"We are not in a rush. The second generation of centrifuges will be mass-produced in the next few months," Salehi said in an interview with Iran's state-run tv on Saturday evening.
Pointing to the newly unveiled sample of the third generation of home-made centrifuges, Salehi stated that the process for injecting gas into the third generation of Iran-made centrifuges, unveiled yesterday, would also start within the next few months.
"We may need a year of time before we can arrange a cascade (of third-generation centrifuges) for testing.
"The second generation will stop (working) when the third generation's assessments are completed and the machines are mass-produced," the Iranian official said.
"Only then we can make use of the third generation (of centrifuges)," Salehi went on saying.
Iran unveiled the country's new advances in the field of peaceful nuclear technology at a ceremony held in Tehran on Friday marking the National Day of Nuclear Technology.
Speaking at the ceremony, Salehi announced that Iranian scientists have managed to design a first sample of the third generation of home-made centrifuges.
"Our skillful colleagues at the Atomic Energy Organization of Iran have also succeeded in designing third-generation machines thanks to God," Salehi stated.
"The (third-generation) machines have accomplished their mechanical tests. We expect that God willing the machines would show the separation capacity of approximately 10 after the upcoming phase of gas injection," the official stressed.
"That capacity is almost 6 times more that the separation capacity in the first generation machines," Salehi continued.
Commenting upon the second generation of home-made centrifuges, Salehi stressed that the machines have already been manufactured and tested successfully, and said IR2 centrifuges have the separation capacity of 5, three time more that the first generation.