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HDK-MT350_EN_06
Pressure build-up phase
After dehumidification the pressure in the regenerated hollow section vessel is
built up to operating pressure, so that the switchover from regeneration to
adsorption can take place at operating pressure level.
Switchover
When the desiccant in the adsorbing vessel has taken up a sufficient level of
humidity, then the switchover between the vessels will be effected between the
vessels. Following switchover, the above-described process is repeated, with the
adsorption and regeneration now taking place in the respective different vessel.
Standby phase (only with the dewpoint-sensing control)
When in standby phase, the fully regenerated vessel is ready for absorption
operation. The system is switched to this chamber, as soon as the measured
dewpoint at the compressed air outlet has reached the set dewpoint value for
switchover.
Standard equipment
Compressor synchronisation
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, as the dryer can be operated
independently of the compressor.
Dewpoint-sensing control
With the 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 10 minutes). Changeover in the variable cycle depends on the
charge of the desiccant and the dewpoint measured at the dryer outlet as well as
the set changeover value. The adsorption time in the variable cycle is set to max.
60 minutes (see Page ).
Available options
The following options are available for the dryer:
Start-up device
Condensation drain for prefilter
Differential pressure gauge for up- and after-filters
Start-up device (also pressure retention valve)
If the dryer is operated in a depressurised compressed air system excessively
high compressed air flow rates will occur in the dryer. These flow rates can
damage the desiccant and cause increased wear of the dryer components. The
pressure must therefore not be applied or relieved abruptly when starting up and
shutting down the dryer.
