The Supply, Installation And Commissioning Of A Calibration Chain For Pyranometers And Pyrheliometers In Two (02) Lots (Hay Hassani District Prefecture). Lot N°01: Supply, Installation And Commissioning Of An Automatic Calibration System For Pyranometers. Lot N°02: Supply, Installation And Commissioning Of An Automatic Calibration System For Pyrheliometers (EXPIRED)