XDL120 | User Manual
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Data subj ect to change without notice
Bosch Connected Devi ces and Sol utions
3.7
Dos and Don’ts
An inserted SD card is necessary for data logging purpose and configuration of the XDL120. If no SD card is inserted, the
application will show an error indication via the LEDs. To insert the XDK, turn off the device (I/O switch), insert the SD-
Card, and Turn the XDK back on.
CAUTION:
Don't remove the SD card before turning your XDK off. The XDL120 does not detect the SD card removal if the SD-
Card is removed during logging. Logged data could become corrupted.
Do not alter/remove the tags in the config.xml file.
3.8
Known Limitations
Self-heating and compensation of temperature and humidity
As any electronic component, the sensor is subject to self-heating, which can be from the sensor itself, as well as from
other components used at the time of measurement. Unfortunately, this self-heating depends on many factors, e.g.
mounting position of the device and airflow. This results in an increased temperature reading in the raw data. The accuracy
of the humidity measurement is strongly related to the temperature, as relative humidity is calculated using the temperature
reading. Hence, a higher temperature leads to a lower relative humidity.
The XDL120 has a possibility of compensating the self-heating during the conversion of the data. When executing the
datalogger.exe or datalogger.py, the temperature offset can be set as an argument and both temperature and relative
humidity will be compensated accordingly in the output file. As an indication, a self-heating of 2-4 K can be expected. It is
recommended to do a test measurement with a reference thermometer and offset = 0 K, and then compensate the
observed delta accordingly.
