6
2.2 Installation
Place the chamber on an appropriate support surface such as a bench or
desk. Open the latch by turning the handle counterclockwise until the cam
turns away from the chamber wall and then open the access door. Place
the object(s)to be stored or tested inside the chamber and feed any cables
through the cable pass-through located at the rear of the left panel. Seal
the opening using the supplied pliable sealer.
3.0 PACKAGE
SYSTEMS
Model 5506 Chambers configured as Package D or Package E feature automatic
dehumidification control.
The Model 5311 and 5112 Dehumidification Controllers used in these packages
operate in a similar manner. When the measured humidity exceeds the set point
by more than 0.5% RH (Model 5112), a solid-state control circuit turns on a
solenoid valve or pump. When the valve is activated, dry gas is injected into the
chamber, or the pump is turned on to circulate chamber air through the
desiccator, absorbing moisture and lowering the humidity level and then back
into the chamber. When the humidity level set point is reached, the controller
turns off the valve or pump. The valve or pump then cycles on and off
automatically as required by the controller to maintain the humidity level at the
desired set point.
3.1 Package
D
Many applications require the accurate control of relative humidity at a
specific point below ambient for long-term storage or test applications.
Package D incorporates the Model 5311 Controlled Dry Gas System to
meet these requirements. The controlled solenoid activated valve
regulates the amount of dry gas required to both maintain a dry
environment and conserve the amount of dry gas used in the Model 5506
Chamber.
The Model 5311 is self-contained and comes complete with a controlled
solenoid valve, adjustable flow control valve, universal input voltage 12
VDC power module (90-260 VAC, 50/60 Hz), 5% RH sensor with ½” NPT
compression fitting plus a ¼” NPT quick disconnect fitting for ¼” polyflo
tubing.
The standard sensor supplied with the Dry Gas System has a fixed set
point of 5%. Sensors with other humidity set points are available as an
option. Supplied sensors cannot be reprogrammed to other set points. The
Model 5311 is capable of maintaining the humidity level to better than
±
3%
of the fixed controller set point with a measurement accuracy of ±2% R.H.
