Specifications

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2.2.1 Desiccant/Pump Dehumidification System
The Model 561 Dehumidification System is a closed loop system, designed to
reduce the relative humidity in the Model 518 Chamber to less than 10% RH.
When paired with the Model 518 Microprocessor Humidity Controller, the humidity
inside the chamber can be controlled to within +/- 0.2% RH of the set-point at the
sensor.
2.2.1.1 Description
The Model 561 Dehumidification System includes a small air pump
(located inside the Chamber control cavity), 1.0 lb. of indicating calcium
sulfate (CASO
4
) in a clear plastic column (located outside the chamber),
and 5/16” I.D. tubing to interface the drying column with the pump. The
tubing connects to the chamber through the quick-connect fittings on the
right side of the Chamber. The desiccant column may be placed on top
of, or next to, the Chamber.
The air pump is internally connected to the humidity controller. All the
user needs to do is connect the desiccant column into the system using
the provided 5/16” ID Tubing.
The desiccant removes moisture from the air. This dried air is then forced
back into the chamber working space. The desiccant contains an indicator
that turns the normally blue colored desiccant pink as it absorbs moisture.
When the cylinder is mostly pink, the desiccant should be renewed or
replaced.
A 2.5 lb. desiccant column is available as an option or multiple 1 lb
columns can be connected in series. This will extend the time between
desiccant changes, but will reduce the air flow, thereby increasing the
drying time.
2.2.1.2 Unit Specifications
1. Average air flow rate is 0.67 cfm (19 lpm).
2. Air is dried to a dewpoint of -100°F.
3. Capacity for water vapor is up to 100 grams.
4. Power – 115 VAC/60 Hz, 1.1 Amps
230 VAC/50 Hz, 0.6 Amps
5. Desiccant Column is safe for working pressures up to 90 psig.