Coffee beans roasting system comprising: - a coffee beans roasting apparatus, said apparatus comprising:. a chamber dedicated to roasting of coffee beans,. a heating device to supply a flow of hot air to the chamber,. at least one first temperature probe to regulate the temperature of air supplied by the heating device, said first temperature probe being positioned outside the chamber,. a control system configured to control the heating device and configured to reproduce roasting curves each of said roasting curves providing a set of points (T @ti; ti) representing the temperature to be applied at discrete successive times t i, respectively, said control of the heating device being based on the temperature Treg regulated by the at least one first temperature probe, characterised in that it further comprises: - at least one second temperature probe configured to be introduced temporary inside the roasting apparatus to measure the temperature inside the roasting chamber, and - at least one means configured to create a pressure loss of the flow of hot air while the chamber is void of coffee beans in order to simulate the presence of coffee beans inside the chamber during a roasting operation. - a coffee beans roasting apparatus, said apparatus comprising:. a chamber dedicated to roasting of coffee beans,. a heating device to supply a flow of hot air to the chamber,. at least one first temperature probe to regulate the temperature of air supplied by the heating device, said first temperature probe being positioned outside the chamber,. a control system configured to control the heating device and configured to reproduce roasting curves each of said roasting curves providing a set of points (T @ti; ti) representing the temperature to be applied at discrete successive times t i, respectively, said control of the heating device being based on the temperature Treg regulated by the at least one first temperature probe, characterised in that it further comprises: - at least one second temperature probe configured to be introduced temporary inside the roasting apparatus to measure the temperature inside the roasting chamber, and - at least one means configured to create a pressure loss of the flow of hot air while the chamber is void of coffee beans in order to simulate the presence of coffee beans inside the chamber during a roasting operation.. a chamber dedicated to roasting of coffee beans,. a heating device to supply a flow of hot air to the chamber,. at least one first temperature probe to regulate the temperature of air supplied by the heating device, said first temperature probe being positioned outside the chamber,. a control system configured to control the heating device and configured to reproduce roasting curves each of said roasting curves providing a set of points (T @ti; ti) representing the temperature to be applied at discrete successive times t i, respectively, said control of the heating device being based on the temperature Treg regulated by the at least one first temperature probe, characterised in that it further comprises: - at least one second temperature probe configured to be introduced temporary inside the roasting apparatus to measure the temperature inside the roasting chamber, and - at least one means configured to create a pressure loss of the flow of hot air while the chamber is void of coffee beans in order to simulate the presence of coffee beans inside the chamber during a roasting operation. - at least one second temperature probe configured to be introduced temporary inside the roasting apparatus to measure the temperature inside the roasting chamber, and - at least one means configured to create a pressure loss of the flow of hot air while the chamber is void of coffee beans in order to simulate the presence of coffee beans inside the chamber during a roasting operation.