ROTRONIC HygroLog HL20 - Manual (Page 9)

IN-E-HL20-V1_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroLog HL20 and HL21 data logger:
User Guide Instruction Manual
Document Type
Page 9 of 17
Document title
© 2010-2011; Rotronic AG IN-E-HL20-V1_12
● Data recording modes:
Loop
: when the memory is full the logger dumps the oldest data sample and keeps
recording. The memory retains the most recent data.
Start-Stop : the logger stops recording data as soon as the memory is full
Data recording can be stopped at any time by pressing on the function key (long key press) or
with the ROTRONIC HW4 software.
● Recorded parameters:
Depending on the model, the data logger records either temperature only or relative humidity and
temperature. A calculated value such as dew point cannot be recorded by the HL20 but it can be
added to the humidity and temperature data after downloading the recorded data to a PC with the
HW4 software. See the following HW4 manual: E-M-HW4v3-F2-018
● Date and time:
The data logger has an internal real time clock that is used to associate a date and time stamp
with each data record.
When data recording is either started or stopped using the ROTRONIC HW4 software, the real
time clock is automatically synchronized with the PC clock.
● Log file format (data download to a PC with HW4):
The recorded data can be saved as a file to a PC using either HW4 or another communications
software. When using HW4, the file can be either formatted as a text file (extension TXT) or as an
encrypted binary file (extension LOG). The LOG file format can only be read with HW4 and
complies with the FDA / GAMP rules regarding electronic records and electronic signatures.
3. Operation
3.1 Front panel with optional display
Status indicator
(LED)
Function key