Technical product description
A190-930TX_EN_03_ 2009-02-06
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Filters in the bypass line are meaningful so that the actual loads are largely
protected against dirt, water, and oil droplets even whilst maintenance is in
progress.
Signalling contacts of the control system
The control system is equipped with a digital input for the synchronised operation
with a compressor. This feature allows for synchronised and thus efficient dryer
operation with discontinuous compressor operation.
The control system can also be equipped with an optional operation signalling
contact with which the dryer operation can be monitored from an external device.
Dryers with the optional
dewpoint-sensing control
are equipped with such a
contact as standard. It is used for the transmission of operating signals and for
the output of dewpoint alarms.
Compressor synchronisation
Compressor synchronisation helps reduce energy costs, as the dryer can be
operated independently of the compressor.
When the compressor is switched off, the regeneration gas return ensures that
regeneration is continued, as soon as a certain compressed air volume is
reached behind the dryer. The regeneration process must be continued and
ended so that the drying agent does not become unusable prematurely.
The compressor synchronisation controller is a higher-level controller than the
pressure dew point controller (see below). When both options are in place, the
compressor synchronisation controller is treated as the prime controller.
Dewpoint-sensing control
With a dewpoint-sensing control system, you can operate the dryer in fixed or
variable cycles. In the fixed cycle, switchover is effected after a fixed time period
(usually after 5 minutes). In the variable cycle, the switchover is effected in
relation to the dew point reached and the charging of the drying agent . The
adsorption time in the variable cycle amounts to 60 minutes maximum.
Pneumatic control
A pneumatic control system can be used wherever an alternative to the electronic
control system is required, such as e.g. in explosion hazard areas.
Paint compatible design
Paint shop plants impose particularly stringent requirements with regard to the
cleanliness of the compressed air, as already the minutest contaminations can
reduce the quality of the paint finish. Even minute quantities of oil and grease
containing foreign materials or solvents — above all silicones — are sufficient to
cause pits, discolorations, swellings, and other contaminations in the paint finish.
Dryers in a paint compatible design comprise seals and filters that are absolutely
free of grease and silicon and thus ensure a high quality of the compressed air
used for painting.