Lukas,

SystemModeler has built in units for VolumeFlowRate so you can get the same functionality that is built in for mm with volumeflowrates. You need to declare your parameter or variable as follows:

parameter Modelica.SIunits.VolumeFlowRate vol(displayUnit = "m3/min") "Volume Flow";

or for a variable:

Modelica.SIunits.VolumeFlowRate vv;

-- VolumeFlowRate is a data type.

That is the good news.

The bad news is that WSM only seems to support units of m^3/s, m^3/min, m^3/hour, m^3/day, or l/s. If you want l/min or ml/min you will need to request it from the MathCore people in Sweden -- However, they have been responsive in the past and I have had them add units for me (ie mW and kW in Power for example).

Regards

Neil