Shown is the diagram of a system circuit of several technical components. On the left side you can see the symbol for a CO2 pressure vessel. On the right side there is a pipeline which, separated by a valve, connects the tank with the switching symbol for a compressor. Moving further to the right, again connected to a pipeline, a heater is symbolically arranged. Keeping the direction, the heater is followed by a so-called test module, which is represented by a rectangle. Both the incoming and the outgoing pipeline have a valve. The pipe that branches off to the right makes two bends, so that the following components are arranged below those described so far.
The block diagram of a cooler is shown below the last described experimental module. This is connected to the left with a pipeline with another experimental module. The pipe leading off from it is connected with a bend upwards to the pipe section between CO2 pressure vessel and compressor, so that the circuit is closed.