Assembly comprising a fluid distributor and a simulator of a tank to be filled, and use of such an assembly

Abstract

Assembly (1) comprising a distributor (2) for distributing pressurised fluid 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 flow 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) respectively comprising a main flow meter (FEO) and a secondary flow meter (FE2), the main flow meter (FEO) being configured to estimate a first quantity of a fluid flow supplied to the pressure controller (PCV1) and therefore to the tank simulated by the pressure controller (PCV1), the secondary flow meter (FE2) being arranged 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 therefore to the tank simulated by the pressure controller (PCV1), characterized in that the simulator (3) also comprises a programmable electronic control member (PEC) 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.

Description

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

[0001] The invention relates to an assembly comprising a fluid dispenser and a simulator of a reservoir to be filled by the dispenser.

[0002] The invention also relates to the use of such an assembly for controlling the reliability of the dispenser, and in particular the reliability of measurements provided and / or displayed by the dispenser. More specifically, it is a question of controlling the reliability of a quantity of fluid assumed to be delivered by the dispenser to a tank to be filled.

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

[0004] The invention mainly finds application in legal metrology applicable to pressurized fluid dispensers. Legal metrology here means an approach aimed at verifying that a quantity of fluid supposedly delivered by a dispenser to a tank (i.e. a quantity of fluid invoiced to a customer) corresponds to the quantity of fluid actually delivered to the tank.

[0005] However, the invention can be implemented within the framework of industrial metrology or within the framework of scientific metrology. Industrial metrology aims to ensure the validity and reliability of measurement results in a voluntary approach of a laboratory, organization or industry, etc. Scientific metrology includes the research and development of measuring instruments and techniques with the aim of improving accuracy and precision, and consequently greater reliability in all measurements.

[0006] To verify / certify the reliability of the fluid quantities billed / displayed by a distributor, the legal metrology procedure in force provides for a test tank connected to the service station as well as a scale intended to determine the weight of this tank before and after filling. The difference in weight calculated on the test tank before and after filling gives an indication of the quantity of fluid actually supplied to this tank. 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 to be representative of the tanks found on motor vehicles. For example, the test tank can be type 3 or 4 with a capacity ranging from 100 to more than 2000L.

[0008] The use of a test tank (regardless of the type) represents a significant acquisition and maintenance cost that affects the total cost of verification / certification operations carried out within the framework of legal metrology. In addition, the use of a test tank involves tedious maneuvers before, during and after the test tank filling test.

[0009] In particular, after filling the test tank, it must be depressurized for storage and / or transport, and / or for subsequent filling. Since the test tank is fragile, it must not drop to temperatures below -40 °C or undergo rapid depressurization. Thus, for a test tank with a capacity of 100 L, for example, depressurization from 700 bar to 30 bar may take more than one hour.

[0010] Furthermore, an assembly is known 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.

[0011] In particular, the simulator comprises a transfer line comprising a pressure controller configured to regulate a pressure and / or a flow rate of a fluid flow passing through the transfer line, so as to simulate a pressure rise in the tank to be filled.

[0012] The distributor and the simulator comprise a main flow meter and a secondary flow meter, respectively. The main flow meter is configured to determine a first quantity of a fluid flow at the outlet of the distributor. The secondary flow meter is configured to measure a second quantity of a fluid flow passing through the transfer line.

[0013] The assembly described above allows the operation of a pressurized fluid distributor to be tested. In particular, this assembly allows the control, regulation and safety components of the distributor to be tested according to several operating scenarios that are not always possible or easy to reproduce in real conditions.

[0014] 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 with different initial pressures, etc.

[0015] Apart from operational tests of a pressurized fluid dispenser, 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 increase in a tank to be filled can be used to advantage in other applications where the use of a test tank (i.e. a real tank) poses operational difficulties.

[0016] The invention according to a first aspect relates to an assembly comprising a pressurized fluid dispenser and a simulator of a reservoir to be filled from the dispenser.

[0017] In particular, the simulator comprises a transfer line which is connected to the station and comprises a pressure controller configured to regulate a pressure and / or a flow rate of a fluid flow passing through the transfer line. Thus, the pressure controller makes it possible to simulate a pressure rise in the tank to be filled.

[0018] The distributor and the simulator comprise a main flow meter and a secondary flow meter respectively. The main flow meter is configured to estimate a first quantity of the fluid flow supplied to the pressure controller and therefore to the reservoir simulated by the pressure controller. The secondary flow meter is arranged on the transfer line, downstream of the pressure controller, and configured to measure a second quantity of the fluid flow supplied to the pressure controller and therefore to the reservoir simulated by the pressure controller.

[0019] According to this first aspect of the invention, the simulator also comprises a programmable electronic control member 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.

[0020] 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 therefore to the reservoir simulated by the pressure controller. Such precision is made possible thanks to the presence of the secondary flow meter downstream of the pressure controller. The secondary flow meter thus plays the role of a flow meter which would be arranged inside a reservoir to be filled.

[0021] 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.

[0022] According to a third aspect, the invention relates to the use of the assembly described above for metrology, in particular for legal metrology, in the field of pressurized fluid distributors, and in particular for checking the reliability of measurements provided by a pressurized fluid distributor. This involves in particular using the assembly described above to check the reliability of a flow measurement provided by the main flow meter by comparison with a flow measurement provided by the secondary flow meter.

[0023] Thus, the invention according to this third aspect introduces a novel approach for verifying and / or certifying fluid flow rate or quantity data as determined / displayed by a pressurized fluid dispenser.

[0024] According to this new approach, the pressure controller replaces the test tank of the prior art. In addition, a flow measurement of a stream passing through the pressure controller replaces the pre-fill and post-fill weighings performed on the test tank in accordance with the prior art.

[0025] This new approach makes it possible to overcome 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.

[0026] Embodiments of the invention according to any of the above aspects may comprise one or more of the following features:- the pressure controller is configured to increase the pressure of the fluid flow upstream of the pressure controller, and decrease the pressure of the fluid flow after the fluid flow has passed through the pressure controller,- the transfer line has downstream of the pressure controller a portion, called the downstream portion, of greater cross-section than 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 has passed through the pressure controller,- the secondary flow meter is arranged at the downstream portion of the transfer line,- the secondary flow meter is more accurate than the main 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 main flow meter,- the electronic control member is configured to modify a resistance of the pressure controller to the flow of the fluid passing through the transfer line, and thus modify the pressure of the flow of fluid passing through the transfer line,- the electronic control member is controlled using a mathematical model and at least one of the following data measured on the flow of fluid passing through the transfer line: flow rate, temperature or pressure,- the flow 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 arranged upstream of the pressure controller,- the temperature data is measured by a temperature sensor arranged upstream of the pressure controller,- the transfer line comprises a safety valve and / or an automatic valve configured to protect the simulator in the event of a malfunction,- the transfer line comprises a non-return valve configured to ensure a flow of fluid from the station to the pressure controller, and prevent a flow of fluid in the opposite direction,- the transfer line comprises a receptacle allowing recovery of the fluid and / or more precise and stable control of the pressure to which the secondary flow meter is subjected.,

[0027] Other features and advantages will appear on reading the description below, made with reference to the following figures in which:

[0028] is a schematic view showing an assembly according to the invention, the assembly comprising a pressurized fluid dispenser and a simulator of a tank to be filled from the dispenser, the simulator comprising a transfer line provided with a pressure controller;

[0029] illustrates an example of a curve giving a time evolution of the resistance of the pressure controller to a flow of fluid through the transfer line of the;

[0030] illustrates an example of a curve giving a temporal evolution of the pressure in a tank being filled from the distributor of the.

[0031] Illustrates an assembly 1 comprising a distributor 2 of pressurized fluid and a simulator 3 of a tank to be filled from the distributor 2. The simulator 3 is connected to the distributor 2 of pressurized fluid. The fluid considered can be hydrogen gas or natural gas.

[0032] The distributor 2 comprises a source of pressurized fluid and a dispensing member connected to the source of fluid by a hose. In particular, the dispensing member of the distributor 2 is configured to be connected to the simulator 3. Furthermore, the dispensing member of the distributor 2 may take the form of a gun.

[0033] In addition, the distributor 2 comprises sensors for measuring a certain number of physical quantities of the pressurized fluid. These sensors may be arranged at the level of the hose connecting the source to the distribution member, or at the level of the distribution member. In particular, the distributor 2 comprises a main flow meter FE0 which is configured to determine the quantity of fluid at the outlet of the distributor 2.

[0034] It should be noted that distributor 2 can be used alone without simulator 3. The distributor is in nominal operation. In this case, the distribution member of distributor 2 can be connected to a tank to be filled.

[0035] The quantity of fluid at the outlet of dispenser 2 is taken into account to estimate the volume of fluid supplied to simulator 3. In nominal operation of dispenser 2, the quantity of fluid at the outlet of dispenser 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 invoiced to the customer of the service station).

[0036] The simulator 3 comprises a fluid transfer line which is in the form of a conduit having a first end and a second opposite end. The first end of the conduit is configured to be connected to the distributor 2, and more specifically to the distribution member of the distributor 2. The fluid passing through the conduit flows from the first end, called upstream, to the second end, called downstream. It should be noted that the conduit may be covered with thermal insulation.

[0037] In particular, the transfer line comprises a pressure controller PCV1, and at least one secondary flow meter FE1, FE2.

[0038] The PCV1 pressure controller presents a resistance to fluid flow. This resistance can vary, resulting in a variation in a flow rate and / or pressure of a fluid stream passing through the transfer line. In other words, the PCV1 pressure controller is configured to regulate the flow rate and / or pressure of a fluid stream passing through the transfer line.

[0039] In particular, the variation in the resistance of the PCV1 pressure controller can lead to an increase in the pressure of the fluid flow upstream of the PCV1 pressure controller, and a decrease in the pressure of this flow downstream of the pressure controller, i.e. after this flow has passed through the PCV1 pressure controller. This is referred to as regulation of the “upstream pressure” of the fluid by the PCV1 pressure controller.

[0040] Alternatively, variation in the resistance of the PCV1 pressure controller may result in an increase in fluid pressure after fluid flow passes through the PCV1 pressure controller. This is referred to as regulation of the “downstream pressure” of the fluid by the PCV1 pressure controller.

[0041] The variation in the resistance of the PCV1 pressure controller to the fluid flow (and therefore the resulting variation in the flow rate and / or pressure of the fluid) makes it possible to reproduce a pressure increase in a reservoir simulated by the PCV1 pressure controller. The PCV1 pressure controller thus acts as a virtual reservoir.

[0042] The PCV1 pressure controller comprises, for example, a flow and / or pressure control valve, having a flow section of variable dimensions. The flow section determines the resistance of the valve to the flow of the fluid. In other words, the flow section determines the pressure of the fluid downstream and / or upstream of the control valve.

[0043] The at least one secondary flow meter FE1, FE2 is configured to measure a quantity of fluid passing through the transfer line. More specifically, the at least one secondary flow meter FE1, FE2 is configured to measure a quantity of fluid passing through the pressure controller PCV1. Thus, the at least one secondary flow meter FE1, FE2 can be arranged upstream or downstream of the pressure controller PCV1.

[0044] In the example shown, the transfer line has a first secondary flow meter FE1 located upstream of the pressure controller PCV1 and a second secondary flow meter FE2 located downstream of the pressure controller PCV1. In the following, the first secondary flow meter FE1 will also be called the “upstream flow meter”. The second secondary flow meter FE2 will also be called the “downstream flow meter”.

[0045] 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 which would have been supplied to the tank thus simulated by the PCV1 pressure controller.

[0046] Thus, the assembly 1, and in particular the second secondary flow meter FE2, can be implemented to determine more precisely the quantity of fluid supplied to a reservoir by the distributor 2, when said reservoir is simulated by a pressure controller PCV1.

[0047] Likewise, the assembly 1, and in particular the second secondary flow meter FE2, can be implemented to verify the reliability of the data determined from the main flow meter FE0 and assumed to represent the volume of fluid delivered to a tank connected to the distributor 2. In other words, the assembly 1, and in particular the second secondary flow meter FE2, can be implemented for metrology, and in particular for legal metrology, in the field of pressurized fluid distributors.

[0048] Due to its function as a standard in relation to the main flow meter FE0, the second secondary flow meter FE2 will also be referred to hereinafter as the “metrological flow meter”.

[0049] Advantageously, the FE2 metrological flow meter is based on a different phenomenon or physical quantity than that associated with the FE0 main flow meter. In other words, the FE2 metrological flow meter and the FE0 main flow meter are of different types and / or technologies. For example, the FE2 metrological flow meter may be of the electromagnetic type. The FE0 main flow meter may be a Coriolis flow meter.

[0050] The choice of the main flow meter FE0 and the metrological flow meter FE2 according to two different types and / or technologies is essential for a legal metrology application. Indeed, when the two flow meters FE0, FE2 are based on the same phenomenon or physical quantity, in the event of a significant difference in the measurements provided respectively by these flow meters, it can be difficult to determine which of these measurements is erroneous.

[0051] In order to enable a more precise measurement of the quantity of fluid passing through the PCV1 pressure controller (and therefore a more precise measurement of the quantity of fluid that would be supplied to a simulated reservoir by the PCV1 pressure controller), it is necessary to provide the FE2 metrological flow meter with better flow measurement accuracy compared to the FE1 upstream flow meter or the FE0 main flow meter.

[0052] To do this, according to the invention, the transfer line has, downstream of the pressure controller PCV1, a portion, called the downstream portion, having a wider section than a portion of the same transfer line located upstream of the pressure controller PCV1. The downstream portion of the transfer line is configured to minimize pressure losses after the flow has passed through the pressure controller PCV1.

[0053] With a relatively lower fluid pressure level at the downstream portion of the transfer line, the FE2 metrological flowmeter located on this downstream portion can be chosen from a range of flowmeters with higher accuracy.

[0054] Advantageously, the accuracy of the FE2 metrological flow meter is less than 0.004%. Such a level of accuracy is generally expected on the measuring means used in a legal metrology procedure applied to a pressurized fluid distributor.

[0055] In order to enable control of the PCV1 pressure controller, the simulator 3 comprises 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.

[0056] The flow measurement used to control the PLC control unit can be provided by the upstream flow meter FE1, or the downstream flow meter FE2. In the second case, the flow meter FE2 then plays an additional function in addition to its metrological function. The flow measurement used to control the PLC control unit 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 FE2.

[0057] In particular, the PLC control member may comprise a servomotor configured to drive the PCV1 pressure controller, and in particular to act on the resistance of the PCV1 pressure controller according to a predefined setpoint. Furthermore, the PLC control member may comprise an electronic control unit comprising a programmable microprocessor and / or display means and / or input means.

[0058] In particular, the microprocessor is configured to receive all or part of the signals from the sensors or measuring devices such as the upstream flow meter FE1 or the downstream flow meter FE2, then send a second signal to the servomotor.

[0059] Illustrates an example of an AS setpoint sent by the PLC control unit to the PCV1 pressure controller. Here, the PCV1 pressure controller is formed by a valve. The AS setpoint consists of a QN curve giving a temporal variation of the valve's flow section between a maximum value QM marking the start of fluid flow in an initially empty tank and a minimum value marking the end of flow in the tank filled to its maximum.

[0060] The mathematical model mentioned above is obtained from a filling test carried out on a tank connected to distributor 2.

[0061] This model includes, for example, a PN curve giving a temporal evolution of the pressure PH of the fluid at the outlet of the distributor (see). This evolution can be linear and increasing from an initial pressure RD of the tank to a maximum value PM. The initial pressure can be higher than atmospheric pressure.

[0062] In addition, this model may include a curve (not shown) giving a temporal evolution of the flow rate of the fluid at the outlet of the distributor 2. This evolution may be non-linear and decreasing from a maximum value marking the start of filling to a minimum value marking the end of filling.

[0063] 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.

[0064] From the correlation curve between the pressure PH and the flow rate of the fluid at the outlet of the fluid source, and thanks to a flow rate measurement given by the upstream flow meter FE1 and / or the downstream flow meter FE2, it is possible to determine a theoretical value of the fluid pressure at the level of the pressure controller PCV1. On the basis of this theoretical pressure value, the PLC control unit acts on the resistance of the pressure controller PCV1 (for example according to the setpoint illustrated in) so as to establish the flow rate which passes through this pressure controller PCV1 at a predetermined value, provided by the pressure / flow rate correlation curve.

[0065] As the fluid flow continues through the transfer line, the PN curve giving the time evolution of the pressure PH can be used to determine at each instant a value of the fluid pressure at the PCV1 pressure controller. The resistance of the PCV1 pressure controller is adapted accordingly (for example according to the setpoint illustrated in) to reduce the flow rate of the fluid passing through the PCV pressure controller to a predetermined value, provided by the pressure / flow correlation curve.

[0066] It should be noted that to regulate the resistance of the PCV1 pressure controller, the PLC control unit can rely on a curve giving a correlation between the estimated fluid pressure at the PCV1 pressure controller and the resistance of this same PCV1 pressure controller. Such a curve can be used instead of the setpoint illustrated in.

[0067] 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 presumed 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. Such a comparison makes it possible to establish the reliability of the first quantity of fluid.

[0068] Advantageously, the transfer line comprises upstream of the PCV1 pressure controller a PT pressure sensor and / or a TT temperature sensor. These PT, TT sensors are connected to the PLC control unit and possibly make it possible 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 formed by a control valve, the TT, PT sensors make it possible to correct the opening of the passage section of said valve.

[0069] Advantageously, the simulator 3 comprises a receptacle 4 intended to collect the fluid which circulates through the transfer line.

[0070] In particular, the receptacle 4 may be connected to the fluid distributor 2 by a return conduit for the purpose of reusing the fluid in the distributor 2. Alternatively, the receptacle 4 may be connected to an ambient environment for the purpose of venting the fluid. In both cases, the transfer line may be equipped with a second pressure controller PCV2 which is positioned, as the case may be, between the receptacle 4 and the distributor 2 or between the receptacle 4 and the ambient environment.

[0071] In the case of fluid communication between the receptacle 4 and the distributor 2, the second pressure controller PCV2 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.

[0072] Receptacle 4 can be positioned upstream and / or downstream of the FE2 metrological flow meter.

[0073] When positioned upstream of the FE2 metrological flow meter, the receptacle 4 collects a volume of fluid which is likely to generate uncertainties in the measurement made by the FE2 metrological flow meter. In order to correct such uncertainties, the receptacle 4 upstream of the FE2 metrological flow meter can be equipped with a TT temperature sensor and / or a pressure sensor.

[0074] When it is placed downstream of the FE2 metrological flow meter, the receptacle 4 makes it possible to stabilize the pressure to which this FE2 metrological flow meter is subjected.

[0075] It should be noted that the receptacle 4 may be of type I or II with a more limited capacity (for example 100L) to allow for faster depressurization. In other words, the receptacle 4 is not necessarily of the same type as a test tank (generally type III or IV) used for example in a legal metrology procedure according to the prior art.

[0076] Advantageously, the transfer line may comprise a non-return valve CV allowing a flow of fluid in one direction, i.e. from the distributor 2 to the pressure controller PCV1.

[0077] Advantageously, the transfer line may comprise a safety valve PSV and / or an automatic valve FV intended to protect the simulator 3 in the event of a malfunction. More specifically, the safety valve PSV and / or the automatic valve FV protect the simulator 3 in particular when the temperature, pressure or flow rate (measured respectively by the temperature sensor TT, the pressure sensor PT or the at least one secondary flow meter FE1, FE2) exceeds a maximum authorized threshold.

[0078] In the event of a malfunction, the control unit (PLC) is configured to emit an alarm signal announcing a shutdown of the simulator 3.

Claims

Assembly (1) comprising a distributor (2) of pressurized fluid 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 flow 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 main flow meter (FE0) and a secondary flow meter (FE2), the main flow meter (FE0) being configured to estimate a first quantity of a fluid flow supplied to the pressure controller (PCV1) and therefore to the simulated tank by the pressure controller (PCV1), the secondary flow meter (FE2) being arranged 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 therefore to the reservoir simulated by the pressure controller (PCV1),characterized in that the simulator (3) comprises a programmable electronic control member (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., Assembly (1) according to the preceding claim, characterized in that the pressure controller (PCV1) is configured to increase the pressure of the fluid flow upstream of the pressure controller (PCV1), and decrease the pressure of the fluid flow after the fluid flow has passed through the pressure controller (PCV1). Assembly (1) according to any one of the preceding claims, characterized in that the transfer line has, downstream of the pressure controller (PCV1), a portion, called the downstream portion, of greater cross-section than a cross-section of a portion of the transfer line located upstream of the pressure controller (PCV1), the downstream portion being configured to minimize pressure losses after the fluid has passed through the pressure controller (PCV1), the secondary flow meter (FE2) being arranged at the downstream portion. Assembly (1) according to any one of the preceding claims, characterized in that the secondary flow meter (FE2) is more precise than the main flow meter (FE0). Assembly (1) according to the preceding claim, characterized in that the precision of the secondary flow meter (FE2) is less than 0.004%. Assembly (1) according to any one of the preceding claims, characterized in that the secondary flow meter (FE2) is based on a phenomenon or physical quantity different from a phenomenon or physical quantity associated with the main flow meter (FE0). Assembly (1) according to any one of the preceding claims, characterized in that the electronic control member (PLC) is configured to modify a resistance of the pressure controller (PCV1) to the flow of fluid passing through the transfer line, and thus modify the pressure of the flow of fluid passing through the transfer line, the electronic control member (PLC) being controlled using a mathematical model and at least one of the following data measured on the flow of fluid passing through the transfer line: flow rate, temperature or pressure. Assembly (1) according to the preceding claim, characterized in that the flow rate data is measured by the secondary flow meter (FE2) located downstream of the pressure controller (PCV1) or by an additional flow meter (FE1) located upstream or downstream of the pressure controller (PCV1). Assembly (1) according to any one of claims 7 or 8, characterized in that the pressure data is measured by a pressure sensor (PT) arranged upstream of the pressure controller (PCV1). Assembly (1) according to any one of claims 7 to 9, characterized in that the temperature data is measured by a temperature sensor (TT) arranged upstream of the pressure controller (PCV1). Assembly (1) according to any one of the preceding claims, characterized in that the transfer line comprises a safety valve (PSV) and / or an automatic valve (FV) configured to protect the simulator (3) in the event of a malfunction. Assembly (1) according to any one of the preceding claims, characterized in that the transfer line comprises a non-return valve (CV) configured to ensure a flow of fluid from the station (3) to the pressure controller (PCV1), and prevent a flow of fluid in the opposite direction. Assembly (1) according to any one of the preceding claims, characterized in that the transfer line comprises a receptacle (4) allowing recovery of the fluid and / or more precise and stable control of the pressure to which the secondary flow meter (FE2) is subjected. Use of an assembly (1) according to any one of claims 1 to 14, for metrology, and in particular for legal metrology, in the field of pressurized fluid distributors, and in particular for controlling the reliability of measurements provided by a pressurized fluid distributor.

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