Control device for regulating the pressure of a fluid

A porometer, comprising:

• a device for holding a sample to be measured;
• and
• a control device for controlling a pressure of a fluid, which is arranged upstream of the sample to be measured and pressurizes the sample to be measured with a fluid under defined pressure conditions, wherein the control device comprises:
• a pipe system for conveying a fluid, the pipe system having an inlet and an outlet and the fluid flowing in the pipe system from the inlet to the outlet,
• a regulating unit associated with the pipe system, which comprises:
• at least two pressure regulators, which comprise a first pressure regulator and a second pressure regulator, the first and second pressure regulators each generating a regulating variable for an actuator to configure the flow of the fluid in the pipe system, and
• a controller, wherein
• the first pressure regulator is arranged on an inlet side of the pipe system,
• the second pressure regulator is arranged in series downstream of the first pressure regulator with respect to a direction of flow of the fluid in the pipe system, and
• the controller is configured to specify a respective pressure setpoint value as a reference variable for the first pressure regulator and the second pressure regulator.