For externally heat regenerated adsorption dryers, load depending controllers consisting of a PLC coupled to a dewpoint measuring instrument, always makes sense. Modern programmable logic controllers, linked to a moisture measuring instrument, are capable of detecting changing operating conditions, to evaluate these and to process these in the form of reliable signals. Every period of partial loading only of the adsorption dryer is converted into an elongated adsorption period at constant regeneration time. It is the difference between variable adsorption period and constant regeneration period which leads to the saving in regeneration energy. Beyond this, limiting parameters within the dryer are utilised for:
- Heating temperature
- Blower running time
- Main valve functioning
- Exhaust valve functioning
- Pressure build-up
- Pressure dewpoint.
