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
31 of 48
Document title
© 2009-2012; Rotronic AG IN-E-HL-NT-V2_12
If the HygroLog HL-NT has a display and keypad, disable the MENU key (see HW4 manual -
Device Manager - HygroLog HL-NT - Keypad).
7. Getting started
Insert a 9V alkaline battery in the HygroLog HL-NT as explained under Hardware Description -
Power. To conserve battery power, models with a display are shipped with the Display
Sleep function enabled. With this function enabled and when logging is not active, the logger
just keeps track of the date and time and uses very little battery power. Press any key on the
keypad to temporarily suspend the Display Sleep function. The HW4 software is required to either
disable the Display Sleep function or to reconfigure this function. See Display Sleep function
under Software Functions
8. Stand-alone operation
8.1 Operating modes
The HygroLog HL-NT has two main operating modes: measure and record.
● Measure mode: the HygroLog HL-NT defaults to this mode when it is not recording any data.
What happens in this mode depends on whether or not the HygroLog HL-NT is communicating
with a PC.
When there is no communication with a PC, the model without display is in a low power
consumption mode and just keeps track of the date and time. The model with display behaves
differently, depending on whether or not the Display Sleep function is enabled (see Software
Functions). If the function is disabled (display always on), measurements take place at
intervals of time corresponding to the display refresh interval that was specified with HW4
when configuring the data logger. When the display goes blank because the Display Sleep
function is enabled, the model with display behaves in the same manner as the model without
display.
● Record mode: the model without display measures data according to the log interval that was
specified for each individual input. The shortest log interval is 5 seconds. The log interval and
the measurement interval are the same. In the case of the model with display, the
measurement interval is the shortest of the log interval and display refresh interval. If the
Display Sleep function is active, the measurement interval is by default the same as the log
interval.
8.2 Display and keypad
Depending on the model, the HygroLog HL-NT is equipped with a display and a keypad.
Display
The HygroLog HL-NT uses a monochrome graphic LC display with backlight. The backlight works
only when the HygroLog HL-NT is powered via a docking station. The normal function of the
display is to show the most recent measured values, one at a time. The display is also used to
navigate the Function Menu of the HygroLog HL-NT.