Hach SIGMA 900 - Manual (Page 8)

Page 8
Front Panel 8544intro.fm
Section 2
Figure 1 Interface Connectors
2.3 Front Panel
The front panel consists of the keypad, liquid crystal display, and the internal
case humidity indicator (
Figure 2 ).
2.3.1 Keypad and Display
The sampler controller is equipped with a 24 character alphanumeric liquid
crystal display which automatically steps the user through the program
settings.
2.3.2 Humidity Indicator
The internal case humidity indicator (Cat. No. 2660) turns pink when the
internal case humidity exceeds 60 percent.
The sampler is equipped with an internal desiccant module (Cat. No. 8849) to
absorb any humidity trapped in the case during final assembly. Under normal
operating conditions, this desiccant provides long-term protection against
condensed moisture inside the case.
Replacement of the internal desiccant module is only necessary if the
indicator turns pink. See to
section 5.8 on page 35 for details.
1. 12 V
dc
2. Auxiliary
1
2