Benchmark™ Overhead Stirrers

Overview Benchmark’s Overhead Stirrers feature high torque and advanced digital microprocessor control for smooth mixing of low and medium viscosity samples. Speed and run time are accurately set and monitored on the LCD screen. Both the 20L and 40L capacity models are supplied with a 4 arm stainless steel propeller. Additional steel and Teflon impellers are available. A feed-through chuck holds accessory shafts firmly in place and is easily tightened and loosened without tools. The overhead stirrers are protected from damage by sensors that shut down operation in the case of high viscosity or obstruction, while a splash cover protects the connection mechanism from potential corrosion. Unlike most mixers, the Benchmark series is also supplied with a support stand and mounting hardware. The stirrer easily and securely attaches to the stand for compatibility with a variety of vessels, up to 24 inches high. Features: LCD control panel All-inclusive! Includes complete stand assembly and 4-arm stainless steel propeller Compact and quiet Digital accuracy and convenience Key Attributes Maximum volume (L): OS 20L: 20 L (water)OS 40L: 40 L (water) Minimum Volume (L): N/A Speed max (rpm): OS 20L: 2200 rpmOS 40L: 2200 rpm Speed min (rpm): OS 20L: 30 rpmOS 40L: 30 rpm Max temperature (◦C): N/A Plate:  N/A Plate material: N/A Torque max (Ncm): OS 20L: 40OS 40L: 60 Controls: Digital Timer: Yes Programmable: No Reverse rotation: No Warranty (years): 2 Weight (lbs): OS 20L: 5.7 lbsOS 40L: 6.2 lbs Manufacturer Specifications Model: OS-20L / OS-40L Mixing Capacity (H20): 20L / 40L Maximum Torque: 40Ncm / 60Ncm Input Power: 60W / 120W Output Power: 50W / 100W Net Weight (Mixer): 2.6kg / 2.8kg Maximum Viscosity: 10000mPas / 50000mPas Speed Range: 30-2200 rpm Motor Type: DC brushless motor Chuck Diameter Range: 0.5-10mm Exterior Dims.: (WxDxH) 7.3 x 3.3 x 8.7 in. / 18.6 x 8.3 x 22.0 cm. Protection Mode: IP42 Ambient Operating Range: 5-40°C Electrical: 100-240AC 50-60Hz Warranty: 2 years