optris CSmicro – E2015-12-A 
29 
 
Self Diagnostic 
 
With this function the current status of the sensor will be indicated by different flash modes of the LED. 
 
 
 
Sensor overheated:    The internal temperature probes have detected an invalid high internal  
        temperature of the CSmicro. 
 
Out of measuring range:  The object temperature is out of measuring range. 
 
Not stable:      The internal temperature probes have detected an unequally internal  
        temperature of the CSmicro. 
 
Alarm fault:      Current through the switching transistor of the open-collector output is too 
        high. 
If activated, the LED will show one out of five possible states of 
the sensor: 
 
Status      LED mode       
 
Normal      intermittent off   -     - - - 
Sensor overheated  fast flash  - - - - - - - - - - - - - 
Out of measuring range  double flash  -- -- -- -- -- -- -- 
Not stable    intermittent on  ––– ––– ––– ––– 
Alarm fault    always on  ––––––––––––––– 
At a supply voltage (Vcc) ≥ 12 V it 
takes about 5 minutes until the sensor 
works in a stable mode. 
Therefore, after switching on the unit, 
the LED will show a not stable state 
for up to 5 minutes.