Sigma 900 MAX Refrigerated Sampler Instrument Manual

Page 15

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