Method for operating and in particular monitoring a scroll pump, with the steps of: producing a vacuum by means of the scroll pump; determining a pressure of the scroll pump; comparing the recorded pressure with a pre-set threshold value; and if the recorded pressure lies above the pre-set threshold value, emitting a warning signal. The invention furthermore concerns a scroll pump for executing the method.

A control system comprising: a liquid ring pump; a motor configured to drive the liquid ring pump; and a controller configured to: determine an electrical current within the motor; determine a speed of the motor; calculate a value of a function, the function being a function of the determined electrical current within the motor and the determined speed of the motor; and output one or more control signals based on the calculated value of the function.

A control system comprising: a liquid ring pump; a motor configured to drive the liquid ring pump; and a controller configured to: determine an electrical current within the motor; determine a speed of the motor; calculate a value of a function, the function being a function of the determined electrical current within the motor and the determined speed of the motor; and output one or more control signals based on the calculated value of the function.