User interface and navigationUser interfaceThe keypad has four menu keys and four directional keys as shown in Figure 13.Figure 13 Keypad and front panel overview1 Instrument display 5 BACK key. Moves back one level in the menustructure.2 Cover for secure digital memory card slot 6 MENU key. Moves to the Settings Menu from otherscreens and submenus.3 HOME key. Moves to the Main Measurementscreen from other screens and submenus.7 Directional keys. Used to navigate through themenus, change settings, and increment ordecrement digits.4 ENTER key. Accepts input values, updates, ordisplayed menu options.Inputs and outputs are set up and configured through the front panel using the keypad and displayscreen. This user interface is used to set up and configure inputs and outputs, create log informationand calculated values, and calibrate sensors. The SD interface can be used to save logs and updatesoftware.DisplayFigure 14 shows an example of the main measurement screen with a DO sensor connected to thecontroller.The front panel display screen shows sensor measurement data, calibration and configurationsettings, errors, warnings and other information.22 English