EN
Installation and operation manual
DRYPOINT
®
M eco control
13
The control software decides in defined cycles on the basis of the measurement results whether, and for how long, the
complete purge air volume must be supplied in order to achieve and stabilise the required degree of drying. This process
will be implemented via a targeted cycling of a solenoid valve. The duration for both subsequent described process steps
therefore varies in every cycle to retain the degree of drying within the specified tolerance range.
Function: Measuring gas flows
A very small partial flow of the dried compressed air
(measuring gas) flows continuously through the internal
duct guide past a temperature and damp sensor (S) to the
measuring gas jet (1). This sensor continuously specifies the
degree of drying for the compressed air in the measuring gas
and notifies the result to the control system.
Function: Purge air flows
The control system continuously compares the measured
degree of drying of the measuring gas with the individual
specified set point value on the DRYPOINT
®
M eco control.
The valve unit will be actuated with deviations: The solenoid
core (2) and piston (3) close the valve seat so that the
compressed air flows through the purge air nozzle (4)
to the membrane dryer. The drying process commences
immediately.
2.4.2. Operating mode
Constant mode (-10 °C; factory-set as default) - Setting for a constant outlet
pressure dew point:
The DRYPOINT
®
M eco control constantly retains the pressure dew point at the outlet b10 and –26 °C in this
operating mode. If the set pressure dew point is <5K (kelvin) below the compressed-air temperature, then the set point
pressure dew point is reduced by one step (maximum. -26 °C). As soon as the minimum difference of 5K is retained, then the
system returns to normal mode.
Dynamic mode - constant difference between compressed air temperature and outlet pressure dew point:
In this operating mode, the pressure dew point is reduced relative to the compressed air temperature by a specified
difference between 10 and 55 K. If the compressed air temperature alters, then the pressure dew point will automatically
follow suit. For programme-technical reasons, an increase in the compressed air temperature is limited to 2 °C/h in order to
reduce short-term alterations in the ambient conditions at the installation and/or assembly location.
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