Manual

IN-E-HL-NT-V2_12

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroLog HL-NT data logger:

instruction manual

Instruction Manual

Document Type

Page

32 of 48

Document title

IMPORTANT: Using the HW4 software, the display can be set to automatically go blank after a

specific time interval when there is no keypad activity and when there is no communication over

the UART interface. This serves the purpose of conserving battery power. The display comes up

again when any key is pressed or when a communication is initiated. See Software Functions,

Display Sleep function. HW4 is also required to configure the operation of the display backlight:

always off, always on, on key press (default setting).

Keypad

The keypad of the HygroLog HL-NT is comprised of the following keys:

● MENU: press this key to open the function menu, to go back one menu level or to exit the

menu.

● ENTER: this key has two functions:

If the function menu is not open, press this key to switch the display between showing the

measured values, date, time and probe number and showing the measured values and

calculated parameter (if HW4 was used to associate a calculated parameter with the probe).

If the function menu is open, press this key to select a menu item and/or to confirm a value or

setting.

● UP: the up-arrow key has two functions:

If the function menu is not open, the up-arrow key is used to switch the display between the

different probe inputs.

If the function menu is open, the up-arrow key is used to navigate the function menu and/or to

change the setting or value of a menu function.

● DOWN: the down-arrow key has a similar functionality as the up-arrow key:

IMPORTANT: the HW4 software can be used to disable either the MENU key or the entire

keypad. If the keypad does not work, you should check the configuration of the HygroLog HL-NT

with HW4. Disabling the MENU key prevents unauthorized changes to the configuration of the

HygroLog HL-NT and also prevents any probe adjustment. Compliance with FDA / GAMP

requires the MENU key to be disabled.