The role of this test bench is the analysis and quality control of gas cylinders used in metallurgical industries, chemical, petrochemical, pharmaceutical and food industry.
The control system of gas is functionally decomposed as follows:
  1. Entering management and production information of gas
  2. Measuring the gases composition,
  3. Analysis of measures and results,
  4. Archiving data to a remote database.
The bench contains the following elements:
  1. Gas delivery system,
  2. Measurement instrumentation,
  3. Acquisition and control central,
  4. Management and supervision software.
Supervision software for analyzing gas written in LabVIEW
User interface of the supervision software for the gaz analysis bench

Harware technology

The supervision software is installed on a PC. The acquisition and control central is composed of Compact Fieldpoint modules of National Instruments. Gas analyzers are Emerson Process.

centrale d'aquisition et de commande compact fieldpoint

Compact Fieldpoint acquisition central and its cards

The supervisor, on the PC, is linked to central by a serial link (RS232). The central commands 0/24V switches to route gas to the analyzer. The central commands analyzers by 4-20mA.

Software technology

Operating system: MS Windows XP
Supervisor programing: Graphical programation with LabVIEW of National Instruments
Database: remote managed by WinDev
Supervisor-remote database comunication: Citrix network via FTP gateway

How does it work?

The analysis of a gas is performed by a measuring instrument called analyzer. This analyzer detects only certain chemical compounds. Therefore, to test several gas, it takes several analyzers.
The bench is composed nine analytical analyzers. To test the quality of a gas, it must send it to the analyzer which is sensitive to its characteristics.
The gas analyzers are routed through a network of pipes. By actuating the valves manually or by the supervision software, it is possible to direct gas.

What is LabVIEW?

LabVIEW LabVIEW is a development environment specialized in industrial and scientific applications. Its uniqueness is that it relies on the G language, created by National Instruments, which is fully graphical. It can create complex software, while facilitating the programming and thus reduce development time. Through its library of functions for data acquisition, instrumentation, analysis of mathematical measures, but also through the rapid creation of GUIs and coding simplified, the engineer has more time to focus on specific functions of the instrumentation communication and measurement analysis.

LabVIEW is particularly suitable for developing control, supervision, test and measurement systems.

What is LabWindows/CVI?

LabWindows/CVI LabWindows is a development environment in C language for the implementation of test systems, measurement and instrumentation. Thus, it is possible to enjoy both the power and precision of the C language but also libraries of functions for instrumentation and signal processing from National Instruments.

With LabWindows / CVI, you can develop:

  • software for Windows (exe) or UNIX Linux,
  • libraries (DLL, Active X,. NET),
  • instrument drivers,
  • on embedded targets,
  • on real-time target.

What is Measurement Studio

Measurement Studio pour Visual Studio C++, C# et Visual Basic These are libraries of graphical controls and functions for the rapid development of industrial or laboratory solutions containing .NET technology used directly in Visual Studio, to have power tools National Instruments software and instrumentation functions for C++ , C# or Visual Basic.

What is TestStand

TestStandTestStand is a instruction sequences engine and a development environment for creating a test sequencer evolved several common test for different products. We have a generic software that loads, as the test product, sequences specifying actions, tests and tolerances, and components (such as DLLs) for communication with the hardware.