lm_sensors is a console tool, called by another app
you need to open konsole and write su and enter
then write your root password
now you can configure lm_sensors, write sensors-detect and press enter
answer the questions done by the app and hopefully you will have all your sensor reporting values properly
while as root in konsole write exit and press enter
now write sensors and press enter, those are your sensor values
some superkaramba monitors can use this values, other apps too(some plasmoiuds maybe)