The Surveyor LC Pump Plus is a dual column pump with a quadruple, low pressure based mixing system that features an integrated vacuum degasser and pulsation dampener. The pumping system allows flow rates from 0.001 to 9.999 mL/min and can precisely control gradients from 0.200 to 2.000 mL/min. The vacuum degasser works efficiently and requires only 500 µL volume, while the pulsation dampener ensures stable flow rates and only adds 400 µL gradient delay volume to the system. The Surveyor LC Pump Plus is a module of the Surveyor HPLC system. Specifications:. Type: Specifications Minimum flow rate: 0.001 mL/min isocratic, 0.100 mL/min gradient. Maximum flow rate: 9.999 mL/min. Flow rate accuracy: ±2% or ±2 µL/min, whichever is greater, when pumping water at 0.100 to 5.000 mL/min and 10 to 400 bar at 20°C. Flow rate precision: ±0.3% when pumping water at 0.100 to 5 mL/min, 10 to 400 bar, 20°C. Pressure range: 0 to 400 bar (0 to 5800 psi). Operating range: 10 to 400 bar (145 to 5800 psi). Pressure resolution: 0.01 bar (0.15 psi). Solvent capacity: four times. Mixing accuracy: ±1%—for binary gradient—at 1000 µL/min. Flask volume: 48 µL main flask, 24 µL secondary flask. Gradient delay volume: 785 µL. Degasser type: vacuum membrane. Degasser capacity: 4 channels. Degassing volume: < 500 µL per channel. Pulsation dampener: 400 µL. Wet components: 316 stainless steel, PEEK, ruby, sapphire, Teflon, Hastelloy C, GFP. Remote control: Ethernet interface to the data processing computer. Dimensions (H × W × D): 7.1 inches × 14 inches × 18.5 inches. Operating temperature: +10 °C to +40 °C. Storage temperature: -40°C to +70°C. Operating Humidity: 5 to 95% relative humidity, non-condensing Labprocure is responsible for this device.