and / or the gas meter(s) to be tested, - a control unit which can be connected to at least one gas meter to be tested via data communication, - a comparison meter designed for comparative measurement of the volume flow rate of test gas, wherein in particular the test gas and / or the (corresponding) volume flow rate flows through the comparison meter, - wherein the high-pressure test bench and / or the control unit is configured to carry out the procedure according to the first aspect.

[0030] The high-pressure test bench can be configured to measure the volumetric flow rate through the gas meter(s) under test. The high-pressure test bench can accommodate the gas meter(s), and / or the gas meter(s) can be arranged (fluid-carrying) within the high-pressure test bench, in particular, they can be (reversibly) secured. The high-pressure test bench can be filled with test gas via the test gas valve. This can be done, in particular, along a (primary) flow direction and / or (in a top view) counterclockwise. A gas chromatograph can be arranged upstream of the test gas valve. A pre-heating unit can be arranged downstream of the test gas valve. The test gas valve and / or the pre-heating unit can be connected, or connectable, to the (closed or closable) circuit of the high-pressure test bench, in particular via a test gas injection point.It may be provided that the circuit and / or the high-pressure test bench is traversed in a first flow direction counterclockwise, starting from and / or relative to the test gas injection point (in a top view). It may be provided that the circuit and / or the high-pressure test bench is traversed in a second flow direction clockwise, starting from and / or relative to the test gas injection point (in a top view). Starting from the test gas injection point, the following may be arranged (next and / or counterclockwise in a top view): - the hydrogen supply unit, - another gas chromatograph, - a circulation unit, - a temperature control unit, - a flushing unit, - a built-in unit designed to accommodate at least one (to be tested) gas meter, in particular between an inlet-side connection part and an outlet-side connection part, - a first, second, third and / or fourth comparison meter, in particular (parallel and / or in parallel pipeline sections and / or selectable) arranged between the comparison meter inlet valve and the comparison meter outlet valve, - a pressure sensor, and / or - a discharge unit, in particular designed as a three-way valve, which closes the (self-contained closed circuit) in the direction of flow.

[0031] The control unit can be connected (separately) to one, some or all of the above components via a data connection, in particular to receive measured values ​​(e.g. from sensors or counters) and / or to control them (e.g. valves, actuators, and / or the like) via control signals.

[0032] This results in the same advantages with regard to a high-pressure test bench according to the invention as have already been described with regard to a method according to the invention.

[0033] Within the scope of the invention, it is optionally possible for the high-pressure test bench to have a temperature control unit, in particular a heat exchanger, which is set up to temperature control the test gas.

[0034] Preferably, the temperature control unit can be arranged between the circulation unit and the at least one gas meter to be tested, in particular between the circulation unit and the purge unit. The temperature control unit can be configured to set a (pre-)defined temperature of the test gas and / or (within) the high-pressure test bench. This allows the temperature control unit to function as a heating unit and / or a cooling unit. For example, the temperature control unit can include a heat exchanger. This can, in particular, increase the efficiency and / or the energy efficiency.

[0035] Furthermore, it may be provided within the scope of the invention that the high-pressure test bench has at least one installation unit which is designed to accommodate at least one gas meter to be tested, wherein in particular the installation unit has at least one inlet-side connection part and one outlet-side connection part, between which the at least one (or at least two, three, or four) gas meter(s) to be tested can be arranged (arranged) in a fluid-tight manner by installation.

[0036] The gas meter(s) can be (reversibly) attached to the installation unit, for example, using clamp connections. Preferably, a fluid-carrying and / or (externally) fluid-tight connection can be established. Fluids can include the test gas and / or gases located within the high-pressure test bench. Preferably, no fluids escape from the (closed) circuit and / or high-pressure test bench to the outside. It is possible to install (only) one gas meter to be tested. Additional sealed pipe sections can be provided to bridge a (potentially) excessive distance between the inlet and outlet connections. Alternatively, it is possible to install at least two, three, or four gas meters simultaneously, particularly if they have a similar or identical cross-section.This allows multiple data connections to be established with the control unit. Therefore, different gas meters can be tested simultaneously within the procedure.

[0037] With regard to the present invention, it is conceivable that the high-pressure test bench has a rinsing unit which is equipped for rinsing the high-pressure test bench with a rinsing fluid, in particular a rinsing gas.

[0038] The purging unit can preferably be located upstream of the gas meter(s), in particular between the inlet connection and the circulation unit (or the temperature control unit). For example, the purging unit can have at least one (or two) three-way valves. This allows purging gas to be introduced into the high-pressure test bench, for example, by a first purging valve directing the purging gas into the high-pressure test bench and / or a second purging valve (after a cycle of the high-pressure test bench) diverting the purging gas out of the high-pressure test bench. The high-pressure test bench can otherwise be designed to be self-contained, and in particular circular and / or counterclockwise (see, for example, Figure 1). Fig. 1) is flowed through. For example, the discharge unit can be permeable and / or not allow any connection to the outside. The test gas valve can be closed. Preferably, the hydrogen supply unit can be permeable and / or not introduce hydrogen from the outside into the high-pressure test bench. It can also be provided that a section-by-section purging is carried out. For example, the purge gas can be introduced into the high-pressure test bench through the purge unit. Subsequently, the purge gas can be passed through the first, second, third, and (simultaneously) / or fourth comparison counter to advantageously purge them. Alternatively or additionally, it can be provided that the purge gas is (already) discharged through the discharge unit, in particular by a (three-way) valve of the discharge unit blocking a passage within the high-pressure test bench and instead diverting the purge gas out of the high-pressure test bench, e.g.into the environment and / or a collection container. The purge gas can contain nitrogen and / or natural gas. Preferably, the purge and / or purge gas can be configured to flush out impurities, in particular (gas, liquid, and / or solid) residues, hydrogen, and / or oxygen. This can reduce wear and / or improve safety. At least two or a plurality of purge units can be provided, which can be arranged, in particular, between the other components and / or be connected via the multi-function valves. This allows for section-by-section purge. Preferably, only some sections or only one section can be purged (selectively). This saves purge gas. Alternatively or additionally, a specific section can be purged more intensively and / or repeatedly and / or multiple times.

[0039] Alternatively or additionally, the high-pressure test bench may be provided with one or more multi-function valves. These may be designed as single and / or double three-way valves. A double three-way valve can supply a medium, e.g., purge gas, to a first three-way valve (e.g., located downwards in the flow direction) and discharge the medium, e.g., the purge gas, via a second three-way valve, whereby preferably no flow is possible between the first and second three-way valves and / or these can preferably be arranged directly next to each other. The multi-function valve(s) may, for example, be configured to allow the (or)to connect a further (in particular movable and / or flexibly connectable) purging unit, gas chromatograph, test gas valve, pre-temperature control unit, hydrogen supply unit, further gas chromatographs, recirculation unit, temperature control unit, pressure sensor, discharge unit, and / or collection container. This allows for flexible, section-by-section and / or location-based purging, measurement (e.g., pressure), temperature control, discharge, and / or circulation.

[0040] For example, certain sections can be purged more intensively, repeatedly, and / or in two different flow directions (e.g., first and second flow direction), for example, by connecting a purge gas unit to a first multi-function valve to introduce purge gas, and by dischargering the purge gas, e.g., via a collection container, at a subsequent multi-function valve (particularly in the flow direction and / or counterclockwise). A multi-function valve can be arranged, in particular (in the flow direction or flow direction) upstream of, - the gas chromatograph, - the test gas valve, - the pre-tempering unit, - the hydrogen supply unit, - the further gas chromatograph, - the circulation unit, - the temperature control unit, - the flushing unit, - the inlet-side connecting part, - the first, second, third and / or fourth comparison counter, - the pressure sensor, - the dispensing unit, and / or - in front of a test gas injection point.

[0041] Furthermore, it is conceivable that the high-pressure test bench has at least two, in particular parallel-connected, comparison counters which are set up for comparative measurement, wherein in particular the control unit is set up for adjusting one of the at least two comparison counters.

[0042] This allows the comparator counter to be disconnected from and / or connected to the high-pressure test bench. This can be achieved in particular by controlling and / or adjusting the comparator counter inlet valve and / or (in parallel) the comparator counter outlet valve.

[0043] Within the scope of the invention, it may be advantageous for the high-pressure test bench to have a gas chromatograph which is set up to determine a gas composition of the test gas, wherein in particular the gas chromatograph can be connected to the test gas reservoir (and in particular is connected during filling and / or is separated by separation).

[0044] The gas chromatograph can be positioned between the test gas valve and the external test gas reservoir. The control unit can be connected to the gas chromatograph via a data link, particularly before filling. The control unit can initially and / or continuously receive information about the gas composition of the test gas (which enters the high-pressure test bench during filling) from the gas chromatograph. This allows, especially when hydrogen is added, the setting of a (pre-)defined and / or a range of test gas(es) (particularly depending on the existing composition) and / or the measurement of the gas meter(s) specifically for these test gases.

[0045] Within the scope of the invention, it is conceivable that the high-pressure test bench has a hydrogen supply unit which is equipped for supplying hydrogen, in particular from a hydrogen reservoir (external, connectable to the high-pressure test bench and / or belonging to the high-pressure test bench).

[0046] For example, after performing the procedure, particularly after circulation, measurement, comparison measurement, and / or determination, the hydrogen content can be increased. For instance, the hydrogen content can be increased from an initial 0%, particularly in 10% increments, to ultimately reach 90%, 95%, 99%, or 100% hydrogen. The gas chromatograph can then detect the composition of the test gas (repeatedly and / or continuously). Depending on the detected actual composition, the control unit can adjust the gas composition to a target composition, particularly a predefined and / or desired gas composition, for example, by adding hydrogen.

[0047] Within the scope of the invention, it may be provided that the high-pressure test bench has a further gas chromatograph which is set up to determine a gas composition of the test gas, wherein in particular the further gas chromatograph is arranged after the hydrogen supply unit and / or before the purge unit.

[0048] The additional gas chromatograph can be positioned, for example, between the test gas injection point, particularly the hydrogen supply unit, and the recirculation unit. This additional gas chromatograph can be configured to measure the composition of the test gas. Furthermore, the additional gas chromatograph can be connected to the control unit via a data link, enabling data communication, particularly regarding the composition measured by the additional gas chromatograph, to the control unit.

[0049] It is also conceivable that the high-pressure test bench has a pre-heating unit which is designed to pre-heat, in particular to heat, the test gas, especially when filling the high-pressure test bench.

[0050] The pre-tempering unit can include a heating unit and / or a cooling unit, in particular a heat exchanger. This allows the test gas to be pre-tempered during filling. This enables a (pre-)defined temperature to be set more quickly. The pre-tempering unit can be connected to the control unit via a data link, allowing the control unit to control and / or regulate the pre-tempering unit to provide heating or cooling power, for example, via a control signal.

[0051] It is also conceivable that the high-pressure test bench has a discharge unit which is designed to remove test gas from the high-pressure test bench.

[0052] The discharge unit can be configured to discharge the test gas and / or the gas contained in the high-pressure test bench, particularly the (closed) circuit (e.g., back into a natural gas network and / or an external discharge container). The discharge unit can be connected to the control unit via a data link, enabling the control unit to manage and / or regulate the discharge unit, particularly to discharge (at least partially) the test gas, for example, via a control signal. The discharge unit can include a three-way valve which, for example, in a fully open position, forms a closed circuit within the high-pressure test bench and / or repeatedly supplies the test gas to the test gas injection point, particularly in a first flow direction.In a discharge position other than the continuous position, the test gas can be (at least partially) discharged from the high-pressure test bench (with increasing switching). This can be advantageously done if the hydrogen content is to be increased.

[0053] The high-pressure test bench can, for example, be located in a building. The building and / or the high-pressure test bench can have an ambient air monitoring system, preferably designed to detect escaping test gas and / or hydrogen. If this occurs, a warning signal can be emitted and / or the high-pressure test bench can be emptied, particularly via the discharge unit. Alternatively or additionally, the test gas valve can be closed. It can also be provided that a safety de-energization of the high-pressure test bench is initiated. The ambient air monitoring system can be connected to the control unit via a data link. This allows measurement results from the ambient air monitoring system to be transmitted to the control unit. The control unit can therefore initiate an emergency shutdown, safety de-energization, and / or purging if natural gas and / or hydrogen are detected.It may also be provided that an emergency venting to the atmosphere (especially the area surrounding the building) is possible. This can improve the safety of (operating) personnel in the building and / or near the high-pressure test bench.

[0054] The above problem is solved according to a third aspect by a computer program product according to the invention, comprising instructions which, when the computer program product is executed by a computer, cause it to implement the method according to the first aspect.

[0055] This results in the same advantages with regard to a computer program product according to the invention as have already been described with regard to a method according to the invention and / or a high-pressure test bench according to the invention.

[0056] The above problem is solved according to a fourth aspect by a computer-readable data carrier according to the invention, in which instructions are stored which, when executed by a computer, cause it to carry out the method according to the first aspect.

[0057] This results in the same advantages with regard to a computer-readable data carrier according to the invention as have already been described with regard to a method according to the invention and / or a high-pressure test bench according to the invention and / or a computer program product according to the invention.

[0058] The above problem is solved according to a fifth aspect by a control unit according to the invention, comprising a computing unit and / or a storage unit in which instructions are stored which, when at least partially executed by the computing unit, carry out a method according to the first aspect.

[0059] The control unit can implement and / or execute the procedure according to the first aspect (at least partially) (see above). The gas chromatograph, the test gas valve, the pre-temperature unit, the hydrogen supply unit, the additional gas chromatograph, the recirculation unit, the temperature control unit, the purge unit, the inlet connection, the outlet connection, the (first, second, third, and / or fourth) reference meter, the pressure sensor, the discharge unit, the gas meter under test, the test gas reservoir, and / or the hydrogen reservoir can be connected to the control unit via a data connection (e.g., wired). This allows the control unit to control these components (e.g., via control signals) and / or receive information from them, in particular measurement data and / or valve positions, etc.Thus, the control unit (centrally) can control and / or regulate the high-pressure test bench (according to the second aspect). The control unit can then implement the procedure according to the first aspect.

[0060] This results in the same advantages with regard to a control unit according to the invention as have already been described with regard to a method according to the invention and / or a high-pressure test bench according to the invention and / or a computer program product according to the invention and / or a computer-readable data carrier according to the invention.

[0061] Further advantages, features, and details of the invention will become apparent from the following description, in which several exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can be essential to the invention individually or in any combination. The drawings illustrate this by way of example. Fig. 1 a procedure, and Fig. 2 a high-pressure test bench.

[0062] In the following figures, identical reference numerals are used for the same technical features, even for different embodiments.

[0063] Fig. Figure 1 shows a method for operating a high-pressure test bench 100, which is set up for testing at least one gas meter 300 to be tested, in particular a flow gas meter and / or large gas meter, especially for natural gas and / or hydrogen, comprising: - Connect 110 of the high-pressure test stand 100 to a test gas reservoir 200, which is set up to supply a test gas G to the high-pressure test stand 100, - Filling 120 of the high-pressure test stand 100 with the test gas G until the pressure in the high-pressure test stand 100 reaches a test pressure, - Separating 130 of the high-pressure test stand 100 from the test gas reservoir 200, - Circulating 140 of the test gas G in the high-pressure test stand 100 through a circulation unit 40 of the high-pressure test stand 100 in order to set a defined volume flow of test gas G which flows through the high-pressure test stand 100, - Measuring 150, in particular by the gas meter 300 to be tested, a volume flow of test gas G, which flows through the gas meter 300 to be tested in order to obtain a measurement result, - Comparative measurement 160, by means of a comparator meter 81, 82, 83 84, of a volume flow of test gas G, which flows through the comparator meter 81, 82, 83 84 of the high-pressure test stand 100 in order to obtain a comparative measurement result, - Determine 170, by means of a control unit ECU, a deviation between the measurement result and the comparison measurement result, in order to verify at least one function of the gas meter 300 under test.

[0064] Within the scope of the invention, it may be advantageous that the circulation 140, measurement 150 and / or comparative measurement 160 comprises tempering 141 of the test gas G by a tempering unit 50, in particular a heat exchanger.

[0065] Within the scope of the invention, it is conceivable that, in particular before connecting 110, at least one gas meter 300 to be tested, preferably at least two gas meters 300 connected in series to be tested, is installed 105 in the high-pressure test stand 100.

[0066] Within the scope of the invention, it may be provided that, in particular before connecting 110 and / or after installing 105, a rinsing 106 of the high-pressure test stand 100 is carried out by a rinsing unit 60 with a rinsing fluid, in particular a rinsing gas.

[0067] It is further conceivable that, particularly before circulating 140 and / or measuring 150, a setting 135, particularly by a control unit ECU, of one of at least two, particularly parallel-connected, comparison counters 81, 82, 83, 84 is carried out, wherein the at least two (or as in Fig. 2 shown four) comparison counters 81, 82, 83 84 are set up and / or optimized for measuring 150 and / or comparing different volume flows, and in particular are arranged between a comparison counter inlet valve 80 and a comparison counter outlet valve 89.

[0068] It is also conceivable that the circulation 140, in particular the measuring 150 and / or comparative measuring 160, is carried out by setting at least two different defined volume flows, whereby a measurement curve is obtained in particular by repeated measuring and a comparison curve is obtained by repeated comparative measuring, whereby the determination 170 is carried out depending on the measurement curve and the comparison measurement curve.

[0069] Fig. Figure 2 shows a high-pressure test stand 100 for checking at least one gas meter 300 to be tested, in particular a flow gas meter and / or large gas meter, especially for natural gas and / or hydrogen, comprising: - a test gas valve 20, which can be connected to a test gas reservoir 200 in order to supply a test gas G to the high-pressure test stand 100, - a pressure sensor 90 set up to measure a pressure in the high-pressure test bench 100, - a circulation unit 40, which is set up to circulate 140 of a test gas G in the high-pressure test stand 100, - a control unit ECU which can be connected to the gas meter 300 to be tested via data communication, in particular via a data connection (shown as a dashed line), - one (or four) comparison counters 81, 82, 83 84, which is set up for comparative measurement of 160 of the volume flow of test gas G, - wherein the high-pressure test rig 100 is set up to carry out the procedure according to the first aspect and / or Fig. 1.

[0070] The arrows can represent a first direction of flow.

[0071] Within the scope of the invention, it is optionally possible that the high-pressure test stand 100 has a temperature control unit 50, in particular a heat exchanger, which is set up for temperature control 141 of the test gas G.

[0072] Furthermore, it may be provided within the scope of the invention that the high-pressure test stand 100 has at least one installation unit which is designed to accommodate at least one gas meter 300 to be tested, wherein in particular the installation unit has at least one inlet-side connecting part 71 and an outlet-side connecting part 72, between which the at least one gas meter 300 to be tested can be arranged in a fluid-tight manner by installation 105.

[0073] With regard to the present invention, it is conceivable that the high-pressure test stand 100 has a rinsing unit 60 which is equipped for rinsing 106 of the high-pressure test stand 100 with a rinsing fluid, in particular a rinsing gas.

[0074] Furthermore, it is conceivable that the high-pressure test bench 100 has at least two (or, as shown, four), in particular parallel-connected, comparison counters 81, 82, 83, 84, in particular a first comparison counter 81, a second comparison counter 82, a third comparison counter 83, and / or a fourth comparison counter 84, which are configured for comparative measurement 160, wherein in particular the control unit ECU is configured for setting 135 one of the at least two comparison counters 81, 82, 83, 84. These can be arranged in parallel to each other between a comparison counter inlet valve 80 and a comparison counter outlet valve 89. Preferably, the test gas G can flow through only one of the comparison counters, while the others are shut off. Accordingly, in particular in a closed circuit in Fig. 2 in top view the test gas G flows (repeatedly) through or circulates the high-pressure test stand 100.

[0075] Within the scope of the invention, it can be advantageous for the high-pressure test rig 100 to have a gas chromatograph 10, which is configured to determine the gas composition of the test gas G, wherein, in particular, the gas chromatograph 10 can be connected to the test gas reservoir 200. The test gas G can be supplied (externally) via a test gas reservoir 200, especially when the control unit ECU, which is connected to the test gas valve 20 via a (dashed) data connection, opens the test gas valve 20. Preferably, the discharge unit 99 is continuously open, so that the test gas G flows from bottom to top through the discharge unit 99.

[0076] Within the scope of the invention, it is conceivable that the high-pressure test bench 100 has a hydrogen supply unit 31, which is configured for supplying hydrogen, in particular from an external hydrogen reservoir 400 that is connectable to and / or belongs to the high-pressure test bench. The hydrogen can preferably flow (only) towards the hydrogen supply unit 31. The hydrogen supply unit 31 can be configured as a (three-way) valve.

[0077] Within the scope of the invention, it may be provided that the high-pressure test stand 100 has a further gas chromatograph 32, which is set up to determine a gas composition of the test gas G, wherein in particular the further gas chromatograph 32 is arranged after the hydrogen supply unit 31 and / or before the purge unit 60.

[0078] It is also conceivable that the high-pressure test stand 100 has a pre-heating unit 30, which is designed for pre-heating, in particular for heating, the test gas G, especially when filling 120 of the high-pressure test stand 100.

[0079] It is also conceivable that the high-pressure test stand 100 has a discharge unit 99, which is designed to discharge test gas G from the high-pressure test stand 100.

[0080] The high-pressure test bench 100 comprises a control unit ECU, having a computing unit CU and / or a storage unit MU, in which instructions are stored which, in particular when executed at least partially by the computing unit CU, perform the method according to the invention and / or the method according to Fig.1. In this process, (for example) the gas meter 300 to be tested, a fourth comparison meter 84, the test gas valve 20, and the circulation unit 40 are connected to the control unit ECU, in particular the processing unit CU, via their respective data connections (shown with dashed lines). Of course, the other components (as described above) can also be connected to the control unit ECU via a data connection. This allows the control unit ECU to implement the procedure. Reference symbol list 10 Gas chromatograph 20 test gas valve 30 Pre-heating unit 31 Hydrogen supply unit 32 further gas chromatographs 40 circulation units 50 temperature control units 60 flushing units 71 Input-side connecting part 72 output side connecting part 80 Comparison meter inlet valve 81, 82, 83, 84 Comparison counter 81 first comparison counter 82 second comparison counter 83 third comparison counter 84 fourth comparison counter 89 Comparison counter output valve 90 Pressure sensor 99 Dispensing unit 100 high-pressure test bench 105 Installing a gas meter to be tested 106 Rinsing the high-pressure test bench 110 Connecting the high-pressure test bench to a test gas reservoir 120 Filling the high-pressure test stand with a test gas 130 Separating the high-pressure test stand from the test gas reservoir 135 Setting a comparison counter 140 Circulating the test gas in the high-pressure test stand 141 Temperature control of the test gas by a temperature control unit 150 measurements through the gas meter to be tested 160 comparative measurements by a comparator 170 Determining a deviation 200 test gas reservoir 300 gas meters to be tested 400 hydrogen reservoir ECU control unit CU computing unit MU storage unit G Test gas Gin test gas injection point

Claims

[1] Method for operating a high-pressure test bench (100) which is set up for testing at least one gas meter (300) to be tested, in particular a flow gas meter and / or large gas meter, especially for natural gas and / or hydrogen, comprising: - Connecting (110) the high-pressure test stand (100) to a test gas reservoir (200) which is designed to supply a test gas (G) to the high-pressure test stand (100), - Filling (120) the high-pressure test stand (100) with the test gas (G) until the pressure in the high-pressure test stand (100) reaches a test pressure, - Separation (130) of the high-pressure test stand (100) from the test gas reservoir (200), - Circulating (140) the test gas (G) in the high-pressure test stand (100) by means of a circulation unit (40) of the high-pressure test stand (100) in order to set a defined volume flow of test gas (G) which flows through the high-pressure test stand (100), - Measuring (150), in particular by the gas meter (300) under test, a volume flow of test gas (G) which flows through the gas meter (300) under test in order to obtain a measurement result, - Comparative measurement (160), by means of a comparator meter (81, 82, 83 84), of a volume flow of test gas (G) which flows through the comparator meter (81, 82, 83 84) of the high-pressure test stand (100) in order to obtain a comparator measurement result, - Determine (170), by means of a control unit (ECU), a deviation between the measurement result and the comparison measurement result in order to verify at least one function of the gas meter (300) under test. [2] Method according to claim 1, characterized by , that the circulation (140), measurement (150) and / or comparison measurement (160) includes tempering (141) of the test gas (G) by a tempering unit (50), in particular a heat exchanger. [3] Method according to claim 1 or 2, characterized by, that, in particular before connecting (110), at least one gas meter (300) to be tested, preferably at least two gas meters (300) connected in series to be tested, is installed (105) in the high-pressure test stand (100). [4] Method according to any of the preceding claims characterized by , that, in particular before connecting (110) and / or after installation (105), the high-pressure test stand (100) is flushed (106) by a flushing unit (60) with a flushing fluid, in particular a flushing gas. [5] Method according to any of the preceding claims characterized by, that, in particular before circulating (140) and / or measuring (150), an adjustment (135) is carried out, in particular by a control unit (ECU), of one of at least two, in particular in parallel connected, comparison counters (81, 82, 83 84), wherein the at least two comparison counters (81, 82, 83 84) are set up and / or optimized for measuring (150) and / or comparing (160) different volume flows, and in particular are arranged between a comparison counter inlet valve (80) and a comparison counter outlet valve (89). [6] Method according to any of the preceding claims characterized by, that the circulation (140), in particular the measuring (150) and / or comparative measuring (160), is carried out by setting at least two different defined volume flows, whereby in particular a measurement curve is obtained by repeated measuring and a comparison curve is obtained by repeated comparative measuring, wherein the determination (170) is carried out depending on the measurement curve and the comparison measurement curve. [7] High-pressure test stand (100) for testing at least one gas meter (300) to be tested, in particular a flow gas meter and / or large gas meter, especially for natural gas and / or hydrogen, comprising: - a test gas valve (20) which can be connected to a test gas reservoir (200) to supply a test gas (G) to the high-pressure test stand (100), - a pressure sensor (90) installed to measure pressure in the high-pressure test bench (100), - a circulation unit (40) which is set up to circulate (140) a test gas (G) in the high-pressure test stand (100), - a control unit (ECU) which can be connected to the gas meter (300) to be tested via data communication, - a comparison meter (81, 82, 83 84) which is set up for comparative measurement (160) of the volume flow of test gas (G), - wherein the high-pressure test bench (100) is configured to carry out the method according to any one of the preceding claims 1 to 6. [8] High-pressure test stand (100) according to one of the preceding claims characterized by , that the high-pressure test stand (100) has a temperature control unit (50), in particular a heat exchanger, which is set up for temperature control (141) of the test gas (G). [9] High-pressure test stand (100) according to one of the preceding claims characterized by, that the high-pressure test bench (100) has at least two, in particular parallel connected, comparison counters (81, 82, 83, 84) which are set up for comparative measurement (160), wherein in particular the control unit (ECU) is set up for setting (135) one of the at least two comparison counters (81, 82, 83, 84). [10] High-pressure test stand (100) according to one of the preceding claims characterized by , that the high-pressure test stand (100) has a gas chromatograph (10) which is set up to determine a gas composition of the test gas (G), wherein in particular the gas chromatograph (10) is connectable to the test gas reservoir (200). [11] High-pressure test stand (100) according to one of the preceding claims characterized by, that the high-pressure test bench (100) has a hydrogen supply unit (31) which is designed to supply hydrogen, in particular from a (external, connectable to and / or belonging to the high-pressure test bench) hydrogen reservoir (400). [12] High-pressure test stand (100) according to one of the preceding claims characterized by , that the high-pressure test stand (100) has a further gas chromatograph (32) which is set up to determine a gas composition of the test gas (G), wherein in particular the further gas chromatograph (32) is arranged after the hydrogen supply unit (31) and / or before the purge unit (60). [13] Computer program product comprising instructions which, when executed by a computer, cause the computer to implement the method according to any one of the preceding claims 1 to 6. [14] Computer-readable data carrier in which instructions are stored which, when executed by a computer, cause it to carry out the method according to any one of the preceding claims 1 to 6. [15] Electronic control unit (ECU) comprising a computing unit (CU) and / or a storage unit (MU) in which instructions are stored which, when at least partially executed by the computing unit (CU), perform a method according to any one of the preceding claims 1 to 6.

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