Beckman L7-75 Ultracentrifuge, 208-240 volt In Ramsey, MN, USA (CAT#: STEM-LCPO-0261-YJL)

Beckman L7-75 Ultracentrifuge, 208-240 volt In Ramsey, MN, USA, model L7-75, is manufactured by Beckman - Coulter laboratory centrifuges.
The Beckman L7-75 is a high-performance ultracentrifuge designed for laboratories with no-compromise centrifugal needs and budget-minded users. The L7 drive system is today’s advanced version of the Beckman drive that revolutionized ultracentrifugation.
The Beckman L7-75 centrifuge is equipped with a frequency-controlled direct drive that provides long-term reliability by eliminating brushes. Along with this, the Beckman centrifuge also has gears and fluid-drive pumps, as well as major maintenance and wear-points on other drives. Designed to eliminate high-speed vacuum seal, the L7-75 ultracentrifuge carries a vacuum-encased induction drive which reduces heat output to 6150 Btu/hr and noise output to less than 60dB.
The simplified drive design of the Beckman L7-75 ultracentrifuge and the efficient use of energy result in the fastest acceleration/deceleration times in its class, as the system requires only 7.35 minutes to accelerate the 60Ti rotor and 6 minutes to decelerate.

Condition: Used
Height: 53.3 cm (21 in)
Depth: 58.4 cm (23 in)
Weight: 81 kg (178 lb)
Approximate acceleration time: 10 acceleration profiles–9 slow rates from; 0 to 5,000 rpm followed by full acceleration to set speed;; or maximum acceleration
Approximate deceleration time: 11 deceleration profiles–10 slow rates from 5,000 to 0 rpm,; including coasting to a stop without brake;; or full dynamic braking from set speed
Electrical requirements: 50 Hz, 198 to 254 VAC, 6 A
Maximum heat dissipation into room under steady-state conditions: 0.5 kW (1,750 Btu/hr)
Noise level 1 meter in front of centrifuge: < 60 dBA
Set speed: Actual rotor speed ± 50 rpm of set speed
Set temperature: 2 to 40°C in 0.1° increments
Set time: to 99 hr 59 min
Speed range: 5,000 to 120,000 rpm
Temperature control: ± 2°C of set temperature; (after equilibration)
Ambient temperature range: 15 to 35°C ambient
Clearances required: 7.6 cm (3.0 in) both sides and rear
Humidity restrictions: < 95% (noncondensing
Pollution degree: 2
Time – actual display: Indicates run time remaining

Vacuum-encased induction drive
Timed runs up to 9 hours and 59 minutes
Choice of cooling systems
Rotor imbalance detection

Beckman Coulter J-25I, 25,000 rpm In Woonsocket, RI, USA (CAT#: STEM-LCPO-0229-YJL)
Beckman Coulter J-30I, 30,000 RPM In Woonsocket, RI, USA (CAT#: STEM-LCPO-0231-YJL)
Beckman Coulter L8-80MW, 80000 rpm In Woonsocket, RI, USA (CAT#: STEM-LCPO-0233-YJL)
Beckman Coulter J2-HC In Woonsocket, RI, USA (CAT#: STEM-LCPO-0240-YJL)
Beckman J6-MI High Capacity Centrifuge Series, 6,000 rpm In Ramsey, MN, USA (CAT#: STEM-LCPO-0247-YJL)
Beckman Instruments J2-21 Centrifuge, 21,000 rpm In Elkin, NC, USA (CAT#: STEM-LCPO-0248-YJL)
1992 Beckman Coulter J6-MI, 6,000 rpm In Woonsocket, RI, USA (CAT#: STEM-LCPO-0256-YJL)