138  AO2000 CONTINUOUS GAS ANALYZERS  |  OI/AO2000-EN REV. B 
 
 
 
Gas analyzer operation 
 
 
Display and control unit 
Overview 
Error Maint Power
7
89
6
54
12
3
0
.
Status LED’
Numeric 
Keypad
Menu Line
Information
Field
Softkey Line
creen with
Softkeys Cancel Keys
 
The display and control unit contains: 
•  The screen (see page 139) with 
•  Menu line, 
•  Information field, 
•  Softkey line, 
•  Status LEDs (see page 141), 
•  Numeric keypad (see page 142), 
•  Cancel keys (see page 143) and 
•  Softkeys (see page 144). 
In both system housing versions the display and control unit is located on 
the front face. 
Display and control unit operating modes 
The display and control unit operating modes are 
•  Measurement and 
•  Menu. 
The display and control unit operating modes have no effect on measure-
ment operations, i.e. gas analyzer measurement functions continue while in 
menu mode.