KST – KROMSCHRÖDER SYSTEM TECHNOLOGY
Automatic burner control unit/flame supervision device
The flame supervision device is a component of the automatic burner control unit which complies with EN 298.
Each burner is fitted with its own automatic burner control unit. The pilot flame and main flame are monitored separately on pilot/main burners. An automatic burner control unit for continuous operation is used for 24-hour operation.
The burner flame is monitored by an ionization sensor or a UV sensor. If the flame is monitored by a UV sensor, a UV sensor for continuous operation is used for 24-hour operation.
The function of the flame supervision device is checked cyclically without switching off the burner on automatic burner control units and UV sensors which are suitable for continuous operation. If the device identifies an error during the check, the relevant burner is shut down by the automatic burner control unit with a fault lock-out.
The automatic burner control unit starts the burner and monitors the flame on the burner while the burner is operating. A flame failure results in a fault lock-out of the burner and therefore also in the shutting off of the gas supply to the burner (see EN 746-2:2010 subclause 184.108.40.206.5).
The safety time of the automatic burner control unit depends on the burner capacity or the ignition capacity as described in EN 746-2:2010 subclause 220.127.116.11.4.
Depending on the automatic burner control unit, some input signals must be realized by an additional logic device in the process control system (PCC).
The function must comply with the requirements of the protective system to EN 746-2:2010 subclauses 5.7.2 and 5.7.3.
If failures or disturbances in the protective system can cause a hazardous situation or damage to the machine or product, suitable measures shall be taken to reduce the probability of occurrence of such failures or disturbances. The necessary measures and the extent to which they are implemented – either individually or in combination – depend on the level of risk associated with the application in question.