Hach SIGMA 900 User Manual download pdf (Page 35)

Section 5

Page 35

8544Maintenance.fm Internal Desiccant Module

5.8 Internal Desiccant Module

The Internal Desiccant Module (Cat. No. 787) consists of a

moisture-absorbent material inside a poly bag. If the humidity indicator on the

front panel turns pink, replace the module and the back panel perimeter

gasket. The desiccant module is located under the CPU board.

Note: The desiccant module cannot be recharged by heating. Do not attempt to

bake

the desiccant module in an oven to remove the moisture as this could be a

fire hazard.

5.9 Circuit Board Identification

Figure 10 shows the 900 Composite Sampler circuit board, including:

• Placement of all connectors

• EPROM location

• Lithium Memory Battery

• Desiccant Module installation

Figure 10 Circuit Board Description

900 Main Circuit Board

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Hach SIGMA 900 User Manual Page 35