It is planned to install extra sensors for solar radiation, ambient and system temperatures, mass flow measurement and operating hours of pumps. Figure 4 shows the placement of the sensors in a schematic system. In nearly all solar systems that are chosen, an electronic control exists so that it will be tried for some systems to get additional data from the control. In these systems only at those points where there are no sensors of the control, extra sensors will be installed (e. g. mass flow sensor in the solar circuit).

For detailed measurements of the collector field two systems will be equipped with additional sensors at certain points in the collector field.