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8990int.fm Introduction
Section 1 Introduction
1.1 Controller Cover
The controller is mounted on top of a specially designed refrigerator. The
sample line passes through the top of the refrigerator and into the refrigerated
compartment where the sample containter(s) are located. The compartment
is surrounded by rigid foam insulation and utilizes a 120 CFM condenser fan.
An optional controller cover locks and protects the controller from damage
and unauthorized users.
Sample temperature is controlled by an adjustable air sensing thermostat
maintaining samples at 4 °C (39 °F) in ambients up to 50 °C (120 °F). The unit
has a magnetic door seal and does not require rear ventilation. The
refrigerator interior is food grade plastic and the exterior is coated galvanized
steel (304 stainless steel is optional). As a further barrier against corrosion,
the refrigeration components and copper plumbing are treated with phenolic
resin coating.
1.2 Front Panel
The front panel (Figure 1) of the sampler consists of the keypad, liquid crystal
display, and the internal case humidity indicator.
Figure 1 Front Panel
1. Soft Keys 5. Power OFF Key
2. Manual Mode Key 6. Main Menu Key
3. Run/Stop Key 7. Status Bar
4. Power ON Key 8. Menu Bar
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