9
unit. Then plug the power module into the appropriate
power outlet (MAINS). This will automatically power up
the Control unit. There is no power ON/OFF switch.
3. Wait 3 minutes and check the Green LED mounted on
top of the unit. If the ambient humidity is above the fixed
set point the solenoid will be activated and the LED
should light.
3.1.3.2 Installation
The sensor mounts in the ½” NPT compression fitting
installed on the left chamber wall.
CAUTION:
The sensing element is sealed within the sensor
assembly, protected against mechanical damage by a
slotted housing cover. Under no circumstances should
the sensing element be touched. The sensor should
never be cleaned using compressed air. Dust and dirt
particles can be removed by blowing gently. There are
no user serviceable parts in the Model 5311 sensor.
The Control Unit may be installed either directly onto the
chamber wall using the fitted 2” (5cm) long, ¼” NPT
threaded tube with ¼” NPT nylon adapter or located
remotely and connected to the chamber using the ¼” polyflo
tubing and the quick disconnect fitting supplied. A small relief
hole is required to prevent pressure build-up in the chamber.
The extra quick disconnect is used for this application.
3.1.3.3 Dry Gas Requirements
Typical dry gases are nitrogen, CO
2
and dry air. Usually
these gases are under high pressure at the source. An
appropriate pressure reducer should be installed between
the source and the Dry Gas Control System.
