Download Directed Electronics 554A Specifications

The minimum cycle time for the ETS Model 562 is 1.0 second.
3.2.3 Dehumidification System
The Dehumidification System air pump is located inside the Chamber control
cavity. The desiccant column is attached externally through the fittings labeled
‘AIR IN’ and ‘AIR OUT’ on the ‘Side Interface Panel’.
To operate the Model 518 Dehumidification System:
1. Read the operating instructions for the Dehumidification System being used.
2. Adjust the set-point to a value below the ambient RH conditions.
3. Turn on the “RH” STANDBY switch on the front of the Model 518 control
panel.
This will not automatically apply power to the dehumidification system.
Turning on the “RH” STANDBY switch only makes the dehumidification
system available to the microprocessor controller.
When the controller activates the outlet, the small red LED in the lower right
corner of the RH display will illuminate.
4. The microprocessor will determine the amount of dehumidification needed to
maintain the desired set-point in the enclosure.
If less than the full output capacity of the dehumidification system is needed,
the controller will provide pulses of power to the unit to limit the output. The
dehumidification system will be turned on and off cyclically to obtain an
average output lower than the full capacity of the dehumidification system,
appropriate to maintain the desired set-point in the chamber.
For best results, the Cycle Time 2 (CyC.2) should be set as short as possible.
See the Dehumidification System instructions for cycle time
recommendations.
ETS Model 561 minimum cycle time is 2.0 seconds.
ETS Model 578 minimum cycle time is 5.0 seconds.
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