I was able to find the following information in regards to this centrifuge from [url=http://www.kitmondo.com/ViewListing.aspx?lid=64357&prodName=Fisher_235C-Microcentrifuge]kitmondo[/url].
The model 235C operates at a fixed speed of 12,400rpm and produces 13,600xG. Full speed is achieved in less than six seconds, even with a full load. The combination TIME/ON/OFF switch has a range of 0 to 40 minutes, with a full load.
Good luck with your research!