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5.2 Dew-point Monitoring
If the dew-point sensor is connected it is possible to monitor the current dew-point. The outlet
dew-point sensor is connected to the PLC controller analogue INPUT I7/A1 (0…10VDC, -
100…+20°C) and enables the PLC to adjust the adsorption time of the adsorption-regulation
cycle in order to reach a set dew-point. The adsorption time is adjusted in such a way that the
desired dew-point is reached with a maximum possible adsorption time. A high adsorption to
regeneration time ratio means that a smaller percentage of dried air has been used for
regeneration resulting in higher efficiency of adsorption dryer system operation.
It is possible to check the current outlet dew-point measurement on the PLC controller display
by moving through the menus to the DEW-POINT SENSOR screen. When in STATUS SCREEN
press ↓ to proceed to the DEW-POINT SENSOR screen. If the sensor is connected then the set
and current dew-point will be displayed. The third line of the screen shows the set dew-point.
The fifth line of the screen shows the current measured dew-point.
Example of DEW-POINT SCREEN
In case of dew-point sensor malfunction, the dew-point rising above the set alarm dew-point
or if the dew-point sensor has been unplugged the DEW-POINT SENSOR OFF status will be
displayed on the DEW-POINT SENSOR screen and alarm/warning output OUTPUT Q6 (Q2 on
the input/output module) will be set to OFF (logical 0).
The alarm dew-point can be set in the SETTINGS menu. →See 5.8 Parameters Settings.
S T A N D - B Y
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