KNF Vacuum Pump System SC 920

KNF Vacuum Pump System SC 920
Article no longer available, is replaced by SC 920 G

Features

• Fast and precise evaporation/distillation and autom. sensing of the boiling point
• Ease of operation; the process parameters are entered using a touchscreen and a rotary knob
• Quiet operation
• Sensitive pressure control in the system
• Variable systempressure via speed regulation
• high recovery rates even with low boiling point solvents
• Environmentally friendly
• Low maintenance-free
• Capturing of particles in the system (suction side)

Applications

• Vacuum evaporation
• Vacuum desiccation
• Vacuum gel drying
• Vacuum filtration

Enter process para meters via thehand terminal
The new vacuum pump system SC 920 now supports remote control over a portable hand terminal, thus ensuring maximum flexibility in the laboratory. Fast process times and high precision are further outstanding features of this new product. These days, it is hard to imagine modern laboratories without controller-operated vacuum pump systems. They deliver precise vacuum and offer widely diverse control functions for a huge range of applications in the laboratory. The intuitive user guidance on the hand terminal ensures ease of operation; the process parameters can be entered over a touchscreen and a rotation knob. The various menus to enter

Ajustment capabilities

• Units of measurement
• The operating language
• The operating mode
• Parameters, such as the setpoint pressure or suction capacity of the system direct over rotation knob.

Depending on the selected operating mode, the graphic display of the hand terminal then indicates the respective process variables. The user can intervene in the ongoing process at any time with the hand terminal and its integrated touchscreen and rotating knob. The hand terminal can be located via vacuum pump system (paging); the hand terminal will answer with a signal tone.

Four operating modes
The vacuum pump system can be used in four different operating modes, selected on the hand terminal:

• Evacuate
  • The vacuum pump system evacuates a vacuum chamber with adjustable pump capacity.
• Pressure control
  • The vacuum pump system controls the system pressure to the set value (constant pressure).
• Automatic
  • The vacuum pump system automatically finds the vapour pressure of the sample and adjusts the process pressure accordingly.
• Individual pressure function
  • The vacuum pump system controls the process according to a user-defined pressure curve. The setpoint pressure and the opening and closing of the coolant valve (accessory) on the high-performance condenser can be easily entered for a range of set times. A repeat function allows successive repetitions of the programmed pressure curve.At any time during an active process, you can switch to manual process control. Functions for Evacuate and Pressure control will be available simultaneously.

Intelligent control
A key feature of the SC 920 vacuum pump system is its intelligent control system. A pressure sensor measures the actual pressure in the system several times per second, and a microprocessor monitors any pressure drop over time. The pump speed is adapted according to this information constantly. At the start of each process, the vacuum pump operates at low speed to avoid over-response in situations with a small vacuum chamber volume and a fast-boiling medium. If there is a large discrepancy between the actual pressure and the setpoint pressure, the pump speed, and thus the transferred volume, is increased in order to speed up the process. As soon as the actual pressure approaches the setpoint pressure, the pump speed is reduced. This ensures fast process times and high control accuracy.

Controlling via a PC
Included in delivery with the SC 920 is Windows®-based software, which also supports operation of the system over a PC. In addition to the options offered by the hand terminal, the software also supports the display of the pressure curves as a chart (setpoint/actual shown), setpoint can be saved, and the export of data to spreadsheets or text files. Communication with the PC is implemented over a USB interface.

Fast process times
Besides intelligent control, the diaphragm vacuum pump used in the SC 920 further contributes to short process times. The pump is fitted with the patented KNF diaphragm system that ensures high suction speeds even at low pressures. The vacuum pump system achieves an ultimate vacuum of 2 mbar absolute and delivers up to 20 liters of gas per minute. All gas carrying parts are manufactured from chemical resistant materials.

Extremely quiet operation
The integrated vacuum pump operates extremely quietly. Furthermore the system stops the pump completely as soon as the setpoint pressure of the system is reached and only starts up again intermittently in order to offset any slight drop in pressure due to leakages in the process equipment.

Perfectly matched components
This vacuum pump system SC 920 opens up a whole new range of options in the laboratory. This is due to new functions and technical solutions. Thanks to the coordinated development of the individual components it has been possible, for example, to adjust the sensitivity of the motor to suit the requirements of the control process.