Analysis system for a process, having: - operable bypass module for taking a liquid sample from the process, connected to - operable liquid sample preparation means (108; 302, 304, 306, 307, 308, 310, 312, 314, 316, 317, 318), connected to - operable means for analysing the sample, connected to - means for transmitting an analysis result to a process control system (118, 120), - a control unit, and - the operable liquid sample preparation means being organised in different modules (M1, M2, M3,...), a particular functionality being realized by way of each of the modules, and individual modules of the liquid sample preparation being operable by the control unit, - a liquid sample preparation module having a mixing vessel, - the bypass module being connected to the control unit, characterized in that - the control unit has a control program and driver programs for the operation of the modules of the liquid sample preparation means, the control program accessing the driver programs respectively assigned to one of the modules in order to control the procedure of the sample taking, the liquid sample preparation and the sample analysis, and - a user interface for inputting an analysis sequence to a computer, the user interface being designed in such a way that a program procedure of the control program is determined by selecting representations of the modules and inputting the actions to be carried out by the selected modules to the computer, and the computer comprising means for exporting data describing the analysis sequence for the control program, - the data describing the analysis sequence serving as a parameterization for the control program, so that the latter addresses the respectively required driver programs in the necessary order. - operable bypass module for taking a liquid sample from the process, connected to - operable liquid sample preparation means (108; 302, 304, 306, 307, 308, 310, 312, 314, 316, 317, 318), connected to - operable means for analysing the sample, connected to - means for transmitting an analysis result to a process control system (118, 120), - a control unit, and - the operable liquid sample preparation means being organised in different modules (M1, M2, M3,...), a particular functionality being realized by way of each of the modules, and individual modules of the liquid sample preparation being operable by the control unit, - a liquid sample preparation module having a mixing vessel, - the bypass module being connected to the control unit, - the control unit has a control program and driver programs for the operation of the modules of the liquid sample preparation means, the control program accessing the driver programs respectively assigned to one of the modules in order to control the procedure of the sample taking, the liquid sample preparation and the sample analysis, and - a user interface for inputting an analysis sequence to a computer, the user interface being designed in such a way that a program procedure of the control program is determined by selecting representations of the modules and inputting the actions to be carried out by the selected modules to the computer, and the computer comprising means for exporting data describing the analysis sequence for the control program, - the data describing the analysis sequence serving as a parameterization for the control program, so that the latter addresses the respectively required driver programs in the necessary order.