Hach-Lange SIGMATAX2 - Manual (Page 29)

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Section 5 Operation
Figure 16 Display and keypad
1 Time remaining for current process 4 Operational status of heater 
("H" visible = heater active)
7 Go back to previous menu item
2 Current status message 5 Cancel 8 Go to next menu item
3 Operational status of ultrasound 
("U" visible = ultrasound active)
6 Setting change
5.1 Operation
All instrument functions are controlled by the software. The instrument is operated via
menus using four keys that are located below the display. From operational mode, you can
access the first menu level by pressing the function keys, F1 to F4, for 3 seconds.
The functions of the keys in the individual menus may vary, and are therefore shown
(abbreviated clearly) in the second row of the display (softkey function).