The Sorvall RC-28S Refrigerated Centrifuge offers top performance for a wide range of protocols, economy in use, safety, and convenience. Microcomputer-Controlled, the RC-28S offers speeds to 28,000 rpm and RCF to 100,500 x g . This extra performance capability enables you to perform all superspeed protocols as well as many low-end ultraspeed protocols a cost-effective alternative to operating two centrifuges.Features of the Sorvall RC-28S include:• Versatility- Can be used with most SORVALL superspeed rotors, • Space-savings- Requires less floor space than conventional superspeed and ultraspeed centrifuges, Retractable chamber door eliminates clearance problem, • Reliability-Unique SPIN-RIGHT rotor management system ensures safe operation and optimal control of conditions, - w2dt for run-to-run reproducibility, - Rotors specifically designed and independently tested for biocontainment, ·Drive system; high-torque, cogless, brushless DC direct drive; 2.2kw (3hp),·Braking system; positive action to 0 rpm,·Refrigeration system; high-capacity, CFC-free,·Set speed range; 100 to 28,000 rpm,·Speed control accuracy; ±10 rpm up to 2,000 rpm, ±0.5% of set speed > 2,000 rpm,·Temperature set range; -20ºC to 40ºC,·Temperature control range ; 2ºC to 40ºC at max. speeds; can be extended at reduced speeds,·Temperature control accuracy; ±1ºC (from 2ºC to 40ºC after stabilization),·Sample temperature stability; ±1ºC at equilibrium, ·Automatic or manual control,·Automatic imbalance detector; protect from gross imbalance,·Timer; digital; 0 to 99 hr, 59 min or HOLD,·And programmability; 20 programs