Monitoring a flame treatment device

A substrate treatment system comprising:

• a flame treatment device for flame treating substrates, comprising a flame zone;
• a transport device for transporting a substrate carrier with substrates through the flame treatment device;
• a first substrate monitoring unit, which is suited to monitor the movement of the substrate carrier through the flame treatment device with respect to its transport speed and/or its dwell time in the flame zone;
• a second substrate monitoring unit, which is suited to monitor the substrates in the substrate carrier with respect to their temperature after they exit the flame zone;
• and
• a control unit,
• which is suited to switch off the flame treatment device when the first substrate monitoring unit detects too low a transport speed and/or too long a dwell time of a substrate carrier in the flame zone, and
• which is suited to stop the transport of the substrate carriers through the flame treatment device when the second substrate monitoring unit detects that the temperature of a substrate is too high.