Hach SIGMA 900 - Manual (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
rd
blk
blk
shld
wht
1
2
4
7
8
9
10
3
6
5