Siemens LGK16.122A17 110v Gas Burner Control

The flame supervision circuit initiates the safety actions in the case of... :

 ... premature or missing flame signal 

... any kind of fault on the flame detector, the detector cables or the flame signal amplifier that could simulate a flame signal during burner operation The burner controls are therefore suited for use in all types of oil- or gas-fired combustion plant where self-checking flame supervision systems are either mandatory or recommended.

For example: 

Burners that operate continuously 

Burners in intermittent operation that, in the case of great heat demand, may operate continuously for more than 14 hours, e.g. in plant using boiler sequencing Burners that need to comply with the German TRD 411 and TRD 412 regulations for steam boilers

Burners in plant where, for specific safety requirements, supervision of the burner by a self-checking flame supervision system seems advisable 

The control sequence and connection circuitry of the LOK16/LGK16 burner controls are identical to those of the LAL2 and LFL1 respectively (with the exception of the LFL1.148), so that existing combustion plant can also be equipped with self-checking burner controls,- provided very good flame detector current values are measured in the plant  supervised so far by the LFL1, and- provided the following types of flame detectors are either installed or can  subsequently be fitted: