Vacuum regeneration adsorption dryers with a programmable logic controller linked to a dewpoint measuring instrument with a view to load dependent control represent the present day standard version. The possibilities offered by this type of control system have been described in detail in section 5.6.4. Dryer internal limiting values are utilised for:
- Inlet temperature
- Heating temperature
- Vacuum pump
- Function of main valve
- Function of exhaust valve
- Pressure build-up
- Pressure dewpoint
Signals in addition to the above can be arranged by simple means.
