Hach-Lange FILTRAX User Manual - Manual (Page 36)

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Section 5 Operation
5.1 Using the keypad
All functions in the instrument are software-controlled. Operation is via menus
using the four keys below the display. The current sample volumes (1) for the two
filter modules and the operating state of the heating (2) can be seen on the
display during operation. To reach the menu level of the program, one of the four
function keys F1-F4 (3) must be pressed for 3 seconds.
The significance of the keys on the menus appears (sensibly abbreviated) in the
second line on the display (softkey function):
= Cancel
= Change the setting
= Back to the previous command
= Continue to the next command
Fig. 5-25 Display
1. Current sample volume (approx. ml/h) 3. Function keys
2. Operating state of the heating, alternatively:
messages, warnings, faults