8
Figure 3.1-2: Control/Solenoid/Flow Regulator unit
The Control Unit is designed as a complete assembly. There are no
user controls except the flow regulator adjust knob. The only
indicator is a Green LED that indicates the solenoid is on and
supplying gas to the chamber.
3.1.2 System
Function
The Humidity Sensor measures the relative humidity inside the
chamber. If the humidity measured in the chamber exceeds 7% RH
the solenoid valve is powered and dry gas is injected. When the
humidity inside the chamber drops to 4% RH the solenoid valve is
deactivated, shutting off the flow of dry gas. The valve will then
cycle on and off automatically as required by the Controller to
maintain the specified humidity level.
A 12V DC universal power module is used to power the Model
5311. It operates from 90-260 VAC, 50/60 Hz. For international
applications the user will have to provide the appropriate adapter
plug to convert the standard North American 2-prong plug to mate
with the available power (MAINS) outlet.
3.1.3 Installation
3.1.3.1 Initial Check Out
Inspect the Control unit and Sensor and inspect for any
visible damage. If no damage is observed then check out the
system as follows:
1. The Humidity Sensor is pre-wired to the control unit when
shipped.
2. Plug the low voltage connector from the power module
into the power jack located on the bottom of the Control
