Hach 900 manual Section Internal Desiccant Module, Circuit Board Identification

Section 5

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.

5.9Circuit 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

10

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1

900 Main Circuit Board

blk shld wht

rd blk

2

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8544Maintenance.fm	Internal Desiccant Module