Vacuum Controller

Welch offers programmable vacuum controllers for process control in the rough vacuum range 1100 to 1 mbar. Controlled pressures and processes guarantee high reproducibility and recovery yields in distillation processes. Furthermore, controlled processing leads to significantly lower operation costs and less environmental damage. Measuring sensors and electromagnetic ventilation valves can be externally mounted as a complete building group. They belong to the scope of supply of the controller.

The connections are available in different lengths, max. 5 m. The vacuum control box VCB 521 is available in four types to allow the control of different vacuum sources.

• VCB 521 cv: with pressure control by control valve integrated at the box
  
• VCB 521 ef: with pressure control by an analog output for the control of an external speed adjusted vacuum pump (ecoflex)
  
• VCB 521 en: with pressure control of an external vacuum pump by on/off circuit of the motor (economic)
  
• VCB 521 es: with external sensor and ventilation valve for the regulation of the vacuum by an optional control valve or over an analog output for the control of an external speed adjusted vacuum pump (ecoflex) or an external vacuum pump by on/off circuit of the motor (economic).