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5.5.2
Dew point Demand (Standard)
Dew Point Demand is a standard feature included with the DRYPOINT XFi dryer in order to provide both performance
monitoring and energy savings.
Dryer outlet dew point is continually read by the BEKO METPOINT SD 21 dew point sensor and transmitted to the
BEKOTOUCH 2 controller. This data is displayed in real time on the HOME screen and also displayed as a trend line in
the GRAPHS & DATA tab on the controller. This allows the user to track possible dew point fluctuations after vessel
switchover or during the drying cycle, for example.
In addition to dew point monitoring, the Dew Point Demand feature serves as a strong and reliable method of reducing
excess energy consumption. Under REGENERATION in the SETTINGS screen of the controller, the user may set a target
outlet dew point not to be exceeded. If at the end of a normal drying cycle the outlet dew point is below this target
value, the dryer will postpone regeneration of the drying vessel and wait until it has reached its moisture capacity (or a
fixed maximum time) relative to the desired outlet dew point. The result is fewer regeneration cycles per day and a
significant energy savings for the user, especially in the case of widely varying airflow demand.
Another capability of the Dew Point Demand feature is the use of a high dew point alarm, which can also be set by the
user on the controller SETTINGS screen.
If for any reason the user wishes to temporarily disable Dew Point Demand control, this feature can be switched OFF.
The system will default back to a fixed time cycle.
5.5.3
Compressor Synchronization (Standard)
The controller has the capability to synchronize the dryer with the compressor when the compressor switches ON and
OFF. Hence, it prevents a situation where the dryer continues to operate and use purge air from the compressed air
network though there is no supply of compressed air. In case the voltage (120V AC-Input) drops at the input, the purge
exhaust valves are immediately closed.
After the compressor signal comes back online, the drying cycle is continued from the same point, meaning that the last
open valve also opens again. Note two exceptions:
This is not valid if the remaining regeneration time is less than 30 seconds, in which case it immediately switches
over to the other drying column, which means the other valve is opened.
If the compressor is switched off for more than 24 hours, then the device is completely restarted.
5.5.4
Regeneration Pipe Insulation (Standard)
Insulation on the regeneration piping is included as a standard feature with the dryer. Fiberglass insulation with
aluminum cladding is installed over the pipework from the heater pipe housing to the regeneration pipe header going
into vessel 'A' and 'B'. This limits heat dissipation off the pipe thus retaining thermal energy for better efficiency.
5.5.5
Tower Insulation (Optional)
Insulation on the vessels is an option with the dryer. This is a fiberglass insulation with aluminum cladding around the
vessels approximately 2/3 of the length. Note that the vessel lower 1/3 is left exposed. This insulation prevents heat
dissipation off the vessel wall thus retaining thermal energy for better efficiency.
5.5.6
Failure to Switch (Standard)
Failure to Switch is a feature provided by monitoring the pressure swing through the dryer sequence. Each dryer's
vessel pressure is monitored continuously by pressure transducers which transmits data directly and continuously to the
BEKOTOUCH 2 controller. A major alarm will be triggered if the controller determines a vessel has not properly
pressurized or depressurized. This major alarm stops the dryer so that further damage does not occur.
DRYPOINT XFi 1000 manual_revA EN
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