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
9 of 48
Document title
© 2009-2012; Rotronic AG IN-E-HL-NT-V2_12
Note: the consumption of the display is negligible when the Display Sleep function is enabled.
With the display always on, power consumption is at its highest when the display refresh rate is
set with HW4 to the minimum of 5 sec.
Because of the requirement to keep track of the date and time, the HygroLog HL-NT does not
have a power on/off switch. Every minute, both the date and time are recorded to the internal
EEPROM. Seconds are not recorded. In the event of a relatively brief interruption of power (such
as when replacing the battery), time may fall behind in increments of one minute. Removing the
battery for an extended period of time will cause the logger to completely lose track of the date
and time.
2.4.2 Battery replacement
2.5 Memory card
The HygroLog HL-NT has a non-volatile 64 kb EEPROM internal memory that is used to save the
logger configuration data, the logger events and to temporarily hold measurement data.
The main memory is a plug-in flash memory card. As a standard, the HygroLog HL-NT ships with
a 16 MB card. This card allows the recording of up to 400,000 values in text file format
(unprotected) or up to 750,000 values in binary file format (protected). Memory cards with a
capacity of up to 1 GB can be purchased from third parties. Regardless of its size, the flash
memory card holds a maximum of 512 files and directories, including one logger-configuration
and one logger-event file.
The measurement data can be saved either to a file with extension XLS or to a file with extension
LOG. Files with XLS extension can be read with Notepad or imported into Microsoft Excel. Files
with extension LOG are encoded in binary format so as to prevent data manipulation and can
only be read with the ROTRONIC HW4 software. Both types of files can co-exist on the memory
card. The memory card can be removed from the logger and transferred to a card reader, a PDA,
etc. The flash memory card can also be read without being removed from the logger.
cover
To access the battery,
remove the screw shown
to the right and open the
rubber cover.
The battery is located at
the bottom of the
instrument.
Probe
input 5
battery