HMI FEATURES

The HMI or Human Machine Interface provided by Seven Sensor is programmed in Macro codes and designed with three screens:

Soiling Ratio screen: This screen allows to see the soiling ratio in (%). If the difference between the two sensors is greater than 10% (this value can be changed as per buyer requirements), the Red LED lights up to warn the user to clean the panels, Otherwise the Green LED lights up.

Data Recorder: This screen allows the end user to retrieve all the data recorded during the measurement, either in PDF or Excel format.

Data can be taken for 1 hour, 6 hours, or more.

After recording the Data, retrieve them either in PDF Format or Excel Format.

Soiling Ratio Graph; This screen allows to view the results of the soiling Ratio in graphical form.

TEST & CALIBRATION

The soil monitoring system is tested before delivery. The two Irradiance sensors were calibrated under natural sunlight and compared with a calibrated reference cell at Fraunhofer-institut für Solare Energiesysteme ISE, Germany. As per the IEC 61724-1 the Soiling Ratio Calibration should be repeated at least annually.

COMMUNICATION & INSTALLATON

The communication between the two irradiance sensors and the PLC is done through a Modbus RTU protocol, so that the data collected goes directly from the sensors to the PLC. The diagram below explains how to install the soil monitoring system:

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