An assembly comprising a fluid dispenser and a simulator of a tank to be filled, and the use of such an assembly

Abstract

Assembly (1) comprising a pressurized fluid distribution distributor (2) and a simulator (3) of a tank to be filled from the distributor (2), the simulator (3) comprising a transfer line connected to the distributor (2) and comprising a pressure controller (PCV1), the pressure controller (PCV1) being configured to regulate a pressure and / or a flow rate of a fluid stream passing through the pressure controller (PCV1), so as to simulate a pressure rise in the tank to be filled, the distributor (2) and the simulator (3) comprising respectively a primary flow meter (FE0) and a secondary flow meter (FE2), the primary flow meter (FE0) being configured to estimate a first quantity of a fluid stream supplied to the pressure controller (PCV1) and thus to the tank simulated by the pressure controller (PCV1), the secondary flow meter (FE2) being disposed on the transfer line, downstream of the pressure controller (PCV1),and configured to measure a second quantity of the fluid flow supplied to the pressure controller (PCV1) and thus to the reservoir simulated by the pressure controller (PCV1), characterized in that the simulator (3) also comprises a programmable electronic control unit (PLC) configured to compare the second quantity of the fluid flow with the first quantity of the fluid flow, so as to verify the reliability of the first quantity of the fluid flow. Abstract figure: Fig. 1,

Description

Description Title of the invention: Assembly comprising a fluid dispenser and a simulator of a tank to be filled, and use of a such a set

[0001] = The invention relates to an assembly comprising a fluid distributor and a si- emulator of a reservoir to be filled by the distributor.

[0002] = The invention also relates to the use of such an assembly to control the reliability of the distributor, and in particular the reliability of the measurements provided and / or displayed by the distributor. More specifically, it involves checking the reliability of a quantity of fluid assumed to be delivered by the distributor to a tank to be filled.

[0003] — The fluid in question is under pressure. It may be gaseous hydrogen or gas natural.

[0004] — The invention finds principal application in legal metrology ap- Applicable to pressurized fluid distributors. Legal metrology is understood here. of an approach aimed at verifying that a quantity of fluid assumed to be delivered by a single-tank dispenser (i.e., a quantity of fluid billed to a customer) corresponds to the quantity of fluid actually delivered to the reservoir.

[0005] — However, the invention can be implemented in the context of in- metrology industrial or within the framework of scientific metrology. Industrial metrology aims to ensure the validity and reliability of measurement results in a vo- approach lentiaire of a laboratory, organization or industry, etc. Scientific metrology includes research and development of measurement instruments and techniques in order to improve accuracy and fidelity, and consequently greater reliability in all measurements.

[0006] — To verify / certify the reliability of the quantities of fluid billed / displayed by a distributor, the current legal metrology procedure provides for a test tank connected to the gas station, as well as a scale to determine the weight of this tank before and after filling. The difference in weight calculated on the tank Testing before and after filling gives an indication of the amount of fluid actually supplied to this reservoir, this quantity of fluid is compared to a value displayed by the distributor to establish the reliability of the latter.

[0007] — The test tank is chosen so as to be representative of the tanks encountered on motor vehicles. For example, the test tank may be type 3 or 4 with a capacity ranging from 100 to over 2000L.

[0008] — The use of a test tank (of any type) represents a cost significant acquisition and maintenance costs that affect the total cost of Verification / certification operations carried out within the framework of legal metrology. In addition, the use of a test tank involves time-consuming procedures before, during, and after the tank filling test. In particular, after the test tank has been filled, it must be depressurized for storage and / or transport, and / or for subsequent refilling. Because the test tank is fragile, it must not be allowed to cool below -40 °C or undergo rapid depressurization. For example, depressurizing a 100 L test tank from 700 bar to 30 bar can take more than an hour. Furthermore, we know of an assembly comprising a pressurized fluid dispenser and a simulator of a tank to be filled from the dispenser. The simulator is connected to the fluid dispenser. In particular, the simulator includes a transfer line comprising a pressure controller configured to regulate a pressure and / or flow rate of a fluid stream passing through the transfer line, so as to simulate a pressure rise in the tank to be filled. The distributor and the simulator each include a primary flow meter and a secondary flow meter, respectively. The primary flow meter is configured to determine the initial quantity of fluid flowing from the distributor. The secondary flow meter is configured to measure the second quantity of fluid flowing through the transfer line. The assembly described above allows for testing the operation of a pressurized fluid distributor. Specifically, this assembly allows for testing the distributor's control, regulation, and safety components under various operating scenarios that are not always possible or easy to reproduce in real-world conditions. These operating scenarios involve a large number of tanks to be filled simultaneously or successively. They consist, for example, of a rapid sequence between two successive fillings, a variation in ambient temperature between two successive fillings, successive fillings of tanks having different initial pressures, etc. Apart from functional testing of a pressurized fluid distributor, no other application has been envisaged to date using the assembly described above, even though the presence of the pressure controller as a means of simulating a pressure rise in a tank to be filled can be used in other applications where the use of a test tank (i.e. a real tank) poses operational difficulties. The invention, according to a first aspect, relates to an assembly comprising a dis- distributor of pressurized fluid and a simulator of a tank to be filled from the dispenser. Specifically, the simulator includes a transfer line connected to the station and a pressure controller configured to regulate the pressure and / or flow rate of a fluid passing through the transfer line. This pressure controller allows for the simulation of a pressure increase in the tank to be filled. The distributor and the simulator each include a primary flow meter and a secondary flow meter, respectively. The primary flow meter is configured to estimate the initial quantity of fluid flow supplied to the pressure controller and thus to the tank simulated by the pressure controller. The secondary flow meter is located on the transfer line, downstream of the pressure controller, and is configured to measure the second quantity of fluid flow supplied to the pressure controller and thus to the tank simulated by the pressure controller. According to this first aspect of the invention, the simulator also includes a programmable electronic control unit configured to compare the second quantity of fluid flow with the first quantity of fluid flow, so as to verify the reliability of the first quantity of fluid flow. According to a second aspect, the invention relates to the use of the assembly described above to determine more precisely the quantity of fluid supplied to the pressure controller and thus to the tank simulated by the pressure controller. Such precision is made possible by the presence of the secondary flow meter downstream of the pressure controller. The secondary flow meter thus acts as a flow meter located inside the tank to be filled. With an additional measurement of the fluid flow delivered to the pressure controller (which simulates a tank to be filled), a measurement available thanks to the presence of the secondary flow meter on the transfer line, and more precise thanks to the positioning of this second flow meter downstream of the pressure controller, it becomes possible to verify the reliability of a quantity of fluid assumed to be supplied to the pressure controller and determined from the main flow meter. According to a third aspect, the invention relates to the use of the assembly described above for metrology, particularly for legal metrology, in the field of pressurized fluid distributors, and specifically for verifying the reliability of measurements provided by a pressurized fluid distributor. In particular, it involves using the assembly described above to verify the reliability of a flow measurement provided by the primary flow meter by comparison with a flow measurement provided by the secondary flow meter. Thus, the invention according to this third aspect introduces a new approach for verifying and / or certifying flow rate or fluid quantity data such as de- completed / displayed by a pressurized fluid dispenser. Following this new approach, the pressure controller replaces the prior art test tank. Furthermore, a flow measurement of a stream passing through the pressure controller replaces the pre-filling and post-filling weighings performed on the test tank according to the prior art. This new approach eliminates the drawbacks of legal metrology as practiced in the prior art. This results in a simplification of the verification / certification procedure for pressurized fluid distributors. Embodiments of the invention according to any of the above aspects may include one or more of the following features: - The pressure controller is configured to increase the fluid flow pressure upstream of the pressure controller, and decrease the fluid flow pressure after the fluid has passed through the pressure controller. - the transfer line has, downstream of the pressure controller, a portion, called the downstream portion, with a larger cross-section compared to a cross-section of a portion of the transfer line located upstream of the pressure controller, - The downstream portion of the transfer line is configured to minimize pressure losses after the fluid passes through the pressure controller. - the secondary flow meter is located at the downstream portion of the transfer line, - The secondary flow meter is more accurate than the primary flow meter. - the accuracy of the secondary flow meter is less than 0.004%, - The secondary flow meter is based on a phenomenon or physical quantity different from a phenomenon or physical quantity associated with the primary flow meter. - The electronic control unit is configured to modify the resistance of the pressure controller to the flow of fluid through the transfer line, and thus modify the pressure of the fluid flow through the transfer line. - The electronic control unit is controlled using a mathematical model and at least one of the following data measured on the fluid flow through the transfer line: flow rate, temperature or pressure, - The flow rate data is measured by the secondary flow meter located downstream of the pressure controller or by an additional flow meter located upstream or downstream of the pressure controller. - The pressure data is measured by a pressure sensor located upstream of the pressure controller. - The temperature data is measured by a temperature sensor located upstream of the pressure controller. - The transfer line includes a safety valve and / or an automatic valve configured to protect the simulator in case of malfunction, - the transfer line includes a non-return valve configured to ensure fluid flow from the station to the pressure controller, and prevent fluid flow in the reverse direction, - the transfer line includes a receptacle allowing for fluid recovery and / or more precise and stable control of the pressure to which the secondary flow meter is subjected. Other features and advantages will become apparent upon reading the description below, made with reference to the following figures in which: [Fig.1] is a schematic view representing an assembly according to the invention, the assembly comprising a pressurized fluid distributor and a simulator of a tank to be filled from the distributor, the simulator comprising a transfer line provided with a pressure controller; [Fig.2] illustrates an example of a curve giving a time evolution of the resistance of the pressure controller to a fluid flow through the transfer line of [Fig.1]; [Fig.3] illustrates an example of a curve showing a time evolution of the pressure in a tank being filled from the distributor of [Fig.1]. Figure 1 illustrates an assembly 1 comprising a pressurized fluid dispenser 2 and a simulator 3 of a tank to be filled from the dispenser 2. The simulator 3 is connected to the pressurized fluid dispenser 2. The fluid in question can be gaseous hydrogen or natural gas. The distributor 2 comprises a pressurized fluid source and a dispensing element connected to the fluid source by a flexible hose. Specifically, the dispensing element of distributor 2 is configured to be connected to simulator 3. Furthermore, the dispensing element of distributor 2 can be shaped like a nozzle. Furthermore, the distributor 2 includes sensors for measuring several physical properties of the pressurized fluid. These sensors can be located on the flexible hose connecting the source to the distribution unit, or on the distribution unit itself. In particular, the distributor 2 includes a main flow meter (FEO) configured to determine the quantity of fluid exiting the distributor 2. It should be noted that distributor 2 can be used alone without simulator 3. The distributor is in nominal operation. In this case, the dispensing unit of distributor 2 can be connected to a tank to be filled. The quantity of fluid at the outlet of distributor 2 is taken into account to estimate the volume of fluid supplied to simulator 3. In nominal operation of distributor 2, the quantity of fluid at the outlet of distributor 2 is taken into account to estimate the volume of fluid supplied to the tank. This estimated volume serves as the basis for calculating the amount of the commercial transaction (i.e., the amount charged to the service station customer). Simulator 3 includes a fluid transfer line in the form of a conduit with a first end and a second, opposite end. The first end of the conduit is configured to be connected to distributor 2, and more specifically to the distribution element of distributor 2. The fluid flowing through the conduit travels from the first end, referred to as the upstream end, to the second end, referred to as the downstream end. It should be noted that the conduit can be covered with thermal insulation. In particular, the transfer line includes a PCV1 pressure controller, and at least one secondary flow meter FE1, FE2. The PCV1 pressure controller presents resistance to fluid flow. This resistance can vary, resulting in a variation in the flow rate and / or pressure of the fluid flowing through the transfer line. In other words, the PCV1 pressure controller is configured to regulate the flow rate and / or pressure of the fluid flowing through the transfer line. In particular, varying the resistance of the PCV1 pressure controller can lead to an increase in fluid flow pressure upstream of the PCV1 pressure controller, and a decrease in fluid flow pressure downstream of the pressure controller, i.e., after the flow has passed through the PCV1 pressure controller. This is referred to as the regulation of the "upstream pressure" of the fluid by the PCV1 pressure controller. Alternatively, varying the resistance of the PCV1 pressure controller can lead to an increase in fluid pressure after the fluid flow passes through the PCV1 pressure controller. This is referred to as regulating the "downstream pressure" of the fluid by the PCV1 pressure controller. Varying the resistance of the PCV1 pressure controller to the fluid flow (and therefore the resulting variation in fluid flow rate and / or pressure) allows for the re-creation of a pressure rise in a reservoir simulated by the PCV1 pressure controller. The PCV1 pressure controller thus acts as a virtual reservoir. The PCV1 pressure controller includes, for example, a flow and / or pressure regulating valve with a variable passage area. The passage area determines the valve's resistance to fluid flow. In other words, the passage area determines the fluid pressure upstream and / or downstream of the regulating valve. At least one secondary flow meter, FE1, FE2, is configured to measure the quantity of fluid flowing through the transfer line. More specifically, at least one secondary flow meter, FE1, FE2, is configured to measure the quantity of fluid passing through the PCV1 pressure controller. Thus, at least one secondary flow meter [FE], FE2 can be disposed upstream or downstream of the PCV1 pressure controller. In the illustrated example, the transfer line includes a first secondary flow meter FEI located upstream of the pressure controller PCV1 and a second secondary flow meter FE2 located downstream of the pressure controller PCV1. Hereafter, the first secondary flow meter FE1 will also be referred to as the "upstream flow meter". The second secondary flow meter FE2 will also be referred to as the "downstream flow meter". Since the PCV1 pressure controller simulates a tank to be filled, the quantity of fluid measured by the second secondary flow meter FE2 represents a quantity of fluid that would have been supplied to the tank thus simulated by the PCV1 pressure controller. Thus, assembly 1, and in particular the second secondary flowmeter FE2, can be implemented to determine more accurately the quantity of fluid supplied to a tank by the distributor 2, when said tank is simulated by a PCV1 pressure controller. Similarly, assembly 1, and in particular the second secondary flowmeter FE2, can be implemented to verify the reliability of the data determined from the main flowmeter FEO and assumed to represent the volume of fluid delivered to a tank connected to the distributor 2. In other words, assembly 1, and in particular the second secondary flowmeter FE2, can be implemented for metrology, and in particular for legal metrology, in the field of pressurized fluid distributors. Because of its function as a standard in relation to the main flowmeter FEO, the second secondary flowmeter FE2 will also be referred to hereafter as the “metrological flowmeter”. Advantageously, the FE2 metrological flowmeter relies on a different physical phenomenon or quantity than the one associated with the main FEO flowmeter. In other words, the FE2 metrological flowmeter and the main FEO flowmeter are of different types and / or technologies. For example, the FE2 metrological flowmeter may be electromagnetic, while the main FEO flowmeter may be a Coriolis flowmeter. The choice of the primary flow meter (FEO) and the metrological flow meter (FE2), using two different types and / or technologies, is essential for legal metrology applications. Indeed, when both flow meters (FEO and FE2) rely on the same phenomenon or physical quantity, a significant difference in the measurements they provide can make it difficult to determine which measurement is erroneous. In order to allow for a more precise measurement of the amount of fluid passing through the PCV1 pressure controller (and therefore a finer measurement of the quantity of fluid that would be supplied to a tank simulated by the PCV1 pressure controller), it is necessary to provide the metrological flowmeter FE2 with better flow measurement accuracy compared with the upstream flowmeter FE1 or the main flowmeter FEO. To achieve this, according to the invention, the transfer line has, downstream of the PCVI1 pressure controller, a portion, referred to as the downstream portion, having a larger cross-section than a portion of the same transfer line located upstream of the PCV1 pressure controller. The downstream portion of the transfer line is configured to minimize pressure losses after the flow passes through the PCV1 pressure controller. With a relatively lower fluid pressure level at the downstream portion of the transfer line, the FE2 metrological flowmeter placed on this downstream portion can be chosen from a range of flowmeters with superior accuracy. Advantageously, the accuracy of the FE2 metrological flowmeter is less than 0.004%. Such a level of accuracy is generally expected of measuring instruments used in a legal metrology procedure applied to a pressurized fluid distributor. In order to enable control of the PCV1 pressure controller, simulator 3 includes a PLC control unit configured to regulate, from a flow measurement taken on the transfer line, and from a mathematical model, the resistance of the PCV1 pressure controller to the flow of the fluid. The flow measurement used to control the PLC can be provided by the upstream flow meter FEI or the downstream flow meter FE2. In the latter case, the FE2 flow meter performs an additional function beyond its metrological function. The flow measurement used to control the PLC can also be determined by an additional secondary flow meter (not shown) located downstream of the PCV1 pressure controller and separate from the secondary flow meter FF2. In particular, the PLC control unit may include a servomotor configured to drive the PCV1 pressure controller, and specifically to adjust the resistance of the PCV1 pressure controller according to a predefined setpoint. Furthermore, the PLC control unit may include an electronic control unit comprising a programmable microprocessor and / or display means and / or input means. In particular, the microprocessor is configured to receive all or part of the signals from sensors or measuring devices such as the upstream flow meter FE1 or the downstream flow meter FE2, and then send a second signal to the servomotor. Figure 2 illustrates an example of an AS setpoint sent by the PLC control unit to the PCV1 pressure controller. Here, the PCV1 pressure controller is a valve. The AS setpoint consists of a curve QN showing the time variation of the valve's passage area between a maximum value QM, marking the start of fluid flow into an initially empty tank, and a minimum value, marking the end of flow into a fully filled tank. The mathematical model mentioned above is obtained from a filling test carried out on a tank connected to distributor 2. This model includes, for example, a PN curve showing the time evolution of the fluid pressure PH at the distributor outlet (see [Fig. 3]). This evolution can be linear and increase from an initial pressure RD in the reservoir to a maximum value PM. The initial pressure can be higher than atmospheric pressure. In addition, this model may include a curve (not shown) giving a time evolution of the fluid flow rate at the outlet of distributor 2. This evolution may be non-linear and decreasing from a maximum value marking the beginning of filling to a minimum value marking the end of filling. Finally, this model includes a curve (not shown) establishing a correlation between the pH pressure and the fluid flow rate at the outlet of distributor 2. From the correlation curve between pressure (PH) and fluid flow rate at the outlet of the fluid source, and using a flow rate measurement provided by the upstream flow meter (FE2) and / or the downstream flow meter (FE2), it is possible to determine a theoretical value for the fluid pressure at the PCV1 pressure controller. Based on this theoretical pressure value, the PLC control unit adjusts the resistance of the PCV1 pressure controller (for example, according to the setpoint shown in [Fig. 2]) to establish the flow rate through this PCV1 pressure controller at a predetermined value, provided by the pressure / flow rate correlation curve. As the fluid continues to flow through the transfer line, the PN curve, which shows the time evolution of the pressure PH, can be used to determine a fluid pressure value at the PCV1 pressure controller at any given time. The resistance of the PCV1 pressure controller is adjusted accordingly (for example, according to the setpoint shown in [Fig. 2]) to reduce the fluid flow rate through the PCV pressure controller to a predetermined value, provided by the pressure / flow rate correlation curve. It should be noted that to regulate the resistance of the PCV1 pressure controller, the PLC control unit can rely on a curve that correlates the estimated fluid pressure at the PCV1 pressure controller with the resistance of that same PCV1 pressure controller. Such a curve can be used instead of and place of the instruction illustrated in [Fig.2]. It should also be noted that the PLC control unit is also configured to compare a first quantity of fluid, determined by the main flow meter and assumed to represent the volume of fluid passing through the PCV1 pressure controller, with a second quantity of fluid measured by the FE2 metrological flow meter downstream of the PCV1 pressure controller. This comparison establishes the reliability of the first quantity of fluid. Advantageously, the transfer line includes, upstream of the PCV1 pressure controller, a PT pressure sensor and / or a TT temperature sensor. These PT and TT sensors are connected to the PLC control unit and can be used to correct the resistance of the PCV1 pressure controller, as given by the mathematical model described above. In the case of a PCV1 pressure controller consisting of a regulating valve, the TT and PT sensors allow for correction of the valve's passage opening. Advantageously, simulator 3 includes a receptacle 4 for collecting the fluid flowing through the transfer line. In particular, the receptacle 4 can be connected to the fluid distributor 2 via a return line for the purpose of reusing the fluid in the distributor 2. Alternatively, the receptacle 4 can be connected to the ambient environment for venting the fluid. In both cases, the transfer line can be equipped with a second PCV2 pressure controller, which is positioned, as appropriate, between the receptacle 4 and the distributor 2 or between the receptacle 4 and the ambient environment. In the case of a fluidic communication between the receptacle 4 and the distributor 2, the second PCV2 pressure controller is intended to regulate the pressure at the outlet of the receptacle 4 to bring this pressure to a value accepted by the distributor 2. The receptacle 4 can be positioned upstream and / or downstream of the metrological flow meter FE2. When positioned upstream of the metrological flow meter FE2, the receptacle 4 collects a volume of fluid which may introduce uncertainties in the measurement performed by the metrological flow meter FE2. In order to correct such uncertainties, the receptacle 4 upstream of the metrological flow meter FE2 can be equipped with a TT temperature sensor and / or a pressure sensor. When it is placed downstream of the metrological flowmeter FE2, the receptacle 4 helps to stabilize the pressure to which this metrological flowmeter FE2 is subjected. It should be noted that receptacle 4 can be type I or II with a more limited capacity (e.g., 100L) to allow for faster depressurization. In other words, receptacle 4 is not necessarily the same type as a tank. test (generally type III or IV) used for example in a legal metrology procedure according to the prior art. Advantageously, the transfer line can include a CV check valve allowing one-way fluid flow, i.e. from distributor 2 to pressure controller PCV1. Advantageously, the transfer line may include a PSV safety valve and / or an FV automatic valve designed to protect Simulator 3 in case of malfunction. More specifically, the PSV safety valve and / or the FV automatic valve protect Simulator 3, in particular, when the temperature, pressure, or flow rate (measured respectively by the TT temperature sensor, the PT pressure sensor, or at least one secondary flow meter FE1, FE2) exceeds a maximum permissible threshold. In case of malfunction, the control unit (PLC) is configured to emit an alarm signal announcing a shutdown of simulator 3.

Claims

Claims

1. Assembly (1) comprising a distributor (2) of pressurized fluid and a simulator (3) of a tank to be filled from the dispenser (2), the simulator (3) comprising a transfer line connected to the distributor (2) and comprising a pressure controller (PCV1), the controller (PCV1) pressure being configured to regulate a pressure and / or a flow rate of a fluid stream passing through the transfer line, so as to simulate a pressure increase in the tank to be filled, the distributor (2) and the simulator (3) respectively comprising a de- main flowmeter (FEO) and a secondary flowmeter (FE2), the de- main bitmeter (FEO0) being configured to estimate a first quantity of a fluid flow supplied to the pressure controller (PCV1) and so to the tank simulated by the pressure controller (PCV1), the de- secondary bitmeter (FE2) being arranged on the transfer line, downstream of the pressure controller (PCV1), and configured to measure a second quantity of fluid flow supplied to the controller (PCV1) of pressure and therefore to the tank simulated by the controller (PCV1) of Pressure, characterized in that the simulator (3) comprises a member (PLC) of programmable electronic control configured to compare the second quantity of fluid flow with the first quantity of fluid flow fluid, so as to check the reliability of the first quantity of the flow of fluid.

2. Assembly (1) according to the preceding claim, characterized in that the pressure controller (PCV1) is configured to increase pressure of the fluid flow upstream of the pressure controller (PCV1), and decrease the pressure of the fluid flow after a passage of the fluid flow through the pressure controller (PCV1).

3. Assembly (1) according to any one of the preceding claims, characterized in that the transfer line present downstream of the controller (PCV1) of pressure a portion, called downstream portion, of upper section with respect to a section of a portion of the transfer line located in upstream of the pressure controller (PCV1), the downstream portion being configured to minimize pressure losses after the passage of the fluid through the pressure controller (PCV1), the flow meter se- secondary (FE2) being arranged at the downstream portion.

4. Assembly (1) according to any one of the preceding claims, characterized in that the secondary flow meter (FE2) is more accurate than the main flow meter (OEM).

5. Assembly (1) according to the preceding claim, characterized in that the accuracy of the secondary flow meter (FE2) is less than 0.004%.

6. Assembly (1) according to any one of the preceding claims, characterized in that the secondary flow meter (FE2) rests on a phenomenon or physical quantity different from a phenomenon or physical quantity associated with the main flow meter (FE0).

7. Assembly (1) according to any one of the preceding claims, characterized in that the electronic control unit (PLC) is configured to change a resistance of the controller (PCV1) by pressure at the flow of the fluid through the transfer line, and thus modify the pressure of the fluid flow crossing the line of transfer, the electronic control unit (PLC) being controlled using of a mathematical model and at least one of the data following measured on the fluid flow through the transfer line: flow rate, temperature or pressure.

8. Assembly (1) according to the preceding claim, characterized in that the flow data is measured by the secondary flow meter (FE2) located in downstream of the pressure controller (PCV1) or by an additional flow meter (FE]) located upstream or downstream of the pressure controller (PCV 1).

9. Assembly (1) according to any one of claims 7 or 8, ca- characterized in that the pressure data is measured by a sensor (PT) pressure arranged upstream of the pressure controller (PCV 1).

10. Assembly (1) according to any one of claims 7 to 9, ca- characterized in that the temperature data is measured by a sensor (TT) temperature located upstream of the controller (PCV1) of pressure.

11. | Assembly (1) according to any one of the preceding claims, characterized in that the transfer line comprises a valve safety valve (PSV) and / or an automatic valve (FV) configured to protect the simulator (3) in case of malfunction.

12. Assembly (1) according to any one of the preceding claims, characterized in that the transfer line comprises a valve (CV) non-return valve configured to ensure fluid flow from the station (3) to the pressure controller (PCV1), and prevent a flow of fluid in the opposite direction.

13. Assembly (1) according to any one of the preceding claims, characterized in that the transfer line comprises a receptacle (4) allowing fluid recovery and / or more precise control and stable pressure to which the secondary flow meter is subjected {FE2).

14. Use of an assembly (1) according to any one of the claims 1 to 14, for metrology, and in particular for legal metrology, in the field of pressurized fluid distributors, and in particular to check the reliability of measurements provided by a distributor of fluid under pressure.